Stones and Pounds to Kilos: Quick NHS Conversion Guide
If you’ve ever stood on a UK bathroom scale and stared at a number in stones, then tried to log it into a fitness app that only speaks kilograms, you know the hassle. This guide unpacks the exact conversion formulas, NHS-approved charts, and quick-reference examples so you never have to guess again.
1 stone: 14 pounds ·
1 stone: 6.35029318 kilograms ·
1 kilogram: 2.20462 pounds ·
1 pound: 0.45359237 kilograms
Quick snapshot
- 1 stone = 14 pounds (exact) (The Calculator Site)
- 1 stone = 6.35029318 kg (exact definition) (UnitConverters.net)
- NHS provides official weight conversion charts in PDF format (University Hospitals Sussex NHS Foundation Trust)
- Rounding rules for medical vs everyday use may vary — some calculators round to 2 decimal places, others to 1
- The stone unit has been used in the UK and Ireland for centuries, with the NHS continuing to publish stone-and-pound conversion charts as recently as 2023
- Look for deeper integration of metric conversions in UK digital health apps, though stone measurements remain standard for clinical weight tracking
The table below summarizes the key conversion factors for quick reference.
| Label | Value |
|---|---|
| Stone | 14 pounds |
| Stone in kg | 6.35029318 kg |
| Pound in kg | 0.45359237 kg |
| Kilogram in pounds | 2.20462 lb |
| Common NHS range | 44 kg to 120 kg |
How to Convert Stones and Pounds to Kilograms
Using the conversion formula
- Multiply the stone portion by 6.35029318 to get the kilogram equivalent of that part.
- Multiply the pound portion by 0.45359237 to get the kilogram equivalent of that part.
- Add both results together for total kilograms.
The formula is straightforward: kg = (stones × 6.35029318) + (pounds × 0.45359237). For example, 10 stone 5 pounds becomes (10 × 6.35029318) + (5 × 0.45359237) = 63.5029318 + 2.26796185 = 65.77 kg (The Calculator Site (UK conversion resource)).
For reverse conversions, dividing kilograms by 6.35029318 gives you the stone figure, then the decimal remainder multiplied by 14 yields the remaining pounds (University of Manchester (academic conversion reference)).
Precision matters in medical settings. Using 6.35 instead of 6.35029318 introduces a drift of about 0.004% per stone — small for everyday use, but significant for clinical dosages or detailed health tracking.
The implication: mastering this formula ensures accuracy whether you’re tracking weight for personal health or clinical purposes.
Using an online calculator
Several free calculators automate the formula. You enter stones and pounds (or just total pounds) and get kilograms instantly. A worked example from a YouTube demonstration converts 62 kg into 136 pounds, then into 9 stone 10 pounds by dividing by 14 (YouTube tutorial (conversion demonstration)).
These calculators typically round to two decimal places for grams, though some round to one decimal place for simplicity. For body weight, the NHS charts round to the nearest whole stone and pound (NHS Grampian (Scottish health board)).
Using a conversion chart
Charts give you a quick lookup without math. The University of Manchester’s conversion reference includes a table that states 1 pound = 453.6 g and 1 stone = 14 pounds = 6.35 kg (University of Manchester (academic conversion reference)). A chart from the occupational health resource “What is Occupational Health?” lists 68.0 kg as 150 lb and 10 stone 10 lb (Occupational Health UK (weight conversion resource)).
For the most authoritative source, NHS health boards produce hospital-grade charts covering the clinical range, typically from around 44 kg up to 120 kg (University Hospitals Sussex NHS Foundation Trust (NHS trust weight chart)).
What Is the NHS Kg to Stone and Pounds Conversion?
NHS weight conversion chart PDF
The National Health Service provides downloadable PDF charts that convert kilograms into stones and pounds. A Healthy Weight Grampian NHS Scotland PDF is explicitly titled “Change Kg’s into Stones and Pounds” and presents a clean, printable table covering the range 44.5 kg to 120 kg (NHS Grampian (Scottish health board)). An example row from the University Hospitals Sussex NHS Foundation Trust chart shows 6 stone 11 pounds listed as 43.09 kg (University Hospitals Sussex NHS Foundation Trust (NHS trust weight chart)).
Clinical use of stone and pounds in the UK
The NHS and wider UK health services standardize on stones and pounds for patient weight tracking. Because medical dosing and BMI calculations often require exact metric values, clinicians rely on these conversion charts to convert stone readings to kilograms accurately (University Hospitals Sussex NHS Foundation Trust (NHS trust weight chart)). The University of Manchester’s conversion document notes that 1 foot equals 12 inches and 30.48 cm, confirming this document is a general unit-conversion reference rather than an NHS-specific clinical chart — though the same conversion factors apply (University of Manchester (academic conversion reference)).
What this means: if a UK clinician says you weigh “12 stone 8 pounds,” that translates to 80.0 kg on the NHS chart. The NHS standard conversion factor ensures consistency across all NHS trusts.
How Many Pounds Are in a Stone?
Origin of the stone unit
The stone is an English and imperial unit of mass that has been used for centuries, with its origins in trade — a literal stone used as a counterweight (UnitConverters.net (weight conversion resource)). Today it remains the standard for body weight measurement in the UK and Ireland (Stone Synergy (imperial measurement guide)).
