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Cooking measurement abbreviations

The two that cause mistakes: a small t (or tsp) is a teaspoon and a capital T (or Tbsp) is a tablespoon, three times bigger. oz is weight, fl oz is volume.

AbbreviationMeansSize
tsp, t, tsteaspoon4.93 ml
tbsp, T, tbs, tbltablespoon3 tsp, 14.79 ml
c, Ccup16 tbsp, 236.6 ml
fl ozfluid ounce2 tbsp, 29.6 ml
ozounce (weight)28.35 g
lb, #pound16 oz, 453.6 g
ptpint2 cups
qtquart4 cups
galgallon16 cups
g, grgram
kgkilogram1,000 g
ml, mLmilliliter
l, Lliter1,000 ml
pkgpackage
dozdozen12
pinchabout ⅛ tspnot exact
dash⅛ to ¼ tspnot exact
°F / °Cdegrees Fahrenheit / Celsiusoven temperature

When abbreviations are ambiguous

Handwritten recipes often use "t" for both spoons. If a quantity of salt or baking soda looks large, it is probably teaspoons. "c" usually means a cup, but in older British recipes "C" can mean Celsius. "oz" next to a liquid usually means fluid ounces; next to cheese, chocolate or flour it means weight.