Recipe Scaler
Scale recipes up or down for any servings
About the Calculator
Recipe scaling should not mean guesswork or wasted ingredients. Paste your full ingredient list, set original and target servings, and get every quantity scaled automatically — including fractions like ¼ cup and ¾ teaspoon. The tool handles whole numbers, decimals, unicode fractions, and mixed amounts like 1 1/2. Lines without a leading quantity (section headers, "salt to taste") are left unchanged. Perfect for meal prep, holiday cooking, or resizing family recipes. Use the Recipe Scaler to get a clear result you can act on right away. This calculator is designed to be practical, fast, and easy to use on any device.
How to Calculate Manually
- 1Enter the original number of servings your recipe makes
- 2Enter how many servings you want to make
- 3Paste your ingredient list — one ingredient per line
- 4Review scaled amounts; copy the list when ready to cook
Scale factor
×1.50
4 servings → 6 servings
Supports whole numbers, fractions (¼, 1/2), and mixed amounts. Notes in parentheses are preserved.
The Formula
Examples
Example 1: Meatballs for a family of five (recipe serves 4)
A meatball recipe written for 4 servings needs to stretch to 6 for a hungry household. Scale factor: 6 ÷ 4 = 1.5. Paste the ingredient list and you get: 1 pound ground beef → 1 ½ pounds; ¼ cup breadcrumbs → ⅜ cup; ¾ teaspoon salt → 1 ⅛ teaspoon; 2 tablespoons parsley → 3 tablespoons. Parenthetical notes like "(could sub with half ground pork)" stay on the line — only the leading numbers change.
Example 2: Dinner party chili (serves 6, feeding 10)
Your go-to weeknight chili feeds 6. Ten friends are coming and you want one pot, not two separate batches. Scale factor: 10 ÷ 6 ≈ 1.67. Two pounds ground beef becomes 3 ⅓ pounds; one 28-oz can crushed tomatoes becomes roughly 1.67 cans (about 46 oz — use one large and one small can in practice); 2 tablespoons chili powder becomes 3 ⅓ tablespoons. Paste the full list so every line updates together instead of doing mental math on each spice.
Example 3: Meal prep — doubling a 2-serving sheet-pan dinner
A sheet-pan lemon chicken recipe serves 2. You want four lunches for the week, so you double it: scale factor 2.0. One chicken breast per serving becomes 2 breasts total; 1 tablespoon olive oil → 2 tablespoons; ½ teaspoon dried oregano → 1 teaspoon; juice of ½ lemon → juice of 1 lemon. Same pan may be tight at 2× — use two sheet pans or a larger one and add a few minutes to roast time.
Example 4: Cooking for one — halving Grandma's 8-serving lasagna
The family lasagna recipe makes an 8-serving tray. You live alone and want a small batch: scale factor 0.5. One pound ricotta → ½ pound; 3 cups marinara → 1 ½ cups; 12 lasagna noodles → 6 noodles; 2 cups shredded mozzarella → 1 cup. Use an 8×8 dish instead of 9×13 and check doneness 10–15 minutes earlier — thinner layers cook faster.
Example 5: Thanksgiving stuffing (12 servings → 18 at the table)
A classic stuffing recipe serves 12. With extra relatives, you need 18: scale factor 1.5. One loaf cubed bread (about 12 cups) → 18 cups (roughly 1 ½ loaves); 1 cup butter → 1 ½ cups; 2 cups chicken broth → 3 cups; 1 tablespoon poultry seasoning → 1 ½ tablespoons. Stuffing in a deeper dish may need longer in the oven; aim for 165°F internal temperature regardless of scale.
Tips & Strategies
When scaling baking recipes, be cautious with leavening agents (baking soda/powder). they do not always scale linearly
Quick tip. For best results, use weight measurements when scaling significantly
Cooking times may need adjustment when scaling recipes. larger portions take longer
Spices and seasonings often need less scaling. start with less and taste as you go
Cross-check when the decision matters. Run a second scenario with rounded inputs or a different path to the same quantity so you do not rely on a single fragile chain of arithmetic.
Things Worth Knowing
- •Not everything scales linearly: when doubling a cake recipe, you cannot just double the baking time; a doubled recipe in a larger pan needs only 1.3-1.5x the time, while the same batter split into two pans takes the same time as the original, breaking the "just multiply everything" assumption.
- •The salt-does-not-double rule: professional chefs know that when you double a recipe, you only increase salt by 1.5x (not 2x) because salt's impact is not linear; doubling salt often makes food intolerably salty, which is why blind scaling fails for seasonings.
- •Halving recipes breaks ovens: when you halve a casserole recipe, you should reduce oven temp by 25°F and check 25% earlier; smaller volumes cook faster and edges overcook while centers undercook if you keep original temperature and time.
- •Restaurant recipes do not scale down: a restaurant recipe for 50 servings cannot simply be divided by 10 for home use; commercial ovens, mixers, and cooking vessels create different heat distribution, mixing patterns, and evaporation rates that dramatically change when scaled.
- •Yeast does not scale proportionally: when doubling bread dough, you only need 1.5-1.7x the yeast, not 2x; too much yeast creates off-flavors and over-proofing, while scaling down requires slightly more yeast than math suggests to maintain rise time.