{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"yeast-conversion"},"result":{"entity_type":"calculator","id":"yeast-conversion","calculator_id":"yeast-conversion","canonical_url":"https://tttkmbb.com/food/yeast-conversion","name":"Yeast Conversion Calculator","title":"Yeast Conversion Calculator – Instant, Active Dry and Fresh Yeast in Grams, Teaspoons, Packets and Cakes","category":"food","category_name":"Food & Cooking","tool_name":"convert_yeast_types","featured_mcp_tool":false,"description":"Converts an amount of instant, active dry or fresh (cake) yeast into the equivalent amounts of the other two types by weight (instant 1 : active dry 1.25 : fresh 3) and expresses them in grams, teaspoons, 7 g packets and 17 g cakes.","use_when":"A recipe calls for one type of yeast and you have another, or you need to convert between packets, teaspoons and grams of yeast.","do_not_use_when":"You need the yeast amount for a dough from baker's percentages (use pizza-dough or bakers-percentage), or you are working with sourdough starter, brewing yeast or nutritional yeast.","inputs":[{"name":"amount","label":"Amount","type":"number","required":true,"max":10000,"exclusive_min":0,"description":"Quantity of yeast you have or the recipe calls for, in unit.","example":7},{"name":"unit","label":"Unit","type":"enum","required":false,"default":"g","values":[{"value":"g","label":"Grams","aliases":["gram","grams"]},{"value":"tsp","label":"Teaspoons (3.1 g dry yeast)","aliases":["teaspoon","teaspoons"]},{"value":"packet","label":"Packet (7 g dry) or cake (17 g fresh)","aliases":["packets","package","sachet","envelope","cake","cakes"]}],"description":"Unit of amount; a packet means a 7 g (¼ oz) dry-yeast packet, or a 17 g (0.6 oz) cake when yeast_type is fresh_cake.","example":"g"},{"name":"yeast_type","label":"Yeast type","type":"enum","required":true,"values":[{"value":"instant","label":"Instant (rapid-rise, bread-machine)","aliases":["instant dry","rapid rise","rapid-rise","bread machine","quick rise"]},{"value":"active_dry","label":"Active dry","aliases":["active dry yeast","ady","dry"]},{"value":"fresh_cake","label":"Fresh (cake, compressed)","aliases":["fresh","cake yeast","compressed","wet"]}],"description":"Type of the yeast given by amount.","example":"instant"}],"outputs":[{"name":"instant_g","label":"Instant yeast","type":"number","unit":"g","decimals":2,"description":"Equivalent instant yeast."},{"name":"active_dry_g","label":"Active dry yeast","type":"number","unit":"g","decimals":2,"description":"Equivalent active dry yeast (1.25 × instant)."},{"name":"fresh_g","label":"Fresh yeast","type":"number","unit":"g","decimals":2,"description":"Equivalent fresh (cake) yeast (3 × instant)."},{"name":"instant_tsp","label":"Instant yeast","type":"number","unit":"tsp","decimals":2,"description":"instant_g / 3.1."},{"name":"active_dry_tsp","label":"Active dry yeast","type":"number","unit":"tsp","decimals":2,"description":"active_dry_g / 3.1."},{"name":"instant_packets","label":"Instant yeast packets","type":"number","unit":"packets","decimals":2,"description":"instant_g / 7 g."},{"name":"active_dry_packets","label":"Active dry packets","type":"number","unit":"packets","decimals":2,"description":"active_dry_g / 7 g."},{"name":"fresh_cakes","label":"Fresh yeast cakes","type":"number","unit":"cakes","decimals":2,"description":"fresh_g / 17 g (US 0.6 oz cake)."},{"name":"note","label":"How to use","type":"string","decimals":4,"description":"Handling differences between the yeast types."}],"input_schema":{"type":"object","properties":{"amount":{"description":"Quantity of yeast you have or the recipe calls for, in unit.","type":"number","maximum":10000,"exclusiveMinimum":0,"examples":[7]},"unit":{"description":"Unit of amount; a packet means a 7 g (¼ oz) dry-yeast packet, or a 17 g (0.6 oz) cake when yeast_type is fresh_cake.","type":"string","enum":["g","tsp","packet"],"default":"g","examples":["g"]},"yeast_type":{"description":"Type of the yeast given by amount.","type":"string","enum":["instant","active_dry","fresh_cake"],"examples":["instant"]}},"additionalProperties":false,"required":["amount","yeast_type"]},"output_schema":{"type":"object","properties":{"instant_g":{"description":"Equivalent instant yeast. Unit: g.","type":"number","x-unit":"g"},"active_dry_g":{"description":"Equivalent active dry yeast (1.25 × instant). Unit: g.","type":"number","x-unit":"g"},"fresh_g":{"description":"Equivalent fresh (cake) yeast (3 × instant). Unit: g.","type":"number","x-unit":"g"},"instant_tsp":{"description":"instant_g / 3.1. Unit: tsp.","type":"number","x-unit":"tsp"},"active_dry_tsp":{"description":"active_dry_g / 3.1. Unit: tsp.","type":"number","x-unit":"tsp"},"instant_packets":{"description":"instant_g / 7 g. Unit: packets.","type":"number","x-unit":"packets"},"active_dry_packets":{"description":"active_dry_g / 7 g. Unit: packets.","type":"number","x-unit":"packets"},"fresh_cakes":{"description":"fresh_g / 17 g (US 0.6 oz cake). Unit: cakes.","type":"number","x-unit":"cakes"},"note":{"description":"Handling differences between the yeast types.","type":"string"}}},"formula":"grams = amount × (1 for g; 3.1 for tsp; 7 for a dry packet; 17 for a fresh cake); instant_g = grams / (1 instant, 1.25 active dry, 3 fresh); active_dry_g = 1.25 × instant_g; fresh_g = 3 × instant_g; tsp = g / 3.1; packets = g / 7; cakes = fresh_g / 17","method":"Weight ratios follow manufacturer guidance (Red Star, King Arthur Baking): fresh yeast has about one third of the leavening power of instant yeast per gram and active dry about 80 %. One level teaspoon of dry yeast is taken as 3.1 g (a 7 g packet is 2¼ teaspoons); a US fresh-yeast cake is 0.6 oz (17 g), European blocks are 42 g.","sources":[{"name":"Red Star Yeast – Yeast conversion table (¼ oz packet = 2¼ tsp = 7 g; dry vs cake yeast)","url":"https://redstaryeast.com/yeast-baking-lessons/yeast-conversion-table/","type":"reference","retrieved_at":"2026-09-24"},{"name":"Wikipedia – Baker's yeast (instant, active dry and fresh yeast; substitution ratios)","url":"https://en.wikipedia.org/wiki/Baker%27s_yeast","type":"reference","retrieved_at":"2026-09-24"},{"name":"King Arthur Baking – Ingredient weight chart","url":"https://www.kingarthurbaking.com/learn/ingredient-weight-chart","type":"reference","retrieved_at":"2026-09-24"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"7 g instant yeast","inputs":{"amount":7,"unit":"g","yeast_type":"instant"},"expected":{"instant_g":7,"active_dry_g":8.75,"fresh_g":21,"instant_tsp":2.26,"active_dry_tsp":2.82,"instant_packets":1,"fresh_cakes":1.24},"url":"https://tttkmbb.com/api/v1/calculate/yeast-conversion?amount=7&unit=g&yeast_type=instant"},{"name":"1 packet active dry yeast","inputs":{"amount":1,"unit":"packet","yeast_type":"active_dry"},"expected":{"active_dry_g":7,"instant_g":5.6,"fresh_g":16.8,"instant_tsp":1.81,"active_dry_packets":1,"fresh_cakes":0.99},"url":"https://tttkmbb.com/api/v1/calculate/yeast-conversion?amount=1&unit=packet&yeast_type=active_dry"}],"faq":[{"q":"Can I swap instant and active dry yeast 1:1?","a":"In practice yes for most bread recipes; the 25 % difference is within the normal variation of rise times. Use the exact conversion for large batches or when timing matters."},{"q":"Why is a 7 g packet 2¼ teaspoons but the calculator shows 2.26?","a":"Because 3.1 g per teaspoon is a rounded average (7 g / 2.25 tsp = 3.11 g); the difference is far below what a measuring spoon can resolve."},{"q":"How do I use fresh yeast?","a":"Crumble it into the recipe's lukewarm liquid (or directly into the dough) and use within its short shelf life (about 2 weeks refrigerated); it should smell yeasty, not sour."}],"tags":["yeast conversion","instant vs active dry yeast","fresh yeast to dry yeast","yeast packet grams","teaspoons of yeast"],"related":[{"calculator_id":"pizza-dough","reason":"Yeast amount for pizza dough by baker's percentage."},{"calculator_id":"bakers-percentage","reason":"Scale yeast with the rest of a bread formula."},{"calculator_id":"baking-substitutions","reason":"Substitutes for other baking ingredients."}],"links":{"html":"https://tttkmbb.com/food/yeast-conversion","markdown":"https://tttkmbb.com/food/yeast-conversion.md","json":"https://tttkmbb.com/food/yeast-conversion.json","api":"https://tttkmbb.com/api/v1/calculate/yeast-conversion","schema":"https://tttkmbb.com/api/v1/calculators/yeast-conversion","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-24"},"timestamp":"2026-09-24T03:45:45Z","next_actions":[{"tool":"run_calculator","calculator_id":"yeast-conversion","reason":"Run Yeast Conversion Calculator with the inputs above."}],"links":{"markdown":"https://tttkmbb.com/food/yeast-conversion.md"}}