Converting kilograms to stones and pounds is a common need in the UK, where body weight is still often discussed in the imperial system. Whether you’re checking your weight for a doctor’s appointment, tracking fitness progress, or simply comparing numbers, understanding the relationship between these units is essential. This guide provides the exact conversion factors, official NHS chart references, and practical examples to make the process straightforward.
The stone remains the standard unit for body weight in the United Kingdom and Ireland, even as most other measurements have moved to metric. A stone is defined as exactly 14 pounds, and one stone equals 6.35029318 kilograms. Knowing these numbers allows you to convert any weight accurately, whether you’re using a calculator, a printed NHS chart, or doing the math by hand.
Below, we break down the most common questions people have when converting kg to stones and pounds, from the basic conversion factor to official health authority resources.
How many pounds in a stone?
1 Stone = 14 Pounds
Base conversion factor used in UK and Ireland for body weight.
1 Stone = 6.35 kg
Exact conversion factor: 6.35029318 kg per stone.
NHS Official Charts
Freely downloadable PDFs from NHS trusts showing kg to stone/pound equivalents.
Common Weight Examples
Quick look-ups: 60kg = 9st 6lb, 70kg = 11st 0lb, etc.
Key insights about the stone unit
- The stone (14 lb) is a traditional UK unit still used in health and fitness contexts.
- Most people searching for ‘kg to stones and pounds’ are tracking body weight for health or NHS appointments.
- Rounding is common: many charts round to the nearest half pound or whole pound.
- The NHS provides official conversion charts for patient use; these are highly authoritative for E-E-A-T.
- One stone is exactly 6.35029318 kilograms, as defined by the International System of Units (SI).
- The pound (0.45359237 kg) is the same unit used in the United States.
Quick reference: conversion factors
| Unit | Value | Notes |
|---|---|---|
| 1 Stone | 14 pounds | Avoirdupois system; used in UK, Ireland |
| 1 Stone | 6.35029318 kg | Exact conversion factor |
| 1 Pound | 0.45359237 kg | Used internationally |
| 1 kg | 2.20462 pounds | Common approximate value |
| 6 st 11 lb | 43.09 kg | Example from UHSussex NHS chart |
| 9 st 11 lb | 62.14 kg | Example from UHSussex NHS chart |
| 10 st 10 lb | 68.0 kg | From occupationalhealth.co.uk |
| 15 st 6 lb | 98.0 kg | From occupationalhealth.co.uk |
Kg to stone and pounds NHS
Several NHS trusts publish official weight conversion charts that map kilograms to stones and pounds. These are designed for clinical use, allowing healthcare professionals and patients to quickly convert between metric and imperial units. The charts typically list stones and pounds in one column with the corresponding kilograms in the next.
For example, the UHSussex NHS Trust Weight Conversion Chart (2023) includes values from 30 kg to 160 kg. Similarly, the NHS Healthy Weight Grampian PDF chart provides a comprehensive table for changing kilograms into stones and pounds.
If you are attending a UK clinic or GP practice, your weight may be recorded in kilograms internally, but you may be told the result in stones and pounds. You can request a printed copy of the NHS conversion chart to keep at home.
How NHS weight charts are structured
These charts are lookup tables, not body composition guides. They list weights in stones and pounds (rather than decimal stones) because that is the traditional UK body-weight format. Some charts present both systems side by side for immediate comparison.
60 kg in stone and pounds
One of the most common conversions people look for is 60 kilograms. According to The Calculator Site, 60 kg equals 9 stone and 6.3 pounds. In practice, many NHS charts round this to 9 stone 6 pounds. The same source shows that 70 kg is approximately 11 stone 0.3 pounds, often simplified to 11 stone 0 pounds.
Different converters may show slight variations. For instance, 70 kg is listed as exactly 11 stone 0 pounds in the Disabled World table, while the precise calculation gives 11 stone 0.3 pounds. Always check the rounding convention used by your source.
Other common kg values
- 10 kg = 1 stone 8 pounds (approx.)
- 55 kg = 8 stone 9 pounds (approx.)
- 75 kg = 11 stone 11 pounds (approx.)
- 100 kg = 15 stone 10 pounds (approx.)
- 120 kg = 18 stone 12 pounds (approx.)
