Engineering Calculators – Electrical, Mechanical and Physics

Professional engineering calculators for electrical, mechanical, civil, and chemical applications. From Ohm's Law to pipe flow — accurate, instant results with full formulas.

✓ 22 All Online Calculators✓ No login required✓ Mobile Ready

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Torque Calculator Heat Transfer

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Resistor Color

Decode 4-band resistor color codes and find resistance values.

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Wire Gauge

Look up AWG wire gauge specifications: diameter, area, resistance and current capacity.

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Beam Deflection

Calculate maximum deflection for simply supported and cantilever beams under point load.

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LED Resistor

Calculate the correct resistor value for an LED circuit.

Electrical Engineering

Calculate voltage, current, resistance, and power using Ohm's Law. Our electrical calculators cover voltage drop, wire sizing, power factor, 3-phase systems, and solar panel output.

Mechanical Engineering

Compute torque, horsepower, gear ratios, beam deflection, stress and strain, moment of inertia, and structural loads. Perfect for mechanical design and analysis.

Fluid Mechanics

Calculate pipe flow rates, Reynolds numbers, friction losses, and pump power requirements. Our fluid calculators support both metric and imperial units.

Physics Calculators

From kinetic energy and projectile motion to pendulum periods and wave frequencies — our physics calculators cover classical mechanics, thermodynamics, and electromagnetism.

Engineering Calculators Guides

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Ohm's Law Explained – Formula, Examples & Applications

Learn Ohm's Law with clear explanations, the V=IR formula, worked examples, and applications in electrical engineering and circuit design.

How to Calculate Ohm's Law – Voltage, Current & Resistance

Learn Ohm's Law with clear examples. Calculate voltage, current, and resistance using V = IR. Includes power formulas and practical electrical engineering applications.

Popular Engineering Calculators Calculations

Frequently searched calculations — answered instantly with formulas and step-by-step explanations.

Pipe flow rate calculator Beam deflection calculator Heat transfer calculator Wire gauge (AWG) calculator

Engineering Calculators Formula Reference

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Ohm's Law Formula – V = IR Explained Force Formula – Newton's Second Law Kinetic Energy Formula Gravitational Potential Energy Formula Pressure Formula – Physics

Frequently Asked Questions

What is Ohm's Law and how do I use it?▼

Ohm's Law: V = I × R, where V = Voltage (volts), I = Current (amps), R = Resistance (ohms). You can rearrange for any variable: I = V/R or R = V/I. Our Ohm's Law calculator solves for any of the three values.

How do I calculate electrical power?▼

Power (W) = Voltage (V) × Current (A). For three-phase systems: P = √3 × V × I × Power Factor. A 120V circuit drawing 10A uses 1,200W (1.2 kW). Our electricity calculator estimates kWh cost from watts and usage hours.

How do I calculate torque?▼

Torque (Nm) = Force (N) × Distance (m). In mechanical engineering, engine torque (Nm) = (Power in watts ÷ Angular velocity in rad/s). Our torque calculator handles both static and rotational torque calculations.

How do I calculate beam deflection?▼

Deflection depends on load type, beam length, material stiffness (Young's modulus), and cross-section moment of inertia. For a simply supported beam with central point load: δ = PL³ ÷ (48EI). Our beam deflection calculator handles common configurations.

How do I calculate pipe flow rate?▼

Flow Rate (Q) = Area × Velocity, or use the Hazen-Williams formula for friction losses. Q = 0.4322 × C × D^2.63 × S^0.54, where C = roughness coefficient, D = diameter, S = hydraulic slope. Our pipe flow calculator covers both laminar and turbulent flow.

✓ Documented formulas — all tools use standard industry formulas✓ Updated regularly — content reviewed 2026✓ Used by thousands daily✓ Free — no sign-up required