Universal Unit Converter
Length, area, volume, mass, speed, temperature, angle, pressure, and energy — with the conversion factor and chain shown, not hidden. Covers §1.14 of the foundations material.
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The entered value expressed in every unit of the selected category.
Every conversion routes through the category's SI base unit — value × (factorfrom) ÷ (factorto) — so chains never accumulate rounding from unit-to-unit hops. Temperature is affine (offset + scale), which is why it gets its own formulas.