Kg to Lbs and Back: A Plain Guide to Converting Weight

Weight is one of those measurements that flips between systems depending on where you are and what you're doing. A recipe lists grams, your bathroom scale shows stone, a US shipping form wants pounds, and the gym plates are in kilograms. Converting between them is simple once you know a handful of factors — here they are, along with the mental shortcuts worth memorising.

The one conversion most people need: kg and lbs

The metric–imperial pairing that comes up most is kilograms and pounds. There's a single factor in each direction:

For a quick mental estimate, doubling the kilograms and adding a bit gets you close: 70 kg × 2.2 ≈ 154 lb. Going the other way, halving the pounds slightly overestimates the kilograms (154 ÷ 2.2 = 70). When you need the exact figure — for a passport form, a freight label or a medication dose — the weight & mass converter shows the answer in every unit at once as you type.

Stone, pounds and ounces

The imperial system stacks its own units, which is where people trip up:

• 1 stone = 14 pounds. So 11 stone 6 lb is (11 × 14) + 6 = 160 lb, which is about 72.6 kg.
• 1 pound = 16 ounces. Ounces show up in cooking and postage rather than body weight.
• 1 ounce ≈ 28.35 grams, and 1 pound ≈ 453.6 grams — handy when a recipe mixes metric and imperial.

British scales often report body weight in stone and pounds, while medical settings use kilograms, so converting between the two is a common everyday task. Remember that stone-and-pounds is a mixed unit: you can't just convert the stone and ignore the pounds.

Grams, kilograms and tonnes

Within the metric system, everything moves by factors of a thousand, which makes it far easier than imperial:

This is why scientists and most of the world prefer metric for weight — there are no odd factors like 14 or 16 to remember, only powers of ten. If you're weighing ingredients, the cooking converter handles the volume-to-weight side of recipes too.

Weight versus mass (and why it rarely matters here)

Strictly, a kilogram measures mass (how much matter there is) while a pound of force measures weight (the pull of gravity on that mass). On Earth's surface the two track each other so closely that everyday conversions treat them as the same thing — which is why this tool, and this guide, use "weight" and "mass" interchangeably. The distinction only bites in physics problems or off the planet.

For a broader look at why the two measurement systems exist side by side, see our guide to metric vs imperial. And if you're converting temperatures for the same recipe or trip, temperature scales explained covers Celsius and Fahrenheit the same way.