Weight Converter

Weight conversion is needed for cooking, fitness, shipping, and science. Converting between metric and imperial units involves non-round numbers, making a calculator much easier than doing it by hand.

• Fitness and body weight: Convert body weight between kg and pounds when using apps or equipment calibrated for different units.
• Cooking and baking: Recipes in grams vs. ounces: convert quickly for accurate measurements.
• Shipping and logistics: Convert package weights for international shipping rate calculations.
• Science labs: Convert between mg, g, and kg for experiments and measurements.

1. 1Enter the weight value you want to convert.
2. 2Select the source unit from the dropdown (mg, g, kg, t, oz, lb, or st).
3. 3Select the target unit.
4. 4The calculator converts to kilograms internally, then converts to the target unit.
5. 5All other unit equivalents are shown in the secondary results.

• Confusing mass and weight: Kilograms and pounds measure mass. Newtons measure force (weight). In everyday use the terms are interchangeable, but in physics and engineering, mass and weight are different quantities.
• Mixing troy ounces with standard ounces: The ounce here is the avoirdupois ounce (28.35 g) used for food and everyday goods. Precious metals use the troy ounce (31.1 g). Do not use this calculator for gold or silver weights.
• Forgetting that "metric ton" and "short ton" differ: A metric tonne is 1,000 kg. A US short ton is 2,000 pounds (~907 kg). A British long ton is 2,240 pounds (~1,016 kg). This calculator uses the metric tonne.
• Rounding too early in a multi-step calculation: If you are converting through multiple units (lbs to kg to g), carry the full decimal until the final step. Rounding early compounds the error.

• Use kg as your anchor unit: Kilograms are the SI base unit for mass. When working between multiple weight systems, convert to kg first, then to the target unit. The calculator does this internally.
• Check the coverage rate on shipping labels: Many international couriers charge by volumetric weight rather than actual weight. Calculate actual weight here, then compare with the volumetric weight formula your carrier uses.
• Memorize a few key conversions: 1 kg = 2.205 lb, 1 lb = 454 g, 1 stone = 14 lb. These three let you estimate in your head and use the calculator to verify. The estimates are usually close enough for everyday use.
• Use "all equivalents" for cooking reference: The secondary results show every unit at once. Screenshot it as a quick-reference card when you are working from a recipe that mixes metric and imperial measurements.