The kitchen calculators
you actually need.
Free, instant, no signup. Get the right ratios, conversions, and scaling for whatever you're making.
Coffee
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Baking
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Cooking
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Altitude
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Coffee Ratio Calculator
The right grams of coffee for any brew method.
500g water · French Press
→ 31g coffee · 1:16 ratio
Pan Size Converter
Substitute any baking pan with confidence.
9" round → 8" square pan
→ Scale recipe to 0.95×
Recipe Scaler
Double, halve, or scale by any factor.
4 servings → 8 servings
→ Multiply every ingredient by 2.0×
High Altitude Adjustment
For baking above 3,000 ft.
Recipe at 5,280 ft (Denver)
→ +25°F · +2 tbsp liquid · less leavening
Why KitchenMath
Cooking is half intuition, half measurement. The intuition you build over years. The measurement you can fix in 30 seconds — once you have the right tool.
This site is just the calculators. No 1,500-word origin story before you can find the answer. No newsletter popup. No "click to reveal." Just the math, with explanations underneath if you want them.
— Maya