# Convertisseur de taille et poids : cm en pieds et pouces, kg en stones

> Convertissez la taille entre cm et pieds et pouces, et le poids de kg en livres ou en stones et livres, avec le pouce défini exactement à 2.54 cm.

Version interactive : https://www.calcopenly.com/fr/conversion/height-weight-converter
Sujet : Convertisseurs d’unités

A height in centimetres becomes feet and inches by dividing by 2.54 cm per inch, rounding to the nearest inch and splitting into feet of 12 inches. A body weight in kilograms becomes pounds by dividing by 0.45359237 kg per pound, and stones and pounds by rounding to the nearest pound and splitting into stones of 14 pounds.

The default, 180 cm and 75 kg, gives 5 ft 11 in (70.87 in) and 165.3 lb, or 11 st 11 lb. Typing 5 ft 11 in or 11 st 4 lb straight into the fields works the other way.

Both factors are exact by the 1959 international yard and pound agreement, so the only approximation is the rounding to whole inches and pounds, which carries upward: 71.85 in shows as 6 ft 0 in, not 5 ft 12 in.

## Données

- **Hauteur**: Accepts 5'11" or 5 ft 11 in
- **Weight**: Accepts 11 st 4 lb

## Résultats

- Height in feet and inches — résultat principal
- Hauteur (cm)
- Height in inches (in)
- Weight (kg)
- Weight in pounds (lb)
- Weight in stones and pounds

## Formule

$$
\begin{gathered} 1\ \text{in} = 2.54\ \text{cm},\quad 1\ \text{ft} = 12\ \text{in} \\ 1\ \text{lb} = 0.45359237\ \text{kg},\quad 1\ \text{st} = 14\ \text{lb} \end{gathered}
$$

## Exemples détaillés

### 180 cm and 75 kg

- Hauteur: 180 cm
- Weight: 75 kg
- **Height in feet and inches: 5 ft 11 in**
- **Height in inches: 70.87 in**
- **Weight in pounds: 165.3 lb**
- **Weight in stones and pounds: 11 st 11 lb**
- Source de vérification : 180 / 2.54 = 70.866 in → 71 in = 5 ft 11 in; 75 / 0.45359237 = 165.347 lb = 11 st 11.35 lb (Python fractions)

### 5 ft 11 in and 11 st 4 lb

- Hauteur: 5 ft 11 in
- Weight: 11 st 4 lb
- **Hauteur: 180.3 cm**
- **Weight: 71.67 kg**
- **Height in feet and inches: 5 ft 11 in**
- Source de vérification : 71 × 2.54 = 180.34 cm; 158 lb × 0.45359237 = 71.66759446 kg (NIST HB 44)

### Rounding carries to the next foot and stone

- Hauteur: 182.5 cm
- Weight: 13 st 13.6 lb
- **Height in feet and inches: 6 ft 0 in**
- **Weight in stones and pounds: 14 st 0 lb**
- Source de vérification : 182.5 / 2.54 = 71.85 in → 72 in = 6 ft 0 in; 13 st 13.6 lb = 195.6 lb → 196 lb = 14 st 0 lb

### Exactly 5 feet

- Hauteur: 152.4 cm
- Weight: 75 kg
- **Height in feet and inches: 5 ft 0 in**
- **Height in inches: 60.00 in**
- Source de vérification : 152.4 / 2.54 = 60 in exactly

## Questions

### How tall is 180 cm in feet and inches?

5 ft 11 in. 180 cm ÷ 2.54 = 70.87 in, which rounds to 71 in, and 71 in is 5 × 12 + 11. Six feet (72 in) is exactly 182.88 cm; with rounding to the nearest inch, any height from 181.61 cm (71.5 in) upward shows as 6 ft 0 in.

### Comment convertir des pieds et pouces en centimètres ?

Turn the height into inches, then multiply by 2.54. 5 ft 11 in is 5 × 12 + 11 = 71 in, and 71 × 2.54 = 180.34 cm. The factor is exact: the 1959 international yard and pound agreement fixed the inch at 2.54 cm, so any error comes only from how many decimals you keep.

### How many pounds are in a stone?

14 pounds, so one stone is exactly 6.35029318 kg (14 × 0.45359237 kg). A weight of 11 st 4 lb is 158 lb, or 71.67 kg. The stone remains in customary use for body weight in the United Kingdom and Ireland, and for weigh-ins in boxing and horse racing there.

### What is 75 kg in stones and pounds?

11 st 11 lb. 75 kg ÷ 0.45359237 kg/lb = 165.35 lb, which rounds to 165 lb; 165 = 11 × 14 + 11, so the weight is 11 stone 11 pounds. In pounds alone it is 165.3 lb, and 12 stone (168 lb) would be 76.2 kg.

### Quelle est la précision de « Convertisseur de taille et poids : cm en pieds et pouces, kg en stones » ?

La précision dépend de vos données et des hypothèses de la méthode. Le calcul décimal utilise 50 chiffres significatifs, mais les estimations, méthodes numériques et données sources peuvent être moins précises ; l’arrondi affiché ne supprime pas ces limites. Exemples résolus vérifiés à partir de sources indépendantes : 4. Par exemple, « 180 cm and 75 kg » est vérifié à l’aide de 180 / 2.54 = 70.866 in → 71 in = 5 ft 11 in; 75 / 0.45359237 = 165.347 lb = 11 st 11.35 lb (Python fractions).

### D’où vient cette méthode ?

NIST Handbook 44, Appendix C — inch, foot, pound and stone.

## Sources

- [NIST Handbook 44, Appendix C — inch, foot, pound and stone](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)