Weight Converter Online Free
Convert between milligrams, grams, kilograms, metric tons, ounces, pounds, stone, and US tons instantly. Metric and imperial — no signup, runs entirely in your browser.
All Weight Conversions
| Unit | Value |
|---|---|
| Milligram (mg) | — |
| Gram (g) | — |
| Kilogram (kg) | — |
| Metric Ton (t) | — |
| Ounce (oz) | — |
| Pound (lb) | — |
| Stone (st) | — |
| US Ton (US ton) | — |
How to Convert Weight
- 1Select the source unit from the From dropdown — e.g. kilograms.
- 2Enter your value. The target unit result updates instantly. Use the swap button (↔) to reverse direction.
- 3The all conversions table shows the value in every supported unit simultaneously — useful for checking multiple units at once.
Metric and Imperial Weight Units
The metric system scales by powers of 10: 1000 mg = 1 g, 1000 g = 1 kg, 1000 kg = 1 metric ton. Imperial units use less regular ratios: 16 oz = 1 lb, 14 lb = 1 stone, 2000 lb = 1 US ton. The exact bridge between the systems is 1 lb = 0.45359237 kg, defined by international agreement in 1959.
Common Weight Conversion Reference
| From | To | Multiply by | Example |
|---|---|---|---|
| Kilograms | Pounds | 2.20462 | 70 kg = 154.32 lb |
| Pounds | Kilograms | 0.453592 | 150 lb = 68.04 kg |
| Grams | Ounces | 0.035274 | 100 g = 3.53 oz |
| Ounces | Grams | 28.3495 | 8 oz = 226.8 g |
| Stone | Kilograms | 6.35029 | 11 st = 69.85 kg |
| Kilograms | Stone | 0.157473 | 70 kg = 11.02 st |
| Metric Tons | Pounds | 2204.62 | 1 t = 2204.62 lb |
Quick Mental Weight Conversion Tips
kg to Pounds
Multiply by 2.2 for a quick estimate. So 70 kg ≈ 154 lb. The exact factor is 2.20462, but 2.2 works well for body weight, luggage limits, and shipping weights.
Pounds to kg
Divide by 2.2 for a quick estimate. So 200 lb ÷ 2.2 ≈ 91 kg. For greater accuracy, multiply by 0.4536 instead.
Stone for Body Weight
Common in the UK: 1 stone = 14 lb = 6.35 kg. So 11 stone 7 lb = (11 × 14 + 7) = 161 lb = 73.03 kg. Convert stone to kg by multiplying by 6.35.
Cooking Conversions
1 cup of water ≈ 240 g. 1 oz ≈ 28 g. For recipes from US sources: multiply oz by 28 to get grams, or divide grams by 28 to get oz.
Frequently Asked Questions
How do I convert kilograms to pounds?
Multiply by 2.20462. The exact definition is 1 lb = 0.45359237 kg, so 1 kg = 1 / 0.45359237 ≈ 2.20462 lb. For example, 70 kg × 2.20462 = 154.32 lb. For a quick estimate, multiply by 2.2.
How do I convert pounds to kilograms?
Multiply by 0.453592. One pound is defined as exactly 0.45359237 kilograms. For example, 150 lb × 0.453592 = 68.04 kg. For a rough estimate, divide by 2.2.
How many grams are in an ounce?
One ounce (avoirdupois) equals 28.3495 grams. Conversely, 1 gram = 0.035274 ounces. Note: troy ounces (used for precious metals) are heavier — 1 troy oz = 31.1035 grams. This converter uses the standard avoirdupois ounce.
What is a stone and how do I convert it to kilograms?
A stone is a unit of weight used mainly in the UK and Ireland for body weight. One stone equals 14 pounds = 6.35029 kg. To convert stone to kg, multiply by 6.35029. So 11 stone = 69.85 kg.
What is the difference between weight and mass?
Physically, mass is the amount of matter (kg, g, lb) while weight is the gravitational force on that mass (Newtons). In everyday use, "weight" refers to mass. All units in this converter are technically mass units.
Does the converter work offline?
Yes. All conversion factors are built into the page. After it loads, you can use the converter without an internet connection.