Health & Body
Nutrition & Cooking Calculators
Macros, hydration, recipe scaling and kitchen conversions. Free calculators with formulas and worked examples.
Macros and calories
Macro CalculatorTurn a daily calorie target into grams of protein, carbohydrate and fat, using a preset split or your own percentages.Keto Macro CalculatorEnter your calorie target, carb limit and protein goal to get keto macros in grams.Protein Intake CalculatorHow much protein should you eat each day?Glycemic Load CalculatorCombine glycemic index and portion size into glycemic load.Daily Fibre Intake CalculatorHow much fibre should you aim for?Sugar Grams to Teaspoons ConverterSee how much sugar is in a product in spoonfuls and as a share of your calories.Meal Calorie Split CalculatorSpread your daily calories across the day.
Hydration
Meal timing
Drinks
Caffeine Half-Life Calculator (Caffeine Left in Your System)Enter how much caffeine you had and when, to see how much is left.Alcohol Calorie Calculator (Calories from Alcohol)Enter the drink size, its alcohol percentage and how many you have.Alcohol Units CalculatorHow much alcohol is in your drink?
Nutrition targets
Kitchen conversions
Cups to Grams CalculatorConvert cups of flour, sugar, butter and more into weight.Cooking Measurement ConverterConvert any US kitchen volume measure.Recipe Scaling CalculatorResize a recipe from one serving count to another.Oven Temperature ConverterConvert a recipe temperature and adjust for a fan oven.
Cooking times
Turkey Roasting Time CalculatorA planning estimate for roasting a turkey. The bird is done when the thickest part reaches 74 °C (165 °F).Bread Hydration and Baker's Percentage CalculatorWork out the true hydration of your dough.Coffee to Water Ratio CalculatorFind the coffee dose for your brew.Recipe Cost per Serving CalculatorDivide a recipe's cost into servings and check your margin.Rice and Pasta Portion CalculatorPlan quantities of rice or pasta for your guests.BBQ and Party Food Quantity CalculatorHow much food do you need for your guests?
About these calculators
Plan meals and scale recipes with confidence. These tools estimate macros and hydration, convert kitchen measures and help you scale recipes up or down. Nutrition needs vary between people, so treat the results as starting points.
Each calculator explains its formula, includes a worked example and lists its sources. Read how we check them on our editorial policy page, or browse all calculators.
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Please note: TheCalcTools gives general estimates for information and education. It is not financial, medical, legal or tax advice, and results should be checked before you make a decision. See our disclaimer and about page.