Kg to Stone and Pounds – Complete NHS Conversion Guide
Converting kilograms to stone and pounds is a common need in the UK and Ireland, where body weight is still frequently measured in these traditional units. Whether you are checking your own weight against NHS guidelines, looking up a patient’s records, or simply understanding the numbers on a bathroom scale, knowing the exact conversion formula and the official NHS chart values can save time and prevent confusion.
The stone has been a standard unit of weight in Britain for centuries, and despite metrication, it remains the default for body weight in everyday speech and healthcare settings. This guide brings together the exact mathematics, the most searched-for conversions, and the official NHS chart equivalents so you can find what you need at a glance.
How Many Pounds Are in a Stone and How Many Kilograms in a Stone?
| 1 stone = | 14 pounds (exactly) |
| 1 stone = | 6.35029318 kg (exact) |
| 1 kg = | 0.15747 stone (approx) |
| NHS rounding | Chart often rounds to nearest 0.5 kg or nearest pound |
- Most UK health records require weight in stones and pounds; the kg-to-stone conversion is essential for patients.
- The exact conversion factor is 6.35029318 kg per stone; many tools use a rounded 0.15747 stone per kg.
- NHS PDF charts provide pre-calculated values but may not match exact conversion due to rounding.
- Common body weight conversions (50–100 kg) are the most searched: 60 kg, 75 kg, 80 kg, 85 kg.
- 1 stone = 14 pounds is an exact legal definition, confirmed by the UK Weights and Measures Act.
- The stone is still widely used in the UK and Ireland, especially when talking about body weight, according to stone-synergy.co.uk.
| Kilograms | Stones & Pounds (exact) | Stones & Pounds (NHS rounded) |
|---|---|---|
| 55 kg | 8 st 9.3 lb | approx 8 st 9 lb |
| 60 kg | 9 st 6.3 lb | approx 9 st 6 lb |
| 75 kg | 11 st 11.3 lb | approx 11 st 11 lb |
| 80 kg | 12 st 8.4 lb | approx 12 st 8 lb |
| 85 kg | 13 st 5.4 lb | approx 13 st 5 lb |
| 10 st | – | 63.5 kg exactly |
| 11 st | – | 69.85 kg |
| 12 st | – | 76.2 kg |
What Is 60 kg in Stone and Pounds? (Plus Other Common Conversions)
The most frequently searched body weight conversions fall between 55 kg and 85 kg. Using the exact formula – dividing kilograms by 6.35029318 – gives the following results:
| kg | Stones (decimal) | Stones & Pounds |
|---|---|---|
| 55 kg | 8.66 st | 8 st 9.3 lb |
| 60 kg | 9.45 st | 9 st 6.3 lb |
| 70 kg | 11.02 st | 11 st 0.3 lb |
| 75 kg | 11.81 st | 11 st 11.0 lb |
| 80 kg | 12.60 st | 12 st 8.4 lb |
| 85 kg | 13.39 st | 13 st 5.0 lb |
| 90 kg | 14.17 st | 14 st 2.4 lb |
Official NHS-linked PDFs, such as the University Hospitals Sussex weight conversion chart, often round to the nearest pound or half kilogram. For example, 60 kg may appear as 9 st 6 lb instead of 9 st 6.3 lb. This minor rounding is acceptable for general weight tracking but not for precise medical dosing.
What Is 10 Stone in Kilograms? (Common Stone-to-KG Lookups)
When you know your weight in stones and pounds and need the metric equivalent, the formula is straightforward: multiply stones by 6.35029318, and if pounds are included, add them after converting.
10 stone, 11 stone, 12 stone to kg
| Stone | Exact kg | Rounded kg (common use) |
|---|---|---|
| 10 st | 63.50 kg | 63.5 kg |
| 11 st | 69.85 kg | 69.9 kg |
| 12 st | 76.20 kg | 76.2 kg |
| 13 st | 82.55 kg | 82.6 kg |
For a rough conversion, multiply your weight in kilograms by 2.2 to get pounds, then divide by 14 to get stones and remaining pounds. For example, 62 kg × 2.2 = 136 lb, ÷ 14 = 9 stone 10 lb. This method matches the example from this instructional video.
How Does the NHS Weight Conversion Chart Work?
