Engineering Calculators

Professional engineering calculators for electrical circuits, mechanical systems, fluid dynamics, and structural analysis. Accurate tools built for engineers, students, and makers.

Ohm's Law Calculator

Calculate voltage, current, and resistance using V = IR

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Resistor Color Code

Decode resistor color bands to find resistance values

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Wire Gauge Calculator

Calculate wire gauge, current capacity, and resistance per foot

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Capacitance Calculator

Calculate capacitance, charge, and voltage for capacitor circuits

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LED Resistor Calculator

Find the correct resistor value to safely power any LED

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Voltage Divider Calculator

Calculate output voltage from two resistors in series

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Power Calculator

Calculate electrical power using P = VI, P = I²R, or P = V²/R

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Torque Calculator

Calculate torque, force, and lever arm length for rotational systems

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Pressure Calculator

Calculate pressure, force, and area — supports PSI, kPa, and bar

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Flow Rate Calculator

Calculate volumetric flow rate, velocity, and pipe cross-section

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Beam Calculator

Calculate bending moment, shear force, and deflection for loaded beams

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Stress & Strain Calculator

Calculate mechanical stress, strain, and Young's modulus for materials

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Gear Ratio Calculator

Calculate gear ratios, output speed, and torque multiplication

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Hydraulic Calculator

Calculate hydraulic pressure, force, and flow in fluid power systems

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Thermal Expansion Calculator

Calculate linear and volumetric expansion of materials with temperature change

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Spring Constant Calculator

Calculate spring constant, force, and displacement using Hooke's law

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Professional Engineering Tools for Every Discipline

Our engineering calculators cover the full spectrum of engineering work — from basic electrical calculations like Ohm's law and resistor values to mechanical problems like torque, gear ratios, and spring constants, through to fluid systems and structural beam analysis. Each calculator uses industry-standard formulas and returns results with the precision engineers need.

Why Use Our Engineering Calculators?

  • Covers electrical, mechanical, fluid, and structural engineering
  • Industry-standard formulas with clear variable definitions
  • Instant results — no sign-up, no ads blocking your work
  • Works on any device including mobile and tablet
  • Completely free, privacy-focused, and always available