Enter any weight — in milligrams, grams, kilograms, tonnes, ounces, pounds or stones — and see it converted into every other unit at once.
What Is a Weight Converter?
A weight converter changes a mass measurement from one unit to another — metric units (milligrams, grams, kilograms, tonnes) and imperial units (ounces, pounds, stones). Every conversion runs through kilograms using exact defined factors: 1 pound is exactly 0.45359237 kg, 1 ounce is exactly 28.349523125 g, and 1 stone is exactly 14 pounds. This converter shows your value in all seven units at once, which is handy for recipes, luggage limits, shipping, gym weights and body-weight comparisons.
How to Use
- Enter the value you want to convert.
- Choose the unit it is in.
- Click “Convert Weight”.
- Read the same weight in all seven units.
Formula
Convert to kilograms first (value × the unit’s factor in kg), then divide by the target unit’s factor. Factors in kg: mg 0.000001, g 0.001, kg 1, tonne 1000, ounce 0.028349523125, pound 0.45359237, stone 6.35029318.
Worked Example
70 kg = 70 × 1,000 = 70,000 g = 70,000,000 mg = 0.07 tonnes. In imperial: 70 ÷ 0.45359237 = 154.3236 lb; 70 ÷ 0.028349523125 = 2,469.1773 oz; 70 ÷ 6.35029318 = 11.0231 stones.
How It Works, In Plain Words
Every conversion on this page runs through one hub unit: the kilogram. Each of the seven units has an exact factor — how many kilograms one unit of it is worth. A gram is 0.001 kg, a pound is 0.45359237 kg, an ounce is 0.028349523125 kg and a stone is 6.35029318 kg, with milligrams at 0.000001 and tonnes at 1,000. The tool first multiplies your value by its unit’s factor to get kilograms, then divides that kilogram figure by each other unit’s factor in turn. That is why one click fills all seven rows at once: 70 kg stays 70 kg, becomes 70 × 1,000 = 70,000 g and 70,000,000 mg on the metric side, and 70 ÷ 0.45359237 = 154.3236 lb, 2,469.1773 oz and 11.0231 st on the imperial side. Routing everything through kilograms also keeps the factors consistent — there is no separate, possibly different, factor for every pair of units. Results are shown to at most four decimal places, with thousands separators, so very large and very small answers stay readable.
Real-World Uses
Checking a luggage limit. Airlines state baggage allowances in one unit while a home scale may show another: convert your case’s weight here and compare like with like before you travel, in kilograms, pounds or stones. Following a recipe from another country. Ingredient quantities in grams meet a kitchen scale marked in ounces — one conversion from this page’s all-units result covers whichever unit the scale uses. Comparing body weight for the site’s health tools. The Benefits list calls this converter the companion to the BMI and body-weight calculators: a weight taken in stones or pounds becomes the kilograms those tools expect, with 14 pounds to the stone handled exactly. Pricing a parcel. Couriers quote by weight bands, and a parcel weighed at home in grams can be checked against a limit stated in kilograms or pounds before you book — the same one-click result shows every unit, so the band comparison is instant.
Benefits
- All seven common weight units in one result
- Exact international conversion factors
- Metric and imperial together for travel, shipping and shopping
- Ideal companion to our BMI and body-weight health calculators
Features of Our Tool
- Instant results in your browser
- No sign-up, no download, 100% free
- Works on mobile, tablet and desktop
- Clear step-by-step explanation below the tool
- Private — your entries never leave your device.
Common Mistakes
- Confusing ounces with fluid ounces (fluid ounces measure volume, not weight)
- Thinking a stone is 10 pounds — it is 14 pounds
- Mixing up US tons (2,000 lb) with metric tonnes (1,000 kg) — this converter uses metric tonnes
Common Mistakes to Avoid
The mistakes list above covers the fluid-ounce trap, the 10-pound stone and the ton-versus-tonne mix-up, and three more habits are worth avoiding. The first is picking the wrong From unit: the number 70 means very different weights in kilograms and in pounds, and the tool converts exactly what you tell it — 70 lb would come back as about 31.75 kg, not 70 kg. The second is reading too much into the decimals: results are rounded to four decimal places, which is plenty for luggage, recipes and body weight, but a figure like 11.0231 st is still “about 11 stone” in everyday terms. The third is converting a volume by mistake: this tool is for mass only, so a fluid-ounce or litre figure does not belong here.
FAQ
How many pounds are in 70 kg?
154.3236 lb.
How many kilograms are in a pound?
1 lb = 0.45359237 kg exactly.
How many pounds are in a stone?
14 pounds make 1 stone, so 70 kg (11.0231 st) is about 11 stone.
How many ounces are in a kilogram?
About 35.274 oz (1 kg ÷ 0.028349523125 kg per ounce).
What is the difference between a tonne and a ton?
A metric tonne is 1,000 kg. A US (short) ton is 2,000 lb, about 907.18 kg. This converter uses metric tonnes.
Why does the tool show all seven units instead of one answer?
Because most people converting weight need the figure in whichever unit their scale, recipe or limit uses. One click gives milligrams, grams, kilograms, tonnes, ounces, pounds and stones together, so there is no need to run the conversion again for a second unit.
How many decimal places does the result use?
Up to four. Each result is rounded to four decimal places and trailing zeros are dropped, so 70 kg shows as 70 rather than 70.0000, while 154.3236 lb keeps the precision the conversion needs.