A general-purpose unit converter covering length, mass, volume, temperature, area, speed, pressure, and energy across metric and imperial systems. Pick a category, then choose source and target units; the result updates live as you type. A swap button reverses the direction without re-typing the value.
Conversions use exact published factors (e.g. 1 inch = 25.4 mm; 1 pound = 453.59237 g) and the standard linear formulas for temperature. Calculations run in browser-native double precision, so there’s no rounding drift from network round-trips. Useful for quick everyday questions — recipe units, fuel economy, room sizes — without leaving the page.
Celsius/Fahrenheit/Kelvin use the exact linear formulas (°F = °C × 9/5 + 32; K = °C + 273.15). Results are shown to a sensible number of decimals; the underlying calculation uses full JavaScript double precision.
Yes — 1 imperial gallon ≈ 4.546 L, 1 US gallon ≈ 3.785 L. Both are listed separately so you don’t have to remember which is which.
US customary cups (236.588 mL), tablespoons, and teaspoons are included alongside metric mL/L. Be aware US cups, UK cups, and metric cups all differ slightly.
No — each conversion is a single multiplication or formula evaluated in your browser.
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