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Kilograms to stone: exact formula, step-by-step examples, conversion chart, and UK body-weight tips
Conversion formula
Verification: factors follow standard unit definitions; round for display only.
Quick reference chart
| Kilogram | Stone |
|---|---|
| 1 | 0.157473 |
| 2 | 0.314946 |
| 3 | 0.472419 |
| 4 | 0.629892 |
| 5 | 0.787365 |
| 6 | 0.944838 |
Educational explanation
Kilograms to stone
Convert kg to st when a EU scale, lab printout, or sports record lists kilograms but you need stone for UK bathroom scales, NHS forms, or stone-and-pound conversation.
Stone is a British avoirdupois unit used mainly for body weight. One stone equals exactly 14 pounds, and the international pound is 0.45359237 kg, giving:
stone = kg ÷ 6.35029318 · equivalently stone = kg × 0.157473
The catalog factor 6.35029318 is exact (14 × 0.45359237). For mixed UK display, convert kg to lb first, then divide by 14 for whole stones and keep remainder pounds.
Step-by-step conversion (worked example 1)
Convert 70 kg to stone and pounds:
- Pounds: 70 ÷ 0.45359237 = 154.324 lb
- Stone: 154.324 ÷ 14 = 11 st 0.3 lb
- Decimal stone: 70 ÷ 6.35029318 = 11.02 st
Step-by-step conversion (worked example 2)
Convert 63.5 kg—approximately 10 stone:
- 63.5 ÷ 6.35029318 = 10 st exactly (within display rounding)
Step-by-step conversion (worked example 3 — shipping)
Convert 23.5 kg luggage to stone (for UK conversation, not billing):
- 23.5 ÷ 6.35029318 = 3.70 st (about 3 st 9.8 lb)
Quick mental estimate (no calculator)
Divide kilograms by 6.35 for decimal stone. Example: 80 kg → about 12.6 st (exact: 12.60 st). For mixed display, kg → lb (× 2.205), then ÷ 14.
Kilogram to stone conversion chart
| Kilograms (kg) | Stone & lb | Decimal stone | Typical context |
|---|---|---|---|
| 6.35 kg | 1 st 0 lb | 1 st | Definition anchor (rounded) |
| 50.8 kg | 8 st 0 lb | 8 st | Light adult bracket |
| 63.5 kg | 10 st 0 lb | 10 st | UK fitness milestone |
| 69.85 kg | 11 st 0 lb | 11 st | Mid-range UK adult |
| 70 kg | 11 st 0.3 lb | 11.02 st | Common gym reference |
| 76.2 kg | 12 st 0 lb | 12 st | Upper-mid UK adult |
| 90 kg | 14 st 2.0 lb | 14.1 st | Strength-sport bracket |
| 100 kg | 15 st 10.5 lb | 15.7 st | Powerlifting reference |
Where kg → st comes up
- UK health & fitness: EU medical records in kg; home scales in stone. Convert before comparing to a GP target quoted in st.
- International sports: Weight classes in kg; UK broadcast graphics in stone—convert for commentary cards.
- Relocation: Visa medicals ask for kg; UK family asks “what's that in stone?”
- Equipment limits: Elevator plaques in kg; UK user manuals sometimes show stone equivalents—verify with 6.35029318, not 6.35 alone.
Stone to kilograms
Convert st to kg when a UK bathroom scale, NHS letter, or fitness app lists stone but you need SI kilograms for EU medical records, clinical dosing inputs, or shipping manifests.
Multiply stone by the catalog factor, or expand through pounds: kg = (st × 14 + remainder lb) × 0.45359237.
kg = stone × 6.35029318 · mixed: kg = ((st × 14) + lb) × 0.45359237
Step-by-step conversion (worked example)
Convert 11 stone to kilograms:
- 11 × 6.35029318 = 69.853225 kg
- Cross-check: 154 lb × 0.45359237 = 69.853225 kg ✓
Quick reference (st → kg)
| Stone (st) | Kilograms (kg) | Typical context |
|---|---|---|
| 1 st | 6.350 kg | Definition anchor |
| 10 st | 63.503 kg | UK fitness milestone |
| 11 st | 69.853 kg | Mid-range UK adult |
| 12 st | 76.204 kg | Upper-mid UK adult |
Units compared, common mistakes, and related tools
Kilogram-to-stone uses an exact lb anchor. Do not confuse stone with kg numerically, and always add remainder pounds on mixed UK scale readings.
Kilograms vs stone at a glance
| Topic | Kilogram (kg) | Stone (st) |
|---|---|---|
| Exact relationship | 1 kg = 0.157473 st | 1 st = 6.35029318 kg |
| Primary use | Science, EU commerce, clinical weight | UK scales, casual conversation |
Common mistakes to avoid
- Treating 10 st as 10 kg—10 st is 63.5 kg, not 10 kg.
- Ignoring remainder pounds—12 st 7 lb is 79.38 kg, not 76.20 kg.
- Using 6.35 kg/st as exact—the catalog value is 6.35029318.
Related weight converters
See stone to kilograms, kilograms to pounds, grams to stone, and stone to pounds.
Frequently asked questions
What is the formula to convert kilograms to stone?
stone = kg ÷ 6.35029318. For mixed UK display: lb = kg ÷ 0.45359237; stone = floor(lb ÷ 14); remainder lb = lb mod 14.
What is the formula to convert stone to kilograms?
kg = stone × 6.35029318. Example: 11 st = 69.853 kg.
What is 70 kg in stone?
70 kg ÷ 6.35029318 ≈ 11.02 st (about 11 st 0.3 lb).
What is 100 kg in stone?
100 kg ≈ 15.7 st (15 st 10.5 lb)—a powerlifting reference.
How many kilograms are in 1 stone?
1 st = 6.35029318 kg exactly (14 × 0.45359237).
How do I convert kg to st without a calculator?
Divide kg by 6.35 for decimal stone, or convert to lb (× 2.2) then divide by 14.
Is stone used in the United States?
No for body weight—US records use pounds only.
Is the kilogram to stone conversion exact?
Yes, given the exact lb-to-kg definition and 14 lb per stone.
Why is 6.35 kg per stone sometimes quoted?
6.35 is a rounded display of the exact 6.35029318 kg/st catalog factor.
Can I use this for medication dosing?
Only to convert a weight value between units—not to calculate doses. Follow your prescriber's instructions.
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