Onion (Chopped): Grams to Cups Conversion

'One medium onion' is cooking's vaguest measurement: it can range from 100g to 300g. For a soup, it might not matter, but in sauces, meatballs, or fillings, excess onion releases water that can ruin the texture. Weighing chopped onion gives you total control over flavor and moisture.

Quick convert

  • US cup = 236.588 mL
  • 1 tbsp = 14.787 mL
  • 1 tsp = 4.929 mL

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Based on the measured density of Onion (Chopped) (0.676 g/mL). Values rounded; real weight varies by brand, packing and temperature. Full sources in the tool on ChefSolver.

Reference table

gCups
500.3
1000.6
1500.9
2001.3
2501.6
3001.9
3502.2
4002.5
4502.8
5003.1
6003.8
7004.4
8005.0
9005.6
10006.3

FAQ

Small, Medium, Large Onion: What are the weights?
Roughly: Small = 110g, Medium = 150-170g, Large = 250g+. But nature varies. If a recipe calls for '1 cup chopped onion', aim for about 150g.

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