Unit converter

Length factors (to and from meters)

Every length pair goes through meters as the base. Exact SI definitions for the imperial set (1 in = 0.0254 m). Handy reference for common one-way factors:

Weight works the same way through grams (1 lb = 453.59237 g exact avoirdupois; 1 oz = 28.349523125 g; ton here means the metric tonne = 1,000 kg).

Temperature is not a single factor

Celsius, Fahrenheit, and Kelvin share a scale size between C and K (1 degree), but their zeros differ. Fahrenheit also uses a different degree size (9/5). This tool converts by going to Kelvin first, then out:

• C to K: K = C + 273.15
• F to K: K = (F - 32) * 5/9 + 273.15
• K to C: C = K - 273.15
• K to F: F = (K - 273.15) * 9/5 + 32

Worked example: 100 °C to K = 373.15 to °F = 212. Boiling water at sea level is the usual sanity check. Absolute zero is 0 K (-273.15 °C / -459.67 °F). Values below 0 K are rejected.

What the tool rounds to

Length and weight results use up to 10 significant figures, then drop trailing zeros so 2.540000000 becomes 2.54. Temperature allows up to 6 decimal places when the fraction is messy, then trims the same way. Same-unit converts stay identical to the input. Status shows the pair you just ran so you can spot a swapped from/to quickly.

What this page will not convert

• No currency or live exchange rates.
• No cooking volume (cups, tablespoons) or density-based mass to volume.
• No historical units (cubits, stones as a separate path) or US survey feet.
• No short ton vs long ton. The weight "ton" here is the metric tonne only.
• No area, volume, speed, or pressure. Stick to length, mass, and temperature.

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