Pounds to Kilograms Converter
Instantly convert pounds to kilograms, grams, ounces, stone, metric tonnes, and more — with live precision control, quick presets for common weights, composite stone & lb display, and a downloadable PDF report.
Uses the exact factors 1 lb = 0.45359237 kg, 1 lb = 16 oz, and 1 stone = 14 lb (international avoirdupois constants) — for reference only.
| Pounds | Kilograms | Grams | stone & lb |
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Pounds to Kilograms Conversion — Complete Guide for 2026
Converting pounds to kilograms is one of the most searched unit conversions on the web. Travelers check luggage against airline limits, movers and homeowners estimate the weight of furniture and appliances, DIYers read bag weights on concrete and cement, athletes translate gym plates and body weight, and anyone filling out an international form needs their weight in kilos. The conversion rests on a single exact international standard: 1 pound equals exactly 0.45359237 kilograms.
Our free Pounds to Kilograms Converter performs this calculation with 0 to 8 decimal places of precision, shows the result in stone and pounds for UK-style body weight, and converts your value across the full weight ladder — kilograms, grams, milligrams, ounces, stone, metric tonnes, and US tons. Quick presets, a log-scale comparison chart, a common-weights reference table, and a downloadable PDF report make it just as useful for a one-off check as for project documentation.
How to Use the LBS to KG Converter in 4 Steps
A complete pound-to-kilogram conversion takes a few seconds. Enter a weight or tap a preset, choose your precision, and download a PDF report you can attach to a moving estimate, shipping quote, or project file.
Enter Your Weight in Pounds
Type any pound value into the input field — whole numbers or decimals such as 154.5 lb. The calculator handles everything from a fraction of a pound (a kitchen ingredient) to millions of pounds (freight and bulk materials) with the same precision, and updates the result on every keystroke.
Or Tap a Quick Preset
Common weights are one tap away: 10, 25, 50, 100, 150, and 250 lb. Each chip shows its kilogram value so you can read the answer before you even click. The active preset stays highlighted, and typing a matching value re-selects it automatically.
Set Decimal Precision
Use the input or slider to pick 0 to 8 decimal places. One or two decimals suit body weight and luggage, two or three suit shipping and building materials, and five or more suit lab, pharmacy, or technical work. The kilogram result follows your setting; supporting units use fixed, sensible precision.
Review & Download PDF
See your weight in kilograms, grams, milligrams, ounces, stone, stone-and-pounds, metric tonnes, and US tons, plus a chart comparing the numbers. Click Download PDF for a two-page branded report with every conversion, the chart, and a highlighted reference table.
Why 1 Pound = 0.45359237 Kilograms Exactly
The pound has been used for well over a thousand years, but its exact size in kilograms was only fixed internationally on July 1, 1959, when the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa adopted the International Yard and Pound Agreement. Before that, the countries’ pounds differed in the seventh or eighth decimal place — the U.S. pound, for instance, was 0.4535924277 kg. Tiny, yes, but enough to cause headaches in precision manufacturing, scientific work, and international trade.
The agreement defined the avoirdupois pound as exactly 0.45359237 kg. The number was chosen with care: it is divisible by 7, so the grain (1/7,000 of a pound, still used for bullets, arrows, and some medicines) also has an exact metric value of 64.79891 milligrams. Unlike 1 cm in inches, 0.45359237 is a terminating decimal — there are no hidden digits beyond the eighth place.
What the 2019 kilogram redefinition changed
Because the pound is defined in terms of the kilogram, it follows whatever defines the kilogram. From 1889 until 2019, that was a platinum-iridium cylinder kept near Paris, the International Prototype Kilogram. On May 20, 2019, the kilogram was redefined in terms of the Planck constant, a fixed constant of nature. The pound-to-kilogram factor did not change at all — but both units now rest on a physical constant rather than a physical object that could gain or lose atoms over time.
For you, this means the conversion itself is perfect. The only rounding in your result is the display precision you choose, and the only real uncertainty is in the scale that produced the pound figure in the first place. Any converter that multiplies by exactly 0.45359237 gives the same correct answer; what differs between tools is how much precision they show and which supporting units and formats they include.
What the LBS to KG Converter Calculates
More than a single kilogram figure — the tool gives you a complete weight breakdown across metric, imperial, and US customary units, formatted for body weight, shipping, construction, or technical documentation.
