Yeast Converter

Last updated: June 2026

Yeast amount

From yeast typeTo yeast type

Converted yeast amount

21 g

Instant yeast equivalent

7 g

Formula

instant yeast is the baseline. Active dry yeast is estimated at 1.25 x instant yeast; fresh yeast is estimated at 3 x instant yeast.

About this calculator

The Yeast Converter helps convert between fresh yeast, active dry yeast, and instant yeast. It is useful when a bread recipe names one yeast type but you have another.

Yeast Converter method

The calculator applies the visible formula to the values entered. It is designed for practical planning and checking, so keep the assumptions visible when comparing scenarios.

instant yeast is the baseline amount
active dry yeast is usually a little higher than instant
fresh yeast is usually about 3 times instant yeast by weight

How to use the Yeast Converter

Choose the yeast type in the recipe.
Enter the recipe yeast amount in grams.
Choose the yeast type you want to use.
Read the converted amount.
Adjust proofing method if switching active dry or fresh yeast.
Watch dough rise rather than relying only on time.

Worked examples

Instant to fresh yeast

Input: 7 g instant yeast

Calculation: fresh yeast about 3 x instant

Result: Use about 21 g fresh yeast.

Fresh to instant yeast

Input: 30 g fresh yeast

Calculation: instant yeast about fresh / 3

Result: Use about 10 g instant yeast.

When this calculator is useful

The Yeast Converter helps convert between fresh yeast, active dry yeast, and instant yeast. It is useful when a bread recipe names one yeast type but you have another.

Use it as a quick planning tool before editing a recipe, placing an order, choosing packaging, or comparing options. For anything that affects safety, delivery terms, customer pricing, or a commercial commitment, check the final details against the original recipe, supplier, courier, or official source.

Inputs that matter most

Yeast type: Instant, active dry, and fresh yeast differ in water content and handling.
Dough temperature: Warm dough rises faster; cold dough rises slower.
Sugar and fat: Enriched dough may need more time or a different yeast level.
Salt: Too much salt can slow yeast activity.

Common mistakes to avoid

Check 1: Old yeast may be weak even if the converted amount is correct.
Check 2: Active dry yeast may need blooming depending on the brand and recipe.
Check 3: Sourdough starter is not a direct yeast substitute by simple weight.
Check 4: Very long fermentation usually uses less yeast.

Planning notes

Area	What to check
Units	Keep grams, millilitres, centimetres, kilograms, and time units consistent.
Rounding	Round practical kitchen or shipping values after checking the calculated result.
Tolerance	Allow margin for packaging, recipe texture, oven variation, courier rules, or handling space.

Edge cases

Old yeast may be weak even if the converted amount is correct.
Active dry yeast may need blooming depending on the brand and recipe.
Sourdough starter is not a direct yeast substitute by simple weight.
Very long fermentation usually uses less yeast.

Limitations

This is general baking information only. Use visual dough readiness and recipe guidance alongside the conversion.

Yeast conversion ratios are practical baking rules, not guarantees.
Fermentation depends on temperature, flour, salt, sugar, fat, and time.

Frequently asked questions

How much fresh yeast equals 7 g instant yeast?

A common estimate is about 21 g fresh yeast.

Is active dry yeast the same as instant?

No. Active dry often needs a slightly higher amount and may need rehydrating.

Can I replace yeast with sourdough starter?

Not directly. Starter adds flour and water as well as wild yeast and bacteria.

Why did my dough not rise?

Yeast age, temperature, salt, sugar, flour strength, and timing can all affect rise.

Should I use grams?

Yes. Yeast amounts are small, so weighing is more reliable.

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What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.