Recipe Scaler

Scale any recipe up or down by servings. Enter your ingredients, set the new serving size, and get perfectly scaled amounts with smart fraction display.

Free to use. Runs in your browser.

To scale a recipe, multiply every ingredient by the same factor. If you're doubling, multiply by 2; if halving, by 0.5. Liquids and solids scale identically by weight. Baking times change non-linearly, larger cakes need 25-40% more time at the same temperature; smaller items need less.

Paste your recipe below, we'll scale every ingredient and flag baking time adjustments.

Recipe Scaler

Original Servings

Multiplier

×2

New Servings

Quick:

Load example recipe

Ingredients

Amount	Unit	Ingredient	Scaled
			4 cups
			2 cup
			1 cup
			4
			2 tsp

Scaling 4 → 8 servings, every ingredient multiplied by ×2.Tip: When doubling or more, consider reducing salt and spices by 10-20% from the calculated amounts. Leavening agents (baking powder, baking soda) should be reduced by 10-25%.

Why Recipe Scaling Isn't Just Simple Maths

Scaling a recipe sounds simple: if a recipe serves 4 and you need 8, just double everything. But in practice, some ingredients don't scale linearly. Salt, spices, leavening agents (baking powder, baking soda, yeast), and fat behave differently at different volumes. Understanding when to scale exactly and when to adjust is the difference between a good cook and a great one.

This tool handles the maths, multiplying every ingredient proportionally to your target servings, but the sections below explain when you should override the maths and use your judgement instead.

Ingredients That Scale Perfectly

These ingredients can be multiplied or divided directly with no adjustment needed.

Category	Examples	Why They Scale
Flour & Starches	Plain flour, bread flour, cornstarch	Structural, proportional to final volume
Sugar	Granulated, brown, icing sugar	Flavour and structure are proportional
Liquids	Water, milk, stock, juice	Hydration ratio must stay constant
Butter / Oil	Butter, olive oil, coconut oil	Fat ratio affects texture proportionally
Eggs	Whole eggs, yolks, whites	Binding and structure are proportional
Vegetables & Fruit	Onions, tomatoes, berries	Bulk ingredients, scale directly
Pasta, Rice, Grains	Penne, basmati rice, oats	Serving-based portions
Meat & Fish	Chicken breast, salmon fillet	Protein per person, scale directly

Ingredients That Need Adjustment When Scaling

These are the problem ingredients. Our calculator scales them mathematically, but you should apply the adjustments below.

Ingredient	Scaling Up (2× or more)	Scaling Down (½ or less)	Why
Salt	Use 75-80% of the calculated amount	Use the full scaled amount	Perception doesn't scale linearly, double the volume doesn't need double the salt
Baking powder	Use 80-90% of calculated	Use full amount	Too much leavening makes baked goods collapse. Excess CO₂ escapes.
Baking soda	Use 75% of calculated	Use full amount	Excess makes a soapy, metallic taste. Less forgiving than baking powder.
Yeast	Use 80% of calculated	Use full amount	More yeast = faster rise = less flavour development. Reduce and allow longer rise.
Chilli / Hot spices	Use 50-75% of calculated	Use full amount or slightly more	Heat compounds at higher concentrations. Start low, taste, adjust.
Garlic	Use 75-80% of calculated	Use full amount	Raw garlic intensifies. Cooked garlic mellows but can still overpower.
Vanilla / Extracts	Use 75% of calculated	Use full amount	Alcohol-based extracts concentrate. Too much makes food taste bitter.
Cooking time	Increase by less than proportional	Reduce slightly	More food takes longer to heat through, but not proportionally.

Scaling Multiplier Guide

Common scaling ratios and what they mean in practice.

×0.5 (Half)

Perfect for cooking for 1-2 people. Most ingredients halve cleanly. For baking: use 1 small egg or half a beaten large egg.

×1.5 (One and a Half)

The trickiest multiplier. Fractions get messy, ¾ cup × 1.5 = 1⅛ cups. This calculator handles it for you.

×2 (Double)

Most reliable scale-up. Nearly everything doubles cleanly. Reduce salt/spices by 10-20%. Check your pan/tin is large enough.

×3 (Triple)

Start reducing leaveners to 75-80% of calculated amount. Cooking time increases but NOT by 3×. Consider splitting into batches.

×0.25 (Quarter)

Very small batches. Spoon measurements become tiny (¼ tsp → 1/16 tsp). Consider using a scale for accuracy.

×4+ (Quadruple)

Batch territory. Split into separate batches for baking. For stovetop: use a larger pot and increase heat slightly to compensate.

How to Scale Eggs

Eggs are the hardest ingredient to scale because you can't use "half an egg" in its shell form. Here's a practical guide.

Recipe Says	Scaled Amount	What to Do
1 egg	0.5 egg	Beat 1 egg, measure half (~25g or 1½ tbsp). Save the rest for an egg wash.
1 egg	1.5 eggs	Use 1 whole egg + 1 yolk (adds richness), OR beat 2 eggs and use 75% (~75g).
2 eggs	3 eggs	Use 3 eggs, this scales cleanly.
1 egg	0.25 egg	Use 1 egg yolk only (~18g). It provides the binding without excess liquid.
3 eggs	1 egg	Use 1 whole egg, it'll be slightly less rich but structurally fine.

Pro tip: 1 large egg ≈ 50g total (30g white + 18g yolk + 2g shell). Beat the egg, weigh what you need, and refrigerate the rest for up to 2 days.

Baking vs Cooking: Different Scaling Rules

Cooking (Soups, Stews, Curries, Stir-fries)

Cooking is forgiving. You can scale up or down freely and adjust as you go. Taste constantly, add more salt/spice gradually, and let the dish tell you what it needs. The biggest risk when scaling up is not using a large enough pan, overcrowding causes steaming instead of browning. Use a wider pan or cook in batches.

