Free Tool · Recipe Scaling
Recipe Scaler: Halve or Double Any Recipe, Eggs Included
Paste an ingredient list and get it scaled to any factor, in fractions you can actually measure. It handles the three things that do not divide cleanly: partial eggs, leavening that cannot be doubled straight, and salt that tastes stronger than the maths suggests.
Halved recipe
Scales as you type. Lines it cannot read are passed through untouched and flagged, rather than guessed at.
Why halving is not just division
Most of a recipe scales linearly. The interesting parts do not.
Flour, sugar, butter, milk and oil are bulk ingredients. Halve them and nothing surprising happens. The tool divides those straight down the middle and rounds to a measurement you can actually get with a cup and a spoon, which is why it gives you 3/8 cup rather than 0.375.
Then there are three groups that do not behave, and this is where most halved bakes go wrong.
Eggs
You cannot buy half an egg. Rounding one way makes the batter dry, the other way makes it eggy and rubbery.
Leavening
Baking powder and soda scale with volume when you go down, but scaling straight up over-inflates a bake and it collapses.
Salt and strong spice
Perceived intensity does not track quantity in a straight line. Doubled salt tastes more than twice as salty.
The tool flags each of these as it hits them rather than silently dividing, so you know which lines need a decision from you.
The hard one
How to halve an egg without ruining the crumb
A large egg is about 50 grams: roughly 30 grams of white and 20 of yolk. Those two halves do completely different jobs, so you cannot just use the yolk and call it half an egg. The white is water and protein, which sets structure. The yolk is fat and emulsifier, which carries richness and tenderness.
Beat one whole egg, then weigh out what you need. Half an egg is 25 grams, or about 1½ tablespoons of beaten egg. This keeps the white to yolk ratio intact, which is the whole point. The tool gives you the gram figure whenever a scaled egg lands on an awkward number.
The alternative most recipes suggest, rounding to the nearest whole egg, works fine when you are scaling something forgiving like a muffin batter. It does not work for a custard, a lava cake or anything where the egg is the structure. If you are scaling down our air fryer lava cake, weigh it.
Scaling up
Leavening and salt do not double when you double
Double a cake and you have twice the batter but not twice the surface area, and the bake takes longer. A leavening dose sized for the original will keep producing gas for longer in the bigger bake, over-inflate the crumb and then collapse it as the structure sets. The professional rule of thumb is to scale leavening at about three quarters of the ingredient factor once you go past 1.5x, and the tool applies that automatically.
Salt and strong flavours are a perception problem rather than a chemistry one. Doubling the cinnamon in a batter does not give you twice the cinnamon flavour, it gives you something that tastes overwhelmingly of cinnamon. The tool trims these to about 85 percent of the straight multiple above 1.5x and tells you to taste before committing.
Scaling down is the safer direction. Halving leavening and salt straight is fine, because the smaller bake also finishes faster and the two effects cancel out. It is only scaling up that needs the trim.
The part recipes skip
Scaling changes the bake, not just the shopping list
Here is the thing almost no recipe tells you when it offers a half-batch option. If you halve the ingredients but keep the same pan, the batter now sits at half the depth, and a shallower bake cooks faster and dries out sooner. Keep the temperature the same and start checking well before the original time.
If you halve the ingredients and move to a pan with roughly half the floor area, the depth stays about the same and the original time is close to correct. That is usually the better move, and it is what the pan size calculator is for.
Scaling up in a basket is harder, because you cannot simply use a bigger tin. Two batches at the same setting almost always beats one crowded pan. If you do go to a taller pan, drop the temperature about 10°F and add roughly 20 percent to the time so the middle catches up with the top, and confirm the new settings with our air fryer cooking time calculator rather than guessing.
| You did this | Temperature | Time |
|---|---|---|
| Halved, same pan | No change | Check 20 to 40% early |
| Halved, smaller pan | No change | Close to original |
| Doubled, two batches | No change | Same per batch |
| Doubled, one deeper pan | Down 10°F | Add about 20% |
Small batch in practice
Why air fryer bakers scale down more than anyone else
A basket holds one small pan. That is the whole reason this tool exists on a baking site rather than a general cooking one. Standard recipes are written for a 9 x 13 or a 12 cookie tray, and none of that goes in a 6 quart basket, so almost every recipe you bring to an air fryer needs scaling before it needs converting.
