Cooking weights and measures

Lore & Background

In recipes, quantities may be specified by mass, volume, or count. For most of history, cookbooks did not specify precise amounts, instead using terms like 'a nice leg of spring lamb' or 'a piece of butter the size of a small apricot'. Informal measures such as a 'pinch', 'drop', or 'hint' (soupçon) continue to be used occasionally. Today, most of the world prefers metric measurement by weight, though volume measurements persist among home cooks in the United States and the rest of North America. Liquid ingredients are generally measured by volume worldwide, while dry bulk ingredients like sugar and flour are measured by weight in most of the world and by volume in North America. Small quantities of salt and spices are measured by volume worldwide due to the lack of precise household balances. Meat is described by weight or count, eggs by count, and vegetables by weight or count despite variability in size.

Reader's Guide

The significance of cooking weights and measures lies in their impact on recipe reproducibility and cross-cultural communication. The article notes that most of the world uses metric units (litres, millilitres, grams, kilograms, degrees Celsius), while the United States uses pounds and ounces for weight and US customary volume units. The United Kingdom often includes both imperial and metric measures. The article also highlights that with accurate electronic scales, weighing liquids has become more common, as 1 mL of water weighs 1 gram. The US system uses binary submultiples (halves, quarters, eighths) derived from ancient Egyptian practices, and some units like the gill and wineglass have been deprecated. These variations mean that cooks must be aware of the specific system used in a recipe to achieve intended results.

Did You Know?

• Australia uses a metric tablespoon of 20 mL, while New Zealand uses 15 mL.
• The US system of binary submultiples is sometimes speculatively linked to ancient Egyptian practices, but this connection is not established as a direct lineage in mainstream metrological canon.

From Vague Tradition to Measured Precision

For centuries, cooking instructions relied on sensory judgment rather than numerical exactness. A recipe might call for "a nice leg of spring lamb" or butter "the size of a small apricot," leaving the cook to interpret quantities through experience and intuition. Even salt was often left to "sufficient" amounts. This informal tradition persists in small ways today, with terms like "a pinch," "a drop," or the French "soupçon" (a hint) still appearing in recipes. This marked a decisive shift from the old tradition of approximation toward reproducible, measurable instructions. Yet the legacy of imprecision never fully disappeared; it simply coexists alongside the standardized measurements that now dominate modern cookbooks worldwide.

A World Divided by Measurement Philosophy

Today's global kitchen is split along a fundamental line: how to quantify ingredients. Most of the world now prefers metric measurement by weight, yet home cooks across the United States and the rest of North America still gravitate toward volume-based instructions. This divide plays out differently depending on the ingredient. Liquid ingredients are generally measured by volume everywhere. Small amounts of salt and spices tend to be measured by volume globally, since few households own sufficiently precise balances. Meat is typically described by weight or count, such as "a 2 kilogram chicken" or "four lamb chops." Eggs are almost always specified by count, while vegetables are usually given by weight or occasionally by count, despite the inherent imprecision of counting items that vary so widely in size.

The Metric System and Its Regional Quirks

Although most of the world now uses the metric system—litres and millilitres for volume, grams and kilograms for mass, and degrees Celsius for temperature—regional quirks abound. Australia stands out as the only metricated country with a 20 mL tablespoon, unlike other metricated nations that settled on 15 mL. In the United Kingdom, recipes tend to include both imperial and metric measures, following guidance from the Guild of Food Writers, while teaspoons and tablespoons carry formal imperial definitions that differ from the metric utensils now commonly manufactured.

Weighing Liquids and the Rise of Precision

The arrival of accurate electronic scales has transformed how cooks handle liquid ingredients, making it practical to weigh water and milk rather than rely on volumetric utensils. Similarly, one fluid ounce of water weighs approximately one ounce, so a UK pint (20 fl oz) of water translates directly to 20 ounces by weight. Milk, having roughly the same density as water, follows the same convenient interchangeability. In commercial food production, where large volumes are involved, this precision becomes critical. Even home cooks can benefit from greater accuracy at times—for instance, water at 4.0 °C can be volumetrically measured and then weighed to calibrate an unknown measuring utensil without requiring a water-density adjustment. This shift underscores a broader trend: technology is quietly dissolving the old boundary between volume and weight in the kitchen.