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Stone to Kilograms Converter

Convert stone (st) to kilograms (kg) with the exact formula, worked examples and a full conversion chart.

Updated By TrueCalcu Editorial Team Sources
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How to convert stone to kilograms

To convert stone to kilograms, multiply the number of stone by 6.35.

Example: 12 st = 76.204 kg.

Stone is still used for body weight in the U.K. and Ireland; one stone is 14 pounds.

Stone to Kilograms conversion chart

stkg
0.25 st1.588 kg
0.5 st3.175 kg
0.75 st4.763 kg
1 st6.35 kg
1.5 st9.525 kg
2 st12.701 kg
2.5 st15.876 kg
3 st19.051 kg
3.5 st22.226 kg
4 st25.401 kg
4.5 st28.576 kg
5 st31.751 kg
6 st38.102 kg
7 st44.452 kg
8 st50.802 kg
9 st57.153 kg
10 st63.503 kg
11 st69.853 kg
12 st76.204 kg
13 st82.554 kg
14 st88.904 kg
15 st95.254 kg
16 st101.6 kg
18 st114.31 kg
20 st127.01 kg
24 st152.41 kg
25 st158.76 kg
30 st190.51 kg
32 st203.21 kg
35 st222.26 kg
40 st254.01 kg
45 st285.76 kg
50 st317.51 kg
55 st349.27 kg
60 st381.02 kg
64 st406.42 kg
65 st412.77 kg
70 st444.52 kg
75 st476.27 kg
80 st508.02 kg
85 st539.77 kg
90 st571.53 kg
100 st635.03 kg
110 st698.53 kg
120 st762.04 kg
125 st793.79 kg
128 st812.84 kg
150 st952.54 kg
175 st1,111.3 kg
180 st1,143.1 kg
200 st1,270.1 kg
220 st1,397.1 kg
250 st1,587.6 kg
300 st1,905.1 kg
400 st2,540.1 kg
500 st3,175.1 kg
750 st4,762.7 kg
1,000 st6,350.3 kg

Metric vs. U.S. customary units

The United States uses U.S. customary units — inches, feet, miles, pounds, gallons and degrees Fahrenheit — for most everyday purposes. Canada officially adopted the metric system in the 1970s, so road signs, weather forecasts, gas pumps and food labels use kilometers, degrees Celsius, liters and grams. In practice many Canadians still use feet and inches for height, pounds for body weight and square feet for homes, which is why conversions come up constantly on both sides of the border.

Exact conversion factors

Since 1959 the inch, foot, yard, mile and pound have been defined in metric terms, so these conversions are exact, not approximations:

  • 1 inch = 2.54 cm exactly, so 1 foot = 30.48 cm and 1 mile = 1.609344 km.
  • 1 pound = 0.45359237 kg exactly; 1 ounce = 28.349523125 g.
  • 1 U.S. gallon = 3.785411784 liters. The imperial gallon used in the U.K. is larger: 4.54609 liters.
  • 1 acre = 4,046.8564224 m², and 1 hectare = 10,000 m² (about 2.471 acres).

Temperature is different because the scales have different zero points: °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at sea level, and −40 is the same in both scales.

Quick mental shortcuts

  • Kilometers to miles: multiply by 0.6 (100 km ≈ 60 miles; the exact figure is 62.1).
  • Kilograms to pounds: double it and add 10% (70 kg → 140 + 14 = 154 lb).
  • Celsius to Fahrenheit: double it and add 30 for a rough estimate (20 °C → 70 °F; the exact answer is 68 °F).
  • Liters to U.S. gallons: divide by 4 for a quick estimate (40 L ≈ 10 gallons; exactly 10.57).

Cooking and recipe conversions

U.S. recipes measure by volume — cups, tablespoons and teaspoons — while Canadian and most international recipes use milliliters and grams. A U.S. cup is about 237 mL, but Canadian "metric" measuring cups hold 250 mL, so the difference adds up in baking. For flour, sugar and butter, weighing in grams is more accurate than cups because the density of each ingredient differs.

Popular conversions

Pick a conversion below for a dedicated page with the formula, worked examples and a complete conversion chart.

Tips for accurate conversions

Keep full precision until the final step and round only the answer — rounding intermediate numbers can add noticeable errors, especially in recipes, construction and engineering. Always check which gallon, ounce or ton a source means: U.S. and imperial units share names but not sizes, and a "fluid ounce" measures volume while an "ounce" of weight measures mass. For temperatures, remember that a temperature difference converts differently from a temperature reading: a change of 10 °C equals a change of 18 °F, without adding 32.

Popular unit conversions

Frequently asked questions

How many centimeters are in an inch?
Exactly 2.54 centimeters. To convert inches to centimeters, multiply by 2.54; to convert centimeters to inches, divide by 2.54.
How do I convert kg to pounds?
Multiply kilograms by 2.20462. For example, 70 kg × 2.20462 = 154.3 lb.
What is the formula for Celsius to Fahrenheit?
Multiply by 9/5 (1.8) and add 32. For example, 25 °C × 1.8 + 32 = 77 °F.
Is a U.S. gallon the same as a Canadian gallon?
No. Canada sells gas by the liter, but when gallons are mentioned in Canada they are sometimes imperial gallons (4.546 L), which are about 20% larger than U.S. gallons (3.785 L).
How many square feet are in a square meter?
About 10.764 square feet. A 1,000 sq ft home is roughly 92.9 m².

Sources & methodology

This calculator was last reviewed on November 2, 2026. Figures are based on the following official and primary sources:

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