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Free Calculators
Science-based, fast and free tools for your nutrition and health goals — no sign-up, and your data never leaves your device.
BMR Calculator
Basal metabolism & daily calories
Calculated 12,871 times OpenMacro Splitter
Protein · carb · fat gram breakdown
Calculated 9,760 times OpenBMI Calculator
Body mass index & healthy range
Calculated 13,545 times OpenIdeal Weight
Your ideal weight range for your height
Calculated 11,940 times OpenDaily Water Intake
How much water you need by weight and activity
Calculated 11,230 times OpenBody Fat Percentage
With a tape measure (US Navy method)
Calculated 7,920 times OpenCalorie Deficit
Daily calories & deficit for your goal
Calculated 10,480 times OpenProtein Needs
Your daily protein (g) target
Calculated 9,080 times OpenTDEE Calculator
Your total daily calorie burn
Calculated 8,510 times OpenWeight-Loss Timeline
How many weeks will it take to reach your goal, by what date, and with how big a daily calorie deficit?
Calculated 7,351 times OpenWaist-to-Height Ratio
Divide your waist by your height; the healthy limit is half your height (0.5). See your Ashwell risk band and your target waist.
Calculated 5,330 times OpenWaist-to-Hip Ratio
Work out your WHR from your waist and hip measurements and see your risk category against WHO thresholds by sex.
Calculated 4,940 times OpenFiber Needs
Calculate how many grams of fiber you need each day based on your daily calories.
Calculated 5,760 times OpenSugar Limit
Based on your daily calories, calculate the WHO free-sugar upper limit (10%) and ideal amount (5%) in grams and teaspoons.
Calculated 6,290 times OpenLean Body Mass
Estimate your lean body mass (muscle, bone, organs, water) and fat mass from your height and weight.
Calculated 4,610 times OpenPregnancy Weight Gain
Recommended total weight gain and weekly rate based on your pre-pregnancy BMI (IOM 2009).
Calculated 3,970 times OpenCalories Burned
Estimate the calories you burn by activity type, body weight and duration using the MET method.
Calculated 6,810 times OpenBody Surface Area
BSA (m²) with the Mosteller formula
Calculated 3,760 times OpenChild BMI Percentile
Child BMI percentile by age and sex
Calculated 4,280 times OpenFFMI Calculator
Height-adjusted lean muscle mass index
Calculated 3,611 times OpenBreastfeeding Nutrition
Daily calories, protein and fluid for a nursing mother
Calculated 3,490 times OpenAre you a dietitian?
Let NIdiet build your clients' calorie and macro plans automatically — unlimited clients, real USDA food data, appointments and progress tracking, all in one dashboard.