Browse by category
12 conversion domains, from everyday to technical.
Length
Convert between metric and imperial length units: meters, feet, inches, miles, and more.
Area
Convert between square meters, square feet, acres, hectares, and more.
Volume
Convert between liters, gallons, cubic meters, fluid ounces, and more.
Weight & Mass
Convert between kilograms, pounds, ounces, stones, tonnes, and more.
Temperature
Convert between Celsius, Fahrenheit, and Kelvin.
Speed
Convert between mph, km/h, m/s, knots, and more.
Pressure
Convert between pascal, bar, psi, atmosphere, torr, and more.
Energy
Convert between joules, kilowatt-hours, BTU, calories, and more.
Power
Convert between watts, kilowatts, horsepower, BTU/hour, and more.
Data
Convert between bits, bytes, kilobytes, megabytes, gigabytes, and binary units.
Force
Convert between newtons, pound-force, kilogram-force, and more.
Torque
Convert between newton-meters, foot-pounds, inch-pounds, and kilogram-force meters.
Time
Convert between seconds, minutes, hours, days, weeks, months, and years.
Angle
Convert between degrees, radians, gradians, arc minutes, and arc seconds.
Data Transfer
Convert between bits per second, Mbps, Gbps, and megabytes per second.
More than a unit converter
Practical calculators
Solve real-world engineering, construction, and electrical problems.
Concrete Volume
ConstructionCalculate slab, beam, and column concrete volume in cubic yards or cubic meters.
Ohm's Law
ElectricalCalculate voltage, current, resistance, and power using Ohm's law (V = IR).
Voltage Drop
ElectricalCalculate wire voltage drop for any conductor length, gauge, and load.
Horsepower ↔ kW
EngineeringConvert between mechanical horsepower and kilowatts for engines and motors.
BMI Calculator
HealthCalculate Body Mass Index from height and weight in metric or imperial units.
Flow Rate
EngineeringCalculate volumetric or mass flow rate for pipes and ducts.
Built for clarity and confidence
Accurate formulas
Every conversion uses exact constants or NIST-verified factors. Ambiguities like US vs imperial gallon are clearly flagged.
Practical explanations
Not just results — formulas, worked examples, and reference tables so you understand the answer.
Professional UX
Mobile-first design, keyboard accessible, fast loading, and free of clutter.
Reference guides
All guides →SI vs Imperial Units
A clear guide to the metric and imperial systems, where they differ, and which countries use which.
Mass vs Force
Why kg ≠ kgf, and how to avoid the most common unit confusion in engineering.
US vs Imperial Gallon
A US gallon and an imperial gallon are not the same — here's the difference.
Common Pressure Units
psi, bar, pascal, atm — which to use and when. Gauge vs absolute explained.
Temperature Conversion Explained
Celsius, Fahrenheit, and Kelvin formulas with worked examples.
Torque Units Explained
N·m vs ft·lb vs in·lb — torque unit conversions for mechanics and engineers.
Reference tables
Quick-access conversion tables for length, weight, temperature, pressure, data sizes, and SI prefixes — no inputs needed.
UnitFormula is a technical calculator platform covering unit conversion, engineering calculations, construction tools, and electrical references. Every result includes the formula, a worked example, and a reference table — so you understand the answer, not just the number. All conversion factors are derived from NIST and SI standards. Ambiguous units (US vs imperial gallon, tonne vs short ton, gauge vs absolute pressure) are explicitly flagged.