1 st = 0.00635029 t (stone → metric ton)
1 st = 0.00635029 t
1 stone equals 0.00635029 metric tons. To convert stones to metric tons, multiply the stone value by 0.00635029. For quick reference: 1 st = 0.00635029 t, 5 st = 0.0317515 t, 10 st = 0.0635029 t, 100 st = 0.635029 t.
Metric tons = Stones × 0.00635029Stones to metric tonnes multiplies by 0.00635029318 (6.35029318 kg per stone, ÷ 1000). A 12 st person is 0.0762 t; 157.47 st make one tonne. The conversion shows up when summing body weights against a vehicle or lift capacity plated in tonnes — a minibus rated at 1 t of payload carries about 13 passengers of 12 st each. Convert each stones-and-pounds weight to kilograms first, then sum; mixing decimal stones with stones-and-pounds mid-calculation is where the errors creep in.
This pairing turns up almost exclusively in livestock and equestrian contexts, where a horse's or cow's weight is estimated in stones by eye or tape but feed and transport regulations are written in tonnes — 100 st is 0.635 t, 250 st is 1.588 t, and 50 st is 0.318 t. Because the numbers involved are usually well under a tonne for a single animal, this conversion matters more for aggregating a herd's total transport weight than for any single beast.
Start with your value in stones.
Multiply the stone value by 0.00635029. This is the exact conversion factor from stones to metric tons.
The product is your value in metric tons. For example, 5 st × 0.00635029 = 0.0317515 t.
The exact factor from stones to metric tons is 0.00635029.
Metric tons = Stones × 0.00635029
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Stones (st) | Metric tons (t) |
|---|---|
| 0.1 st | 0.00063503 t |
| 0.25 st | 0.0015876 t |
| 0.5 st | 0.0031751 t |
| 1 st | 0.0063503 t |
| 1.5 st | 0.0095254 t |
| 2 st | 0.012701 t |
| 2.5 st | 0.015876 t |
| 3 st | 0.019051 t |
| 4 st | 0.025401 t |
| 5 st | 0.031751 t |
| 6 st | 0.038102 t |
| 7 st | 0.044452 t |
| 8 st | 0.050802 t |
| 9 st | 0.057153 t |
| 10 st | 0.063503 t |
| 12 st | 0.076204 t |
| 15 st | 0.095254 t |
| 18 st | 0.11431 t |
| 20 st | 0.12701 t |
| 25 st | 0.15876 t |
| 30 st | 0.19051 t |
| 35 st | 0.22226 t |
| 40 st | 0.25401 t |
| 45 st | 0.28576 t |
| 50 st | 0.31751 t |
| 60 st | 0.38102 t |
| 70 st | 0.44452 t |
| 75 st | 0.47627 t |
| 80 st | 0.50802 t |
| 90 st | 0.57153 t |
| 100 st | 0.63503 t |
| 120 st | 0.76204 t |
| 125 st | 0.79379 t |
| 150 st | 0.95254 t |
| 175 st | 1.1113 t |
| 180 st | 1.1431 t |
| 200 st | 1.2701 t |
| 225 st | 1.4288 t |
| 250 st | 1.5876 t |
| 275 st | 1.7463 t |
| 300 st | 1.9051 t |
| 350 st | 2.2226 t |
| 400 st | 2.5401 t |
| 450 st | 2.8576 t |
| 500 st | 3.1751 t |
| 600 st | 3.8102 t |
| 750 st | 4.7627 t |
| 1000 st | 6.3503 t |
| 2000 st | 12.701 t |
| 5000 st | 31.751 t |
An average adult man in the UK weighs 12–14 st. A medium-sized dog weighs about 3 st.
The stone (st) equals exactly 14 pounds (about 6.35 kg). It is still widely used in the United Kingdom and Ireland to state body weight, even though it is no longer legal for trade. The stone was originally a real stone used by merchants as a counterweight on balances; its weight varied by region and trade until standardized in the late 19th century.
The metric ton, or tonne (t), equals exactly 1,000 kilograms. It is the standard unit for industrial shipping, freight, and bulk commodities such as steel, grain, and cement. Despite the name, it is not part of the strict SI system (the SI name is the megagram), but it is universally accepted in commerce and engineering.
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