Weight & Mass

Convert weight and mass between metric and imperial: grams, kilograms, pounds, ounces, stones and metric tonnes. Every factor is exact, so a round trip returns the number you started with.

24 free weight & mass tools, no signup.

• Force ConverterConvert force between newtons, kilonewtons, pounds-force, kilograms-force, dynes, and more.
• Grams to Kilograms ConverterConvert grams to kilograms instantly, and kilograms back to grams. One kilogram is exactly 1,000 grams.
• Grams to Milligrams ConverterConvert grams to milligrams instantly, and milligrams back to grams. Based on the exact 1 g = 1000 mg SI definition.
• Grams to Ounces ConverterConvert grams to ounces instantly, and ounces back to grams. Based on the exact 1 ounce = 28.349523125 g definition.
• Grams to Pounds ConverterConvert grams to pounds instantly, and pounds back to grams. Based on the exact 1 pound = 453.59237 grams definition.
• KG to Lbs ConverterConvert kilograms to pounds instantly, and pounds back to kg. Based on the exact 1 lb = 0.45359237 kg definition.
• Kg to Newtons ConverterConvert kilograms of mass to weight in newtons using standard gravity. Enter the mass and get newtons and pounds-force.
• KG to Stone ConverterConvert kilograms to stone instantly, and stone back to kilograms. Based on 1 stone = 14 pounds = 6.35029318 kg.
• Kilograms to Grams ConverterConvert kilograms to grams instantly, and grams back to kilograms. One kilogram is exactly 1,000 grams.
• Lbs to KG ConverterConvert pounds to kilograms instantly, and kg back to pounds. Based on the exact 1 lb = 0.45359237 kg definition.
• Lbs to Ounces ConverterConvert pounds to ounces instantly, and ounces back to pounds. Based on the exact 1 lb = 16 oz definition.
• Lbs to Stones ConverterConvert pounds to stones instantly, and stones back to pounds. Based on the exact 1 stone = 14 lb definition.
• Mcg to Mg ConverterConvert micrograms to milligrams and back. Enter a dose in mcg and read the result in milligrams or grams.
• Milligrams to Grams ConverterConvert milligrams to grams instantly, and grams back to milligrams. Based on the exact 1 g = 1000 mg SI definition.
• Newtons to Kg ConverterConvert newtons to kilograms-force and back. Enter a force in newtons and read the kilograms-force and pounds-force.
• Newtons to Pounds ConverterConvert newtons to pounds-force and back. Enter a force in newtons and read the result in pounds-force and kilograms-force.
• Ounces to Grams ConverterConvert ounces to grams and back, plus kilograms and pounds, for cooking and shipping.
• Ounces to Lbs ConverterConvert ounces to pounds instantly, and pounds back to ounces. Based on the exact 1 lb = 16 oz definition.
• Pounds to Grams ConverterConvert pounds to grams instantly, and grams back to pounds. Based on the exact 1 lb = 453.59237 g definition.
• Pounds to Newtons ConverterConvert pounds-force to newtons and back. Enter a force in pounds-force and read the result in newtons and kilonewtons.
• Stones to Kilograms ConverterConvert stones to kilograms and back, plus pounds, for body weight and more.
• Stones to Pounds ConverterConvert stones to pounds and back, plus kilograms, for body weight.
• Tons to Kilograms ConverterConvert metric tons to kilograms and back. Enter a mass in tonnes and read the result in kilograms, grams, or pounds.
• Weight ConverterConvert weight and mass between kg, g, mg, tons, pounds, ounces, and stone. Exact conversions with a one-click swap.