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Brewhouse Converter

The everyday bench converter — volumes, weights, gravity, temperature and more, all live. Type into any one box and every other unit in that category updates at once. (For firkins, kilderkins and old regional bushels, reach for The Brewer's Ledger instead — this one keeps to the modern brewhouse.)

How the conversions are figured

Volume & mass are built up from exact legal definitions: the US gallon is 3.785411784 L and the imperial gallon is 4.54609 L, so US and imperial fluid ounces, pints and quarts differ and are listed separately. The beer barrels follow brewing convention — US bbl = 31 US gal (the TTB beer barrel) and UK bbl = 36 imperial gal. Pounds and ounces come from the exact lb = 453.59237 g.

Gravity. Specific gravity is the anchor. Points are simply (SG − 1) × 1000. SG ↔ °Plato uses the ASBC cubic °P = −616.868 + 1111.14·SG − 630.272·SG² + 135.997·SG³, inverted numerically so the grid round-trips on itself exactly. °Brix and °Plato are both percent sucrose by mass, so on this grid they read alike — but a refractometer pointed at wort reads high, which is what the helper below the grid is for.

The rest. Color: EBC ≈ SRM × 1.97, with °Lovibond from the common SRM = 1.3546·°L − 0.76 (an empirical fit — treat it as close, not exact). Pressure is referenced to 1 atm = 101.325 kPa = 14.696 psi. Extract potential converts PPG (points per pound per US gallon) to metric L·°/kg at ×8.3454. Water hardness expresses everything as ppm CaCO₃ — handy for unit-matching, though the Water Adjustment tool is where actual ion chemistry lives.

Brewhouse Converter · A brewer's working tool

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Constants from exact legal definitions · verified from first principles

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