UnitSwap — Help & Documentation

A universal unit converter with 200+ units across 15 categories. Features real-time conversion, unit swapping, reference pairs, and custom temperature formulas. All calculations are client-side.

1. Click a category pill (Length, Weight, Temperature, etc.) 2. Select From and To units from the dropdowns 3. Type a value in the input field 4. The result updates in real-time 5. Use Swap to reverse units, Copy to copy the result

Length — Mile, Km, Meter, Foot, Inch, Yard, Nautical Mile, Light Year, etc.
Weight — Pound, Kg, Ounce, Gram, Stone, Carat, Tonne, etc.
Temperature — Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Newton, Rømer
Volume — Gallon, Liter, Cup, Pint, Quart, mL, fl oz, etc.
Area — sq m, sq ft, Acre, Hectare, sq km, sq mi
Speed — mph, km/h, m/s, knots, Mach
Data — Byte, KB, MB, GB, TB, PB, bits
Time — Second, Minute, Hour, Day, Week, Month, Year
Pressure — Pa, Bar, PSI, atm, mmHg, Torr
Energy — Joule, Calorie, kWh, BTU, eV
Power — Watt, Horsepower, BTU/h, kW
Frequency — Hz, kHz, MHz, GHz, rpm
Acceleration — m/s², g-force, ft/s²
Force — Newton, Pound-force, Dyne, kgf
Density — kg/m³, g/cm³, lb/ft³, lb/gal

Temperature conversions use formulas, not simple multiplication: °F = °C × 9/5 + 32, K = °C + 273.15, etc. The converter handles all 8 temperature scales with exact formulas.

• -40 is the same in both Celsius and Fahrenheit
• 1 GB = 1024 MB (binary) in Data Storage
• Use Light Year for astronomical distances
• Reference pairs change based on the selected category
• The Swap button is useful for reverse lookups

Unexpected result: Check that you selected the correct units. Some units have similar names (e.g., US Gallon vs Imperial Gallon).
Very small/large numbers: JavaScript may show scientific notation for extreme values. This is normal.
Category not loading: Click the category pill again. Ensure the page has fully loaded.