An online lb (pound) and Kg (kilogram) conversion calculator is presented along with conversion formulas, step-by-step examples, and practical word problems.
Abbreviations:
By international agreement:
\[ 1 \text{ lb} = 0.45359237 \text{ Kg} \] \[ 1 \text{ Kg} = \left(\frac{1}{0.45359237}\right) \text{ lb} \approx 2.20462262185 \text{ lb} \]Reference: NIST Reference Guidelines
Convert \( 12.5 \, \text{lb} \) into Kg and round the answer to 1 decimal place.
Rounding to 1 decimal place gives:
\[ 5.7 \, \text{Kg} \]Convert \( 1.56 \, \text{kg} \) into lb and round the answer to 1 decimal place.
Rounding to 1 decimal place gives:
\[ 3.4 \, \text{lb} \]Enter the number of pounds (lb) or kilograms (kg) to be converted and calculate.
A cow consumes 2% of its body weight daily. How many days will \( 10,000 \, \text{Kg} \) of cow feed last for a cow whose weight is \( 1,600 \, \text{lb} \)? Round your answer to the nearest whole number.
Let \( W \) be 2% of the body weight of the cow:
\[ W = 2\% \times 1600 \, \text{lb} = 32 \, \text{lb} \]Convert the available cow feed to pounds:
\[ 10,000 \, \text{Kg} = 10,000 \times 2.20462262185 \, \text{lb} \approx 22,046.2262185 \, \text{lb} \]The number \( N \) of days the feed will last is:
\[ N = \dfrac{22,046.2262185 \, \text{lb}}{32 \, \text{lb}} \approx 688.944569 \, \text{days} \]Rounding to the nearest whole number of days:
\[ N = 689 \text{ days} \]A restaurant uses \( 5 \, \text{Kg} \) of potatoes and \( 2 \, \text{Kg} \) of carrots every day. Potatoes are sold in bags of \( 5 \, \text{lb} \) and carrots in bags of \( 0.5 \, \text{lb} \). A bag of potatoes costs $7 and a bag of carrots costs $3. How much does this restaurant spend on potatoes and carrots in 30 days?
In 30 days, the total potatoes used:
\[ 30 \times 5 \, \text{Kg} = 150 \, \text{Kg} \]Convert \( 150 \, \text{Kg} \) into pounds:
\[ 150 \, \text{Kg} = 150 \times 2.20462262185 \, \text{lb} \approx 330.693393 \, \text{lb} \]Number \( N_1 \) of potato bags needed (rounded up to the next higher whole number):
\[ N_1 = \dfrac{330.693393}{5} \approx 66.1387 \implies 67 \text{ bags} \]In 30 days, the total carrots used:
\[ 30 \times 2 \, \text{Kg} = 60 \, \text{Kg} \]Convert \( 60 \, \text{Kg} \) into pounds:
\[ 60 \, \text{Kg} = 60 \times 2.20462262185 \, \text{lb} \approx 132.277357 \, \text{lb} \]Number \( N_2 \) of carrot bags needed (rounded up to the next higher whole number):
\[ N_2 = \dfrac{132.277357}{0.5} \approx 264.5547 \implies 265 \text{ bags} \]Total cost \( C \) for 30 days:
\[ C = 67 \times \$7 + 265 \times \$3 = \$469 + \$795 = \$1,264 \]One pound of boneless chicken costs $10. How much does a kilogram of boneless chicken cost?
Convert the unit cost from per pound to per kilogram:
\[ \$10 / \text{pound} = \dfrac{\$10}{0.45359237 \, \text{Kg}} \approx \$22.046226 \, \text{Kg} \]Rounding to the nearest cent gives:
\[ \$22.05 / \text{kg} \]