The NHS records your weight in kilograms. To change that figure into stone and pounds, divide the kilograms by 6.35029 to get stone, then multiply the decimal part by 14 to get pounds. A weight of 76 kg on your NHS record is 11 stone 13.6 pounds.
Kg to Stone Converter
Instant, accurate weight conversion
1 stone = 14 pounds = 6.35029 kg • 1 kg = 2.20462 lb
People search for “kg to stone and pounds NHS” after a GP visit, a health check or a letter from the hospital, when the number on the page is in kilograms and the number in their head is in stone. This guide explains how to switch between the two and what the figures mean for your health. It is an independent guide and is not run by the NHS.
Why does the NHS record weight in kg?
The NHS uses kilograms because medicine works in metric units. Doses, fluid amounts and body mass index are all worked out from kilograms, so recording weight the same way removes a step where mistakes could creep in.
A patient weighed in stone would need that figure converted before a nurse could work out a dose. Every extra sum is a chance for an error. Using one unit across every ward, clinic and surgery keeps records clear when you move between them.
The same rule applies to children. A baby’s weight is written in kilograms in the red book that parents receive after the birth, and growth charts use kilograms too. Many parents still think in pounds and ounces, which is why conversion questions come up from the first week of a child’s life.
How do you convert an NHS weight from kg to stone and pounds?
Divide by 6.35029, keep the whole number as stone, and multiply what is left by 14 for the pounds.
Say your clinic letter gives your weight as 82.4 kg:
- 82.4 ÷ 6.35029 = 12.976
- The whole number is 12, so you weigh 12 stone and a bit.
- 0.976 × 14 = 13.7
- Your weight is 12 stone 13.7 pounds.
That is only a fraction under 13 stone. If you had rounded 12.976 and read it as “12 stone 9”, you would have been more than 4 pounds out. The part after the decimal point is a share of a stone, and a stone has 14 pounds.
What does a kg to stone and pounds NHS chart look like?
A conversion chart lists kilograms in one column and stone and pounds in the next. The table below uses weights you might see on a clinic letter.
| Weight in kg | Stone and pounds |
| 48 kg | 7 st 7.8 lb |
| 52 kg | 8 st 2.6 lb |
| 57 kg | 8 st 13.7 lb |
| 62 kg | 9 st 10.7 lb |
| 66 kg | 10 st 5.5 lb |
| 71 kg | 11 st 2.5 lb |
| 76 kg | 11 st 13.6 lb |
| 83 kg | 13 st 1 lb |
| 88 kg | 13 st 12 lb |
| 93 kg | 14 st 9 lb |
| 98 kg | 15 st 6.1 lb |
| 104 kg | 16 st 5.3 lb |
| 112 kg | 17 st 8.9 lb |
| 125 kg | 19 st 9.6 lb |
If your weight sits between two rows, add 2.2 pounds for each extra kilogram. Our full kg to stone chart lists every kilogram from 40 to 150.
What is a healthy weight for your height in kg and stone?
For most adults, a healthy weight is one that gives a body mass index between 18.5 and 24.9. The table shows what that range looks like at different heights, in both units.
| Height | Healthy range in kg | Healthy range in stone and pounds |
| 150 cm (4 ft 11) | 41.6 to 56.0 kg | 6 st 8 lb to 8 st 11 lb |
| 155 cm (5 ft 1) | 44.4 to 59.8 kg | 7 st 0 lb to 9 st 6 lb |
| 160 cm (5 ft 3) | 47.4 to 63.7 kg | 7 st 6 lb to 10 st 0 lb |
| 165 cm (5 ft 5) | 50.4 to 67.8 kg | 7 st 13 lb to 10 st 9 lb |
| 170 cm (5 ft 7) | 53.5 to 72.0 kg | 8 st 6 lb to 11 st 5 lb |
| 175 cm (5 ft 9) | 56.7 to 76.3 kg | 8 st 13 lb to 12 st 0 lb |
| 180 cm (5 ft 11) | 59.9 to 80.7 kg | 9 st 6 lb to 12 st 10 lb |
| 185 cm (6 ft 1) | 63.3 to 85.2 kg | 10 st 0 lb to 13 st 6 lb |
| 190 cm (6 ft 3) | 66.8 to 89.9 kg | 10 st 7 lb to 14 st 2 lb |
These ranges are for adults. Children and teenagers are assessed differently, using their age and sex as well as height and weight. Pregnant women should not use these figures either.
