Calculators

Free, honest math for home cooks, growers, and small food businesses. Scale recipes, price a CSA share, estimate yield, plan macros — 113 tools, no signup required.

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Food & Cooking

Everyday kitchen math — scale recipes, convert units, plan meals, nail ferments.

Recipe Scaler
Scale any recipe up or down — halve it, double it, or fit a specific serving count with the original yield intact.
Kitchen Unit Converter
Convert between grams, ounces, cups, and tablespoons — with ingredient density for accurate volume-to-weight swaps.
Oven Temperature Converter
Convert between Fahrenheit, Celsius, and UK Gas Marks — with a "best for" hint for every temperature.
Baking Substitutions
Out of eggs, butter, or milk? Get scaled substitute amounts and notes on how each swap changes your bake.
Pan Size Conversion
Swap pans without wrecking a recipe — get the ingredient multiplier and bake-time adjustment between any two pan sizes.
Yeast Converter
Convert between active dry, instant, and fresh yeast — with baker’s percentage when you give flour weight.
Sourdough Starter Feeding
Compute flour, water, and ripe time for any starter feed ratio and target hydration.
Brining Calculator
Salt and water amounts for wet or dry brining, plus recommended brine times by protein.
Pickling Brine Calculator
Vinegar, water, salt, and sugar amounts for quick fridge pickles or shelf-stable canning — with pH safety check.
Meal Prep Cost
Add up ingredient costs for a batch of prepped meals — see cost per meal, per person, and a weekly projection.
Roast Time by Weight
Oven roast times by cut, weight, and doneness — with USDA safe internal temps and rest times.
Smoking Time by Cut
Low-and-slow smoke times by cut and pit temperature — with stall and wrap recommendations.
Safe Meat Thawing
Thaw time by method (fridge, cold water, microwave) with USDA food-safety windows.
Butter Yield from Cream
How much butter (and buttermilk) a given cream volume produces, with optional salt math.
Cheese Yield from Milk
Expected cheese weight by milk type and cheese style — fresh, semi-hard, aged.
Bone Broth Ratio
Bones, water, vinegar, and simmer time for a target yield of beef, chicken, or pork broth.
Jam Pectin Ratio
Sugar, pectin, and lemon juice ratios for low-sugar to traditional jam — by fruit pectin level.
Fermentation Time
How long to wait for kraut, kimchi, hot sauce, or kombucha — adjusted for your room temperature.
Dough Hydration
Baker percentage math for flour, water, salt, and levain — get the ratios right every bake.
Marinade Ratio
Oil, acid, salt, and sugar amounts per pound of meat — with marinade time by protein type.
Cure Salt Calculator
Prague Powder #1 and #2 amounts for bacon, ham, and charcuterie — with USDA nitrite ppm guardrails.
Turkey Size per Guest
Pounds of turkey per guest with leftovers — plus thaw time and fresh-vs-frozen decision guide.
Ham Size per Guest
Spiral, boneless, and fresh ham sizing with cooking time and carving yield.
Candy Temperature Stages
Sugar-cook stages from thread to hard crack — with altitude adjustment.
Canning Processing Time
USDA boiling-water-bath times by recipe, jar size, and altitude — with safety guardrails for low-acid foods.

Farm & Producer

Production, pricing, and planning math for growers, bakers, and makers.

Shop & Stock

Bulk-buying math for real life — hanging vs take-home weight, freezer fit, meat per person.

Craft & Design

Maker math for woodworking, sewing, soap, candles, pottery, leather, jewelry, and design.

Business & Pricing

Pricing, margin, and break-even math for small food businesses.

Nutrition

Daily energy, macros, and hydration for healthy eating plans.

Sustainability

Footprint, waste, and composting math for greener kitchens.