Sizu 
Fraction Calculator
Add, subtract, multiply or divide two fractions — mixed numbers in, reduced fraction out.
What this book teaches
The maths that a kitchen actually asks of you: halving, doubling and adding the fractions on every measuring cup; converting between cups, grams, millilitres, ounces and both temperature scales; scaling a recipe to however many people turned up — and knowing which ingredients do not scale straight; reading a nutrition label honestly, including the serving size that flatters it; working out what a dish really costs per plate and what a week of groceries can cover; timing a whole meal backwards from when you want to eat; and the mental shortcuts that work with floury hands and no calculator. Every recipe in the book is plant-based. Series brand: Math Didn't Have To Be This Hard.
Free tools for this book
Kitchen Unit Converter
Cups, tablespoons, teaspoons, millilitres, grams, ounces and °F ↔ °C, with exact factors.
Recipe Scaler
Scale by servings; amounts come back as kitchen fractions, with salt and leaveners held back.
Nutrition Label
Correct the label for what you really ate, cross-check the 4-4-9 macros, compare per 100 g.
Unit-Price Comparator
Price ÷ quantity across items — see which can, jar or bag is genuinely cheaper per unit.
Cooking Time & Temperature
Work backwards from serving time to a start time per dish; convert the oven dial both ways.
Mental-Math Drill
Timed practice on the halving, doubling and 10% shortcuts the chapter teaches.
Kitchen Math Toolkit
All seven kitchen-math tools, gathered and sized to print. No sign-up.
All chapters
- 1Kitchen Fractions
- 2Measurements & Conversions
- 3Recipe Scaling & Ratios
- 4Nutrition Labels & Macros
- 5Meal Planning & Budgeting
- 6Cooking Times & Temperature
- 7Kitchen Mental Math