Weight Calculator

Convert between weight and mass units including pounds, kilograms, ounces, and grams.

Result

Fill in the fields above, then press Calculate.

A weight converter translates between common mass units including grams, kilograms, pounds, ounces, stone, and tons for everyday and scientific use.

Enter the weight value, select the source unit and target unit. The calculator converts between milligrams, grams, kilograms, ounces, pounds, stone, US tons, and metric tonnes.

Examples

Pounds to kilograms

150 lb x 453.592 g/lb / 1000 g/kg = 68.039 kg.

Stone to pounds

12 stone x 14 lb/stone = 168 lb.

Frequently Asked Questions

What is the difference between mass and weight?
Mass is the amount of matter in an object (measured in kg), while weight is the force of gravity on that mass (measured in Newtons). On Earth's surface, they are proportional, so we use them interchangeably in everyday life.
What is the difference between a US ton and a metric tonne?
A US (short) ton is 2,000 pounds (907.185 kg). A metric tonne is 1,000 kg (2,204.62 lb). A UK (long) ton is 2,240 lb (1,016.05 kg).
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Quick Tips

  • •Stone is commonly used in the UK and Ireland for body weight (1 stone = 14 pounds).
  • •A US ton (short ton) = 2,000 lb. A metric tonne = 1,000 kg = 2,204.6 lb.
  • •For cooking, 1 ounce = 28.35 grams.