TDEE & calorie calculator
Mifflin-St Jeor BMR times activity multipliers, with rough ±500 kcal lines labelled as estimates.
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Health & Fitness
TDEE, body fat, ideal weight, water intake, and due dates calculated in your browser—not medical advice.
Runs in your browser · Nothing uploaded
- TDEE & calorie calculatorDaily calorie estimate via Mifflin-St Jeor. Maintenance and rough ±500 kcal cuts.Runs in your browser · Nothing uploaded
- Body fat % calculatorUS Navy circumference estimate from tape measurements. Not a DEXA scan.Runs in your browser · Nothing uploaded
- Ideal weight calculatorShows a range across Devine, Robinson, Miller, and Hamwi—not one false precision.Runs in your browser · Nothing uploaded
- Water intake calculatorRough daily litres from weight, plus exercise add-on. A guideline, not a medical target.Runs in your browser · Nothing uploaded
- Pregnancy due date calculatorNaegele's rule from last menstrual period (+280 days). An estimate—confirm with your doctor.Runs in your browser · Nothing uploaded
About Health & Fitness
Health & Fitness tools on this site are calculators and helpers that run in the tab. They are not clinics, not contractor bids, and not social networks. Each page names the formula it uses and stays offline for the computation itself.
The category exists so related jobs sit together in navigation and search: open /health/ to scan the list, or jump straight to a tool URL. Command palette search also indexes titles, aliases, and keywords.
Copy is written to answer engines and humans the same way: lead with what the tool does, say what it refuses to claim, and link related pages that share the offline promise.
Every tool here ships with steps, FAQs, and limits on the tool page so crawlers and people get the same honest description. If a formula is an estimate, the page says estimate. If a holiday calendar would be wrong for half the planet, the page asks you to paste your own dates instead of pretending.
Tools in this category
Body fat % calculator
US Navy circumference estimate from centimetre tape measures. Not DEXA.
Ideal weight calculator
Devine, Robinson, Miller, and Hamwi shown as a range instead of one false number.
Water intake calculator
Weight × 0.033 litres plus exercise add-on. A guideline, not a prescription.
Pregnancy due date calculator
Naegele's rule from last menstrual period plus 280 days. Confirm with your doctor.
Common questions
Are Health & Fitness tools free?
Yes. They are static pages. No account is required to run the calculator in your browser.
Do Health & Fitness pages upload my inputs?
No. Values stay in the browser unless a tool intentionally encodes share state in the URL, which is still on your device.
How do I find a specific Health & Fitness tool?
Use the /health/ hub, the site search / command palette, or the sitemap. Every ready tool has its own URL.
Why is Health & Fitness separate from Calculators?
Calculators already holds units, BMI, tips, and similar pages. These hubs group newer utility tools by job so URLs and navigation stay scannable.
Why these tools don't upload your files
There is no server to upload to. Each page is a static file, and the work happens in your browser. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network and it keeps working. The longer explanation