Weight Calculator
Free Weight Calculator for math. Enter values to solve step-by-step with verified formulas, worked examples, and detailed explanations. Free math tool.
Formula
Output = Input × (From Unit Factor ÷ To Unit Factor)
Convert through kilograms as base unit. Multiply input by the 'from' conversion factor, then divide by the 'to' conversion factor.
Worked Examples
Example 1: Body Weight Conversion
Problem:Convert 175 pounds to kilograms and stones.
Solution:Pounds to kg:\n175 lb ÷ 2.205 = 79.4 kg\n\nPounds to stones:\n175 ÷ 14 = 12 stone 7 lbs\n(175 = 12×14 + 7)
Result:79.4 kg or 12st 7lb
Example 2: Shipping Weight
Problem:A package weighs 2.5 kg. What is this in pounds and ounces?
Solution:Kg to pounds:\n2.5 × 2.205 = 5.51 lb\n\nTo pounds and ounces:\n5 lb + (0.51 × 16) oz\n= 5 lb 8.2 oz
Result:5 lb 8.2 oz
Example 3: Recipe Conversion
Problem:A recipe calls for 8 oz of flour. How many grams is that?
Solution:Ounces to grams:\n8 oz × 28.35 = 226.8 g\n\nFor baking, round to:\n225-230 grams
Result:227 grams
Frequently Asked Questions
What's the difference between mass and weight?
Mass (kg) is the amount of matter, constant everywhere. Weight (Newtons) is gravitational force on mass, varying by location. On Earth, we often use 'weight' to mean mass in everyday language.
How do I convert my body weight?
For kg to lb: multiply by 2.205. For lb to kg: divide by 2.205. For stones: divide pounds by 14. A 70kg person weighs 154 lb or 11 stone.
What's the smallest common weight unit?
Milligrams (mg) for everyday use, micrograms (μg) for medicine/science. 1 gram = 1000 mg = 1,000,000 μg. A grain of salt weighs about 60 mg.
How accurate should weight conversions be?
For cooking: 1 decimal place. For shipping: whole numbers usually. For science/medicine: 3+ decimal places. For jewelry: 2-3 decimals. Context determines needed precision.