10 stone in kg
Converting stones back to kilograms is equally straightforward. Since 1 stone equals 6.35029318 kg, 10 stones is exactly 63.5029318 kg. For practical use, this is often rounded to 63.5 kg. The UK Government guidance on weights and measures confirms the legal definitions of these units.
12 stone in kg
Twelve stones converts to 76.20351816 kg (12 × 6.35029318). Many health charts list 12 stone as approximately 76.2 kg. The same method applies to any stone value: multiply the number of stones by 6.35029318.
When converting from stones to kilograms, some online tools round to 6.35 kg per stone. This introduces a small error of about 0.0003 kg per stone, which is negligible for most everyday uses but may matter in precise medical contexts.
How did the stone measurement originate?
- Pre-14th century: Stone used as a local weight, varying by commodity and region.
- 1527: Standardisation: 1 stone = 14 pounds (wool trade).
- 1835: Imperial Weights and Measures Act confirms 14 lb stone.
- 1965: UK begins metrication, but stone remains common for body weight.
- 2000s: NHS adopts kg for clinical records but provides stone/pound charts for patient understanding.
What is certain and uncertain about kg to stone conversions?
| Established information | Information that remains unclear |
|---|---|
| 1 stone = 14 pounds exactly (avoirdupois). | Rounding varies by chart (e.g., to nearest pound, half-pound, or decimal). |
| 1 stone = 6.35029318 kg (exact conversion). | Some older charts may use 6.35 kg per stone (rounded). |
| NHS PDF charts are official and accurate for clinical reference. | Online calculators may use slight rounding differences. |
Why does the stone unit persist in the UK?
The stone is culturally embedded in UK health and fitness discourse. Even after metrication, people continue to think of their body weight in stones and pounds, and the NHS accommodates this by providing dual-system charts. Official NHS charts ensure consistency in patient communication across the country.
Online converters are convenient but should be cross-checked with official charts for medical accuracy. Understanding the conversion factor allows manual calculation without a chart. For those working with scientific or industrial measurements, the National Institute of Standards and Technology (NIST) – SI units provides authoritative metric definitions.
What sources confirm these conversion factors?
“Weight conversion chart: Change kg’s into stones and pounds”
— NHS Healthy Weight Grampian
“Weight Conversion Chart (2023)”
— UHSussex NHS Trust
“1 stone = 14 pounds; 1 stone = 6.35029318 kilograms”
— Disabled World
Additional authoritative sources include the Disabled World weight converter, which provides clear conversion tables and formulas. For the official UK legal framework, the government’s page on weights and measures is the definitive reference.
Quick recap: converting kg to stones and pounds
To convert kilograms to stones and pounds manually, first divide the weight in kg by 6.35029318 to get the number of stones. Take the remainder in kilograms, multiply by 2.20462 to get pounds, then round as needed. Alternatively, convert kg to total pounds (kg × 2.20462) and then divide by 14 — the quotient is stones, the remainder is pounds. For common values, memorise a few benchmarks: 60 kg ≈ 9 st 6 lb, 70 kg ≈ 11 st 0 lb. You may also find it useful to read about How Tall Is Tyson Fury, where body measurements in stones and pounds are frequently discussed, or explore Low Blood Pressure Causes, a health topic where weight can be a relevant factor.
Frequently asked questions about kg to stones and pounds
How many kg in a stone?
Exactly 6.35029318 kilograms. Often rounded to 6.35 kg.
How do I convert kg to stones and pounds manually?
Divide kg by 6.35029318 to get stones. The remainder in kg can be multiplied by 2.20462 to get pounds.
Why does the NHS use stones and pounds?
Many patients in the UK still think in stones and pounds; offering both systems aids understanding.
What is 70 kg in stone and pounds?
70 kg ≈ 11 stone 0.3 lb (often rounded to 11 stone 0 lb).
Is there an official NHS conversion chart?
Yes, several NHS trusts provide PDF charts, e.g., NHS Grampian and UHSussex.
What is 100 kg in stone and pounds?
100 kg is approximately 15 stone 10 pounds (15 st 10 lb).
How many pounds are in a stone?
14 pounds.
Are stone and pounds used outside the UK?
Primarily in the UK and Ireland. Other countries use pounds alone or metric.
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Isabelle Knight is TV & Streaming Editor at StoryNative.uk, covering television, streaming platforms, broadcast schedules and platform news.