Exact Kilograms (Hero Result)
The headline result multiplies your input by the exact factor 0.45359237. It is shown at the precision you select, with a one-line summary beneath it that also gives grams and stone-and-pounds for a quick read.
Stone & Pounds (Composite)
UK and Irish body weight is usually quoted in stone and pounds. The calculator splits your weight automatically — for example, 180 lb becomes 12 st 12 lb — so you can read a UK scale, fill in a UK form, or follow British fitness content without doing the division yourself.
Grams & Milligrams
For cooking, nutrition labels, postage, and lab work, the metric sub-units are calculated from the same exact factor: 1 lb = 453.59237 g = 453,592.37 mg. Handy when a recipe, supplement, or parcel service lists weight in grams.
Ounces & Stone
Ounces (1 lb = 16 oz) are the everyday small unit in the US for food, mail, and baby weights. Decimal stone (1 st = 14 lb) complements the composite display when you need a single number, such as in a spreadsheet or a weight-tracking log.
Metric Tonnes & US Tons
For moving estimates, freight, vehicle payloads, and bulk materials like gravel or topsoil, large weights are easier to read in tons. The calculator shows both metric tonnes (1,000 kg) and US short tons (2,000 lb), which differ by about 10%.
Chart, Reference Table & PDF
A log-scale bar chart compares your value in lb, kg, g, oz, and stone so very different magnitudes fit on one view. A reference table of common weights highlights your input when it matches, and the two-page PDF report bundles everything for sharing or record-keeping.
Pounds to Kilograms Conversion Chart — Common Values
Bookmark this page or screenshot the table below for instant reference. Every value uses the exact factor 1 lb = 0.45359237 kg, rounded to four decimal places for kilograms and one for grams. Everyday-item weights are typical examples and vary by brand.
| Pounds | Kilograms | Grams | Stone & lb | Common Use |
|---|---|---|---|---|
| 1 lb | 0.4536 kg | 453.6 g | 0 st 1 lb | Block of butter (4 sticks) |
| 5 lb | 2.2680 kg | 2,268.0 g | 0 st 5 lb | Bag of flour |
| 10 lb | 4.5359 kg | 4,535.9 g | 0 st 10 lb | Bag of potatoes |
| 16 lb | 7.2575 kg | 7,257.5 g | 1 st 2 lb | Heaviest regulation bowling ball |
| 20 lb | 9.0718 kg | 9,071.8 g | 1 st 6 lb | Grill propane (standard tank fill) |
| 25 lb | 11.3398 kg | 11,339.8 g | 1 st 11 lb | Bag of rice or pet food |
| 40 lb | 18.1437 kg | 18,143.7 g | 2 st 12 lb | Water-softener salt bag |
| 45 lb | 20.4117 kg | 20,411.7 g | 3 st 3 lb | Standard gym barbell / large plate |
| 50 lb | 22.6796 kg | 22,679.6 g | 3 st 8 lb | Common airline checked-bag limit |
| 60 lb | 27.2155 kg | 27,215.5 g | 4 st 4 lb | Bag of concrete mix |
| 70 lb | 31.7515 kg | 31,751.5 g | 5 st 0 lb | Premium-cabin checked-bag limit |
| 80 lb | 36.2874 kg | 36,287.4 g | 5 st 10 lb | Large bag of concrete mix |
| 94 lb | 42.6377 kg | 42,637.7 g | 6 st 10 lb | US bag of Portland cement |
| 100 lb | 45.3592 kg | 45,359.2 g | 7 st 2 lb | Round-number reference |
| 150 lb | 68.0389 kg | 68,038.9 g | 10 st 10 lb | Adult body weight |
| 154.32 lb | 69.9984 kg | 69,998.4 g | 11 st 0.3 lb | ≈ 70 kg (standard reference adult) |
| 180 lb | 81.6466 kg | 81,646.6 g | 12 st 12 lb | Adult body weight |
| 200 lb | 90.7185 kg | 90,718.5 g | 14 st 4 lb | Adult body weight |
| 220.46 lb | 99.9990 kg | 99,999.0 g | 15 st 10.5 lb | ≈ 100 kg |
| 250 lb | 113.3981 kg | 113,398.1 g | 17 st 12 lb | Full-size refrigerator (typical range) |
| 500 lb | 226.7962 kg | 226,796.2 g | 35 st 10 lb | Upright piano (typical range) |
| 1,000 lb | 453.5924 kg | 453,592.4 g | 71 st 6 lb | Half a US ton |
| 2,000 lb | 907.1847 kg | 907,184.7 g | 142 st 12 lb | Exactly 1 US (short) ton |
| 2,204.62 lb | 999.9988 kg | 999,998.8 g | 157 st 6.6 lb | ≈ 1 metric tonne |
| 2,240 lb | 1,016.0469 kg | 1,016,046.9 g | 160 st 0 lb | Exactly 1 UK (long) ton |
How to Convert Your Body Weight from Pounds to Kilograms
The single most common reason people look up a pounds-to-kilograms converter is body weight. U.S. scales read in pounds, but medical forms abroad, visa and travel paperwork, international fitness apps, BMI charts, and medication dosing guides usually ask for kilograms. UK and Irish sources often use stone and pounds instead.
