US legal cup to Imperial teaspoon

The US legal cup (nutrition labels) is exactly 240 mL. The US customary cup (8 US fl oz) is approximately 236.6 mL. In cooking, both are treated as 240 mL; the difference is negligible for most recipes.

The US legal cup is 240 mL; the Australian metric cup is 250 mL — about 4% larger. Australian recipes calling for 4 cups use 1,000 mL vs 960 mL with US cups, which can matter in baking.

Approximately 4.167 US legal cups fit in one liter (1,000 mL ÷ 240 mL). Practically, 4 cups ≈ 960 mL ≈ 1 liter — often used interchangeably in cooking.

Most US drip coffee makers define a "cup" as 5 or 6 fl oz (148–177 mL) — smaller than the standard 8 fl oz measuring cup. A "12-cup" coffee maker typically makes 60–72 fl oz, or only about 7–9 standard 8-oz cups.

Baking is chemistry — flour, fat, liquid, and leavening interact in precise ratios. Too much flour (even 10–15% extra from packing a cup too tightly) produces dense, dry results. Too much liquid makes cake batter collapse. Cooking is more forgiving because sautéing, braising, and roasting rely on technique and taste adjustment, not exact chemical reactions. This is why professional bakers weigh ingredients in grams rather than using volume cups — a cup of flour can vary from 120 to 160 g depending on how it is scooped.

One imperial teaspoon equals approximately 5.919 mL — slightly larger than the US teaspoon (4.929 mL) and the metric teaspoon (5 mL).

An imperial teaspoon is approximately 5.92 mL; a metric teaspoon is exactly 5 mL. The metric teaspoon is now standard in UK cooking, medicine, and pharmacology.

The imperial teaspoon is obsolete in modern UK, Australian, and Canadian cooking, which all use the 5 mL metric teaspoon. It may appear in cookbooks published before the 1970s metrication period.

A culinary pinch — the amount you can hold between thumb and forefinger — is roughly 0.3–0.5 mL, or about 1/16 of a teaspoon. Professional recipe developers have measured this and found surprising consistency across people: the human fingertip geometry constrains how much fine powder you can grip. A "dash" (liquid) is about 0.6 mL, and a "smidgen" is half a pinch (~0.15 mL). These folksy terms survive in recipes because they map to real, repeatable volumes — within the tolerance that salt and spice measurements actually require.

The WHO recommended the 5 mL metric teaspoon for medication dosing in the 1970s to eliminate ambiguity between imperial (5.92 mL), US (4.93 mL), and other teaspoon sizes. A calibrated 5 mL oral syringe is now the recommended tool for all liquid medicines.