Several NHS organisations publish weight conversion charts in PDF format. These tables list kilograms in increments (often 0.5 kg or 1 kg) alongside the corresponding stones and pounds. The charts are designed for quick reference by clinicians and patients.
- The NHS Scotland community pharmacy chart includes combined weight and height conversions.
- The Healthy Weight Grampian chart (2017) covers a wide range of weights in a horizontal table.
- The UHSussex chart (March 2023) is one of the most recent NHS publications.
NHS charts sometimes round to the nearest half kilogram or whole pound. For example, 82 kg is listed as 12 st 13 lb in some charts, while the exact calculation gives 12 st 12.8 lb. This difference is rarely significant for routine weight monitoring but should be noted when high accuracy is required, such as in medication dosage calculations.
How Did the Stone Become a Standard Unit?
- ~1300s: Stone used as a standard trade weight in England, varying by commodity.
- 1835: British Weights and Measures Act defined the stone as 14 pounds.
- 1965: UK began metrication; stone remained in popular use for body weight.
- 1995: EU directive allowed continued use of stone alongside kg for body weight.
- 2024+: NHS continues to record weight in stones and pounds for patient compatibility.
The legal definition of the stone is codified in the Weights and Measures Act 1985, which confirms 1 stone = 14 lb exactly.
What Is Certain and Uncertain About Stone Conversion?
| Established information | Information that remains unclear |
|---|---|
| 1 stone = 14 pounds = 6.35029318 kg (exact by definition). | NHS conversion charts may round to the nearest pound or half kg; online tools vary in rounding. |
| The formula kg ÷ 6.35029318 gives exact stones. | For medical precision, use the exact conversion or the official NHS chart. For general weight tracking, NHS chart rounding is sufficient. |
Why Does the UK Still Use Stones and Pounds?
Users searching for this conversion are typically in the UK, Ireland, or other regions where stones are still used. The NHS, GPs, and clinics record weight in stones and pounds, causing patients to convert from metric scales. The conversion is straightforward but prone to error without a reliable tool.
According to stone-synergy.co.uk, “the stone is still widely used in the UK and Ireland, especially when talking about body weight.” Even though metric units are standard in most official contexts, people often say “I weigh 11 stone” or “I lost half a stone.” This cultural persistence is driven by habit, familiarity, and the sense that stone is a more natural unit for human body weight than kilograms.
Where Do the Official Conversion Values Come From?
“Weight conversion charts are provided for staff and patients to convert kilograms to stones and pounds quickly.”
UK National Health Service (NHS)
“The stone is defined as exactly 14 pounds avoirdupois.”
UK Weights and Measures Act (1835/1985)
The core conversion factor is maintained by international standards. The US National Institute of Standards and Technology (NIST) also documents the avoirdupois system in which the pound is defined.
What Should You Remember When Converting kg to Stone and Pounds?
When accuracy matters, such as for medication dosing or clinical records, use the exact formula: divide kilograms by 6.35029318. For everyday weight tracking, the rounded values in NHS charts – or the quick mental trick of multiplying kg by 2.2 then dividing by 14 – are perfectly sufficient. Whichever method you choose, the key relationships remain fixed: 1 stone = 14 pounds = 6.35029318 kg. For a related conversion, see our guide on 140 Lbs to Kg – Exact Conversion and Equivalents.
Frequently Asked Questions
How many pounds is 1 stone?
Exactly 14 pounds.
How many kilograms is 1 stone?
Exactly 6.35029318 kg.
What is the formula to convert kg to stone and pounds?
Divide kg by 6.35029318 to get stones (st). Multiply the decimal part by 14 to get pounds (lb).
Why does the NHS still use stones and pounds?
The NHS uses stones and pounds because they are the traditional units for body weight in the UK and many patients are more familiar with them.
Is 1 kg equal to 0.15747 stone?
Yes, that is a rounded approximation. 1 / 6.35029318 ≈ 0.157473 stone.
What is 90 kg in stone and pounds?
90 kg = 14 st 2.4 lb (approx 14 st 2 lb).
What is 55 kg in stone and pounds?
55 kg = 8 st 9.3 lb (approx 8 st 9 lb).
How do you convert stone and pounds to kg?
Multiply stones by 6.35029318, then add (pounds × 0.45359237).
What is the NHS weight conversion chart?
It is a PDF table that lists kilograms and their corresponding stones and pounds, used by clinicians and patients for quick reference.
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