The manual calculation
Step 1: Multiply your weight in pounds by 0.45359237 to get kilograms. Step 2 (optional, for stone): divide your pounds by 14 — the whole number is stone, the remainder is pounds. For a weight of 180 lb:
180 ÷ 14 = 12 stone, remainder 12 lb
Result: 81.65 kg (or 12 st 12 lb)
The calculator above does both steps for you. Enter your weight in pounds, and the hero result shows kilograms while the “stone & lb” card shows the UK format. Set precision to 1 or 2 decimals — bathroom scales are rarely more accurate than a few tenths of a pound.
Common body weight conversions for reference
Calculated with the exact factor and rounded to two decimal places:
- 100 lb = 45.36 kg (7 st 2 lb)
- 110 lb = 49.90 kg (7 st 12 lb)
- 120 lb = 54.43 kg (8 st 8 lb)
- 130 lb = 58.97 kg (9 st 4 lb)
- 140 lb = 63.50 kg (10 st 0 lb)
- 150 lb = 68.04 kg (10 st 10 lb)
- 160 lb = 72.57 kg (11 st 6 lb)
- 170 lb = 77.11 kg (12 st 2 lb)
- 180 lb = 81.65 kg (12 st 12 lb)
- 190 lb = 86.18 kg (13 st 8 lb)
- 200 lb = 90.72 kg (14 st 4 lb)
- 220 lb = 99.79 kg (15 st 10 lb)
- 250 lb = 113.40 kg (17 st 12 lb)
LBS to KG — Key Conversion Numbers
The LBS to KG Converter Is Built For You If…
Whether you’re planning a move, packing for an international flight, or tracking your training in kilos — this calculator gives you the exact answer in seconds, with a report you can save and share.
Movers & Homeowners
Moves, appliances & materialsLong-distance moving quotes are often based on shipment weight, appliance spec sheets from international brands list weight in kilograms, and building materials come in pound-rated bags. Converting accurately helps you compare quotes, check that a truck, dolly, or floor can handle a load, and order the right quantity of concrete, cement, or salt.
- Convert moving-estimate weights between lb and kg when comparing international movers
- Check appliance and furniture weights before stairs, elevators, or upper floors
- Use the US tons output for gravel, topsoil, and bulk material orders
- Save the PDF alongside quotes so everyone works from the same numbers
Travelers & Shippers
Luggage & parcel limitsAirlines, couriers, and postal services switch between pounds and kilograms depending on the route and carrier. A bag that looks fine in pounds can be just over a kilogram limit and trigger an overweight fee. Convert your packed weight before you leave home and leave yourself some margin.
- 50 lb ≈ 22.68 kg — just under the common 23 kg checked-bag limit
- 70 lb ≈ 31.75 kg — just under the common 32 kg heavy-bag limit
- Use 2 decimal places; luggage scales aren’t more accurate than that
- Check both units on your booking, as limits differ by fare and route
Fitness & Health Tracking
Body weight & gym loadsMany training programs, competitions, and fitness apps use kilograms, while most US gyms stock pound plates. Converting lets you follow a kg-based program on lb equipment, log progress in either unit, and read international body-weight guidance. The stone output covers UK sources as well.
