Calculators

Health & fitness calculators

Fast, free tools for the numbers that matter, calories, macros, weight and more. Each one is backed by a recognised method and explained in plain language.

TDEE & Macros Your daily calories and a protein, carb and fat split for your goal. Open → Macro Calculator Protein, carbs and fat for your goal, with adjustable splits. Open → BMR The calories your body burns at complete rest. Open → BMI Body mass index and what the range means for you. Open → Ideal Weight A healthy weight range based on your height. Open → Protein How much protein you need each day. Open → Water Intake A daily water target from your weight and activity. Open → Body Fat Estimate body fat with a few tape measurements. Open → Calorie Deficit The daily deficit to lose weight at your chosen pace. Open → One-Rep Max Estimate your 1RM and training percentages. Open → Calories Burned Calories burned during exercise, by activity. Open →

Tools you can trust, explained in plain language

Most online calculators hand you a number and leave you guessing. welanutria does the opposite: every tool tells you which method it uses, what the result means, and how confident you can be in it. Our calculators draw on recognised, published formulas, the Mifflin-St Jeor equation for daily calories, the U.S. Navy method for body fat, and standard dietary references for protein and water, so you get answers grounded in real science rather than guesswork.

Whether you're working out how many calories you need, checking a healthy weight range, or dialling in your protein, each calculator works instantly in your browser with no sign-up. Pair them together for a fuller picture, start with your daily calories, then use the results to plan meals that fit. Remember that every result is an estimate for general guidance, not a medical diagnosis.