Weight Converter
Each unit is converted through kilograms as the base unit.
Choose the weight units
Enter the weight value, choose the starting unit and choose the unit you want. Common options include pounds, kilograms, ounces, grams, stones and tons.
Use this for recipes, shipping weights, gym tracking, health app entries and product listings. For personal records, keep one main unit so progress is easier to compare.
If the source is written in stones and pounds, convert the stones into pounds first. Then add the remaining pounds before converting to kilograms.
When a form asks for whole numbers only, convert first and then round. Do not round the original value before conversion.
Mass versus displayed weight
The result is the same weight or mass expressed with another unit label. The object did not change. Only the measurement system changed.
Pounds and ounces are common in the US. Kilograms and grams are common in metric contexts. Stones are still used by many people for body weight in the UK and Ireland.
For everyday conversion, the terms weight and mass are often used loosely. Scientific contexts may distinguish them more carefully.
For shopping or shipping, the practical question is usually the number printed on the scale. Use the unit the carrier or label expects.
Kilograms as the bridge unit
The converter uses standard factors. One pound is about 0.453592 kilograms. One kilogram is about 2.20462 pounds. One stone is 14 pounds.
Ounces are smaller units. One pound is 16 ounces. One kilogram is 1,000 grams.
For accurate work, convert through grams or kilograms and round at the end. That keeps repeated conversions from drifting.
For stones and pounds, turn the mixed value into total pounds first. Mixed notation should not be treated as a decimal.
Pounds to kilograms example
To convert 150 pounds to kilograms, multiply by 0.453592. The result is about 68.04 kilograms.
To convert 10 stone 5 pounds to pounds, calculate 10 x 14 = 140, then add 5. The result is 145 pounds.
145 pounds is about 65.77 kilograms. Rounding to 65.8 kg is usually enough for everyday tracking.
Ounces, pounds, and tons
The most common mistake is forgetting that one stone is 14 pounds. A stone and pound entry is not a decimal number.
Another mistake is confusing ounces by weight with fluid ounces. Ounces can measure weight, while fluid ounces measure volume.
Also avoid overreading rounded values. A bathroom scale, shipping scale or food label may already be rounded before you convert it.
Weight Converter FAQ
How many pounds are in a stone?
One stone equals 14 pounds. To convert stones to pounds, multiply the stone value by 14.
If there are extra pounds, add them after multiplying.
For example, 12 stone 7 pounds is 12 x 14 plus 7, which equals 175 pounds.
How do I convert pounds to kilograms?
Multiply pounds by 0.453592. For a quick estimate, divide pounds by about 2.2.
For example, 180 pounds is about 81.65 kilograms.
Use the exact factor when the result matters. Use the estimate when you only need a quick mental check.
If you are entering a medical, shipping or sports value, match the rounding requested by that system.
How do I convert kilograms to pounds?
Multiply kilograms by about 2.20462. For example, 70 kilograms is about 154.32 pounds.
If you only need a rough estimate, multiply by 2.2.
Keep one or two decimals for everyday use unless a form asks for whole pounds.
For body weight tracking, consistency is more important than switching units often. Pick one unit and compare like with like.
Are ounces and fluid ounces the same?
No. Ounces measure weight or mass in this calculator. Fluid ounces measure volume.
A fluid ounce of one liquid does not always weigh one ounce because density can differ.
Use a volume converter for fluid ounces, cups, pints or liters.
How much should I round weight conversions?
Round based on the source measurement. If your scale shows one decimal place, the converted result does not need five decimals.
For body weight tracking, one decimal place in kilograms or pounds is usually enough.
For shipping or lab work, follow the precision required by the carrier, form or procedure.
When in doubt, keep the unrounded result in your notes and enter the rounded value only where required.