📏 Weights & Measures

A guide to converting imperial, US and metric measurements in the kitchen.

Weight: Imperial to Metric

ImperialMetric
1 oz 28g
2 oz 57g
4 oz (¼ lb) 113g
8 oz (½ lb) 227g
12 oz (¾ lb) 340g
16 oz (1 lb) 454g
2.2 lb 1kg

Volume: Imperial (UK) to Metric

Imperial (UK)Metric
1 tsp 5ml
1 tbsp (3 tsp) 15ml
1 fl oz 28ml
¼ pint (5 fl oz) 142ml
½ pint (10 fl oz) 284ml
1 pint (20 fl oz) 568ml
1¾ pints 1 litre

Volume: US to Metric / UK

USMetricNotes
1 US teaspoon 5ml Same as a UK teaspoon
1 US tablespoon 15ml Same as a UK tablespoon
1 US fl oz 30ml Slightly larger than a UK fl oz (28ml)
1 US cup 240ml UK recipes rarely use cups - measure by weight instead
1 US pint 473ml Smaller than a UK pint (568ml) - a common conversion trap
1 US quart 946ml = 2 US pints
1 US gallon 3.79 litres = 4 US quarts

Common Baking Ingredients: US Cups to Grams

Ingredient (1 US cup)Approx. weight
Plain / all-purpose flour 120g
Granulated sugar 200g
Caster sugar 225g
Soft brown sugar (packed) 220g
Butter 227g
Uncooked rice 185g
Rolled oats 90g
Why cup weights vary: a "cup" measures volume, not weight, so how densely an ingredient is packed changes the result — a cup of sifted flour weighs less than a cup of scooped flour, for example. Where possible, weigh ingredients on a kitchen scale rather than relying on cup measures, especially for baking. All conversions above are rounded for everyday kitchen use.