Engineering Calculators Comparison

Compare Engineering calculators side by side. Free engineering calculators for electrical, mechanical and civil work — beam loads, wire gauge, Ohm law, torque and more.

Engineering Calculators

Voltage Drop Calculator

Calculate voltage drop in cable

Power Factor Calculator

Calculate power factor

Gear Ratio Calculator

Calculate gear ratio

Torque Calculator

Calculate torque with force, radius and angle

LED Resistor Calculator

Calculate LED series resistor

Capacitor Calculator

Calculate capacitance

Battery Life Calculator

Estimate battery life

Wire Gauge Calculator

Calculate wire gauge

RPM Calculator

Calculate rotational speed

Horsepower Calculator

Calculate horsepower

Inductor Calculator

Calculate inductance

Impedance Calculator

Calculate RC/RL impedance

Beam Load Calculator

Calculate beam stress

Hydraulic Calculator

Calculate hydraulic pressure

Thermal Expansion

Calculate thermal expansion

kVA to kW Converter

Convert apparent power kVA to real power kW

Belt Length Calculator

Calculate V-belt length for two pulleys

Flow Rate Calculator

Calculate pipe flow rate from velocity and area

Sound Level Addition

Add two sound levels in decibels

Shaft Power Calculator

Calculate power from torque and RPM

Spring Rate Calculator

Calculate spring constant (Hooke's law)

Resonant Frequency Calculator

Calculate LC circuit resonant frequency

Transformer Ratio Calculator

Calculate transformer turns ratio

Hydraulic Power Calculator

Calculate pump hydraulic power

Stress & Strain Calculator

Calculate stress, strain and Young's modulus

Beam Deflection (Simply Supported)

Max deflection of a uniformly loaded beam

Euler Buckling Load

Critical load for column buckling

Pipe Flow Rate (Darcy-Weisbach)

Pressure drop and velocity in pipe flow

Steel Weight Calculator

Weight of steel plates, bars, and tubes

Concrete Mix Design

Cement, sand, and gravel quantities for a mix

Structural Load Calculator

Dead, live, and wind load combinations (LRFD)

Electrical Energy Cost

Electricity cost of an appliance

Resistor Combination

Series and parallel resistance

Capacitor Energy

E = ½CV² energy stored in a capacitor

Inductor Energy

E = ½LI² energy stored in an inductor

RC Time Constant

τ = RC for capacitor charging/discharging

Cable Sizing Calculator

Wire size from current and voltage drop

Ventilation CFM Calculator

Airflow needed for room ventilation

Torque Wrench Setting

Adjusted torque when using an extension

Bearing Load Rating

Required dynamic load rating from bearing life

Engine Efficiency Calculator

Thermal efficiency and BSFC

Pump Power Calculator

Hydraulic power and motor size for pumps

Tank Volume Calculator

Volume of cylindrical and rectangular tanks

Heat Exchanger (LMTD)

Log mean temperature difference method

PCB Trace Width Calculator

IPC-2221 trace width for a given current

Bolt Torque Calculator

Clamping force from bolt torque

Pulley System Calculator

Effort needed with multiple pulley ropes

Lever Calculator

Fulcrum position or effort for a class-1 lever

About CalcProMaster calculators

CalcProMaster is a free library of 1206 online calculators across 20 categories — finance, health, math, business, construction, engineering, conversion, education and more. Every calculator runs entirely in your browser: no sign-up, no paywall, and no data leaves your device.

What makes these calculators different is transparency. Each tool shows the exact formula it uses and a step-by-step breakdown of how your inputs become the result, so you can verify the math instead of trusting a black box. Result interpretation, common mistakes, assumptions and limitations are documented on every calculator page, alongside worked examples and an FAQ. Health and finance tools cite the standard formulas they follow — Mifflin-St Jeor for calorie needs, standard amortization for loans — and state plainly where a calculator's answer should be confirmed with a professional.

The guides library goes deeper on the calculations people search for most: percentage and discount math, loan EMI and amortization, income-tax brackets, calorie and macro planning, concrete volumes and more — each with the formula, worked examples and links to the matching calculator. The glossary defines the terminology in plain language, and the public formula QA dashboard shows the verification status of every calculator's math.

Popular starting points: loan EMI calculator, BMI calculator, percentage calculator, random number generator, and concrete calculator — or browse a category above to find the tool you need.

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