Weight Converter
Convert between metric and imperial weight and mass units instantly. Enter a value, choose your unit, and see all conversions at once.
How to Use the Weight Converter
Converting weight and mass units is simple with this tool:
- Enter a numeric value in the input field. You can use whole numbers or decimals.
- Select the source unit from the dropdown menu (e.g., kilograms, pounds, ounces).
- View all conversions instantly in the results table below. Results update as you type.
- Click Copy next to any result to copy the value to your clipboard.
About Weight and Mass
Weight and mass are closely related but technically different concepts. Mass is the amount of matter in an object, while weight is the force of gravity acting on that mass. In everyday use, the terms are often interchangeable. The metric system uses grams and kilograms, while the imperial system uses ounces and pounds.
Key conversions include: 1 kilogram = 2.20462 pounds, 1 pound = 16 ounces, 1 stone = 14 pounds, and 1 metric tonne = 1,000 kilograms. The US short ton equals 2,000 pounds, while the imperial long ton equals 2,240 pounds. These conversions are essential for cooking, shipping, fitness tracking, and scientific work.
Common Weight Conversions
The table below lists the most frequently searched weight and mass conversions for quick reference. These cover everyday values used in cooking, fitness, shipping, and health.
| From | To | Result |
|---|---|---|
| 1 ounce | Grams | 28.3495 g |
| 1 pound | Kilograms | 0.4536 kg |
| 1 kilogram | Pounds | 2.20462 lbs |
| 100 grams | Ounces | 3.5274 oz |
| 150 pounds | Kilograms | 68.04 kg |
| 200 pounds | Kilograms | 90.72 kg |
| 1 stone | Kilograms | 6.35 kg |
| 1 metric tonne | Pounds | 2,204.62 lbs |
Weight Conversion Formulas
Weight and mass conversions use simple multiplication factors. The metric system scales by powers of 10, while converting between metric and imperial requires specific conversion constants.
Pounds to Kilograms: kg = lbs × 0.453592
Kilograms to Pounds: lbs = kg × 2.20462
Ounces to Grams: g = oz × 28.3495
Grams to Ounces: oz = g × 0.035274
Worked Examples
- Convert 175 pounds to kilograms: kg = 175 × 0.453592 = 79.38 kg
- Convert 80 kg to pounds: lbs = 80 × 2.20462 = 176.37 lbs
- Convert 8 ounces to grams: g = 8 × 28.3495 = 226.80 g
- Convert 500 grams to pounds: lbs = 500 × 0.00220462 = 1.1023 lbs (or about 1 lb 1.6 oz)
When You Need This Converter
Weight conversion is needed in many practical situations across personal, professional, and scientific contexts:
- Cooking and Baking: International recipes often use grams and kilograms, while US recipes use ounces and pounds. Precise weight measurements are critical for baking, where flour measured by weight (grams) produces more consistent results than volume measurements (cups).
- Fitness and Health: Gym equipment, body weight tracking, and nutritional information may use different units depending on the country. Converting between pounds and kilograms is essential when following international fitness programs or tracking weight loss goals.
- Shipping and Logistics: Shipping carriers calculate costs based on weight. International shipments may require weight in kilograms, while domestic US carriers often use pounds. Accurate conversion prevents overpaying for shipping or exceeding weight limits.
- Science and Medicine: Medication dosages are often calculated per kilogram of body weight. Scientists use grams and kilograms as standard units. Lab measurements frequently need conversion between milligrams, grams, and ounces for sample preparation.
Frequently Asked Questions
There are approximately 2.20462 pounds in one kilogram. To convert kg to lbs, multiply by 2.20462. For example, 70 kg = 70 × 2.20462 = 154.32 lbs.
A US ton (short ton) equals 2,000 pounds (907.185 kg). An imperial ton (long ton) equals 2,240 pounds (1,016.047 kg). A metric tonne equals 1,000 kg (2,204.62 lbs).
There are approximately 28.3495 grams in one ounce (avoirdupois). To convert ounces to grams, multiply the ounce value by 28.3495.
There are exactly 14 pounds in one stone. Stone is commonly used in the UK and Ireland for measuring body weight. For example, 10 stone = 140 pounds = 63.5 kg.
Divide the number of pounds by 2.20462 to get kilograms. Alternatively, multiply pounds by 0.453592. For example, 150 lbs = 150 × 0.453592 = 68.04 kg.
Mass is the amount of matter in an object and is constant regardless of location. Weight is the gravitational force acting on that mass and varies by location. On the Moon, you would weigh about 1/6 of your Earth weight, but your mass remains the same.
There are exactly 1,000 milligrams in one gram. The metric system uses powers of 10, so 1 gram = 1,000 mg, 1 kilogram = 1,000 grams, and 1 metric tonne = 1,000 kilograms.
Multiply the number of ounces by 28.3495 to get grams. For example, 4 oz = 4 × 28.3495 = 113.4 grams. For baking precision, many recipes recommend using gram measurements with a kitchen scale.