Gelatin and agar set very differently, so swapping them by weight ruins a dessert: too little agar stays liquid, and too much turns rubbery. This converter gives the matching amount of gelatin sheets, gelatin powder, and agar powder for your liquid volume and your chosen firmness.
Enter your liquid volume in millilitres and pick the firmness you want. The base is a medium set: two grams of gelatin, which is one sheet, sets one hundred millilitres, while one gram of agar sets two hundred millilitres. Soft sets use eighty percent of the base, and firm sets use one hundred twenty five percent.
Example: five hundred millilitres at a medium set needs ten grams of gelatin powder, which is five sheets, or two and a half grams of agar powder. For a firm set the same liquid needs twelve and a half grams of gelatin or about three grams of agar.
Tip: bloom gelatin sheets in cold water first. Five minutes in cold water softens them evenly, and squeezing out the water before melting keeps the liquid amount exact.
Tip: boil agar, do not just warm it. Agar only dissolves fully at a rolling boil, and it sets as it cools below about forty degrees, so work quickly once it leaves the heat.
Tip: agar sets faster and firmer than gelatin, and it will not melt at room temperature. That makes it great for warm rooms, but a poor choice for a dessert that should melt softly on the tongue.
Common question: Can I use agar in a recipe written for gelatin? Yes, with this converter, but expect a different texture. Agar gives a clean, brittle snap, while gelatin gives a soft, creamy wobble.
Common question: Are gelatin sheets all the same weight? Most standard sheets weigh about two grams each, but some brands differ. If your pack states a different weight, scale the sheet count from the gram amount the tool gives.
Common question: Why did my agar dessert not set? Usually the agar never reached a full boil, or the liquid was very acidic. Boil the agar for two full minutes, and add sharp fruit juices after boiling rather than before.
Measuring by weight is the single best habit for swaps like these. Cups pack differently every time, while grams stay exact, and exact amounts are what make a substitute behave like the original ingredient.
Test every swap in a small batch first. A half recipe shows you the texture and flavour change without risking a full cake or a full pot of jam, and a small test teaches you faster than any article can.
Write the swap that worked on the recipe card. Your oven, your flour brand, and your pans all shift results a little, and your own notes turn a general calculator into a personal guide that fits your kitchen.
This tool runs fully in your browser, so nothing you type is sent to a server. There is no account and no sign-up, and your recipe amounts never leave your own device.
Adjust to your own taste once you know the base ratio. A little more liquid for a softer crumb, or a little less for a firmer set, is a fair change once the standard swap works well.
Store dry substitutes mixed and labelled. A jar of self-raising flour or cake flour mix, dated and sealed, saves measuring time on busy baking days and keeps the ratio right.
Bookmark this tool and use it whenever a recipe calls for something your pantry lacks. A good substitute keeps dinner on track, and the calculator keeps the swap honest.
This tool is free to use as often as you like. Run it for each recipe you adapt, and let it carry the conversion maths while you focus on the cooking itself.