Calculators & charts

Free and no sign-up: the calculators run in your browser and save nothing. Each one shows how it calculates, with sources.

Food & health

Calorie calculator: Basal metabolic rate and total energy expenditure with a worked example.
Calorie deficit calculator: 300 to 500 kcal below your needs, never under 1,200 or 1,500 kcal.
Protein calculator: Protein a day by weight and goal.
Nutrient calculator: Zinc, iron, magnesium, iodine & co. a day (DGE 2025).
Water intake calculator: How much to drink a day, from the DGE values with weight and age.
BMI calculator: BMI and waist-to-height ratio, honestly explained.
Calories burned calculator: Exercise and steps, with a MET chart.
Nutri-Score calculator: A to E from the values on the label, 2024 formula.

Cups to grams converter: Cups, tablespoons and teaspoons to grams for flour, honey, oil and more.
Cake tin size converter: Scale ingredients for round and rectangular tins, with a chart.
Fresh to dried yeast converter: Fresh yeast to dried yeast and back, with a chart.
Oven to air fryer converter: Temperature and time for your oven recipe, by type of food.
Microwave wattage converter: Convert the time on the pack to your microwave, 600 to 1,000 watts.
Air fryer cooking times: How long vegetables, chips, chicken and fish take in the air fryer, with temperatures.
Seasonal calendar (Germany): What’s in season in Germany, month by month.