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Conversion Calculators

For when the rest of the world refuses to use metric. Or vice versa.

Convert anything to anything. Except regret — that stays.

Convert between mm, cm, m, km, inches, feet, yards, and miles.

A light-year is 9.46 trillion km. Just in case you needed that.

Convert between mg, g, kg, pounds, ounces, and tons.

A cubic meter of feathers weighs exactly the same as a cubic meter of steel.

Convert between Celsius, Fahrenheit, and Kelvin with formula shown.

-40° is where Celsius and Fahrenheit finally agree. A rare moment of harmony.

Convert between km/h, mph, m/s, and knots.

Light travels at 300,000 km/s. Your commute does not.

Convert between sq ft, sq m, acres, and hectares.

One acre is roughly a football field minus the end zones. Very specific.