Engineering Calculators Online

Perform precise technical calculations with ease. From electrical and mechanical to structural engineering — our calculators help engineers and students save time and avoid errors.

T Matching Network

This calculator determines the component values for a T-network impedance matching circuit, typically used in RF and antenna design to match a source impedance to a load impedance using two series reactances and one shunt reactance.

Zener Diode Resistor

This calculator determines the ideal series resistor value for a Zener diode voltage regulator based on input voltage, Zener voltage, and current requirements. It’s useful for designing simple voltage stabilization circuits.

Stripline PCB Differential Impedance

This calculator estimates the differential impedance of a stripline pair based on trace impedance, spacing, and dielectric height. It’s crucial for differential signal design in high-speed multilayer PCBs such as USB, HDMI, and PCIe.

Young’s Modulus Spring Resonant Frequency

This calculator estimates the resonant frequency of a spring using geometric parameters, material density, and modulus of rigidity (G). It is ideal for evaluating coil spring dynamics in precision mechanical, automotive, and vibration systems.

Stripline Impedance

This calculator estimates the characteristic impedance of a stripline trace embedded between two ground planes on a PCB. It uses the trace width, thickness, dielectric constant, and spacing to help engineers design impedance-controlled circuits.

Wire Gauge

This calculator converts wire diameter into the corresponding American Wire Gauge (AWG) size. It’s useful for electrical engineers, hobbyists, and technicians who need to identify or select wire sizes based on diameter.

Straight Wire Inductance

This calculator estimates the inductance of a straight round wire based on its length and diameter. It is useful in RF design, antenna modeling, and low-frequency inductive analysis where conductor shape affects circuit behavior.

Spring Mass

This calculator estimates the mass of a spring based on its material density and volume. It is useful in mechanical design and vibration analysis where spring weight affects system dynamics.

Spring Resonant Frequency

This calculator determines the resonant frequency of a mass-spring system based on the mass and spring constant. It’s essential for analyzing mechanical vibrations, oscillations, and tuning dynamic systems in engineering and physics.

Specific Work of Gas Turbine

This calculator determines the net specific work output of a gas turbine by subtracting the compressor work from the turbine work. It is essential for analyzing turbine efficiency, energy output, and thermodynamic performance in jet engines and power generation systems.

Specific Work

This calculator determines the specific work done during compression or expansion processes, based on fluid density and pressure difference. It’s useful in thermodynamics, fluid mechanics, and energy system analysis.

Quality Factor in Optical Systems

This calculator determines the optical quality factor (Q-factor) of resonant systems, such as optical cavities or waveguides, using the resonant frequency and bandwidth. It’s essential for evaluating energy retention and sharpness of resonance in photonics, lasers, and telecommunications.

Physical Properties of Coil

This calculator determines key physical characteristics of a coil, such as total wire length, weight, resistance, and turns per unit length, based on wire diameter, coil dimensions, and material type. It’s useful for coil winding, transformer design, and inductive component prototyping.

PI Network Impedance Matching

This calculator helps design a PI matching network to match a source impedance (Rs) with a higher load impedance (Rl). It calculates the quality factor and reactance values required for impedance transformation using capacitive and inductive elements.

PCB Microstrip Crosstalk

This calculator estimates the crosstalk between parallel microstrip traces on a PCB using spacing and height parameters. It outputs the result in decibels (dB) to assess signal interference in high-speed circuit designs.

Microstrip PCB Impedance

This calculator determines the characteristic impedance of a microstrip trace on a PCB based on its width, substrate height, and dielectric constant. It is crucial for maintaining signal integrity in high-speed digital and RF PCB designs.

Parallel Wire Impedance

This calculator determines the characteristic impedance of a parallel wire transmission line based on conductor diameter, spacing, and dielectric constant. It’s essential for designing balanced RF lines like twin-lead cables, antennas, and low-loss feeders.

Parallel Resistance

This calculator determines the total resistance of multiple resistors connected in parallel. It’s useful in electrical and electronic circuit design to reduce resistance, distribute current, or achieve specific resistance values.

Parallel Inductance

This calculator computes the total inductance of multiple inductors connected in parallel. It’s useful in circuit design where lower overall inductance is needed by combining individual coils.

Speaker Sound Q

This calculator determines the total quality factor (Q) of a speaker based on its electrical and mechanical properties. It’s commonly used in speaker enclosure design to assess how a driver responds near its resonant frequency, affecting bass response and system damping.