- A 45 lb plate ≈ 20.41 kg, while a 20 kg plate ≈ 44.09 lb
- Log body weight at 1 decimal place to avoid tracking scale noise
- Use stone & lb output when following UK plans or forms
- Weigh at the same time of day for comparable readings in any unit
7 Tips for Accurate LBS to KG Conversions
The math is a single multiplication, but mix-ups between shortcuts, ton types, and pound types cause real mistakes — overweight bag fees, short material orders, or wrong dosing figures. These rules keep every conversion trustworthy.
Use the Exact Factor, Not “Divide by 2.2”
Dividing by 2.2 overstates kilograms by about 0.2%, and multiplying by 0.45 understates them by about 0.8%. That’s fine for a rough idea but adds up fast on heavy loads — 0.8% of a 10,000 lb shipment is 80 lb. Use 0.45359237 whenever the number matters.
Match Precision to Your Use Case
One or two decimals are plenty for body weight and luggage. Two or three suit shipping and building materials. Five or more are only meaningful for lab, pharmacy, or calibration work where the source measurement is equally precise. Extra decimals never make a rough scale reading more accurate.
Confirm Which “Ton” Is Meant
A US short ton is 2,000 lb (907.18 kg), a UK long ton is 2,240 lb (1,016.05 kg), and a metric tonne is 1,000 kg (2,204.62 lb). On freight quotes, vehicle ratings, and bulk material orders, a mismatch can mean a 10–12% difference. Ask if the document doesn’t say.
Don’t Use This for Gold or Silver
Precious metals use the troy system. A troy ounce is 31.1035 g, about 10% heavier than the everyday ounce (28.3495 g), and a troy pound has only 12 ounces. This calculator uses the standard avoirdupois pound, which is correct for everything except bullion and jewelry metals.
Read the Unit Twice on Labels
Product labels, spec sheets, and shipping forms often print both units, and it’s easy to read the wrong column. Some appliance sheets list net weight in kg and shipping weight in lb. Confirm which unit and which weight (net, gross, or shipping) you’re converting before you rely on the result.
Use Stone Only Where It’s Expected
Stone is common for body weight in the UK and Ireland but almost unused elsewhere, and never for luggage, freight, or goods. Give body weight in stone and pounds for UK readers, and in kilograms for everyone else, including UK medical settings, which generally record weight in kilograms.
Learn the “Halve, Then Minus 10%” Shortcut
To estimate kilograms in your head, halve the pounds and subtract 10% of that result: 180 lb → 90 → 81 kg (exact: 81.65). Going the other way, double the kilograms and add 10%: 70 kg → 140 → 154 lb (exact: 154.32). It’s within about 1% — good enough to catch obvious errors.
LBS to KG Converter — Frequently Asked Questions
Everything you need to know about converting pounds to kilograms, the history behind the 0.45359237 standard, and how to apply this calculator to real-world weighing tasks.
Multiply the number of pounds by 0.45359237. That factor is exact: 1 pound is defined as exactly 0.45359237 kilograms. For example, 100 lb × 0.45359237 = 45.359237 kg.
The definition comes from the 1959 International Yard and Pound Agreement, so it is not an approximation. Our calculator performs the multiplication with double-precision arithmetic and lets you display 0 to 8 decimal places, so the only rounding comes from the precision setting you choose.
The exact formula is: kilograms = pounds × 0.45359237. To go the other way: pounds = kilograms ÷ 0.45359237, which is the same as kilograms × 2.20462262 (rounded).
Quick references: 1 lb ≈ 0.4536 kg, 10 lb ≈ 4.536 kg, 50 lb ≈ 22.68 kg, 100 lb ≈ 45.36 kg, and 2.2046 lb ≈ 1 kg.
The International Yard and Pound Agreement of 1959, signed by the United States, United Kingdom, Canada, Australia, New Zealand, and South Africa, defined the avoirdupois pound as exactly 0.45359237 kg. Before that, national pounds differed very slightly; the U.S. pound, for example, was 0.4535924277 kg.
The 1959 value was chosen to be divisible by 7 so the grain (1/7,000 of a pound) would also have an exact metric value of 64.79891 milligrams.
