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CrumbCalc

14 free calculators · every diagram to scale

Baking math, solved instantly

Pan sizes, cups to grams, recipe scaling, oven temperatures — the conversions every baker hits, answered as you type. No sign-up. Nothing leaves your browser.

Try the pan converter All 14 calculators

🍪 Baking tip of the day

The same cake serves two different crowds: a 10-inch round is 28 party slices but 38 wedding slices, because wedding portions are cut slimmer (1 × 2 in vs 1½ × 2 in).

Servings for every size →

New tip every day — all from the sourced charts our tests pin.

🗂 Your kitchen

Every result you save — a scaled recipe, a pan conversion, tonight's oven temperature — waits here on this device, ready mid-bake. No account, nothing leaves your browser.

Open your recipe box →

Baking for the holidays? The seasonal hub has the whole lineup.

Pan & size

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Cake Pan Converter

Convert any recipe between pan sizes — see both pans drawn to scale with batter fill levels, plus adjusted bake time and temperature.

Cake Serving Calculator

How many people does your cake feed? Party and wedding serving counts for round, square and sheet cakes — single or tiered — from the Wilton chart.

Pan Volume Calculator

How much does your pan hold? Get the exact volume of any baking pan in cups, millilitres and litres, plus the batter it takes at a two-thirds fill.

Frosting Calculator

How much frosting does your cake need? Cups of buttercream by pan size, layers and coat thickness — computed from the cake's actual surface, with a cupcake swirl mode.

Ingredients & measurements

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Cups to Grams Converter

Convert cups, tablespoons and ounces to grams for 40+ baking ingredients using tested ingredient densities. Instant and accurate.

Butter Converter

Convert butter between sticks, cups, tablespoons, grams and ounces — every equivalent at once, drawn to scale as sticks.

Recipe Scaler

Paste a recipe and scale it to any number of servings. Smart fractions, unit-aware, works with cups, grams and ounces.

Cookie Exchange Calculator

Guests × dozens each ÷ your recipe's yield: how many cookies and batches to bake for a cookie swap, with spares and bowl-splits worked out.

Baking Substitutions

Out of buttermilk, cake flour or eggs? Exact, scaled substitutions for 14 baking staples — measured swaps with the caveats that matter.

Bread & dough

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Baker's Percentage Calculator

Convert any bread recipe to baker's percentages, or scale a formula to any batch — by flour weight, total dough or number of loaves. Both directions, exact.

Sourdough Hydration Calculator

Calculate your sourdough's true hydration in baker's percentages — correctly counting the flour and water inside your starter — and hit any target hydration.

Yeast Converter

Convert between fresh, active dry and instant yeast by weight — with packet counts. The standard 1 : 1.25 : 3 ratio, done for you.

Oven & temperature

High Altitude Baking Calculator

Adjust any recipe for elevation: oven temperature, sugar, liquid and leavening, applied to your own amounts — straight from the Colorado State Extension tables.

Oven Temperature Converter

Convert between Fahrenheit, Celsius, gas marks and fan (convection) oven temperatures with one click.

Baking math, explained

All guides →

Pan-size conversion guide

The complete method for adapting any cake recipe to the pan you actually own: scaling by volume, adjusting bake time and temperature, and the conversions that don't work.

Doubling a recipe

Doubling ingredients is the easy part. Pans, bake times, leavening, spices and eggs each follow different rules — here's each one, with the math done for you.

Grams vs cups

The same cup of flour can weigh 120 g or 150 g depending on who scoops it — enough to change a cake. What the variance is, and how to switch to weighing.

Thanksgiving math

How many pies for your table, how to scale one crust recipe to a holiday batch, and how to sequence pies, sides and a turkey through one oven — worked out, not guessed.

High-altitude baking

Why thin air breaks sea-level recipes, what the published adjustment tables actually say, and how bread, cookies, candy and frying each behave differently above 3,000 feet.

Buttercream math

Why frosting charts all disagree, the three surfaces that actually determine the amount, and how to turn cups-needed into batches of your own recipe — with the calculator built in.

Christmas cookie math

How many batches for the cookie exchange and the gift list, how to triple a dough in one bowl, and the freezer schedule that moves December's baking into November.

Baking calculators that respect the chemistry

Baking is chemistry, and chemistry runs on ratios. Swap an 8-inch pan for a 9x13, halve a cookie recipe, or follow a European recipe written in grams, and the ratios shift — that's where cakes sink, cookies spread, and bread refuses to rise. CrumbCalc exists to make those adjustments exact instead of approximate.

Every tool here is built on published test-kitchen data: pan capacities from standard manufacturer measurements, ingredient weights following the King Arthur Baking chart that US test kitchens treat as the reference, and the international gas mark and fan-oven conventions. The math runs entirely on your device — pages load fast, work offline after the first visit, and nothing you type ever leaves your browser.

Start with the cake pan converter — the only one we know of that draws both pans to scale and adjusts bake time by batter depth. Baking for the holidays? The Christmas & holiday hub gathers the season's tools — cookie-swap counts, gift-batch scaling, party-cake sizes — in one place. New calculators ship every month.