Kilograms to Pounds Converter

How to convert kilograms to pounds (the formula)

To convert kilograms to pounds, multiply by 2.20462: pounds = kilograms × 2.2046226. The factor comes from the definition of the pound as exactly 0.45359237 kilograms, so dividing 1 by that value gives the kilogram-to-pound factor of 2.2046226218…, a repeating decimal.

Two examples: 70 kg × 2.20462 = 154.32 lb, and 100 kg × 2.20462 = 220.46 lb. Because a kilogram is heavier than a pound, the pound value is always the larger number, a fast way to check you multiplied rather than divided.

This page converts live in both directions. Enter kilograms and the pounds box fills in; enter pounds and the kilograms update instead. That is useful when a gym scale reads in one unit and a food label or shipping form asks for the other.

Why one kilogram is 2.20462 pounds

The pound is defined as exactly 0.45359237 kilograms, a value set by the 1959 international yard-and-pound agreement, which also fixed the inch at 2.54 cm. Because the pound is defined in terms of the kilogram, the kilogram is the primary unit and the pound is the derived one. Inverting the definition gives 1 kg = 1 ÷ 0.45359237 = 2.2046226218… lb.

That trailing decimal never terminates, which is why you see the factor written as 2.20462 or 2.2046 depending on the precision a source uses. For almost all everyday purposes, body weight, luggage, produce, 2.20462 is far more precise than you need.

Since 2019 the kilogram itself has been defined by fixing the Planck constant at 6.62607015 × 10⁻³⁴ J·s, which ties the mass unit to fundamental physics rather than to a metal cylinder in France. NIST SP 811 and the BIPM's SI Brochure document both the kilogram definition and the exact pound relationship.

Kilograms to pounds conversion chart

Both directions for the values people search for most. The kilogram-to-pound column is rounded to four decimal places.

Anchor to remember: 1 kg is a little over 2.2 pounds, so 10 kg is a bit over 22 pounds and 50 kg is about 110 pounds.

Worked examples: body weight, luggage and shipping

Four kilogram-to-pound conversions US users ask for most, worked with the exact factor.

• Body weight: 70 kg × 2.20462 = 154.32 lb. This is the classic conversion when a metric scale meets a US weight goal.
• Luggage: 23 kg × 2.20462 = 50.71 lb, the standard international checked-bag limit.
• Shipping: a 30 kg parcel is 30 × 2.20462 = 66.14 lb.
• Barbell plates: 20 kg × 2.20462 = 44.09 lb, close to the familiar 45 lb plate.

The luggage case is a good one to internalize: many airlines set the checked-bag limit at 23 kg, which is 50.7 lb, slightly over the US "50-pound" limit. Checking your bag at home against the airline's stated unit avoids an overweight fee at the counter.

Mass vs weight: the kilogram confusion

Strictly speaking, the kilogram measures mass and the pound is often used for weight, but in everyday conversion the two are treated as the same kind of quantity, and that is what this tool does.

Mass is how much matter an object contains and does not change with location. Weight is the force gravity exerts on that mass, and it does change: an object weighs slightly less at high altitude or on the Moon. In the SI system, mass is measured in kilograms and force (weight) in newtons. In US customary units, mass is technically measured in slugs, but in ordinary life the pound is used for both mass and weight, a "150-pound person" is a statement about mass as commonly understood.

For conversions at the surface of the Earth, this distinction does not affect the arithmetic: 1 kg of mass corresponds to the familiar 2.20462 lb. It only becomes important in physics or engineering problems where you must convert between mass and force, which requires the local gravitational acceleration.

Kilograms to pounds mistakes to avoid

These are the slips that produce wrong kilogram-to-pound answers.

• Dividing instead of multiplying. Kilograms are heavier, so the pound value must be larger. If your pounds number is smaller, you divided.
• Using 2 instead of 2.2. The factor is 2.20462, not 2. Using 2 understates the result by about 10%, 10 kg would read 20 lb instead of 22 lb.
• Confusing kg with lb in a formula. Nutrition and shipping forms sometimes label fields ambiguously. Read the unit symbol before entering a number.
• Rounding too early. Keep full precision until the final step, especially for medical or shipping weights where a small error matters.

Quick check: since 1 kg is about 2.2 lb, a 100 kg value should land near 220 lb. If it does not, you used the wrong operation.

Kilograms to pounds for fitness goals

Anyone tracking a body-weight goal across a metric and an imperial scale runs this conversion constantly, so a few reference numbers are worth committing to memory.

• 1 kg = 2.20462 lb
• 50 kg = 110.23 lb
• 70 kg = 154.32 lb
• 80 kg = 176.37 lb
• 90 kg = 198.42 lb
• 100 kg = 220.46 lb

The trick to reading these fast is the anchor at 100 kg = 220.46 lb. From there, each additional kilogram is about 2.2 pounds, and each kilogram removed takes off about 2.2 pounds. A 5 kg change is roughly 11 pounds, a meaningful shift on a scale. In the other direction, if a goal is stated as "lose 20 pounds," that is 20 × 0.45359237 = 9.07 kg, so the metric equivalent of a 20-pound goal is just over 9 kilograms.

Keep in mind that home scales and gym scales are calibrated to different tolerances, so a small residual difference between a metric and an imperial reading is usually the scale, not the conversion. Use this calculator for the math and trust the exact factor of 2.20462.

Sources: NIST Letter Circular 1033 (the 1959 yard-and-pound agreement).

Where these conversion factors come from

The relationship between kilograms and pounds is fixed by international agreement rather than by local convention. The values used on this page follow the NIST guide to the SI (US Department of Commerce) and the BIPM SI Brochure, the two documents that define the exact values used worldwide.

Because these factors are exact by definition rather than measured, converting a number and converting it back always returns the number you started with, there is no rounding drift to worry about.