Solenoid Coil Electromagnetic Force

This calculator estimates the electromagnetic force (EMF) produced by a solenoid coil based on the number of turns, current, core material, and solenoid dimensions. It’s ideal for designing actuators, relays, valves, and magnetic lifting devices.

Single Phase Transformer

This calculator helps determine the primary and secondary voltage or current in a single-phase transformer based on turns ratio, input/output parameters, and power rating. It’s useful for power engineers, electricians, and students working with AC power systems.

Series Inductance

This calculator determines the total inductance of inductors connected in series. It’s useful in circuit design, filter creation, and power electronics where inductive components are combined to achieve a specific total value.

RF Power Density

This calculator estimates the power density (W/m²) of a radio frequency (RF) source based on its transmitted power and distance from the source. It’s useful for assessing radiation exposure, designing antennas, and ensuring compliance with safety standards.

Real and Reactive Power

This calculator computes real power (kW), reactive power (kVAR), and apparent power (kVA) based on voltage, current, and power factor. It’s useful in electrical engineering for analyzing power flow, correcting power factor, and designing efficient AC systems.

R1 R2

This calculator computes the individual resistances R1 and R2 based on the measured values of external earth impedance Z_e and total system impedance Z_s. It’s commonly used in electrical safety testing and circuit protection design.

mA/h Power Consumption

This calculator estimates the total energy usage of a device in milliamp-hours (mAh) by multiplying its current draw (mA) by the number of hours it operates. It’s helpful for evaluating battery life and designing energy-efficient systems.

Inverse Discrete Fourier Transform

This calculator performs the Inverse Discrete Fourier Transform (IDFT) to convert a set of frequency domain components back into a discrete time-domain signal. It’s useful in signal processing, digital communication, and audio engineering applications.

Number of Turns in Transformer Coil

This calculator helps determine the number of turns required in the primary or secondary winding of a transformer based on input voltage, output voltage, core cross-sectional area, and frequency. It’s essential for transformer design in power supplies, audio, and high-frequency applications.

NE555 Timer Astable Circuit

This calculator helps design an astable multivibrator circuit using the NE555 timer IC by calculating the output frequency, time period, and duty cycle from resistor and capacitor values. It’s ideal for creating clocks, blinkers, tone generators, and pulse-width modulated signals.

Helical Antenna

This calculator helps determine the key design parameters of a helical antenna, including its total length, number of turns, spacing, and gain based on frequency and diameter. It’s commonly used in satellite communication, aerospace, and radio telemetry.

Nichrome Wire

This calculator estimates the resistance, power, and current of a nichrome wire based on its length, diameter, and operating voltage. It’s widely used in heating element design, such as for toasters, 3D printer hotends, and DIY heating coils.

IC 555 Astable Timer

This calculator helps determine the output frequency, period, and duty cycle of an astable multivibrator using a 555 timer IC. It’s widely used in electronics for creating oscillators, blinkers, clocks, and PWM signals.

Microstrip Transmission Lines Impedance

This calculator estimates the characteristic impedance of microstrip transmission lines based on trace width, substrate height, and dielectric constant. It’s essential for designing high-speed PCBs and RF circuits where impedance matching is critical.

Microstrip Differential Impedance

This calculator estimates the differential impedance of a pair of microstrip traces on a PCB, based on trace width, spacing, dielectric constant, and substrate height. It’s essential for designing high-speed differential signal lines like USB, HDMI, and LVDS.

Microstrip Impedance From Zo

This calculator determines the required microstrip trace width or substrate height based on a desired characteristic impedance (Zo), dielectric constant, and board thickness. It’s essential for impedance-controlled PCB layout in RF and high-speed digital design.

Microstrip Impedance

This calculator determines the characteristic impedance of a microstrip transmission line based on trace width, substrate height, and dielectric constant. It’s essential for RF PCB design, signal integrity, and impedance-controlled routing.

mA/h Power Consumption

This calculator estimates the power consumption of a device in milliamp-hours (mAh) based on the current draw and usage time. It’s helpful for battery life analysis, device power budgeting, and designing energy-efficient electronics.

LM317 Current Regulator

This calculator determines the output current of an LM317 constant current regulator circuit using a single resistor. It’s useful for LED drivers, battery chargers, and current-limited power supplies where a stable current is required.

