Numbers help, as long as you know what they can and cannot tell you. Each calculator below runs entirely in your browser (nothing you type is stored or sent anywhere) and explains the result, the formula behind it and the next sensible step.
Calorie CalculatorEstimate maintenance calories and a sensible deficit.TDEE CalculatorSee how BMR and activity add up to daily energy use.Protein CalculatorA daily protein range for your weight and goal.Macro CalculatorSplit calories into protein, carbs and fat.BMI CalculatorBody mass index with what it can and cannot tell you.Weight Loss Goal CalculatorA realistic timeline for a weight goal.Water Intake CalculatorA rough daily fluid target for your size and activity.
Which calculator should I use first?
- Calorie calculator: your estimated maintenance calories and a sensible deficit. Start here if you want to lose weight.
- Protein calculator: a daily protein range for your weight and goal, split per meal.
- Macro calculator: turns your calorie target into grams of protein, carbs and fat.
- Weight loss goal calculator: a realistic timeline for your goal weight.
How accurate are these calculators?
They use well-established population equations, such as Mifflin-St Jeor for resting metabolism. For most adults the estimate lands within about 10% of measured values, but individuals vary. Treat every result as a starting point: follow it for two to three weeks, watch your weight trend, then adjust.