Cooking Unit Converter

Convert kitchen measurements between US customary and metric in your browser. Volume (cup, tbsp, tsp, fl oz, mL, L, pint, quart, gallon), weight (oz, lb, g, kg), length (in, cm for cake-pan sizes), and oven temperature (°C, °F, K) with a UK gas-mark reading. Pick a category, type a value, choose a source unit, and see it converted to every other unit in the same category. Fraction shorthand like 1 1/2 is supported. Nothing leaves your browser.

About the conversions
  • Volume is anchored on millilitres. US customary: 1 tsp = 4.929 mL, 1 tbsp = 14.787 mL, 1 fl oz = 29.574 mL, 1 cup = 236.588 mL, 1 pint (US liquid) = 473.176 mL, 1 quart = 946.353 mL, 1 gallon = 3,785.412 mL. These are US measures — UK recipes use Imperial (1 UK pint = 568 mL, 1 UK gallon = 4,546 mL). A "cup" in the tool is the US 240-mL cup; many UK and Australian recipes use 250 mL.
  • Weight is Avoirdupois (the system used in US kitchens): 1 oz = 28.350 g, 1 lb = 453.592 g. UK "ounces" of weight are the same; UK "stones" (1 stone = 14 lb) are not modelled. A troy ounce (precious metals) is 31.103 g and is not what the tool means by "oz".
  • Length is just inch ↔ centimetre. 1 in = 2.54 cm (exact, by international agreement since 1959). Useful for cake-pan sizes (9 in = 22.86 cm) and roll-out dimensions.
  • Temperature is the affine °F ↔ °C ↔ K conversion. °C = (°F − 32) × 5/9; K = °C + 273.15. The one and only point where the scales meet is −40° (equal in °C and °F).
  • Gas mark is a UK oven notation. The mapping is canonical (BBC Good Food / Delia Smith / Kenwood): mark 1/4 = 110 °C, 1/2 = 120 °C, 1 = 135 °C, 2 = 150 °C, 3 = 160 °C, 4 = 180 °C, 5 = 190 °C, 6 = 200 °C, 7 = 220 °C, 8 = 230 °C, 9 = 240 °C. The tool shows the closest mark for any input °C; ties go to the cooler mark.
  • Fraction shorthand is supported in the value box: 1 1/2 means 1.5. A bare fraction like 3/4 is rejected because it is too easy to type by accident (e.g. a date); use the mixed form instead.
  • Volume ↔ weight is not modelled — it needs the ingredient's density. 1 cup of water is 240 mL and ~240 g; 1 cup of flour is 240 mL but ~125 g. Use the volume tool for the volume, the weight tool for the weight, and a recipe-specific conversion for ingredients.