Engineering Calculators
Practical, everyday engineering math: unit conversions, electrical, construction, mechanical, HVAC and structural calculators. Metric and imperial units, built-in sanity checks, and AI explanations.
🔁 Unit Conversion
- Length Convertermm, cm, m, km, in, ft, yd, mi
- Area Converterm², ft², acres, hectares
- Volume ConverterL, m³, gallons, ft³, yd³
- Mass & Weight Converterg, kg, tonne, oz, lb, tons
- Pressure Converterpsi, bar, kPa, MPa, inH₂O
- Temperature Converter°C, °F, K, °R
- Torque ConverterN·m, lb·ft, lb·in, kgf·m
- Force ConverterN, kN, lbf, kip, kgf
- Flow Rate ConverterL/s, m³/h, GPM, CFM
- Power ConverterW, kW, hp, BTU/h, tons
- Energy ConverterJ, kWh, BTU, kcal, therm
- Speed Converterm/s, km/h, mph, ft/s, knots
- Density Converterkg/m³, g/cm³, lb/ft³
⚡ Electrical
- Ohm's Law CalculatorEnter any 2 of V, I, R, P
- Voltage Drop CalculatorCopper/aluminium, 1-phase, 3-phase, DC
- Wire Size CalculatorSmallest AWG for ampacity and voltage drop
- AWG ↔ mm² ConverterWire gauge diameter and area
- Breaker Size CalculatorLoad current × 125% → standard breaker
- Battery Runtime CalculatorBattery / UPS backup time
- Electricity Cost CalculatorAppliance cost per day, month, year
- Solar Panel Size CalculatorArray kW and panel count
- Resistor Color Code4-band and 5-band decoder
- Series & Parallel ResistorsEquivalent resistance
🏗️ Construction & Civil
- Concrete CalculatorSlabs, footings, columns + bags
- Rebar Weight Calculatord²/162 kg per meter
- Brick & Block CalculatorBricks and mortar for a wall
- Paint CalculatorLiters / gallons for a room
- Tile CalculatorTiles, boxes and waste
- Flooring CalculatorLaminate, vinyl, hardwood boxes
- Drywall CalculatorSheets, screws, compound
- Roof Pitch Calculatorx/12 pitch ↔ angle ↔ %
- Stair CalculatorRisers, treads, stringer, code check
- Gravel, Mulch & Soil CalculatorCubic yards, tons, bags
- Slope & Grade CalculatorGrade %, angle, ratio, ADA check
⚙️ Mechanical & Fluids
- Pipe Flow Velocity CalculatorQ = A·v, size a pipe
- Pipe Pressure Drop (Hazen-Williams)Friction loss in water pipes
- Tank Volume CalculatorVertical, horizontal, rectangular, partial fill
- Pump Power CalculatorHydraulic and shaft power
- Gear Ratio CalculatorRatio, output RPM and torque
- Belt & Pulley CalculatorDriven RPM, belt speed, belt length
- Torque, Power & RPM CalculatorP = T·ω — enter any 2
- Bolt Torque CalculatorT = K·D·F
- Thermal Expansion CalculatorΔL = α·L·ΔT
🌡️ HVAC & Energy
- AC BTU CalculatorRoom air-conditioner size
- Heat Loss CalculatorQ = U·A·ΔT
- CFM ↔ Air Changes per HourVentilation rate for a room
- Fuel Economy & Trip CostL/100km ↔ MPG + trip cost
🏛️ Structural
- Beam Deflection CalculatorSimply supported: moment, shear, deflection
- Stress & Strain Calculatorσ = F/A, ε = ΔL/L, E = σ/ε
- Section Properties CalculatorArea, I, S, r for common shapes
- Factor of Safety CalculatorFoS, margin, utilization