Recipe Scaler

Scale any recipe up or down. Enter your ingredients, set the target servings, get exact quantities instantly.

Free Private Calculator

Original serves → Scale to

Ingredients (one per line)

What the scaler does not account for

The numbers above are mathematically correct and practically incomplete. Multiplying ingredients by a ratio handles the arithmetic — but cooking is physics, chemistry, and geometry operating on food. A doubled bread recipe does not just need twice the flour; it needs a different kneading time, a different proofing window, and possibly a different pan. A tripled cookie batch with tripled baking powder will taste metallic and collapse. The scaler gave you a starting point. This guide tells you where to override it.

When to scale vs. when to reformulate

Not every recipe survives scaling. Some should be multiplied. Others need to be rethought from scratch. This depends on the recipe category, not the multiplier.

Recipe type	Scales cleanly?	Reformulate when...	Why
Soups and stews	Yes, to 5x+	Rarely — only when reducing to a glaze	Liquid-dominant recipes are forgiving. Evaporation is the only variable, controlled by pan width and time.
Yeasted breads	Yes, to 3x	Above 3x, switch to baker's percentages and batch	Dough mass traps fermentation heat. Larger batches over-proof before the center catches up.
Cookies and bars	Yes, to 2x	Above 2x, batch instead of scaling — butter-to-leavening ratio drifts at scale	Leavening and fat interact nonlinearly. Spread, texture, and rise all shift.
Cakes (chemical leaven)	Caution above 1.5x	Above 2x — different pan geometry changes bake physics entirely	Batter depth, surface crust formation, and leavening gas escape all depend on pan shape.
Custards and emulsions	Yes, to 2x	Above 2x — heat penetration becomes unreliable	Egg-set temperature is precise. Thicker custard means the outside overcooks before the center sets.
Stir-fries	No, beyond 1x	Always batch. A wok has a fixed thermal surface.	Crowding drops the wok temperature below the Maillard threshold. You steam instead of sear.
Marinades and brines	Proportional to protein weight	When switching container shape (depth changes coverage)	Ratio to protein matters, not absolute volume. A deeper vessel needs less liquid per gram of meat.
Sourdough	Yes, to 2x	Above 2x — adjust starter percentage and ferment time independently	Starter activity is biological, not linear. Larger dough ferments faster due to thermal mass.

Scale-multiply vs. batch-split: choosing the right strategy

You have two paths when making more food: scale one big batch, or run the original recipe multiple times. The right answer depends on what you are making and how much more you need.

Multiplier	Strategy	Best for	Avoid for
1.25x–2x	Scale directly, adjust leavening and seasoning per the table below	All recipe types except stir-fry	Delicate souffles, choux pastry
2x–3x	Scale with adjustments. Split into two pans for baked goods.	Soups, braises, yeasted breads, pasta sauces	Cakes, meringues, anything whipped
3x–5x	Batch-split. Mix dry ingredients in bulk, then portion and add wet per standard batch.	Everything. This is how professional kitchens operate.	Nothing — this strategy is universally safe
5x+	Batch-split mandatory. Convert to weight-based formulas (baker's percentages for bread, ratio systems for sauces).	Event catering, meal prep, production baking	Never attempt a single 5x+ batch of anything leavened

The advantage of batch-splitting: every batch uses the exact ratios, pan sizes, and cook times you already know work. The risk of scaling: you are running an experiment at volume. If it fails, you lose all the ingredients, not just one batch.

Nonlinear ingredient adjustments: what to change after using the scaler

Take the scaler output as your base, then apply these corrections. The percentages below represent how much of the scaled quantity you should actually use.

