How to scale a recipe up or down
Scale by yield or by a multiplier, ingredient by ingredient. Raising agents and seasoning get the correction nobody else applies.
Free. No signup needed.The short answer
Divide the yield you want by the yield the recipe makes, then multiply every ingredient by that number. Past about 1.5x that stops being true for raising agents, salt and strong spice, which climb slower than the rest, so this tool eases them and tells you by how much.
How to scale a recipe up or down
BakerInbox
Scale by
Scale factor
1.50x
Flour, sugar, butter, eggs, and liquid
Raising agents
1.50x
Straight, same as everything else
Salt and spice
1.50x
Straight, same as everything else
Nothing to correct. Under 1.5x, and every time you scale down, a straight multiply is right. Everything uses the same factor.
Your ingredients
Scaled
338 g
Scaled
338 g
Scaled
338 g
Scaled
6 eggs
Scaled
1 1/2 tsp
Raising agent. Straight multiply at this size.
Or bake it as cupcakes
Cupcakes
21
1.32 kg of scaled batter, 60 g a case
Bake time
18-22 min
Same oven temperature as the cake
Fill each case two thirds. Start checking at 18 minutes: a case this shallow sets in half the time a deep tin needs, and the gap between done and dry is small.
Tin and time
More batter needs more tin, and a round tin grows with the square of its width, so going up two inches is often more than the factor asks for. Keep the oven the same and judge by a clean skewer and a springy top, not the clock. Above 4x, mix in separate batches.
Weigh in grams, never cups, because a small error in the factor grows with every gram. Rows named as a raising agent, salt, spice or extract are eased above 1.5x and say so; everything else scales straight. Start under on seasoning and lift by taste, since it cannot be taken back out.
Scaling for a bigger order is the easy part. BakerInbox keeps the enquiry, the quote, and the recipe in one place.
Start free trialScale factor and cupcakes at a glance
| Scale factor | Everything else | Raising agents | Under a straight multiply | Salt and spice | Note |
|---|---|---|---|---|---|
| 0.50x | 0.50x | 0.50x | None | 0.50x | Halving. Everything straight, weigh it. |
| 1.50x | 1.50x | 1.50x | None | 1.50x | Straight multiply. Nothing to correct. |
| 2.00x | 2.00x | 1.74x | 13% | 1.80x | Raising agents start easing here. |
| 3.00x | 3.00x | 2.41x | 20% | 2.54x | About the limit for one bowl. |
| 4.00x | 4.00x | 3.03x | 24% | 3.25x | Beyond this, mix in separate batches. |
Flour, sugar, butter, eggs and liquid scale straight at every factor. Raising agents, salt and strong spice only ease once the factor passes 1.50x, and not at all when you scale down.
Cake recipe to cupcakes
| One tin of | Batter | Cupcakes | Bake |
|---|---|---|---|
| Round 6 in | 490 g1 lb 1 oz | 8 | 18-22 min |
| Round 7 in | 666 g1 lb 8 oz | 11 | 18-22 min |
| Round 8 in | 870 g1 lb 15 oz | 14 | 18-22 min |
| Round 9 in | 1.10 kg2 lb 7 oz | 18 | 18-22 min |
| Round 10 in | 1.36 kg3 lb | 22 | 18-22 min |
| Round 12 in | 1.96 kg4 lb 5 oz | 32 | 18-22 min |
| Square 8 in | 1.11 kg2 lb 7 oz | 18 | 18-22 min |
| Square 10 in | 1.73 kg3 lb 13 oz | 28 | 18-22 min |
| Rectangle 9 x 13 in | 2.03 kg4 lb 7 oz | 33 | 18-22 min |
One tin 2 in deep filled half, at 60 g of batter a case filled two thirds. Double it for a two-layer recipe. Cupcakes go in at the same temperature as the cake, so only the time changes.
Made with BakerInbox. Free cake tools at bakerinbox.com/tools
Scaling a recipe
Scaling is one number: what you need divided by what the recipe makes. Flour, sugar, butter, eggs and liquid follow it exactly. Raising agents, salt and strong spice do not, and that is what makes a scaled-up cake dome, crater and taste soapy.