Baking (Cakes, Bread, Pastry)

Baking is chemistry. The ratio of flour to liquid to fat to leavener to eggs determines whether your cake rises, your bread has structure, and your pastry flakes. When scaling baking recipes:

Scale flour, sugar, butter, milk, and eggs proportionally, these are structural
Reduce leavening agents (baking powder, soda) by 10-25% when doubling or more
Use weight (grams) instead of volume (cups) for precision, our cups to grams converter helps
Adjust baking time: check 5-10 minutes early when scaling up, 5 minutes early when scaling down
For large batches (3× or more), split into separate tins/batches rather than one giant one

Pan Size Guide for Scaled Recipes

When you scale a baking recipe, you often need a different tin size. This table shows equivalent pan volumes.

Pan Size	Volume	Serves	Scale Factor
6" round (15cm)	3.5 cups / 830ml	4-6	×0.5
8" round (20cm)	6 cups / 1.4L	8-10	×1 (standard)
9" round (23cm)	8 cups / 1.9L	10-12	×1.3
10" round (25cm)	10.5 cups / 2.5L	12-16	×1.75
8×8" square (20cm)	8 cups / 1.9L	9-12	×1
9×13" rectangle (23×33cm)	14 cups / 3.3L	12-16	×1.75
12-cup muffin tin	⅓ cup each / 80ml	12	Per cup
9×5" loaf (23×13cm)	8 cups / 1.9L	8-10	×1

8 Tips for Scaling to Large Batches

1. Cook in batches, not one giant pot

Two pans of sautéed onions will brown. One overcrowded pan will steam and go soggy.

2. Taste at every stage

Seasoning doesn't scale linearly. Add salt and spices gradually, taste, and adjust.

3. Use weight over volume

3 cups of flour can be 375g or 480g depending on how you scoop. 375g is always 375g.

4. Reduce leaveners by 10-25%

Too much baking powder = collapsed cake with a soapy taste. Less is safer.

5. Allow more cooking time

A double batch of soup needs more time to reach temperature, but not double the time.

6. Prep everything before starting

Mise en place is important for 4 servings; it's essential for 20.

7. Check your oven capacity

Two cake tins side by side need 2" clearance from walls and each other for even heat.

8. Write down what you did

When scaling, note your actual amounts. If it works, you have a tested recipe at the new scale.

Related Cooking Tools

Cups to Grams Converter

Convert volume to weight for 200+ ingredients

Cooking Measurement Converter

Convert cups, tbsp, tsp, ml, fl oz & more

Air Fryer Converter

Convert oven recipes to air fryer settings

Meat Temperature Chart

USDA safe temps and doneness levels

Weight Converter

Convert kg, lbs, oz, and more

How to use this tool

Enter your original recipe's serving count

Set the new number of servings you need

Add your ingredients with amounts and units

Common uses

Scaling a family recipe for a dinner party or buffet
Halving a recipe when cooking for one or two
Adjusting a US cup-based recipe to UK / Australia metric quantities
Converting a baking recipe to match your tin or tray size
Building a batch-cooking meal plan from a favourite recipe

Share this tool

Frequently Asked Questions

How do I scale a recipe from 4 servings to 6?

Enter 4 as the original servings and 6 as the new servings. The tool will multiply every ingredient by 1.5× (6÷4). For example, 1 cup of flour becomes 1½ cups, 2 eggs become 3 eggs, and 1 tsp of salt becomes 1½ tsp.

Can I halve a recipe?

Yes, enter the original servings and set the new servings to half. The tool handles fractions automatically: 1 cup becomes ½ cup, 3 tbsp becomes 1½ tbsp. For eggs, beat the whole egg and measure half (~25g or 1½ tbsp).

Do I need to adjust baking powder when doubling?

Yes. When doubling or tripling a baking recipe, reduce baking powder by 10-20% and baking soda by 20-25% from the calculated amount. Too much leavener makes baked goods rise too fast then collapse, and can leave a soapy taste.

Should I adjust cooking time when scaling?

For stovetop cooking, slightly longer, a larger volume takes more time to heat through. For baking, add 5-15 minutes when doubling (check with a skewer). When halving, check 5-10 minutes early. Temperature usually stays the same.

How do I handle half an egg?

Beat the whole egg, then measure 25g (1½ tbsp) for half an egg. Alternatively, use 1 egg yolk for roughly half (it provides binding without excess liquid). Save the remaining egg white for an egg wash or freeze it.

Can I triple or quadruple a recipe?

You can, but consider splitting into batches for baking. In a pan or pot, cooking in batches prevents overcrowding. Reduce leavening agents by 20-25% and salt/spices by 15-20% when tripling or more, they don't scale linearly.

Why do fractions appear instead of decimals?

Recipes traditionally use fractions (½ cup, ¼ tsp) because they match standard measuring tools. Our tool shows fractions when the result is close to a standard fraction (⅛, ¼, ⅓, ½, ⅔, ¾) and decimals otherwise.

Can I scale by a custom multiplier instead of servings?

Yes, the tool calculates the multiplier as new servings ÷ original servings. If you want a 2.5× multiplier, set original to 2 and new to 5 (or any numbers that give the ratio you want).

What units does this support?

Any unit, cups, tablespoons, teaspoons, grams, ml, ounces, pounds, litres, and count-based units (pieces, cloves, slices). The tool scales the number regardless of unit, since all scaling is proportional.

Is my recipe data saved anywhere?

No. Everything runs in your browser. Your recipe is not sent to any server, stored, or tracked. When you close the page, it's gone.

Results are for general informational purposes only and should be checked before use. They are not professional advice. See our Disclaimer and Terms of Service.