Ingredient	1.5x–2x	3x–4x	5x+	Why it breaks
Baking powder	Use 100%	Use 80%	Use 60–70%	CO₂ oversaturates batter, causing collapse after initial rise. See the leavening agents guide for the chemistry.
Baking soda	Use 100%	Use 75%	Use 50–60%	Excess leaves metallic taste; browning accelerates past Maillard into burning.
Active dry yeast	Use 100%	Use 85%	Use 70–80%	Larger dough mass retains fermentation heat, accelerating activity beyond target proof.
Salt	Use 100%	Use 80–90%	Use 70–80%	Saltiness perception compounds nonlinearly. Larger volumes also concentrate salt during reduction.
Chili, cayenne, hot sauce	Use 75–90%	Use 60–75%	Use 50%	Capsaicin perception is logarithmic. Double the flakes is not double the heat.
Vanilla extract	Use 100%	Use 85%	Use 75%	Alcohol-based extracts intensify at concentration; aromatic compounds saturate perception.
Garlic	Use 100%	Use 80%	Use 65–75%	Allicin concentration compounds. Raw garlic especially becomes overpowering.
Thickeners (cornstarch, roux)	Use 100%	Use 90%	Use 80%	Viscosity is not linear — a 5x batch thickened at 5x becomes paste.
Gelatin	Use 100%	Use 100%	Use 100%	Gelatin scales linearly — setting is a direct protein-to-liquid ratio.

Temperature stays constant. Time does not.

This is the single most common scaling mistake: adjusting oven temperature for a bigger batch. Do not. A doubled cake at 175°C still bakes at 175°C. What changes is time, and it changes less than you think. Consult the cooking temperatures guide for target internal temperatures — those never change regardless of batch size.

Scale factor	Same pan (deeper fill)	Proportionally larger pan	Multiple pans
1.5x	+15–20% time	+5% time	Same time
2x	+25–35% time	+10–15% time	Same time
3x	Not recommended	+15–25% time	Same time (rotate pans halfway)

For stovetop work, the variable is surface-area-to-volume ratio. A wider pot keeps cook times similar. A deeper pot with the same diameter requires significantly more time and risks uneven cooking. When in doubt, go wider, not taller.

Scaling down: halving is harder than doubling

Most cooks think of scaling as "making more." But halving a recipe for solo cooking or testing a new formula introduces problems that scaling up does not.

Egg division — 3 eggs halved is 1.5 eggs. Beat the egg, weigh it (a large egg without shell is approximately 50g), use half by weight. Do not eyeball it.
Leavening at micro scale — below ⅛ tsp, home measuring spoons are unreliable. Use a digital scale at 0.1g precision: 1 tsp baking powder ≈ 4.6g, 1 tsp baking soda ≈ 4.6g.
Minimum viable batch — bread dough below 200g flour is difficult to knead. Custard below 1 cup liquid heats unevenly. Know the floor for your recipe category.
Yeast at small scale — instant yeast below ¼ tsp is unreliable by volume. Weigh it (¼ tsp ≈ 0.8g), or use a preferment to distribute yeast activity more evenly. The sourdough starter guide covers natural leavening as an alternative for small batches.

Weight-based scaling eliminates compounding error

Volume measurements introduce error at every scale. One cup of flour weighs anywhere from 120g to 160g depending on technique. At 1x, the recipe absorbs that variance. At 4x, the error compounds to ±160g — nearly a full extra cup. If your source recipe uses cups and tablespoons, convert to weight before scaling. The unit converter on Lab Heritage handles metric-imperial conversion for any ingredient.

For bread at any multiplier above 2x, convert to baker's percentages first: every ingredient expressed as a percentage of total flour weight. Decide your flour weight, calculate everything else. The bread hydration guide covers this system in detail for dough-based recipes.

Scaling for groups: dietary restrictions compound at volume

Scaling for events introduces a problem that solo cooking never hits: dietary overlap. When you scale a recipe from 4 to 40 servings, the probability that someone in the group has an allergy, intolerance, or dietary restriction approaches certainty. This is not just about substitution — it is about cross-contamination in shared prep space. If you are scaling for a group that includes restricted diets, review the allergen cross-contamination guide before you start cooking. Separate prep surfaces, utensils, and serving vessels matter more at scale, not less.