Heights cause more unit confusion than almost any other measurement. A child's medical record may say 132 cm, a sports form may ask for feet and inches, and a parent may think in metres. This page solves both halves of the problem: it converts centimetres to feet and inches exactly, and it explains the growth chart that the converted number often ends up on.
The exact formula: 1 inch equals 2.54 cm
The conversion is not an approximation. Since 1959, one inch has been defined as exactly 2.54 centimetres, and one foot is exactly 12 inches. That gives you a two-step method that works for any height:
Step 1. Divide the height in centimetres by 2.54. That gives the total height in inches.
Step 2. Divide the total inches by 12. The whole number is feet, and the remainder is inches.
Example: 175 cm ÷ 2.54 = 68.90 inches. Then 68.90 ÷ 12 = 5 feet with 8.90 inches left over, so 175 cm is 5 ft 8.9 in — usually written as about 5 ft 9 in. Our converter at the top of this page does both steps instantly, in both directions, so you can also convert feet and inches back to centimetres.
The rounding mistake to avoid: there is no 5 ft 12 in
The most common conversion error happens at the last step. If the inches remainder rounds up to 12, you must carry it: 12 inches becomes one more foot and the inches return to 0. A result of '5 ft 12 in' is always wrong — it should be written as 6 ft 0 in. This matters in real forms and medical records, so our converter handles the carry automatically. If you are converting by hand, check any result with 11.5 inches or more twice.
Height conversion table: 140 cm to 200 cm
| Centimetres | Feet and inches | Centimetres | Feet and inches |
|---|---|---|---|
| 140 cm | 4 ft 7.1 in | 175 cm | 5 ft 8.9 in |
| 145 cm | 4 ft 9.1 in | 180 cm | 5 ft 10.9 in |
| 150 cm | 4 ft 11.1 in | 185 cm | 6 ft 0.8 in |
| 155 cm | 5 ft 1.0 in | 190 cm | 6 ft 2.8 in |
| 160 cm | 5 ft 3.0 in | 195 cm | 6 ft 4.8 in |
| 165 cm | 5 ft 5.0 in | 200 cm | 6 ft 6.7 in |
| 170 cm | 5 ft 6.9 in |
For heights not in the table — a child's exact measurement, for example — use the converter rather than guessing between rows. A difference of just 1 cm is about 0.4 inches, which is enough to change the rounded result.
What a child growth chart actually shows
A growth chart does not say how tall a child should be. It shows how a child's height compares with thousands of healthy children of the same age and sex, measured in large national studies such as those used for the CDC growth charts in the United States. The curved lines on the chart are percentiles, most commonly the 3rd, 10th, 25th, 50th, 75th, 90th, and 97th.
If a child is on the 50th percentile, half of children their age are taller and half are shorter — they are right in the middle. On the 75th percentile, about 75 out of 100 children are shorter and 25 are taller. On the 10th percentile, about 90 out of 100 are taller. None of those positions is 'good' or 'bad' by itself. A healthy child can grow steadily along the 10th percentile for years.
How to use a growth chart calculator sensibly
- Look at the trend, not one point. One measurement proves very little. A pattern of measurements over 6 to 12 months is what doctors actually read.
- Watch for crossing lines. Falling from the 60th percentile to the 25th over a year, for example, deserves a conversation even though both points look 'normal' alone.
- Compare with family height. A tall child of two short parents, or a short child of two tall parents, is worth reviewing — genetics and chart position should roughly agree.
- Measure the same way each time. Bare feet, standing straight, at roughly the same time of day. People are up to about 1–2 cm taller in the morning than in the evening.
Combine the two tools and you get the full picture parents usually want: the growth chart tells you where your child stands today, and a height predictor estimates where they may finish as an adult. One is a position; the other is a projection. Neither replaces a doctor who can see the whole pattern.
Frequently asked questions
How many cm are in a foot?
One foot is 30.48 cm, because 12 inches × 2.54 cm = 30.48 cm exactly.
What is 170 cm in feet and inches?
170 cm is 5 ft 6.9 in, usually rounded to about 5 ft 7 in.
What is 5 ft 9 in in cm?
5 ft 9 in is 69 inches in total, and 69 × 2.54 = 175.26 cm — about 175 cm.
Is the 50th percentile the ideal height?
No. The 50th percentile is just the middle. Most healthy children grow steadily somewhere between the 3rd and 97th percentiles, following their own line.
My child's percentile dropped. Should I worry?
A small move between check-ups is common and can be a measurement difference. A steady drop across two or more percentile lines over time is the pattern doctors want to see, so book a check-up and bring the earlier measurements.
Try it now: Type any height into the converter at the top of this page — cm to feet and inches, or feet and inches back to cm. No rounding traps, no 5 ft 12 in.
Disclaimer: This article and converter are for general information only and are not medical advice. Growth charts are a screening tool, not a diagnosis. If you are concerned about your child's growth, talk to your child's doctor.