All conversion categories
19 categories, 598 direct conversion pairs. Pick a category for its full matrix, unit pages and tables.
- Length Converter — Millimeters to miles — every length unit in one converter, with the exact definition each factor comes from. (9 units, 72 pairs)
- Weight and Mass Converter — Kilograms, pounds, ounces, stone and tonnes — converted with exact definitions and the arithmetic shown. (7 units, 42 pairs)
- Volume and Cooking Converter — Cups, tablespoons, teaspoons, fluid ounces, pints, quarts and gallons against milliliters — with a fraction chart built for recipes. (9 units, 72 pairs)
- Temperature Converter — Celsius, Fahrenheit and kelvin — the two formulas and every reference point that matters. (3 units, 6 pairs)
- Area Converter — Square feet, square meters, acres and hectares for homes, land and farms. (6 units, 30 pairs)
- Speed Converter — Miles per hour, kilometers per hour, knots and meters per second. (5 units, 20 pairs)
- Time Converter — Seconds, minutes, hours, days and weeks with worked examples. (5 units, 20 pairs)
- Data Storage Converter — Decimal (kB, MB, GB, TB) and binary (KiB, MiB, GiB) storage units, clearly separated — the reason a 1 TB drive shows as 931 GB. (7 units, 42 pairs)
- Pressure Converter — Tire, weather and engineering pressure — psi, bar, kPa, atm, mmHg and inHg. (8 units, 56 pairs)
- Energy Converter — Food calories, kilojoules, watt-hours, kilowatt-hours and BTUs. (7 units, 42 pairs)
- Torque Converter — Newton-meters, pound-feet, inch-pounds and kilogram-force meters for engines and torque wrenches. (4 units, 12 pairs)
- Fuel Economy Converter — mpg, UK mpg, km/L and L/100km — including the reciprocal relationship people get wrong. (4 units, 12 pairs)
- Medical Dose Converter — Micrograms, milligrams and grams — the 1000× steps where a decimal slip matters. (3 units, 6 pairs)
- Power Converter — Watts, kilowatts, megawatts, mechanical and metric horsepower, and BTU per hour. (6 units, 30 pairs)
- Data Transfer Rate Converter — Mbps, MB/s, Gbps and GB/s — the 8× trap between bits and bytes. (8 units, 56 pairs)
- Blood Glucose Converter — mmol/L and mg/dL for glucose readings, with the molar-mass factor stated openly. (2 units, 2 pairs)
- Angle Converter — Degrees, radians, gradians, turns, arcminutes and arcseconds. (6 units, 30 pairs)
- Flow Rate Converter — L/min, L/s, m³/h, cfm and gpm for pumps, ventilation and plumbing. (6 units, 30 pairs)
- Frequency Converter — Hertz, kilohertz, megahertz, gigahertz and RPM — frequency in radio, processors, monitors and motors, with the exact decimal steps. (5 units, 20 pairs)