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Equivalent weight
Accurate weight conversion tool for stones to metric tonnes and tonnes to stones
Convert stones to tonnes instantly with precise calculations. Includes bidirectional conversion and full weight breakdowns including kilograms, pounds, and ounces for 2026.
Professional weight conversion for health, logistics, agriculture, and scientific applications
Convert stones to metric tonnes using the exact factor of 0.00635029318 tonnes per stone. One stone equals exactly 6.35029318 kilograms by definition, and dividing by 1,000 gives the tonne value — a fully traceable conversion with no rounding error, ideal for precise reporting in health, shipping, and scientific contexts in 2026.
Switch instantly between stones to tonnes and tonnes to stones conversion modes. Results also include kilograms, pounds, ounces, and grams — giving you a complete multi-unit weight picture from a single input value without needing multiple tools or manual calculations.
Useful for healthcare professionals, livestock farmers, freight and logistics workers, weight-loss trackers, athletes, and students. Whether you are converting body weight, cargo, animal weight, or research data between the Imperial stone system and the metric tonne scale, this free tool delivers fast, reliable results.
Select conversion direction and enter your value below
The stone is a traditional Imperial unit of mass used primarily in the United Kingdom and Ireland for measuring body weight and livestock. 1 stone equals exactly 14 pounds avoirdupois, or 6.35029318 kilograms — a defined exact value under the international yard and pound agreement of 1959. A metric tonne equals exactly 1,000 kilograms. Therefore, 1 stone = 6.35029318 ÷ 1,000 = 0.00635029318 tonnes, and conversely 1 tonne = 1,000 ÷ 6.35029318 = 157.473 stones.
While the stone remains in everyday use in the UK and Ireland for body weight, the metric tonne is the globally standard unit for commercial, industrial, and scientific mass measurement, as defined under the International System of Units (SI) maintained by the BIPM. Converting between these two units is common in healthcare data management, livestock marketing, and international weight reporting in 2026.
All values shown are equal to exactly 1 stone expressed in different weight units.
Use this quick-reference table for common stones to tonnes conversions. All values use the exact factor of 1 stone = 0.00635029318 tonnes.
| Stones (st) | Tonnes (t) | Kilograms (kg) | Pounds (lb) |
|---|---|---|---|
| 1 st | 0.006350 t | 6.350 kg | 14 lb |
| 2 st | 0.012701 t | 12.701 kg | 28 lb |
| 5 st | 0.031751 t | 31.751 kg | 70 lb |
| 8 st | 0.050802 t | 50.802 kg | 112 lb |
| 10 st | 0.063503 t | 63.503 kg | 140 lb |
| 12 st | 0.076204 t | 76.204 kg | 168 lb |
| 14 st | 0.088904 t | 88.904 kg | 196 lb |
| 15 st | 0.095254 t | 95.254 kg | 210 lb |
| 20 st | 0.127006 t | 127.006 kg | 280 lb |
| 50 st | 0.317515 t | 317.515 kg | 700 lb |
| 100 st | 0.635029 t | 635.029 kg | 1,400 lb |
| 157.473 st | 1.000000 t | 1,000.000 kg | 2,204.623 lb |
Need to convert in reverse? Use this reference table for quick tonnes to stones conversions at a glance.
| Tonnes (t) | Stones (st) | Kilograms (kg) | Pounds (lb) |
|---|---|---|---|
| 0.01 t | 1.5747 st | 10 kg | 22.046 lb |
| 0.05 t | 7.8737 st | 50 kg | 110.231 lb |
| 0.1 t | 15.747 st | 100 kg | 220.462 lb |
| 0.2 t | 31.495 st | 200 kg | 440.925 lb |
| 0.5 t | 78.737 st | 500 kg | 1,102.311 lb |
| 1.0 t | 157.473 st | 1,000 kg | 2,204.623 lb |
| 2.0 t | 314.946 st | 2,000 kg | 4,409.245 lb |
| 5.0 t | 787.365 st | 5,000 kg | 11,023.113 lb |
| 10.0 t | 1,574.730 st | 10,000 kg | 22,046.226 lb |
To convert stones to metric tonnes, multiply the number of stones by 0.00635029318. This is equivalent to multiplying by 6.35029318 to get kilograms, then dividing by 1,000. For a quick mental estimate, multiplying by 0.00635 is accurate to within 0.005% for everyday purposes. To convert in reverse, multiply tonnes by 157.473 to get stones.
Convert 11 stone to tonnes:
11 × 0.00635029318 = 0.069853 t
Convert 14 stone to tonnes:
14 × 0.00635029318 = 0.088904 t
Convert 1 tonne to stones:
1 × 157.47304 = 157.473 st
The stone is still widely used in the United Kingdom and Ireland for measuring human body weight and animal weight, while the metric tonne dominates commercial, scientific, and international reporting. This means converting between them is a regular requirement in several practical fields. In healthcare and public health, patient weight data collected in stones must often be converted to metric tonnes for clinical databases, BMI population studies, and international health records. Organisations such as the World Health Organization (WHO) standardise body mass data in kilograms, requiring accurate conversion from stones in 2026.
Hospitals, GP surgeries, and public health agencies in the UK and Ireland routinely record patient weights in stones and pounds. Converting these to metric tonnes is required for national and international epidemiological databases, clinical trials reporting, and electronic health records that use SI units as standard.
Farmers and livestock traders in Britain and Ireland traditionally measure animal weights in stones. Converting to metric tonnes is essential for export documentation, meat yield calculations, auction records, and compliance with EU and international trade standards that require weight declarations in metric units.
Boxers, wrestlers, powerlifters, and rowers are commonly weighed in stones in the UK, but international competition weight categories are set in kilograms. Converting stone body weight to the tonne scale is also used in sports science research when reporting population-level athlete data in scientific publications.
Cargo weights in older UK records may be expressed in stones for certain goods. Converting accumulated stone weights to metric tonnes is needed for vehicle payload compliance, freight billing by metric weight, and customs declaration forms that require gross weight in tonnes for international shipments in 2026.
The most frequent error is confusing the metric tonne (1,000 kg) with the short ton (2,000 lb ≈ 907 kg) or the long ton (2,240 lb ≈ 1,016 kg). Each uses a different conversion factor from stones. This page converts to metric tonnes exclusively. A second common mistake is treating the stone as a round 6 kg instead of its precise value of 6.35029318 kg, which causes a 5.5% under-reporting error in precise applications.
The International Bureau of Weights and Measures maintains the official definitions of all SI units including the kilogram and the metric tonne (1,000 kg). The stone is derived from the legally defined pound of exactly 0.45359237 kilograms under the international agreement of 1959.
Visit BIPM →The World Health Organization uses kilograms and metric tonnes for all international body mass data, mortality statistics, and health indicator databases. Converting stone-based health data to metric tonnes is standard practice for submission to WHO global health systems in 2026.
Visit WHO →Explore all free weight and area conversion tools on ConcreteMetric — including square metres to hectares, square inches to cm², acres to square metres, and more — all completely free, accurate, and mobile friendly for 2026.
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