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Healthy Waist Size for 170 cm Height (Waist-to-Height Ratio)
For an adult 170 cm tall, NICE suggests keeping your waist under 85 cm (33.5 in): half your height. See the increased and high risk sizes too.
Waist-to-height ratio
A quick check of fat around the middle. NICE says: keep your waist to less than half your height.
Your waist-to-height ratio
How to measure your waist
- Find the bottom of your ribs and the top of your hips.
- Wrap a tape measure around your middle, halfway between them.
- Breathe out naturally and measure. Don't pull the tape tight.
✅ Rules last checked:
📚 Official sources: NICE NG246: Overweight and obesity management (waist-to-height ratio)
We build every tool from the official rules and re-check them when they change. Always confirm with the official source before you rely on a result.
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Waist sizes at 170 cm
NICE's simple message: keep your waist to less than half your height. At 170 cm, that's under 85 cm (33.5 in). Measure halfway between your lowest rib and the top of your hip, breathing out normally.
| Ratio | Waist | Meaning |
|---|---|---|
| 0.4–0.49 | 68–85 cm (26.8 in–33.3 in) | Healthy |
| 0.5–0.59 | 85–102 cm | Increased risk |
| 0.6 or more | 102 cm or more | High risk |
For adults with a BMI under 35. Not for pregnancy. A screening check, not a diagnosis.
Questions people ask
Why waist and not just BMI?+
Fat around the middle is more closely linked to type 2 diabetes and heart disease. NICE suggests using waist-to-height ratio alongside BMI.
Does it work for everyone?+
It's for adults with a BMI under 35, including people with a lot of muscle. It's not for pregnancy.