Stone to Kilograms (st to kg) Converter

Stone to Kilograms Conversion

The stone (st) is a UK and Irish body-weight unit, while kilograms are the international standard. This converter bridges British weight habits with global medical and fitness systems.

Conversion formula: 1 st = 6.35029 kg — multiply stone by 6.35029.

When You Need This

Medical forms — clinics need weight in kg
International travel — kg-based systems abroad
Fitness apps — many default to kilograms
Body weight tracking — converting stone to metric
Healthcare abroad — communicating weight in kg

How to Convert

The Conversion Formula

One stone equals 6.35029318 kilograms (14 pounds). To convert, multiply stone by 6.35029. For a quick estimate, multiply by 6.35. To reverse, divide kilograms by 6.35029.

kilograms = stone × 6.35029 — for example, 11 st × 6.35029 ≈ 69.85 kg.

Using the Tool

Enter the value

Type the amount you want to convert into the input field.

Read the result instantly

The converted value appears immediately in the second field — no button to press.

Swap or pick any unit

Press the swap button to reverse direction, or open a dropdown to choose a different unit.

Copy the result

Tap the copy icon next to either field to copy the value for your records.

Worked Examples

Stone	Calculation	Kilograms
8 st	`8 × 6.35029`	50.80 kg
10 st	`10 × 6.35029`	63.50 kg
11 st	`11 × 6.35029`	69.85 kg
13 st	`13 × 6.35029`	82.55 kg

Features & Use Cases

Tool Capabilities

Instant Two-Way Conversion

Results update as you type. Use the swap button to reverse the direction in one click.

Any Unit, Any Pair

Searchable dropdowns let you switch to grams, ounces, pounds, stone, tons, carats and more — not just the default pair.

Copy & Quick Reference

Copy either value with one tap, and check the built-in reference table for common conversions at a glance.

Common Use Cases

Medical Forms

Hospitals abroad require weight in kg. Convert your stone figure for accurate, weight-based medical dosing.

Fitness Apps

Most global fitness apps work in kilograms. Convert your stone weight to log and track progress everywhere.

International Travel

Outside the UK, weight is discussed in kilograms. Convert from stone to communicate clearly with locals and clinics.

Weight Tracking

Switching from a UK scale to a metric one? Convert stone to kg so your weight history stays consistent.

Runs in your browser: All calculations happen locally on your device. Nothing is uploaded — fast and private.

Frequently Asked Questions

How many kilograms are in a stone?

One stone equals 6.35029 kg (14 pounds).

How do I convert 11 stone to kilograms?

Multiply by 6.35029: 11 × 6.35029 ≈ 69.85 kg.

How do I convert stone and pounds together?

Convert the stone and the pounds separately, then add. For 11 st 7 lb: 11 × 6.35029 + 7 × 0.4536 ≈ 73.0 kg.

Why do medical forms require kilograms?

Drug dosing is calculated per kilogram of body weight, so kg gives safe, consistent dosing worldwide.

How much is 10 stone in kilograms?

10 × 6.35029 ≈ 63.5 kg.

Is one stone always 14 pounds?

Yes. The modern stone is defined as exactly 14 avoirdupois pounds (6.35029 kg).

Stone to Kilograms