How is BMI worked out from your weight in kg?
BMI is your weight in kilograms divided by your height in metres squared. This is one more reason kilograms are the standard unit in health care: the formula is built on them.
Take someone who weighs 71 kg and is 1.70 metres tall. Multiply 1.70 by 1.70 to get 2.89. Divide 71 by 2.89 and the BMI is 24.6, which sits inside the healthy range.
You do not have to do this by hand. The BMI calculator on the NHS website accepts weight in kilograms or in stone and pounds, and height in centimetres or feet and inches. It is the best place to check your own result, because it also takes account of age and ethnic background.
What do the BMI ranges mean?
For most adults, the ranges are:
- Under 18.5: underweight
- 18.5 to 24.9: healthy weight
- 25 to 29.9: overweight
- 30 to 39.9: obese
- 40 or above: severely obese
For people from Asian, Chinese, Middle Eastern, Black African or African-Caribbean backgrounds, lower limits are used. A BMI of 23 or more counts as overweight and 27.5 or more as obese, because health risks start at a lower weight for these groups.
BMI is a starting point and has limits. It cannot tell muscle from fat, so very muscular people can score as overweight. It can also miss extra weight around the waist. Your GP or practice nurse can look at the wider picture, including waist size.
How should you weigh yourself to match the clinic scales?
Weigh yourself at the same time of day, on the same scales, wearing little or nothing. Home readings rarely match clinic readings exactly, and that is normal.
A few habits make your numbers more reliable:
- Weigh first thing in the morning, after using the toilet and before breakfast.
- Put the scales on a hard, flat floor. Carpet can throw the reading off.
- Stand still with your weight spread evenly on both feet.
- Use the same scales every time.
- Weigh once a week and not every day, since daily ups and downs can be misleading.
At the surgery you are usually weighed in clothes, sometimes with shoes on, and often later in the day. That can add a kilogram or two compared with your morning reading at home. If the gap is much bigger, mention it to the nurse.
How do you convert a baby’s weight from kg to pounds and ounces?
Divide the kilograms by 0.4536 to get pounds, then multiply the decimal part by 16 to get ounces. Baby weights are given in pounds and ounces, not stone.
| Baby’s weight in kg | Pounds and ounces |
| 2.5 kg | 5 lb 8 oz |
| 3.0 kg | 6 lb 10 oz |
| 3.5 kg | 7 lb 11.5 oz |
| 4.0 kg | 8 lb 13 oz |
| 4.5 kg | 9 lb 15 oz |
So when the midwife says 3.5 kg and a grandparent asks “what’s that in old money?”, the answer is 7 pounds 11 and a half ounces.
What does a 5% weight loss look like in both units?
A 5% loss is your current weight multiplied by 0.05. Doctors often use this figure as a first target, because even a small drop can bring health benefits for people who are overweight.
For a person who weighs 90 kg (14 stone 2.4 pounds), 5% is 4.5 kg. In imperial terms that is just under 10 pounds. Their new weight would be 85.5 kg, or 13 stone 6.5 pounds.
Working this out in both units is useful if your GP sets a target in kilograms and your scales at home show stone.
Frequently asked questions
Is this an official NHS converter?
No. This is an independent website. The sums are standard and give the same results as any correct converter, but for medical advice you should use the NHS website or speak to your GP.
Does the NHS ever use stone and pounds?
Staff may tell you your weight in stone if you ask, and the online BMI tool accepts stone and pounds. Your medical record, though, is kept in kilograms.
Is there a printable kg to stone and pounds NHS chart?
Hospitals and surgeries sometimes have their own printed charts for staff. You can print the tables on this page, or use our full chart, for the same figures.
What is 100 kg in stone and pounds?
100 kg is 15 stone 10.5 pounds.
Why did my weight on the letter look higher than at home?
Clothes, shoes, a recent meal and the time of day can add up to a couple of kilograms. Different scales also give slightly different readings.
How many kilograms are in a stone?
There are 6.35 kg in a stone and 14 pounds in a stone.
What should you take away from this?
Your NHS record is in kilograms because that is the unit doctors and nurses work in. To read it in stone, divide by 6.35029 and turn the decimal into pounds by multiplying by 14. Keep a note of your weight both ways, and bring any worries about the number to your GP. To convert back, use our stone to kg converter.