KG to LBS Converter — Convert Kilograms to Pounds (Exact: lb = kg × 2.20462262185)
High-accuracy kilograms (kg) to pounds (lb) converter using the exact avoirdupois factor 1 kg = 2.20462262185 lb. Built for fitness tracking, shipping & logistics, nutrition labels, manufacturing, science, and e-commerce.
Uses the exact international avoirdupois definition: 1 kg = 2.20462262185 lb. Explore all of our weight metric conversion calculator.
About Kilograms to Pounds Conversion
Kilogram (kg) is the SI base unit for mass and the standard across science and most of the world. Pound (lb) remains common in the United States for body weight, food packaging, shipping, and retail. Accurately converting kg → lb helps teams reconcile product catalogs, fitness logs, nutrition panels, warehouse systems, and shipping APIs without confusing end users. For broader context and more tools, our weight conversion calculator groups every mass converter in one place.
KG to LBS Formula
Exact relationship
Multiply kilograms by the exact avoirdupois factor:
lb = kg × 2.20462262185Example:
70 kg × 2.20462262185 = 154.32358353 lb → 154.32 lb (2 d.p.)Reverse calculation (lb → kg)
Use the exact inverse:
kg = lb × 0.45359237 // equivalently kg = lb ÷ 2.20462262185Related Weight Converters
What is a Kilogram?
The kilogram is defined via the Planck constant and underpins most engineering, scientific, and industrial measurements. Because kg integrates cleanly with other SI units, it’s favored for manufacturing specs, lab notebooks, and global data exchange.
What is a Pound (Avoirdupois)?
The international avoirdupois pound is defined as exactly 0.45359237 kg. It’s the unit you’ll see on U.S. scales, nutrition labels, and parcel weights—distinct from the troy system used for precious metals.
Step-by-Step: Converting kg to lb
- Record the mass in kg.
- Multiply by 2.20462262185.
- Choose a display precision (e.g., 1–2 decimals for consumer use).
- Label units clearly as lb (avoirdupois).
Walkthrough:
Parcel: 5.7 kg × 2.20462262185 = 12.56635 lb → 12.57 lb on label
Barbell: 20 kg plate → 44.09245 lb; pair = ~88.18 lb totalCommon Conversions
Everyday quick checks
| kg | lb |
|---|---|
| 1 | 2.20462 |
| 5 | 11.02311 |
| 10 | 22.04623 |
| 20 | 44.09245 |
| 50 | 110.23113 |
| 70 | 154.32358 |
| 100 | 220.46226 |
Precision, Rounding & Significant Figures
Operational rounding
Fitness apps typically use one decimal. Shipping and product pages often use two decimals. Scientific and manufacturing records may use three or more. Keep raw values unrounded in storage and calculations; round once when displaying to users.
Consistent documentation
Use clear field names (e.g., mass_kg, mass_lb). Note the constant: “1 kg = 2.20462262185 lb (international avoirdupois).” This prevents ambiguity when teams mix metric and imperial specs.
Where This Converter Is Used
- 🏋️ Fitness & health: Body-weight tracking, gym programming, strength progress posts.
- 📦 Shipping & logistics: Parcel labels, carrier APIs, customs paperwork.
- 🥫 Food & nutrition: Recipe scaling, meal prep, macro tracking, retail packaging.
- 🏭 Manufacturing & QA: Bill of materials, inventory weights, tolerance checks.
- 🧪 Science & education: Lab exercises and classroom conversions without confusion.
- 🛍️ E-commerce: Product specs for mixed U.S./international audiences.
Quick Reference Table
| lb | kg |
|---|---|
| 10 | 4.53592 |
| 25 | 11.33981 |
| 50 | 22.67962 |
| 100 | 45.35924 |
| 150 | 68.03886 |
| 200 | 90.71847 |
Frequently Asked Questions
What is the exact formula for converting kilograms to pounds?
Use the precise avoirdupois identity: lb = kg × 2.20462262185. The pound used here is the international avoirdupois pound (exactly 0.45359237 kg). Multiply your kg value by 2.20462262185 to get pounds.
Why do some sources show 2.2 instead of 2.20462?
2.2 is a mental-math shortcut that’s fine for casual estimates, but it under-counts by ~0.21%. For fitness progress, dosing, manufacturing specs, or shipping labels, use the exact constant 2.20462262185 and round only at display time.
Are there different 'pounds' (troy vs avoirdupois)?
Yes. Precious-metal markets use the troy pound, which is different. Everyday mass and body-weight use the international avoirdupois pound. This tool converts kilograms ↔ avoirdupois pounds only.
How should I round in reports or apps?
Pick a policy per audience: fitness and consumer apps often show one decimal place; shipping labels typically show two; scientific/industrial logs may keep more. Keep full precision internally, round once for presentation, and document the constant used.
What’s 70 kg in pounds? What about 5 kg?
70 kg × 2.20462262185 = 154.3236 lb (≈ 154.3 lb). 5 kg × 2.20462262185 = 11.0231 lb (≈ 11.02 lb). Use the calculator for any value and choose your desired rounding.
How do I convert pounds back to kilograms?
Use the inverse mapping: kg = lb × 0.45359237. You can also divide by 2.20462262185. Convert once at input/output boundaries to avoid compounding rounding error.
Is body weight measured in mass or force—does it matter here?
In everyday language we treat 'weight' as mass. This converter maps mass units (kg ↔ lb). If you’re doing physics or engineering with forces, use newtons (N). For consumer and logistics use, kg ↔ lb is standard.
How can I sanity-check a spreadsheet or API pipeline?
Use anchors: 1 kg → 2.20462262185 lb; 10 kg → 22.0462262185 lb; 100 kg → 220.462262185 lb. Check that your outputs match before rounding and that your system isn’t applying the 2.2 shortcut upstream.
Tips for Working with KG & LB
- Label explicitly as lb (avoirdupois) if your audience might confuse troy vs avoirdupois.
- Convert once at system edges; keep full precision internally and round at display.
- If users also track stones, link to a stones converter for clarity.
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