By contrast, the kilogram is the base unit of mass in the International System of Units (SI), used almost everywhere else in the world for weight measurements, including most fitness apps and medical devices outside the UK (UnitConverters.net (weight conversion resource)).
Stone and pound relationship
- 1 stone = 14 pounds (exact, by definition of the avoirdupois system).
- 1 stone = 6.35029318 kg (exact by definition).
- 1 pound = 0.45359237 kg (exact by international agreement since 1959).
The conversion factors are fixed. A stone contains exactly 14 avoirdupois pounds, and each pound is precisely 0.45359237 kilograms (UnitConverters.net (weight conversion resource)).
For UK patients tracking weight at home, the stone is not an approximation — it’s a legally defined unit. When your GP records “12 stone 8 pounds,” that is a precise measurement equal to 80.0 kg using the NHS standard.
The pattern: because the stone is fixed at 14 lb, converting from stones to pounds is always a simple multiplication — no decimals until you hit kilograms.
Common Weight Conversions: 60 kg, 80 kg, and 10 Stone
60 kilograms in stones and pounds
60 kg converts to approximately 9 stone 6 pounds (roughly 9.45 stone). This is a common weight target for UK women’s health programs and falls well within the NHS chart range. The exact calculation: 60 ÷ 6.35029318 = 9.448 stones, then the 0.448 × 14 = 6.27 pounds, rounding down to 6 pounds.
80 kilograms in stones and pounds
80 kg equals 12 stone 8 pounds (approximately 12.6 stone). This conversion appears frequently in NHS patient records and weight loss milestones. Calculation: 80 ÷ 6.35029318 = 12.597 stones, with 0.597 × 14 = 8.36 pounds, rounded to 8 pounds.
10 stone in kilograms
10 stone equals exactly 63.5029318 kg — routinely rounded to 63.5 kg for everyday use. 10 stone is a landmark weight for many UK dieters. The formula is simply 10 × 6.35029318 (Inch Calculator (US conversion resource)).
The trade-off: rounding makes these numbers talkable in conversation, but for medical records, always use the full precision or the exact NHS chart value.
How to Convert Stones and Pounds to Kilos and Ounces
Converting stones and pounds to kilograms
This is the same formula as above: multiply stones by 6.35029318, multiply pounds by 0.45359237, and add. The result is in kilograms to whatever decimal place you need. For most body weight purposes, rounding to two decimal places (grams) is sufficient.
Converting stones and pounds to ounces
Because 1 pound = 16 ounces, converting to ounces is straightforward: total pounds × 16. For 10 stone 5 pounds: (10 × 14) + 5 = 145 total pounds. 145 × 16 = 2,320 ounces (Inch Calculator (US conversion resource)). That same weight in kilograms: (10 × 6.35029318) + (5 × 0.45359237) = 63.5029318 + 2.26796185 = 65.77 kg.
Ounce conversions are rare in medical contexts but sometimes appear in cooking or parcel shipping within the UK. The same conversion factors apply — just use total pounds × 16.
“One stone is equal to 14 pounds (avoirdupois)”
“Change Kg’s into Stones and Pounds” — PDF chart covering 44.5 kg to 120 kg
“kilograms = stones × 6.350293”
For anyone managing their weight in the UK, the choice isn’t between imperial and metric — it’s having both ready. The formula works every time, the NHS charts anchor it in clinical practice, and the common conversions cover the ground for daily life. For UK patients and health professionals, the path is clear: learn the formula, bookmark an NHS chart, and never second-guess a stone reading again. For a sustainable weight loss plan, see our guide on How to Lose Weight Fast and Sustainably: Expert Tips.
Related reading: How to Lose Weight Fast and Sustainably: Expert Tips · Home Workout Without Equipment
Frequently asked questions
What is a stone in weight measurement?
A stone is a unit of mass equal to 14 avoirdupois pounds, or 6.35029318 kilograms. It is used primarily in the UK and Ireland for measuring body weight.
How do I convert pounds to kilograms without a calculator?
Divide the number of pounds by 2.2046 for a close approximation. For exact conversions, multiply by 0.45359237. For example, 150 lb ÷ 2.2046 ≈ 68 kg.
Is the stone unit used outside the UK?
Primarily in the UK and Ireland. The US and Canada rarely use stones for body weight — they use pounds alone. Most of the world uses kilograms.
What is 65 kg in stone and pounds?
65 kg is approximately 10 stone 3 pounds. Exact calculation: 65 ÷ 6.35029318 = 10.236 stones, with 0.236 × 14 = 3.3 pounds, rounded to 10 stone 3 lb.
How accurate do I need to be for medical weight tracking?
Medical contexts typically round to the nearest whole pound or 0.1 kg. NHS charts show stone and pound values alongside kilogram equivalents to one decimal place.
Can I use the same conversion for body weight and cooking?
Yes, the same avoirdupois system applies. However, cooking often uses smaller units (ounces, grams) and may require more precise decimal rounding than body weight.
Why does the NHS use stones and pounds instead of kilograms?
The UK population is familiar with stones and pounds for body weight. NHS charts provide both imperial and metric values to meet clinical and patient needs.
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