Unit Conversion Guides

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If you read one page, read this one. It covers the single biggest source of silent conversion errors.

A US pint is 473 mL. A UK pint is 568 mL. Same name, 20% apart. Which units differ, which are identical, and how to tell what a source means.

Every common conversion as a printable table, computed from the exact unit definitions.

The exact factor, a full chart, fractional inches for trades, heights, and why A4 doesn't fit on Letter.

Stones for UK readers, the three different "tons", and the mass-versus-weight distinction most converters skip.

The only conversion with an offset as well as a ratio — which is why temperature differences convert differently.

Organised around real speed limits, plus knots, Mach, and the Fibonacci shortcut.

Cups to grams by ingredient, three sizes of tablespoon, butter sticks, and oven temperatures.

Convert anything 50+ units across six categories, instant, no sign-up.