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Kilograms to Stones Mass Converter
↔ Convert st to kg instead

Common Conversions

kg st
1 0.157
5 0.787
10 1.575
20 3.149
50 7.874
70 11.023
80 12.598
90 14.173
100 15.747
150 23.621

Why this conversion matters in chemistry

UK clinical-trial protocols write inclusion thresholds in kg — a Phase I dose-escalation study might require ≥50 kg. The participant on the phone reports their weight in stones. A 75 kg eligibility floor is 11.81 st, and the conversion is the usual step a research nurse runs during pre-screening to translate the protocol number into the units the participant actually uses. A factor of 0.157473 st per kg comes from the legal definition 1 stone = 6.35029 kg, fixed by the 1985 UK Weights and Measures Act. The stone never appears in published clinical data; it lives only in participant-facing communication.

Formula

st = kg × 0.157473

Worked Examples

6.350 kg = 1 st

One stone — the conversion anchor that defines the relationship.

70 kg = 11.023 st

A 70 kg trial participant in the units they report on the phone.

100 kg = 15.747 st

A round 100 kg figure expressed in stones for a UK participant brief.

Frequently Asked Questions

How do I convert kg to stones?
Multiply by 0.157473, or equivalently divide by 6.35029. So 70 kg becomes 11.02 st. The factor is exact through the 1985 UK definition of the stone as 6.35029 kg.
How do I express the remainder in pounds?
Take the decimal part and multiply by 14. For 70 kg = 11.023 st, the 0.023 remainder × 14 ≈ 0.3 lb, so 70 kg ≈ 11 st 0 lb. UK weight is conventionally written as stones plus a pounds remainder.
Is the stone used in scientific work?
No. The stone never appears in clinical or scientific reporting — those use kg. It survives only in informal UK and Irish body-weight conversation, which is exactly where the conversion matters for participant communication.