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Home » Main Courses

Onion to cups conversion (rough-chopped, medium-diced, minced)

Published: Jan 8, 2023 by Nicole B.

Many recipes call for a specific amount of chopped or diced onion (usually measured in cups). But how many onions of what size do you need to get, say, ¼ cup of finely diced onion? This guide will help you find out.

A yellow, a red and a white onion on a table.
Onions come in different sizes. Find out how many onions yield how many cups of chopped onion with this conversion guide.
Jump to:
  • About this guide:
  • Different onion cuts:
  • How many cups does a small onion yield:
  • How many cups does a medium-large onion yield:
  • How many cups does a large onion yield:
  • More cooking conversion guides:

About this guide:

This guide lists how many slices and how many cups of rough-chopped, medium-diced or finely diced (minced) onion you get from different-sized whole onions. The tables below allow you to easily calculate how many onions of what size you need to get however many cups of chopped onion you need.

Different onion cuts:

The tables below list amounts for four different cuts of onion:

  • sliced
  • rough-chopped
  • medium-diced
  • finely diced (minced)

Sliced onion:

You can slice an onion to get onion rings. (This is a great cut for caramelizing onions (or shallots), like for this gourmet grilled cheese, for example.) The number of slices listed in the tables below is for ⅛ inch-thick slices.

Onion slices on a wooden cutting board.
A sliced onion.

Rough-chopped onion:

The amounts for rough-chopped onions listed in the tables below are for chunks of onion that measure about ½ inch per side.

Rough-chopped onion on a wooden cutting board.
Rough-chopped onion.

Medium-diced onion:

The amounts for medium-diced onions listed in the tables below are for chunks of onion that measure about ¼ inch per side.

Medium-diced onion on a wooden cutting board.
Medium-diced onion.

Finely diced onion (minced):

The amounts for finely diced onions listed in the tables below are for chunks of onion that measure about ⅛ inch per side.

Finely diced onion on a wooden cutting board.
Finely diced onion.

How many cups does a small onion yield:

The measurements below are for one small onion (4 to 5 ounces and about 2 ¼ inches in diameter.) This is about the size of a lemon.

Slices (⅛th-inch):Rough-chopped (½-inch):Medium diced (¼-inch):Finely diced (⅛th-inch):
about 10about 1 cupabout 1 cupabout ¾ cup

How many cups does a medium-large onion yield:

The measurements below are for one medium-large onion (10 to 11 ounces and about 3 ¼ inches in diameter.) This is about the size of a Granny Smith apple.

Slices (⅛th-inch):Rough-chopped (½-inch):Medium diced (¼-inch):Finely diced (⅛th-inch):
about 14about 2 cupsabout 2 cups about 1 ½ cups

How many cups does a large onion yield:

The measurements below are for one large onion (13 to 14 ounces and about 3 ½ inches in diameter.) This is about the size of a small grapefruit.

Slices (⅛th-inch):Rough-chopped (½-inch):Medium diced (¼-inch):Finely diced (⅛th-inch):
about 14about 2 ¾ cupsabout 2 ¾ cups about 2 cups

More cooking conversion guides:

  • How many teaspoons are in a sprig? A conversion guide for common culinary herbs

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