Conversion Calculators Comparison
All 36 Conversion calculators in one comparison table, with the formula and a worked example for each.
What you can work out with these calculators
Unit conversion calculators move a value between measurement systems — length, mass, volume, temperature, speed, area and digital data — using exact defined factors where they exist and published approximations where they do not. The factor used is shown with the result so you can see how much rounding is involved.
- Convert length, mass and volume between metric and imperial units.
- Convert temperatures between Celsius, Fahrenheit and Kelvin.
- Convert cooking volumes and weights for recipe scaling.
- Move between decimal and binary data units such as gigabytes and gibibytes.
Compare calculators by what you enter
All 36 calculators here, one row each: what each tool works out and the fields it asks for before it does. Open any row to use the calculator itself.
| Calculator | What it works out | What you enter |
|---|---|---|
| Length Converter | Convert between length units | Value · From · To |
| Weight Converter | Convert between weight units | Value · From · To |
| Volume Converter | Convert between volume units | Value · From · To |
| Area Converter | Convert between area units | Value · From · To |
| Speed Converter | Convert between speed units | Value · From · To |
| Data Storage Converter | Convert between data units | Value · From · To |
| Angle Converter | Convert between angle units | Value · From · To |
| Energy Converter | Convert between energy units | Value · From · To |
| Pressure Converter | Convert between pressure units | Value · From · To |
| Frequency Converter | Convert between frequency units | Value · From · To |
| Temperature Converter | Convert between Celsius, Fahrenheit, and Kelvin | Temperature Value · From · To |
| Time Converter | Convert time units (hours, minutes, seconds) | Value · From · To |
| Force Converter | Convert force units (N, kN, lbf) | Value · From · To |
| Fuel Efficiency Converter | Convert fuel economy (MPG, L/100km) | Value · From · To |
| Cooking Measurement Converter | Convert cooking measurements | Amount · From · To |
| Clothing Size Converter | Convert international clothing sizes | US Size · Clothing Type |
| Shoe Size Converter | Convert international shoe sizes | US Shoe Size · Type |
| Currency Converter (Fixed Rate) | Convert currencies at fixed rates | Amount · From · To |
| Torque Converter | Convert torque units (Nm, lb-ft) | Torque Value · From · To |
| Power Converter | Convert power units (W, kW, HP) | Power Value · From · To |
| Electrical Unit Converter | Convert electrical units info | Value · From · To |
| Radiation Converter | Convert radiation measurement units | Value · From · To |
| Density Converter | Convert density units | Density Value · From · To |
| Viscosity Converter | Convert viscosity units | Viscosity · From · To |
| Bit Rate Converter | Convert data rates between bps, Kbps, Mbps, Gbps | Value · From · To |
| Luminance Converter | Convert between lux, foot-candles, nits | Value · From · To |
| Molarity Converter | Convert concentration between M, mM, µM, nM | Value · From · To |
| Flow Rate Converter | Convert between L/s, L/min, m³/h, GPM | Value · From · To |
| Paper Size Converter | A/B-series paper sizes and dimensions | Series · Number (0-10) |
| Fraction ↔ Percent ↔ Decimal | Convert between fraction, percent, and decimal | Convert · Numerator (or percent) · Denominator |
| Roman Numeral Converter | Convert between Arabic numbers and Roman numerals | Convert · Value |
| PPM / Concentration Converter | Convert between ppm, ppb, and percent | Value · From · To |
| Thermal Conductivity Converter | Convert W/(m·K) to BTU/(ft·h·°F) etc | Value · From · To |
| Radiation Dose Converter | Convert between Gray, rad, Sievert, rem | Value · From · To |
| Wire Gauge (AWG) Converter | Convert AWG to mm and mm² | AWG |
| Acceleration Converter | m/s², g-force, ft/s², km/h per second | Value · From |
Prefer the annotated list? Browse the full list with one line on what each calculator does.
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