Spices & salt
Flavor doesn't scale perfectly. When doubling or tripling, start with about 1.5× the original seasoning and adjust to taste. Cayenne, cloves and other strong spices deserve extra caution.
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RecipeScaler Free Online Recipe Scaler & Servings Converter
100% Free, Browser-Based Recipe Scaler & Ingredient Quantity Converter.
Recipe scaling calculator
Scale factor
×2
4 → 8 servings
Understands 3, 1.5, 3/4, 1 1/2, ½, ranges like 2-3, and units like cups, tbsp, tsp, oz, lb, g, kg, ml, l. Lines like "Serves 4" are updated too.
Scaled recipe
Your recipe never leaves this device — all scaling runs locally in your browser.
RecipeScaler key features
RecipeScaler is a free, 100% client-side recipe scaler online that scales recipe servings, adjusts ingredient quantities and converts cooking units — securely, inside your browser.
Servings converter
Enter original and target servings — every ingredient is rescaled instantly.
Cooking multiplier tool
One-tap ¼×, ½×, 2×, 3×, 4× or any custom factor such as 1.25 or 2/3.
Smart ingredient parsing
Reads fractions, mixed numbers, unicode ½, decimals, ranges and units like cups, tbsp, tsp, oz, lb, g, ml.
Clean fractions or decimals
Results snap to kitchen-friendly measures (1/4, 1/3, 1/2…) and simplify units (12 tsp → 1/4 cup).
Metric & US conversion
Convert a whole recipe to grams and milliliters, or to cups, ounces and pounds.
Private & shareable
No uploads, no sign-up. Copy, export as .txt, print or share a link.
How to scale a recipe for more or fewer servings
Scaling a recipe comes down to one number: the scale factor. Divide the servings you want by the servings the recipe makes, then multiply every ingredient by that factor. Going from 4 to 6 servings is a factor of 1.5; halving a recipe is 0.5; doubling is 2. RecipeScaler reads each ingredient line, finds the quantity and unit, multiplies it, and writes it back as a clean kitchen-friendly fraction or decimal.
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1. Paste your ingredients
One ingredient per line. Section headings and lines like "salt to taste" are kept exactly as they are.
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2. Choose servings or a multiplier
Enter original and target servings, or tap ½×, 2×, 3× — or type a custom factor like 1.25 or 2/3.
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3. Pick fractions, decimals & units
Smart simplify turns awkward amounts like 12 tsp into ¼ cup, and one click converts the whole list to metric or US units.
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4. Copy, export or share
Copy the scaled recipe, export it as a .txt file, print a clean card, or share a link that rebuilds it.
Tips for scaling spices and liquids accurately
Liquids
Stocks and sauces scale linearly, but large batches lose proportionally less liquid to evaporation. For big soups and braises, hold back 10–15% of the liquid and add it if needed.
Leaveners & eggs
Baking soda, powder and yeast scale fine for small changes. For fractional eggs, beat and measure: 1 large egg ≈ 3 tbsp (about 50 g).
Pans & timing
Scale pan area by the same factor to keep depth the same. Keep oven temperature unchanged and start checking for doneness early.
Weigh when baking
A cup of flour can weigh 120–150 g depending on how it's scooped. For baking, convert to grams and use a kitchen scale for repeatable results.
Package sizes
In lines like "1 (14 oz) can tomatoes" only the leading count is scaled — the package size in brackets stays, so you know which can to buy.
How do I convert baking measurements?
These are the standard US customary equivalents RecipeScaler uses for unit-aware scaling and metric conversion. Volume-to-weight conversions (like cups of flour to grams) depend on the ingredient, so the tool converts volume to milliliters and weight to grams.
| US measure | Equals | Metric |
|---|---|---|
| 1 tsp | — | 4.9 ml |
| 1 tbsp | 3 tsp | 14.8 ml |
| 1/4 cup | 4 tbsp | 59 ml |
| 1/3 cup | 5 tbsp + 1 tsp | 79 ml |
| 1/2 cup | 8 tbsp | 118 ml |
| 1 cup | 16 tbsp · 8 fl oz | 237 ml |
| 1 pint | 2 cups | 473 ml |
| 1 quart | 4 cups | 946 ml |
| US measure | Equals | Metric |
|---|---|---|
| 1 oz | — | 28.35 g |
| 4 oz | 1/4 lb | 113 g |
| 8 oz | 1/2 lb | 227 g |
| 1 lb | 16 oz | 454 g |
| 2.2 lb | 35.3 oz | 1 kg |
| 1 stick butter | 8 tbsp · 1/2 cup | 113 g |
Frequently asked questions
How do I scale a recipe for more or fewer servings?
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Divide the number of servings you want by the number of servings the recipe makes to get the scale factor, then multiply every ingredient by it. For example, 4 → 6 servings is a factor of 1.5, so 2 cups of flour becomes 3 cups. With RecipeScaler you just paste the ingredients and enter both servings numbers — every quantity updates instantly.
How do I convert baking measurements?
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3 teaspoons = 1 tablespoon, 16 tablespoons = 1 cup, 1 cup ≈ 236.6 ml, 1 ounce ≈ 28.35 g and 1 pound ≈ 453.6 g. Choose "Convert to metric" or "Convert to US" in the Units menu to convert an entire ingredient list at once. For baking, weighing dry ingredients in grams is the most accurate method.
What are the best tips for scaling spices and liquids accurately?
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Scale spices and salt conservatively — start at about 1.5× when doubling, then taste and adjust. Liquids scale linearly, but large batches evaporate proportionally less, so hold back a little liquid in big soups and stews. Leaveners scale well for small changes; very large batches may need slightly less.
How should I handle eggs when scaling a recipe?
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RecipeScaler flags fractional counts like 1 1/2 eggs with a rounding hint. Round to a whole egg for forgiving recipes, or beat an egg and measure: one large egg is about 3 tbsp (≈50 g), the yolk about 1 tbsp and the white about 2 tbsp.
Do I need to change pan size and baking time?
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Yes — scale the pan's area by the same factor so the batter stays the same depth, keep the oven temperature the same, and check for doneness early. A doubled cake in a deeper pan needs more time; a halved one needs less.
What ingredient formats does RecipeScaler understand?
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Whole numbers (3 eggs), decimals (1.5 tsp), fractions (3/4 cup), mixed numbers (1 1/2 cups), unicode fractions (½ cup), ranges (2-3 cloves or 2 to 3 cloves) and attached metric units (200g butter). It also updates "Serves 4" or "Makes 12" lines. Lines without a quantity are left untouched.
Is RecipeScaler free and private?
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Yes. It's 100% free with no account. Everything runs locally in your browser with JavaScript — your recipes are never uploaded to any server. Share links store the recipe inside the link itself.