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CrumbCalc

14 free calculators · every diagram to scale

Baking calculators & conversion tools

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 6-inch round is the smallest cake on our serving chart, and the one size on it where Wilton's party and wedding counts agree: 12 either way. On a cake that small, the two cutting patterns converge.

The 6-inch round →

New tip every day — each one restates a page on this site; follow the link for the source.

🗂 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? Wilton chart party and wedding counts for round, square and sheet cakes — single or tiered, two-layer or a single layer.

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 common baking staples — sourced swaps (King Arthur, Colorado State Extension) 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 a cake recipe for elevation: oven temperature, sugar, liquid and leavening, applied to your own amounts — from Colorado State Extension's cake-adjustment table.

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

Adapt any cake recipe to the pan you own: scaling by volume, adjusting bake time and temperature, and the pan swaps 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 up to 160 g depending on how it's scooped — enough to change a cake. How to switch to weighing.

Thanksgiving pies

How many pies for Thanksgiving: one 9-inch pie per 8 guests (Pillsbury's printed yield), or per 6 for big slices. Calculator and chart for 4–30 guests.

High-altitude baking

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

Buttercream math

Why frosting charts disagree, the three surfaces that set the amount, and how to turn cups-needed into batches of your own recipe — calculator included.

Christmas cookie math

Batches for the cookie exchange and the gift list, tripling 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 reference data, named on the page that uses it: standard pan capacities that match Joy of Baking's pan size chart, cake servings from Wilton's serving guide, ingredient weights from the King Arthur Baking chart, and the fan-oven reduction from Which?'s oven conversion table. 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.