Yeast Converter

There are three main forms of baker's yeast: fresh (also called compressed yeast), dried active yeast, and instant (fast-action or easy-bake) yeast. All three contain the same organism — Saccharomyces cerevisiae — but in different concentrations and with different handling requirements. Converting between them is straightforward once you know the ratios.

The standard conversion ratios are 3:1.5:1 — three parts fresh equals one and a half parts dried equals one part instant. In practice: if your recipe calls for 7g instant yeast, use 10.5g dried active or 21g fresh. Most UK bread recipes are written for dried active or instant yeast because fresh yeast has a short shelf life (about 2 weeks refrigerated) and limited retail availability.

Dried active yeast requires proofing: dissolve it in warm water (35–40°C) with a pinch of sugar and wait 10–15 minutes until it froths. This step activates the dormant cells and confirms the yeast is alive before committing it to a dough. Instant yeast skips this — its finer granules hydrate quickly and it can be added directly to dry flour. Most modern recipes use instant yeast for this convenience.

Fresh yeast, where available (from some supermarket bakery counters or health food shops), gives a mild, characterful flavour that many bakers prefer. It freezes well — crumble into small portions, wrap, and freeze for up to 3 months. Thaw at room temperature and use immediately. Any of the three types will leaven bread successfully; the choice comes down to availability, convenience, and personal preference.