LM317 Voltage and Resistor

This calculator helps you determine the output voltage or required resistor values for the LM317 adjustable voltage regulator. Ideal for electronics engineers and DIY hobbyists working with power supply design, battery chargers, or custom voltage outputs.

KVA to Amps

This calculator converts kilovolt-amperes (kVA) to amperes (A) based on voltage and the number of phases. It’s useful for electrical engineers, technicians, and installers when sizing equipment, designing power systems, or configuring generators and transformers.

LED Series Resistor

This calculator helps you determine the correct resistor value needed in series with an LED to limit the current and prevent damage. It’s useful for electronics hobbyists, circuit designers, and engineers when building safe and reliable LED circuits.

Grounding Strap Inductance

This tool calculates the inductance of a flat grounding strap based on its length, width, and thickness. It’s useful in electrical grounding and EMC design, helping engineers reduce impedance and improve current return paths in high-frequency applications.

L Matching Network

This tool calculates the component values for an L-type impedance matching network, used to match source and load impedances in RF circuits. It's especially useful for antenna design, amplifier interfaces, and filter design to ensure maximum power transfer and minimal signal reflection.

90 Degree Mitered Corner

This tool helps you calculate the mitered length of a 90-degree bend in electrical conduit or pipe, factoring in bend height and elbow width. It’s essential for electricians and engineers to ensure precise layout and minimal material waste during conduit installations.

Rafter Length

This calculator helps you find the length of a rafter using either the roof angle or the pitch. Just input the vertical rise, roof run, and angle or pitch value to compute the accurate rafter length for roof framing — ideal for carpenters, roofers, and structural engineers.

Number of Paving Stones

This calculator helps estimate the number of paving stones needed to cover a defined area, with an optional 10% allowance for wastage. By entering the total surface dimensions and the size of a single paving stone, you get both the required quantity and a recommended amount to purchase.

Number of Concrete Blocks

This calculator helps you estimate the number of concrete blocks required to build a wall or surface. Just enter the total wall dimensions and the size of a single block — the tool does the rest. Ideal for builders, contractors, and DIYers during project planning.

Maximum Floor Live Load Capacity

This calculator estimates the maximum live load a floor can support without excessive deflection or failure. It is based on span, stiffness, modulus of elasticity, and a correction factor. Engineers and architects use it to assess floor safety under dynamic loads like people, furniture, or equipment.

Floor Tile Estimator

This calculator helps you determine the exact number of tiles required to cover both the floor and skirting (wall border) of a room. By inputting the room dimensions, tile size, skirting height, and tile wastage percentage, you can plan purchases accurately and avoid material shortages or waste.

Floor Space Index (FSI)

This calculator helps you determine the Floor Space Index (FSI), also known as the Floor Area Ratio (FAR). FSI is the ratio of a building's total covered area to the plot (land) area. It’s an essential tool for architects, civil engineers, and planners working on zoning, construction limits, and urban development regulations.

Elevation Point of Vertical Curve

This calculator determines the elevation at any point along a vertical parabolic curve. By entering the elevation of the PVC, the initial and final grades, the distance xx from the PVC, and the curve length, you can precisely compute the elevation at that location. Ideal for roadway and railway design.

Earthwork Cross Sectional Area

This calculator determines the cross-sectional area of land used for earthwork by inputting the X and Y coordinates of each point outlining the cross-section. It is useful for surveyors and civil engineers working on excavation, road construction, or grading.

Earthwork Cross Section Volume

This calculator estimates the volume of earthwork based on the average of two cross-sectional areas and the length between them. It’s commonly used in civil engineering and roadwork projects to determine how much soil needs to be cut or filled.

Curb and Gutter Barrier Concrete Yardage

This calculator estimates the volume of concrete in cubic yards required for a curb and gutter barrier. By entering the length, face width, gutter width, and curb height (in inches), you can accurately determine how much concrete is needed for construction.

Cubic Yards of Triangular Stepping Stones

This calculator estimates the volume in cubic yards of a triangular-shaped stepping stone using its base, height, and thickness. Enter your dimensions in inches to get an accurate concrete requirement — great for landscaping paths with geometric patterns.

Cubic Yards of Rectangular Stepping Stones

Use this calculator to determine the volume in cubic yards of a rectangular stepping stone. Enter the length, breadth, and height (in inches) to calculate the volume of concrete needed for a single unit — ideal for pathways, patios, and landscaping elements.

