kg to lbs to stone: Quick Conversion Guide & NHS Charts

Q: What is 85 kg in stones and pounds?

85 kg ≈ 13 stone 5.4 lbs (or 187.4 lbs).

Q: Why is the stone used for body weight in the UK?

Historical tradition and NHS record-keeping practices.

If you’ve ever stared at a weight measurement and wished it made sense in pounds, stones, and kilograms all at once, you’re not alone. Converting between these units trips up plenty of people — even in the UK, where stones are standard for body weight but kilograms appear on doctors’ scales and gym plates; this guide breaks down the formulas, gives concrete examples like 70 kg and 62 kg, and points to NHS-approved conversion charts so you can get it right every time.

1 stone = 14 pounds (lbs) ·
1 stone = 6.35029318 kilograms (kg) ·
1 kilogram = 2.20462 pounds (lbs)

According to The Calculator Site, “One stone is equal to 6.35029318 kilograms.”

The University Hospitals Sussex NHS chart confirms that “1 st 0 lb = 6.35 kg.”

Quick snapshot

1Confirmed facts

1 stone = 6.35029318 kg (University Hospitals Sussex NHS chart (UK health service))
1 stone = 14 pounds (Healthy Weight Grampian NHS PDF (Scottish health board))
1 kg = 2.20462 pounds (The Calculator Site (conversion resource))

2What’s unclear

Some online calculators round to different decimal places; always verify with a trusted source like an NHS weight conversion chart (UK health service).
The conversion factor 1 kg = 2.20462 lbs is a rounded figure; some sources use 2.2046226. (NHS weight conversion chart (UK health service))

3Timeline signal

The Healthy Weight Grampian NHS PDF (Scottish health board) was created in November 2017, showing ongoing NHS use of stone–kg conversion charts.
NHS digital weight recording tools continue to include stone units as of 2023. (Healthy Weight Grampian NHS PDF (Scottish health board))

4What’s next

Use an NHS combined height-weight chart (Community Pharmacy Scotland) for clinical accuracy.
Interactive calculators can automate the math, but understanding the formulas helps catch errors. (NHS combined height-weight chart (Community Pharmacy Scotland))

Below is a quick-reference table of the core conversion factors used in UK weight measurement.

Key conversion factors at a glance — six values, one pattern: each pair links the same weight in different units.
From	To	Exact conversion	Source
1 kilogram	pounds	2.20462	The Calculator Site
1 kilogram	stones	0.157473	Healthy Weight Grampian NHS PDF
1 stone	kilograms	6.35029318	The Calculator Site & University Hospitals Sussex NHS
1 stone	pounds	14	Occupational Health UK
1 pound	kilograms	0.453592	Community Pharmacy Scotland NHS PDF
1 pound	stones	0.0714286	Leicester Hospitals Library (NHS)

Bottom line: What this means: the stone and pound are locked together by an exact integer (14), while the kilogram connects via decimal constants. Memorise two numbers — 6.35029318 and 2.20462 — and you can convert any weight.

What is 70 kg in stones and lbs?

Convert 70 kg to stones

Divide 70 by 6.35029318: 70 ÷ 6.35029318 = 11.0231131 stones.
Whole stones = 11; decimal = 0.0231131.
Multiply decimal by 14 to get pounds: 0.0231131 × 14 = 0.3236 lbs (rounded).
So 70 kg ≈ 11 stone 0.3 lbs (Leicester Hospitals Library (NHS conversion tool)).

70 kg in pounds

70 kg × 2.20462 = 154.3234 lbs.
Rounded to one decimal: 154.3 lbs.

The pattern: 70 kg is very close to 11 stone — but not exactly, which surprises many people who round to the nearest whole stone.

What is 1 stone equal to in kg?

Definition of a stone

The stone is a British imperial unit of mass, legally defined as exactly 14 pounds since the Weights and Measures Act 1835. One stone equals 6.35029318 kilograms, a conversion recognised by all UK health authorities (Community Pharmacy Scotland NHS PDF; Healthy Weight Grampian NHS PDF).

Conversion formula

Stones to kg: multiply stones by 6.35029318.
Stones to lbs: multiply stones by 14.
Lbs to kg: multiply lbs by 0.45359237.

Why this matters: if you’re comparing a weight from a UK doctor’s record (in stones) with an international study (in kg), the exact factor avoids rounding errors that could affect medication dosing or BMI classification.

What is 62 kg in stones and pounds?

Convert 62 kg to stones

62 ÷ 6.35029318 = 9.76309 stones.
Whole stones = 9; decimal = 0.76309.
0.76309 × 14 = 10.6833 lbs.
Result: 62 kg ≈ 9 stone 10.7 lbs (Leicester Hospitals Library (NHS conversion tool) gives 9 st 11 lb = 62.14 kg, close).

62 kg in pounds

62 × 2.20462 = 136.6864 lbs.
Rounded: 136.7 lbs.

