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Convert 600+ units across 30 categories - length, weight, temperature, cooking cups to grams, data, physics and chemistry - instantly in your browser.
Type a number, get the answer. No convert button, no upload, no ads wall, no account. 30 categories covering daily life, physics, electrical engineering and chemistry - with the exact SI/NIST factors shown, never magic numbers.
Popular conversions: cm to inches · kg to pounds · Celsius to Fahrenheit · km to miles · liters to gallons · cups to grams (per ingredient) · MB to MiB · kcal to kJ · bar to psi · mph to km/h
Tabs below group everything: Daily, Physics, Electrical, Chemistry. Search finds any unit by name or symbol.
Conversion happens as you type. Use the swap button to reverse the direction instantly.
One tap copies the result with both units. Precision chips control decimals - auto handles huge and tiny physics numbers.
Daily
Physics
Electrical
Chemistry
Exact SI/NIST factors
1 cm = 0.393700787402 in
Reverse: 1 in = 2.54 cm
1 cm = 0.393700787402 in (exact SI/NIST factor)
Hard drive makers use MB (1,000,000 bytes). Windows shows MiB (1,048,576 bytes) but calls it MB - that is why a 500 GB drive shows as 465 GB. Both are here, honestly labeled.
Cups measure volume, grams measure weight. A cup of honey weighs almost 3x a cup of oats. Pick the ingredient and this tool uses its real density - no fake one-size answer.
Every factor is the exact SI or NIST value - 1 inch is exactly 25.4 mm by international agreement, 1 lb is exactly 0.45359237 kg. Approximate historical units are marked.
Cooking conversions pair with the Citation Generator for students. Data storage pairs with the JSON Formatter for developers.
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