Health calculators
BMI, BMR, body fat, calorie needs, ideal weight, water intake and pregnancy due date, with the formula and its limits stated.
8 tools · free · no account · nothing uploaded
All 8 health tools
BMI Calculator
Calculate body mass index in metric or imperial units and see the WHO category range for the result.
Open toolCalorie Calculator
Estimate basal metabolic rate and daily calories for maintenance, weight loss or weight gain.
Open toolDue Date Calculator
Estimate the due date from your last period and cycle length, with current week and trimester.
Open toolBMR Calculator
Calculate basal metabolic rate and daily calorie needs at five activity levels.
Open toolJ to cal
Convert joules to calories instantly. 1 J = 0.2390057 cal, with a live result and a quick reference table.
Open toolWater Intake Calculator
Estimate a daily water target from body weight and exercise minutes. The common guide is 33 ml per kilogram plus extra for exercise; this tool applies both.
Open toolIdeal Weight Calculator
Estimate ideal body weight with the Devine and Robinson formulas. Both formulas start from 60 inches of height and add weight per additional inch, adjusted for sex.
Open toolBody Fat Calculator
Estimate body fat percentage from tape measurements with the US Navy formula: waist, neck and height, plus hip for women.
Open toolWhat these health tools cover
Screening numbers, not diagnoses. BMI, basal metabolic rate, body fat estimates, daily calorie needs, ideal weight, water intake and a pregnancy due date, each computed with a published formula. Every page states what the number does and does not tell you — BMI, for instance, ignores muscle mass and body composition — so it is a starting point for a conversation with a clinician, not a substitute for one.
Common jobs
- Estimating daily calories before adjusting a diet
- Checking a BMI range against published categories
- Working out a due date from the last menstrual period
Why they run on your device
These pages are static files. The work is done by JavaScript in your tab, so a file or a password never leaves your machine — there is no upload endpoint on this site to send it to. That also means no account, no usage counter and no queue.
Questions
Is this medical advice?
No. These are estimates from standard formulas. A clinician who knows your history is the only source that can interpret them for you.
Why does BMI disagree with my body fat?
BMI uses only height and weight, so a muscular person can read as overweight. Body fat and waist measurements give a different picture.