How do I convert kg to grams for any ingredient?

Converting kg to grams is pure weight maths that applies to any food, not just onion, so 1 kg is always 1000 grams. For other amounts, or to add kilograms and stone, the weight converter at the link below handles grams, ounces and pounds in both directions.

Convert Onion from Kilograms to Grams

Onion converter

Use the tool below to convert onion from Kilograms to Grams.

Onion size swings from a 70 g small to a 150 g large, more than double. Setting the size below means “1 cup chopped” comes out right whether your onions are small or jumbo.

How many grams is a kg of onions?

A kg of onions is 1000 grams. This is a pure weight conversion, the same for any food, so the ratio never changes with size or density. Use the converter above for any amount, or the weight converter linked below to add kilograms and stone.

Out of onion? See onion substitutes →

Already chopping? The chopped onion converter moves straight between cups, grams, and spoons of prepped onion. See our Chopped Onion converter.

Need a milder, more delicate allium? Shallots (20–60 g) suit dressings and pan sauces. See our Shallot converter.

Spring onions (10–25 g) are tender and herbaceous, great raw or as a garnish. See our Spring Onion converter.

Mincing garlic for the same dish? Garlic cloves (2–7 g) bring pungent bite where onion brings sweet body. See our Garlic converter.

Enter an amount, pick your units, and set the size for counting whole onions.

Convert from

Convert to

Onion sizeSize applies to whole onions (small / medium / large).

Result

1000 g

Common Onion conversions

Quick reference for onion at medium size. Switch the size in the converter above for small or large.

Kilograms	Grams
0.25 kg	250 g
0.5 kg	500 g
1 kg	1000 g
2 kg	2000 g
3 kg	3000 g

Onion conversion chart

The chart below shows how whole onions (medium size) convert to cups, grams and ounces.

kg	g	onions	cups	cups (US)	oz	lb
0.25 kg	250 g	2.27 onions	1.5 cups	1.56 cups (US)	8.82 oz	0.55 lb
0.5 kg	500 g	4.55 onions	2.99 cups	3.13 cups (US)	17.64 oz	1.1 lb
1 kg	1000 g	9.09 onions	5.99 cups	6.25 cups (US)	35.27 oz	2.2 lb
2 kg	2000 g	18.18 onions	11.98 cups	12.5 cups (US)	70.55 oz	4.41 lb
3 kg	3000 g	27.27 onions	17.96 cups	18.75 cups (US)	105.82 oz	6.61 lb

Onion varieties and best uses

The conversions above are the same whatever variety you use; the difference is what each is good for. Here is how the common onion varieties compare.

Variety	Best for
Yellow / brown	All-purpose cooking, soups, caramelising: balanced and sweetens when cooked.
Red	Raw in salads and pickling: mild, colourful; also good roasted.
White	Mexican dishes and salsa: sharp and clean raw.
Sweet (Vidalia / Walla Walla)	Onion rings and raw slices: low pungency, high sugar.
Shallot	Dressings and pan sauces: delicate, subtle flavour.

Which should I pick?

For everyday cooking, soups, and caramelising, a yellow / brown onion is the default, with the most balanced flavour. For raw use in salads, salsa, or pickling, a red or sweet (Vidalia / Walla Walla) onion is milder. White onions suit Mexican dishes; shallots are the delicate choice for dressings and pan sauces.

Frequently Asked Questions

How many grams is a kg of onions?: A kg of onions is 1000 grams. This is a straight weight conversion, so half (0.5 kg) is 500 grams and double (2 kg) is 2000 grams. The ratio never changes with onion size or density, so the same figure works for any quantity you measure. Open the onion converter
How do I convert kg to grams for any ingredient?: Converting kg to grams is pure weight maths that applies to any food, not just onion, so 1 kg is always 1000 grams. For other amounts, or to add kilograms and stone, the weight converter at the link below handles grams, ounces and pounds in both directions. Kg to grams converter
Which onion variety should I use?: For everyday cooking, soups, and caramelising, a yellow / brown onion is the default, with the most balanced flavour. For raw use in salads, salsa, or pickling, a red or sweet (Vidalia / Walla Walla) onion is milder. White onions suit Mexican dishes; shallots are the delicate choice for dressings and pan sauces.

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