About CookToolbox
CookToolbox is a growing collection of free cooking and kitchen calculators that run entirely in your web browser. Convert oven recipes for the air fryer, scale a recipe up or down, dial in pizza-dough hydration, plan smoking times, and more — all instantly, with no signup and nothing to install.
Built and tested by a cook
Every calculator is built from tested kitchen ratios and standard references, not guesswork.
Mara has spent 12+ years developing and testing recipes — baking sourdough, dialling in pizza dough hydration, and smoking briskets low and slow. Every calculator here is built from tested ratios and standard references (USDA FoodData Central, King Arthur Baking).
Why in your browser?
Many cooking sites are slow, cluttered with pop-ups, and bury a simple calculation under a long story. Our tools do the maths on your device the instant you type — fast, distraction-light, and private. Once a page has loaded it even works offline.
Accuracy & sources
Ingredient weights and densities are based on USDA FoodData Central and King Arthur Baking; cooking times and temperatures follow widely used standards. Ovens, ingredients and equipment vary, so treat every result as a reliable starting point and always cook to doneness — see our disclaimer.
New tools are added regularly. Have a request or found a bug? Email [email protected] or visit the contact page — we read everything.