Stone to Kilograms Converter

About the Stone to Kilograms Converter

The stone to kilograms converter translates the UK stone-and-pounds format into metric kilograms. One stone equals 6.35029 kilograms, so a full conversion usually means combining the whole-stone value with any extra pounds first. That extra-pound step matters because the UK format is usually written as a mixed body-weight value, not a decimal stone number, and the result needs to reflect the mixed input exactly.

This calculator matches that real-world input format by letting you enter both stone and extra pounds, then showing the kilogram result directly. It also supports reverse conversion through the other weight units, which is useful if you are switching between UK body-weight notation and metric apps or forms. The output is designed to help when the target is a health record, fitness log, or article that wants kilograms rather than stone.

The quick tables are geared toward common body-weight ranges so you can estimate familiar values without rebuilding the conversion from scratch each time. That makes the page useful for both quick checks and more careful comparison work.

When This Page Helps

Kilograms are the standard unit in medical records, fitness apps, and most international contexts. This converter handles the awkward part of the UK format by combining stone and leftover pounds automatically before converting. It keeps the stone-and-pounds input intact long enough to avoid accidental rounding before the metric result is produced.

How to Use the Inputs

1. Enter stone value.
2. Optionally add extra pounds (0–13).
3. Read the kilogram result.
4. Use presets for common stone values.
5. Check the table for batch lookups.
6. Expand the detailed table for pound-level precision.

Example Calculation

Tips & Best Practices

• 1 stone = 6.35 kg — memorize this for quick estimates.
• Add 0.45 kg for each extra pound beyond the whole stone.
• 10 stone = 63.5 kg. 12 stone = 76.2 kg. 15 stone = 95.3 kg.
• For rough conversion: multiply stone by 6.35 and add extra pounds × 0.45.
• UK scales often show both stone and kilograms.
• Medical records in the UK are increasingly using kilograms alongside stone.

Quick Stone-to-Kg Reference

7 st = 44.5 kg, 8 st = 50.8 kg, 9 st = 57.2 kg, 10 st = 63.5 kg, 11 st = 69.9 kg, 12 st = 76.2 kg, 13 st = 82.6 kg, 14 st = 88.9 kg, 15 st = 95.3 kg. These anchor values let you estimate any stone-and-pounds value by adding 0.45 kg per extra pound.

Medical and Fitness Use

Global fitness apps, MyFitnessPal, and medical devices report weight in kilograms. UK users setting goal weights or tracking progress often need to convert their stone-based self-image into kilograms for these tools.

Why Stone Persists

Despite metrication in the UK (1965 onwards), stone remains deeply embedded in everyday language. Newspapers, diet shows, and casual conversation default to stone. The metric system dominates science, medicine, and commerce, but cultural weight expression remains stubbornly imperial.

Frequently Asked Questions

• How many kg is 1 stone?

  1 stone = 6.35029 kilograms. That is the fixed conversion factor used every time the calculator turns stone into metric weight.

• How many kg is 10 stone?

  10 stone = 63.50 kilograms. The result is simply ten times the stone-to-kilogram factor.

• How do I convert 12 stone 7 pounds to kg?

  12 × 14 + 7 = 175 pounds. 175 × 0.453592 = 79.38 kg, so the mixed stone-and-pounds input becomes a single metric value.

• How many stone is 80 kg?

  80 ÷ 6.35029 = 12.60 stone, or 12 stone 8 pounds. The mixed form is usually easier to read when the answer is close to a whole stone.

• Why does the UK use stone but not the US?

  The stone was a traditional British unit. The US adopted pounds directly from the imperial system but dropped stone, while the UK kept stone for body weight by convention and everyday speech.

• Is the NHS switching to kilograms?

  The NHS uses kilograms in medical records, but patients and public health communications still commonly reference stone and pounds alongside kilograms. That is why a converter has to support both forms for practical use.