ConvBolt — Unit ConverterStone to Tonnes Converter
Converting stone to tonnes is a multiplication by a fixed factor: 1 st = 0.006350293 t. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one stone works out to 0.006350293 t, the tonne is the far smaller unit of the two: a figure given in tonne always carries a smaller number than the same measurement in stone. A chart drawn in st can hide that, so check which label the axis uses before you compare two readings.
Cooking and shipping are the two places this pair appears most: a kitchen scale reads in stone while a recipe or label is written in tonnes, and a courier tariff built on tonnes still has to be checked against a scale showing stone.
The conversion factor used here is 0.006350293 t per stone (9 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 st a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 157.473 st per t, the exact reciprocal, so a round trip through both pages returns your original number.
Stone to Tonnes formula
Use this formula to convert any stone value to tonnes:
Worked example: 100 st × 0.006350293 = 0.6350293 t.
Stone to Tonnes conversion table
| Stone (st) | Tonnes (t) |
|---|---|
| 0.5 st | 0.003175147 t |
| 1 st | 0.006350293 t |
| 2 st | 0.01270059 t |
| 5 st | 0.03175147 t |
| 10 st | 0.06350293 t |
| 20 st | 0.1270059 t |
| 50 st | 0.3175147 t |
| 100 st | 0.6350293 t |
| 500 st | 3.175147 t |
| 1000 st | 6.350293 t |
How to convert stone to tonnes
Multiply the stone value by 0.006350293 to get the equivalent in tonnes. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Tonnes to Stone converter instead of dividing by hand; both pages use the same source factors. For every other st conversion in one place, see the st conversion hub.
Frequently asked questions
How many tonnes are in 1 stone?
1 stone = 0.006350293 t.
What is 100 stone in tonnes?
100 st = 0.6350293 t.
Is converting stone to tonnes the same as tonnes to stone?
No — the direction changes the multiplier. The reverse conversion (1 t = 157.473 st) is on the Tonnes to Stone page.
Related conversions
Try the ConvBolt Unit Converter for any other weight unit, browse the Weight conversions, or read our conversion guides.