KG to Stones Converter — Convert Kilograms to Stones (Exact: st = kg ÷ 6.35029318)
Accurate kilograms (kg) to stones (st) converter using the exact relation 1 stone = 14 pounds = 6.35029318 kg. Ideal for UK/IE body weight, sports, nutrition, and mixed-unit reporting.
Exact factors: 1 st = 14 lb = 6.35029318 kg ⇒ st = kg ÷ 6.35029318. See all mass converters on our weight conversion calculators.
About Kilograms to Stones Conversion
Kilogram (kg) is the SI base unit for mass and the foundation of scientific, medical, and industrial measurement worldwide. The stone (st) is a culturally preferred unit for personal body weight across the UK and Ireland (and in media and sports that speak to those audiences). Converting kg → st allows you to present the same underlying measurement in the format your readers expect, without losing precision or provenance. For more tools like stones ↔ pounds or kg ↔ lb, visit our weight conversion unit calculators.
KG to Stones Formula
Exact relationship
Use either equivalent form:
st = kg ÷ 6.35029318
// equivalently
st = kg × 0.157473044418Example:
75 kg ÷ 6.35029318 = 11.81100 st → ~11 st 11 lb (see method below)Reverse calculation (st → kg)
Multiply by 6.35029318:
kg = st × 6.35029318Related Weight Converters
What is a Kilogram?
The kilogram is defined via the Planck constant, making it stable and reproducible across time and laboratories. It integrates cleanly with SI for nutrition science, clinical records, and manufacturing tolerances. Even when you present stones publicly, keep a canonical kilogram value internally to avoid unit drift across systems.
What is a Stone?
The modern international stone is fixed at 14 pounds. Because pounds are defined as exactly 0.45359237 kg, one stone is therefore 6.35029318 kg. In consumer contexts (healthcare letters, gym announcements, sports media), stones and pounds are often shown together—e.g., 11 st 11 lb—alongside kg in parentheses for clarity.
Step-by-Step: Stones + Pounds Breakdown
- Compute st_float = kg ÷ 6.35029318.
- The whole number is the stone value (e.g., 11).
- Multiply the fractional remainder by 14 to get leftover pounds.
- Round pounds to your display rule (nearest lb for headlines, 1 d.p. for precision).
Example walkthrough:
kg = 75
st_float = 75 ÷ 6.35029318 = 11.81100
stones = 11
pounds = 0.81100 × 14 = 11.35 → 11 lb
Result: 11 st 11 lb (≈ 75.0 kg)Common Conversions
Everyday quick checks
| kg | st |
|---|---|
| 50 | 7.87365 |
| 60 | 9.44838 |
| 65 | 10.23674 |
| 70 | 11.02311 |
| 75 | 11.81100 |
| 80 | 12.59838 |
| 90 | 14.17311 |
Precision, Rounding & Significant Figures
Operational rounding
Consumer-facing displays often show stones to one decimal (e.g., 11.8 st) or stones + whole pounds. Medical notes keep canonical kg values for dosage and longitudinal analytics. Publish a clear rounding policy and apply it consistently across apps, emails, and PDFs.
Consistent documentation
Name fields clearly (e.g., weight_kg, weight_st, weight_lb). Note the constants in your methodology: “1 st = 14 lb = 6.35029318 kg; 1 lb = 0.45359237 kg.” Convert once at the system edge and avoid multi-stage rounding.
Where This Converter Is Used
- 🏥 Healthcare & clinics: Patient weight recorded in kg, communicated in stones and pounds for readability.
- 🏉 Sports & media: Athlete profiles, weigh-ins, and commentary for UK/IE audiences.
- 🏋️ Fitness apps: User settings per locale with dual-unit history for progress charts.
- 🛍️ E-commerce: Product specs shown in stones & lb for UK shoppers, backed by SI in the catalog.
- 📈 Analytics: BI dashboards that keep kg internally but localize the display for stakeholders.
Quick Reference Table
| st | kg |
|---|---|
| 8 | 50.80235 |
| 9 | 57.15264 |
| 10 | 63.50293 |
| 11 | 69.85322 |
| 12 | 76.20352 |
| 13 | 82.55381 |
Frequently Asked Questions
What is the exact formula to convert kilograms to stones?
Use the exact avoirdupois relationship: 1 stone = 6.35029318 kg. Therefore st = kg ÷ 6.35029318. Equivalently, multiply by 0.157473044418. These constants derive from 1 stone = 14 international pounds and 1 pound = 0.45359237 kg.
How do I express the result as stones and pounds (e.g., 10 st 7 lb)?
First compute stones as st = kg ÷ 6.35029318. The whole-number part is the stone value. To get leftover pounds, multiply the fractional part by 14: lb_remainder = frac(st) × 14. Example: 75 kg → 11.8110 st → 11 st and 0.8110×14 = 11.35 lb ≈ 11 st 11 lb (rounded).
Why does the UK/Ireland still use stones for body weight?
Stones are culturally entrenched for personal weight in the UK and Ireland, media, and some sports. Healthcare and science, however, use SI units (kg). This converter helps present the same measurement in the format your audience understands while keeping exact SI under the hood.
Is a ‘stone’ ever different by region or context?
Historically, stones varied by commodity and region, but in modern practice the international stone is standardized at 14 pounds. This tool converts using that fixed definition and the international avoirdupois pound.
What precision should I show for body weight?
For public displays, show one decimal in stones (e.g., 11.8 st) or show stones and nearest whole pound (11 st 11 lb). In clinical or nutrition contexts, keep more precision in kg internally and round once for display.
How do I convert back from stones to kilograms?
Multiply by 6.35029318: kg = st × 6.35029318. If you have stones and pounds, first convert the pounds to a stone fraction (lb ÷ 14), add to stones, then multiply the sum by 6.35029318.
Is this the same as converting kilograms to pounds first, then to stones?
Yes—kg → lb (× 2.20462262185) and then lb → st (÷ 14) yields the same result. Direct conversion is simpler and avoids extra rounding steps.
Can I use this for sports weigh-ins or weight-class calculations?
Yes. Publish public-facing figures in stones and pounds if that’s the norm for your audience, but keep the exact kg record internally for officiating, analytics, and longitudinal tracking.
Tips for Working with Stones & Kilograms
- If you display stones and pounds, keep the canonical kg alongside it in your database for interoperability.
- When announcing progress publicly, round stones to 1 d.p. or express as st + lb for readability.
- Disclose rounding/precision rules in help docs to align expectations across teams and channels.
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