Cubic Yards of Circular Stepping Stones

This calculator estimates the volume in cubic yards of a circular stepping stone based on its radius and height. Use it to determine the concrete needed per unit or for multiple pieces — ideal for landscape designers and DIYers working with round pavers.

Concrete Yardage

This calculator estimates the total concrete yardage needed for a pour, using dimensions in feet and inches. Enter length and width in feet, height in inches — and instantly get the concrete volume in cubic yards. Ideal for slabs, footings, walls, or general pours.

Concrete Wall

This calculator estimates the concrete volume in cubic yards required to build a wall. Just enter the wall’s length, height, and thickness (in inches), and get an accurate concrete yardage — perfect for construction planning and concrete ordering.

Concrete Volume

This calculator helps you estimate the total volume of concrete needed to fill cylindrical forms such as piers, columns, or pipes. Input the radius, depth, and quantity to calculate the total concrete in cubic yards.

Concrete Stairs

Use this calculator to estimate the volume of concrete required for building stairs. By entering the number of steps, rise, tread, and width, you can quickly determine how much concrete is needed for casting staircases, helping with both planning and budgeting.

Concrete Slab Pour Volume

This calculator estimates the volume of concrete needed to pour a rectangular slab. Just enter the width, length, and thickness to get the required amount of concrete in cubic feet or meters, depending on units used.

Concrete Slab Maximum Wall Load

This calculator determines the maximum load a concrete slab can support when subjected to wall loads. Based on compressive strength, slab thickness, and a stiffness coefficient, it is essential for ensuring safe and efficient structural designs in residential, commercial, or industrial projects.

Concrete Slab Maximum Length

This calculator determines the maximum allowable length of a concrete slab based on the reinforcement ratio, steel stress, and slab spacing. It helps engineers and contractors design slabs that are structurally sound and resistant to cracking or failure.

Concrete Mix Ratio

This calculator estimates the required quantities of cement, sharp sand, gravel, and water for a concrete mix based on the volume of the slab or structure. Just enter the width, height, and depth to get instant material requirements using standard mix ratio coefficients.

Concrete Footing Yard

This calculator helps you estimate the volume of concrete needed in cubic yards for a footing using dimensions in inches. Enter the length, width, and height to determine the total concrete yardage — ideal for quick on-site calculations.

Concrete Ingredients

This calculator estimates the volume of each ingredient—cement, sand, and aggregate—based on the concrete mix ratio and the total required volume. Just input the structure’s dimensions and your preferred mix proportion to get accurate material quantities.

Concrete Footing/Slab Pours

This calculator helps determine how much concrete is required for a footing or slab pour based on diameter, width, and depth. It converts all measurements to cubic yards, giving accurate estimations for small or large pours in foundation or floor construction.

Concrete Footing Yardage

Use this calculator to estimate the volume of concrete in cubic yards for a footing, using input dimensions in inches. Ideal for contractors needing fast conversion from inch-based plans to concrete volumes for purchasing and delivery.

Concrete Footing Volume

This calculator helps determine the volume of concrete needed for rectangular footings, including cases with inner voids. Simply enter the outer and inner dimensions along with the thickness to get the total concrete volume required for the footer.

Concrete Column Fill

Use this calculator to estimate the volume of concrete required to fill a round column. Enter the diameter and height to compute the result in cubic yards. This is helpful for contractors and civil engineers when planning column footings or vertical structures.

Cement and Sand for Plastering

Quickly estimate the quantity of cement and sand needed for plastering any wall or surface. Input area, thickness, and mix ratio for instant results.

Cantilever Beam with Uniform Load

This calculator estimates the deflection of a cantilever beam with a uniform load distribution. Includes real-time stiffness and material-based analysis.

Cantilever Beam with Load at Free End

Easily determine deflection and slope when a cantilever beam is loaded at its free end. Common in balcony design and mechanical arm analysis.

Cantilever Beam with Load at Any Point

Find the slope and deflection of a cantilever beam loaded at an arbitrary point. Useful for irregular load cases in real-world structural applications.

Cantilever Beam with Distributed Load

This tool calculates the slope and deflection at any point on a cantilever beam with a uniformly distributed load. Ideal for structural engineers designing load-bearing elements.

Cantilever Beam with Couple Moment

Calculate the slope at the free end and deflection at any section of a cantilever beam subjected to a couple moment. Ideal for structural analysis and educational purposes in civil and mechanical engineering.

