Ingredients
Original pan
Target pan
Scaled Recipe
Scaling a Recipe with the Calculator
Paste your ingredient list exactly as you found it and the calculator handles the messy formatting for you. It reads a line whether it is written as “2 cups all-purpose flour”, “butter – 250g”, “Salt, 1/2 tsp”, “3 large eggs”, or “200g butter“, working out the quantity, unit, and ingredient on its own.
Set your original serving size and the size you need, and the math happens instantly. Tap a multiplier button for a common adjustment, or type exact numbers when you want precision.
Common Recipe Scaling Scenarios
Most adjustments are one of three moves. Halving suits cooking for two instead of four when a recipe makes too much for your household. Doubling covers a dinner party, a family gathering, or a week of meal prep. And odd ratios, like a recipe that serves four when you need six, just need the two serving numbers entered directly. In every case you either enter the original and target servings or tap a multiplier.
Quick Unit Reference
The calculator converts between metric and US imperial units automatically. Here’s the reference if you need to verify or do mental math:
| Volume (US) | Metric | Notes |
|---|---|---|
| 1 teaspoon | 5 ml | Standard measuring spoon |
| 1 tablespoon | 15 ml | 3 teaspoons |
| 1 cup | 237 ml | 16 tablespoons |
| 1 pint | 473 ml | 2 cups |
| 1 quart | 946 ml | 4 cups |
| Weight (US) | Metric | Notes |
|---|---|---|
| 1 ounce | 28 g | Small amounts of cheese, chocolate |
| 4 ounces | 113 g | 1 stick of butter |
| 8 ounces | 227 g | Half a pound |
| 1 pound | 454 g | 16 ounces |
For one-off conversions beyond this table, the milliliters to fluid ounces converter and the grams to ounces calculator give precise values in both directions, and the fluid ounces to cups converter covers liquid volume. Weight-to-volume switches for dry ingredients are different: 250 g of flour is 2 cups while 250 g of sugar is 1¼ cups, so use the grams to cups converter, which accounts for each ingredient’s density.
Scaling Baked Goods
Baking is chemistry, so a few things should not scale in a straight line once you go well past double. Cut baking powder and soda to about 0.9 times the strict multiple, since too much leaves a metallic taste. Scale salt and strong spices to roughly 0.75 to 0.9 times, because their flavor concentrates in a larger batch. Expect more volume to need a little longer at a slightly lower temperature, and start checking for doneness early. And bake in several pans rather than one oversized one, so the heat reaches the middle evenly.
Pan Sizes When Doubling or Halving
A scaled batter needs a pan to match, and pan capacity grows with area, not with the length printed on the tin. Multiply the two sides to compare: an 8 x 8 pan is 64 square inches, a 9 x 13 is 117, so moving between them is a 1.8× change, not 2×. Enter that number as the custom multiplier and the batter depth stays the same, which keeps bake times close to the original.
| From | To | Multiplier |
|---|---|---|
| 8 x 8 in square | 9 x 13 in | 1.8× |
| 8 x 8 in square | 9 x 9 in square | 1.25× |
| 9 x 13 in | 8 x 8 in square | 0.55× (about half) |
| 8 in round | 9 in round | 1.3× |
| 9 in round | 8 in round | 0.8× |
| 8.5 x 4.5 in loaf | 9 x 5 in loaf | 1.2× |
If the depth does change, adjust the oven instead of the clock first: shallower batter runs about 25°F hotter and shorter, deeper batter about 25°F cooler and longer, checking early either way. For cupcakes, one 9 in round layer fills roughly 12 standard cups and a 9 x 13 batch fills about 24.
Handling Eggs
Eggs don’t divide neatly. One large egg is about 50 g, or roughly 3 tablespoons once beaten, so for half an egg you beat one and measure about 1½ tablespoons, and for a third you measure about 1 tablespoon. For savory dishes, round to the nearest whole egg; for delicate baked goods where precision matters, beat the egg and measure out the portion you need.
Cost Tracking
Enable the cost calculator to see how scaling affects your grocery budget. Enter what each ingredient costs for the original recipe and the calculator multiplies those costs along with the quantities.
Because cost rises in step with quantity, the price per serving stays the same at any scale: a $12.50 recipe for four is about $3.13 a serving whether you double it to eight or halve it to two. What changes is the total outlay, which is usually what decides whether a dish is worth cooking on a given night. Sometimes doubling is more economical than making two separate dishes, and sometimes halving an expensive recipe is what makes it feasible for a Tuesday dinner.
Cooking Fractions
By default the calculator rounds to practical cooking fractions, the ones you can actually scoop: ⅛, ¼, ⅓, ½, ⅔, and ¾. Nobody measures ⅜ of a teaspoon, so a result like that snaps to the nearest usable fraction. If you need exact decimal values for professional or scientific work, turn off “Use cooking fractions” in the options.
Export Options
There are three ways to keep a scaled recipe. Copy puts plain text on your clipboard to paste into notes or messages. Print produces a clean recipe card with no interface clutter, just the ingredients. And choosing “Save as PDF” as the destination in the print dialog keeps a file for your recipe collection.
