1. CDC Adult BMI
The reference standard with official category cutoffs.
Pros
- Authoritative WHO/CDC bands
- Child and teen percentile version
Cons
- BMI only, no body-fat context
Best for: Checking the official classification · Price: Free
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4 researched picks · 4 with a free tier · Last reviewed 2026-09-18
Research method: official pricing/feature pages checked against the comparison criteria below. No hands-on lab testing is claimed.
Best BMI calculator alternatives: CDC Adult BMI — The reference standard with official category cutoffs. It is also fully free. Runner-up free pick: NHS BMI. Compare all 4 below.
BMI alone is a blunt instrument: it cannot tell muscle from fat, and athletes regularly land in overweight bands while being metabolically healthy. Better alternatives pair the index with body-fat estimates, waist ratios or BMR context.
Use BMI as a screening flag, then confirm with one of the richer tools below before drawing any conclusion about health.
| Tool | Price | Free tier | Best for |
|---|---|---|---|
| 🏛️CDC Adult BMI | Free | Checking the official classification | |
| 🇬🇧NHS BMI | Free | UK users following NHS guidance | |
| 🧬Omni BMI + Body Fat | Free | Seeing beyond the single number | |
| 💪Calculator.net Fitness | Free | One-stop fitness baseline numbers |
No numeric scores are shown — there is no disclosed reproducible scoring system. Order reflects editorial comparison on the criteria above; sponsored rows are highlighted but payment never buys position.
The reference standard with official category cutoffs.
Pros
Cons
Best for: Checking the official classification · Price: Free
UK reference with healthy-weight range guidance.
Pros
Cons
Best for: UK users following NHS guidance · Price: Free
BMI plus body-fat and waist-ratio context.
Pros
Cons
Best for: Seeing beyond the single number · Price: Free
BMI, BMR, body fat and calorie needs combined.
Pros
Cons
Best for: One-stop fitness baseline numbers · Price: Free
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