Cantilever Beam Stiffness

This calculator helps determine the stiffness of a cantilever beam based on its material and geometric properties. It is useful for structural engineers, civil engineers, and students to evaluate how much resistance a beam offers against deflection when a load is applied at its free end.

Three-Phase Power by Two Wattmeters

This calculator estimates the total active power in a three-phase system using the two-wattmeter method. It’s commonly used for both balanced and unbalanced load systems in electrical engineering. You can input line voltages, line currents, and the phase angle between voltage and current.

Horsepower to Watts Converter

This converter allows you to easily convert between horsepower (HP) and watts (W), two common units of power used in mechanical and electrical engineering. Choose the direction of conversion and input the known value to get the result instantly.

Air Core Coil Inductance

This calculator determines the inductance of an air core flat spiral coil based on its number of turns, inner and outer diameters. It’s commonly used in radio-frequency and PCB applications where coreless coils are required. It supports both imperial and metric units.

555 Timer

This 555 Timer calculator helps you determine the output pulse duration or time delay in monostable mode based on resistor (R) and capacitor (C) values. It’s useful for electronics students, hobbyists, and engineers working with timing circuits.

Pipeline Flow Rate

This calculator estimates the flow rate of fluid in a pipeline based on pipe diameter, slope, surface roughness, and kinematic viscosity. It is ideal for civil, hydraulic, and mechanical engineers involved in water supply, sewage, or industrial fluid transport systems.

Instantaneous Water Heater

This calculator helps you determine the required power of an instantaneous water heater or estimate the achievable water flow or temperature based on the heater’s power. It’s useful for engineers, plumbers, and homeowners planning water heating systems. Just input the desired temperature, cold water inlet temperature, and power or flow rate — and get instant results.

Railroad Curve Degree

This calculator helps determine the degree of curvature for railroads based on the curve radius. It’s a key parameter in railway design and alignment, ensuring safe and smooth train movement through curves.

Asphalt Density

This calculator determines the density of asphalt using core sample weights measured in water and air. It’s used in road construction quality control to assess compaction levels and ensure material performance.

Crest Vertical Curve Length

This calculator estimates the minimum required length of a crest vertical curve on roads to ensure sufficient sight distance for safe vehicle operation. It helps highway designers evaluate visibility constraints and alignments based on grades, stopping sight distance, and driver eye/obstruction height.

Cornering Force

This calculator estimates the lateral cornering force acting on a vehicle during a turn, accounting for road slope, mass, friction, and radius of the curve. It also calculates the maximum safe velocity to prevent skidding. Ideal for civil engineers and transportation safety analysts designing safe roadway curves.

Ventilation per Number of People

This calculator estimates the required airflow (Q) based on the number of occupants and the recommended airflow rate per person. It’s especially useful for designing ventilation systems in offices, classrooms, conference halls, and other occupied spaces to ensure air quality and comfort.

Ventilation Airflow Requirement

This calculator determines the required airflow (Q) in cubic meters per hour based on the recommended air exchange rate, room area, and ceiling height. It helps HVAC professionals and building designers ensure proper ventilation according to safety and comfort standards.

Ventilation Power

This calculator helps estimate the required air flow rate (Q) for a ventilation system based on the room area, ceiling height, and air exchange rate. It’s useful for HVAC engineers, architects, and building planners to design effective air circulation systems for residential, commercial, or industrial spaces.

Area of Rectangular Duct

This calculator estimates the total surface area, shina length, and corner count required for manufacturing rectangular ventilation ducts. It considers duct dimensions, quantity, and optional seam allowances, making it essential for HVAC fabricators and planners.

Ventilation Grid Count

This calculator helps you determine the required number of ventilation grids based on the air flow rate, air velocity, and open area of a single grid. It’s useful for HVAC engineers and ventilation system designers to ensure sufficient air distribution in rooms and ducts. Simply input your airflow parameters to get the required grid count.

Ventilation Diffuser Count

This calculator helps HVAC professionals and engineers estimate the number of air diffusers required for a given air flow rate. By inputting the airflow (Q), air velocity (v), and diffuser diameter (d), it calculates how many diffusers are needed to distribute air effectively in a ventilation system. The tool simplifies the design process for HVAC layouts in residential, commercial, and industrial settings.

Engineering Calculators Online

Civil

Electrical

Pipeline

Roadway

Ventilation