Onion substitute

Herbs, spices and aromatics · Checked against 3 sources · Updated November 4, 2026

Quick answer

For 1 small onion, use 1 tablespoon of instant minced onion, rehydrated, or 1 teaspoon of onion powder. One-quarter cup of chopped fresh onion equals a small onion. Charts give a range of 1 to 2 tablespoons of instant minced onion. Start low and taste.

How much do you need?

small onion

Fractions work: 1 1/2, ¾, 0.5. The amounts below update as you type.

Show only options that are

What to use

  1. Instant minced onion

    • Vegan
    • Dairy-free
    • Gluten-free
    • Nut-free
    • Egg-free
    • 1 tbsp 15 ml instant minced onion
    How
    Soak in a little water for a few minutes first.
    Best for
    Soups, stews, meatloaf.
    What changes
    Milder.
    Skip it when
    Raw uses and caramelizing.
  2. Onion powder

    • Vegan
    • Dairy-free
    • Gluten-free
    • Nut-free
    • Egg-free
    • 1 tsp 5 ml onion powder
    Best for
    Rubs, dressings, sauces.
    What changes
    Concentrated, with no texture.

Diet labels describe the ingredients as normally made. Check packages for gluten and allergens. Some refined sugar is filtered with bone char, which matters if you eat vegan.

Which swap for which job

UsePickWhy
Soups and stewsInstant minced onionRehydrates in the pot.

Do not substitute here

  • Caramelized onion dishes. Dried onion. It cannot caramelize.

Questions

How much onion is a small onion?

About a quarter cup, chopped.

Sources

Ratios come from these sources, in our words. Where they disagree, we say so or pick the amount that matches tested results. Ratios are a starting point. Taste and adjust.