The catch: 62 kg is a common healthy weight target for women of average height; knowing it’s just under 10 stone helps contextualise UK health guidelines.

Is 11 stone 70 kg?

Check conversion: 11 stone to kg

11 × 6.35029318 = 69.853225 kg.
11 stone is approximately 69.85 kg, not exactly 70 kg.

Common misconception

Many people assume 11 stone equals exactly 70 kg because the numbers are close. The difference is 0.15 kg — about 150 grams. While small for casual conversation, it matters in clinical settings. The Occupational Health UK chart lists 69.9 kg for 11 stone, consistent with 69.85 kg when rounding.

The trade-off: using a rounded value (11 st ≈ 70 kg) is fine for everyday talk, but for BMI calculations or prescription weight-based dosing, always use the exact conversion.

What weight should a 5ft 3 woman be in stones and pounds?

Healthy weight range for 5ft 3

According to NHS guidelines, a healthy BMI for adults is 18.5–24.9 kg/m². For a woman 5 ft 3 in (1.60 m), that translates to a weight range of roughly 47.6–64.4 kg (Leicester Hospitals Library (NHS conversion tool)).

Conversion to stones and pounds

Lower bound: 47.6 kg → 7 stone 7.0 lbs (since 47.6 ÷ 6.35029318 = 7.496 st → 7 st + 0.496×14 = 6.9 lbs ≈ 7 st 7 lb).
Upper bound: 64.4 kg → 10 stone 2.0 lbs (64.4 ÷ 6.35029318 = 10.141 st → 10 st + 0.141×14 = 2.0 lbs).

What this means: a 5ft 3 woman’s healthy weight is between 7 stone 7 pounds and 10 stone 2 pounds. This aligns with the Healthy Weight Grampian NHS PDF, which lists 9 st 11 lb = 62.14 kg (within range).

How to Convert Kilograms to Stones and Pounds (Step-by-Step)

Get your weight in kilograms. Example: 75 kg.
Divide by 6.35029318 to get total stones. 75 ÷ 6.35029318 = 11.8105 stones.
Take the whole number as stones. 11 stones.
Multiply the decimal by 14 to get pounds. 0.8105 × 14 = 11.347 lbs.
Round pounds to one decimal. 11.3 lbs.
Result: 75 kg ≈ 11 stone 11.3 lbs.

To reverse (stone + pounds → kg): multiply stones by 6.35029318, multiply pounds by 0.45359237, add the two results.

The upshot

UK clinicians rely on NHS conversion charts to avoid decimal errors. For a 75 kg patient, rounding 11 stone 11 lbs instead of exact 11 st 11.3 lbs can shift BMI by 0.1 – harmless in most cases but critical in paediatrics and oncology.

The implication: understanding these conversions is essential for accurate clinical weight recording.

Rounding note

When using online calculators, always cross-check with an NHS-approved chart because different rounding conventions can produce slight variations.

Additional sources

personalpages.manchester.ac.uk, best.barnsleyccg.nhs.uk

Frequently asked questions

How many kilograms are in 10 stone?

10 stone × 6.35029318 = 63.5029 kg. (Community Pharmacy Scotland NHS PDF)

What is 85 kg in stones and pounds?

85 ÷ 6.35029318 = 13.385 stones → 13 stone + 0.385×14 = 5.4 lbs → 13 st 5.4 lbs. 85 kg × 2.20462 = 187.4 lbs.

How do I convert pounds to stones?

Divide pounds by 14. Example: 154 lbs ÷ 14 = 11 stone (Occupational Health UK).

Is stone a unit used outside the UK?

The stone is primarily used in the UK and Ireland for body weight. It is not official in the US, though some people still use it informally.

What is 100 kg in stones and pounds?

100 ÷ 6.35029318 = 15.747 stones → 15 stone + 0.747×14 = 10.5 lbs → 15 st 10.5 lbs (approx. 220.5 lbs).

How many pounds in 5 stones?

5 × 14 = 70 pounds.

What is 75 kg in stones and pounds?

75 kg = 11 stone 11.3 lbs as shown in the step-by-step guide.

Why is the stone used for body weight in the UK?

Historical tradition: the stone was a standard trade weight in medieval England and became customary for human body weight. The NHS continues to record weight in stones and pounds alongside kilograms for patient familiarity.

These FAQs cover the most common weight conversion queries for UK patients.

Summary

The conversion between kg, lbs, and stone isn’t complicated once you know the two key numbers: 6.35029318 (stone–kg) and 2.20462 (kg–lb). NHS-approved charts from Healthy Weight Grampian and Leicester Hospitals Library give you ready-made tables so you never have to calculate manually. For anyone in the UK tracking their weight or managing a patient’s record, the smartest move is to bookmark one of these official charts — or use a tier-1 source like Community Pharmacy Scotland — and double-check any online calculator against these trusted references. For UK clinicians and patients, the choice is clear: rely on NHS-verified conversions, or risk the 0.15 kg rounding error that can nudge a BMI category.