The maths
One number does most of the work
The scale factor is the target yield divided by the original yield. Twelve to eighteen is 1.5, twenty-four to forty-eight is 2. Multiply flour, sugar, butter, eggs and liquid by it and weigh them on the scales, never in cups, because a small error in the factor grows with every gram. If the bigger batch also means a bigger tin, the tin conversion calculator works out which size actually holds it.
The rise
Raising agents do not scale linearly
This is the part that ruins a big cake, and no other scaling calculator handles it. A large batter has less surface for gas to escape from, so it holds more of what the baking powder makes and rises more per gram. Multiply the powder straight and the cake climbs too fast, craters in the middle and carries the soapy, metallic taste of bicarbonate that never reacted. Above 1.5x this tool eases the raising agents back: 13% under a straight multiply at 2x, 24% under at 4x. Below 1.5x, and every time you scale down, it leaves them alone and says so.
Salt and spice
Season under, then taste
Salt, cinnamon, mixed spice, ginger, clove and extracts ease more gently than the raising agents, about 10% under a straight multiply at 2x. Not because a big batch needs less salt in principle, but because a big batch is an expensive place to over-season and you cannot take it back out. Taste the batter and lift it if it needs it. If you are short of something instead of long, the baking substitution calculator has the UK swap and the amount.
Cupcakes
A cake recipe converts straight to cupcakes
Any cake batter works as cupcakes. A standard case filled two thirds takes about 60 g, so the count is the batter weight divided by 60. Keep the oven exactly where the cake recipe says and change only the time: 18 to 22 minutes rather than 30 to 45, because a case that shallow sets fast. Once you know the count, the cupcake frosting calculator sizes the buttercream and the cupcake pricing calculator prices the box.
Tin and time
Volume changes the tin and the bake
More batter needs more tin, and a round tin grows with the square of its width, so going up two inches is often more than the factor asks for. How much batter that tin takes is the check worth doing before you mix. Keep the temperature the same and judge by a clean skewer and a springy top, not the clock, and remember a fan oven runs 20 C below a conventional one if you need the oven temperature converted. Above 4x, mix in separate batches rather than one that overloads the mixer.
FAQ
Common questions
Do ingredients scale linearly?
Most do, two groups do not. Flour, sugar, butter, eggs and liquid scale straight at any factor. Raising agents and strong seasoning do not once you go past about 1.5x, because a bigger batter holds gas better and reads spice differently, so a straight multiply over-leavens and over-seasons. This tool eases those two groups and shows you by how much.
How much baking powder when doubling a recipe?
About 1.74 times the original, not 2. That is roughly 13% under a straight multiply, which is where published trade guidance for a doubled batch sits. On 2 teaspoons, use 3 and a half. Double it properly and the cake rises too fast, drops in the middle, and can taste soapy or metallic.
How do I scale a recipe up or down?
Divide the yield you want by the yield the recipe makes, then multiply every ingredient by that number. To take an 8 portion recipe to 12, the factor is 1.5. To halve it, the factor is 0.5. Weigh in grams so the ratio holds, and ease the raising agents once the factor passes 1.5.
Can we use a cake recipe for cupcakes?
Yes, any cake batter bakes as cupcakes with no change to the recipe. Fill each case two thirds, about 60 g of batter, and drop the time. A two-layer 8 inch cake recipe makes roughly 29 cupcakes.
How do you convert cake to cupcake time?
Keep the temperature the recipe gives and cut the time to about 18 to 22 minutes, from the 30 to 45 a cake takes. A cupcake case is shallow, so the middle sets long before a deep tin would. Start checking at 18 minutes with a skewer.
How much should I scale salt and spices?
A little under the full factor. Salt, strong spice and extracts start around 10% under a straight multiply at 2x and about 19% under at 4x. Taste the batter and lift them if it needs it, because a big batch is an expensive place to over-season and it cannot be taken back out.
Does bake time double when I double a recipe?
No. Bake time follows the depth of the tin, not the amount of batter. Keep the temperature the same and check for a clean skewer and a set top. A deeper tin takes longer, a wider shallow one is quicker, so start checking well before the original time is up.
Can I scale a recipe by more than 4x?
You can, but split it into separate batches. Most recipes scale cleanly to about 3x or 4x. Past that, one bowl overloads the mixer and the raising agents get unpredictable, so two batches of 4x beat one of 8x.
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