2 = 90 Find 10% of that result: 10% of 90 = 9 Subtract: 90 - 9 = 81 kg This gives you a very fast and accurate estimate. The exact answer is 81.64 kg, so your mental math is less than 1% off. How to Include Ounces (oz) Since there are 16 ounces (oz) in 1 pound (lb), you must first convert your ounces to decimal pounds by dividing them by 16. Example: Convert 150 lbs, 5 oz to kg. Convert ounces to decimal pounds: 5 oz

Calculators in 2 = 90 Find 10% of that result: 10% of 90 = 9 Subtract: 90 - 9 = 81 kg This gives you a very fast and accurate estimate. The exact answer is 81.64 kg, so your mental math is less than 1% off. How to Include Ounces (oz) Since there are 16 ounces (oz) in 1 pound (lb), you must first convert your ounces to decimal pounds by dividing them by 16. Example: Convert 150 lbs, 5 oz to kg. Convert ounces to decimal pounds: 5 oz.