Know your numbers
before you chase them.
BMI, BMR, daily calories, and water intake — worked out precisely, explained plainly, and logged the old-fashioned way. No account, no upsell, no wondering what happened to your data.
01
Body Mass Index
Weight relative to height, plotted on the standard adult scale, with a dial to show where you land.
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02
Basal Metabolic Rate
The energy your body burns at complete rest — the number every diet plan should start from.
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03
Daily Calorie Needs
Your BMR adjusted for how you actually move through the week, from desk-bound to twice-a-day training.
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04
Water Intake
A daily hydration target adjusted for your weight, the climate, and how hard you're training.
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Why another calculator site?
Most BMI tools bury the number in banner ads and pop-ups. Wellnum does one thing: takes your inputs, shows the working, and gets out of your way. Read more about the formulas and their limits in the journal.