Using the exact factor:
100 lb = 45.36 kg · 120 lb = 54.43 kg · 130 lb = 58.97 kg · 140 lb = 63.50 kg · 150 lb = 68.04 kg · 160 lb = 72.57 kg · 170 lb = 77.11 kg · 180 lb = 81.65 kg · 190 lb = 86.18 kg · 200 lb = 90.72 kg · 220 lb = 99.79 kg · 250 lb = 113.40 kg.
Enter any exact weight in the calculator above for up to 8 decimal places.
Divide kilograms by 0.45359237, or multiply by 2.20462262. For example:
20 kg = 44.09 lb · 25 kg = 55.12 lb · 50 kg = 110.23 lb · 70 kg = 154.32 lb · 100 kg = 220.46 lb.
This converter takes pounds as its input; to check a kilogram value, enter the pound figure you calculated and confirm the kilogram result matches.
1 pound equals exactly 0.45359237 kilograms, or 453.59237 grams. For everyday purposes it is usually rounded to 0.454 kg or 0.45 kg.
Unlike 1 cm in inches, this value terminates: 0.45359237 is the complete, exact number, so no further decimal places exist.
One stone equals exactly 14 pounds. Divide your weight in pounds by 14; the whole number is the stone and the remainder is the leftover pounds. For example, 180 lb ÷ 14 = 12 with 12 left over, so 180 lb is 12 st 12 lb.
Stone is still widely used for body weight in the United Kingdom and Ireland. The calculator shows this format automatically in the “stone & lb” summary card.
Yes. Both mean pounds. The abbreviation lb comes from the Latin libra, a Roman unit of weight. Technically “lb” is used for both singular and plural (1 lb, 10 lb), but “lbs” is common and widely understood in everyday writing.
Either way, the conversion factor to kilograms is the same: 1 lb = 0.45359237 kg.
A kilogram is heavier. One kilogram equals about 2.2046 pounds, so a kilogram is a little more than twice as heavy as a pound. Put the other way, a pound is a little less than half a kilogram (0.4536 kg).
The kilogram is the SI base unit of mass and has been defined by the Planck constant since May 20, 2019. Because the pound is defined as a fixed fraction of the kilogram, it inherits that same modern definition.
The avoirdupois pound (16 ounces, 453.59237 g) is the everyday pound used for body weight, groceries, freight, and almost everything else. The troy pound (12 troy ounces, 373.2417216 g) is used only for precious metals, and in practice gold and silver are priced per troy ounce (31.1034768 g) rather than per troy pound.
This calculator uses the avoirdupois pound. For bullion, convert troy ounces separately.
A US (short) ton is 2,000 lb, or 907.18474 kg. A UK (long) ton is 2,240 lb, or 1,016.0469088 kg. A metric tonne is 1,000 kg, or about 2,204.62 lb.
The calculator shows both metric tonnes and US tons. When a contract, freight quote, or material order says “ton,” confirm which one is meant; the gap between a short ton and a long ton is 12%.
The calculator uses the exact factor 1 lb = 0.45359237 kg with double-precision floating-point arithmetic, accurate to about 15 significant digits — far beyond any practical weighing need.
Display precision is adjustable from 0 to 8 decimal places. Your scale, not the conversion, is almost always the limiting factor: most bathroom scales are accurate to roughly 0.1 to 0.2 lb.
Accuracy note: The HomeExpertly Pounds to Kilograms Converter uses the exact international conversion factor of 1 pound = 0.45359237 kilograms (avoirdupois), as established by the 1959 International Yard and Pound Agreement and recognized by the U.S. National Institute of Standards and Technology (NIST) and the International Bureau of Weights and Measures (BIPM). All calculations are mathematically precise to the decimal precision you select (up to 8 places). However, results are for informational and reference purposes only. For applications where weight accuracy is critical — including but not limited to medication dosing, medical diagnostics, legally binding contracts, freight and customs declarations, structural load calculations, precious-metal transactions, or scientific publication — always verify your conversions independently and use calibrated, certified weighing equipment. Everyday-item weights shown in the reference table are typical examples and vary by manufacturer. Display rounding at lower precision levels (0–3 decimal places) may introduce minor differences from the mathematically exact result. HomeExpertly is not responsible for any consequences arising from the use of these conversions, including but not limited to overweight fees, incorrect material orders, or specification mismatches. When in doubt, weigh twice, use the highest available precision, and consult a qualified professional for weight-critical applications.