The order matters: scale first, then convert. Work out the quantities for the pan you actually own, then take the original oven temperature and time and put them through the oven to air fryer converter. Doing it the other way round means converting a time for a quantity you are not going to bake.
Small bakes are also less forgiving on timing. A half batch of air fryer chocolate chip cookies goes from set to dry in under two minutes, so the doneness cue matters more than the clock. The air fryer baking chart lists the internal temperature targets we bake to.
Questions
Recipe Scaler questions, answered
QHow do I halve a recipe?
Divide every bulk ingredient by two: flour, sugar, butter, milk, oil. Then handle the three that do not divide cleanly. For eggs, beat one whole egg and weigh out 25 grams, which is about 1 1/2 tablespoons, so the white to yolk ratio stays intact. Leavening and salt can be halved straight when scaling down. Paste your ingredients into the tool above and it does all of this and converts awkward decimals into measurable fractions.
QHow do you measure half an egg?
Crack a whole egg into a bowl, beat it until the white and yolk are fully combined, then weigh out 25 grams, or measure about 1 1/2 tablespoons. A large egg is roughly 50 grams, 30 of white and 20 of yolk, and those parts do different jobs, so using just the yolk is not the same as using half an egg. For anything where egg provides the structure, weigh it rather than estimating.
QCan you just double a recipe?
Not quite. Bulk ingredients double fine, but leavening and salt should not. A doubled batter takes longer to bake, so a doubled dose of baking powder keeps producing gas past the point the structure can hold it, and the crumb over-inflates then collapses. Scale leavening to about three quarters of the multiple, and salt and strong spices to about 85 percent. The tool applies both adjustments automatically above 1.5x.
QDoes halving a recipe change the baking time?
Yes, if you keep the same pan. Half the batter in the same tin sits at half the depth, and a shallower bake cooks faster, so keep the temperature the same and start checking 20 to 40 percent earlier. If you also move to a pan with about half the floor area, the batter depth stays similar and the original time is close to right. Depth is what drives bake time, not the total quantity.
QHow do you scale a recipe up for an air fryer?
Usually you should not scale up at all. A basket holds one small pan, so two batches at the same temperature almost always beats one crowded pan. If you do move to a taller pan, drop the temperature about 10F and add roughly 20 percent to the time, because deeper batter needs longer for the heat to reach the middle without the top overcooking.
QWhy does my scaled recipe taste too salty?
Because perceived saltiness does not rise in a straight line with quantity. Doubling the salt gives you something that tastes more than twice as salty, which is why the tool trims salt and strong spices to about 85 percent of the straight multiple when you scale up. Scaling down does not have this problem, so halving salt straight is fine.
QWhat is 3/4 cup halved?
3/8 cup, which is 6 tablespoons. This is the kind of answer that makes people give up on halving, which is why the tool converts awkward fractions into the nearest measurement you can actually make with standard cups and spoons, and drops to tablespoons whenever a cup measurement falls below a quarter cup.
QShould I scale the recipe or convert it to air fryer settings first?
Scale first, then convert. Work out the ingredient quantities for the pan you actually own, then take the original oven temperature and time and run them through the conversion calculator. Converting first means you have worked out a time for a quantity you are not going to bake, and pan depth, which is what really sets the time, will have changed underneath you.
QDoes the tool work with grams and millilitres?
Yes. Paste the list in whatever units the recipe uses. Metric weights and volumes scale cleanly and the tool keeps them in the same unit, rounding to one decimal place under 20 grams and to whole numbers above that. Cups and spoons get converted to the nearest usable fraction instead, since you cannot measure 0.37 of a cup.
QCan I scale a bread or yeast recipe?
Bulk ingredients yes, yeast with care. Yeast is a living leavener and it multiplies during proofing, so it does not scale like baking powder. For a doubled dough keep the yeast close to the original amount and let it proof a little longer rather than doubling the yeast. The tool flags yeast for the same reason it flags baking powder, so you can make that call yourself.
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Sujata Thapa
Sujata shares healthy, easy and delicious air fryer recipes, learned through years of hands-on cooking. Every guide here is tested in her own kitchen, so the numbers behind this tool come from real bakes in a standard basket rather than from a spec sheet.