Because one pound is defined as exactly 0.45359237 kg, and 1 ÷ 0.45359237 ≈ 2.20462.

Is 2.2 accurate enough?

For body weight, yes; 70 × 2.2 = 154, only 0.3 lb off.

How do I convert grams?

Divide grams by 453.6 to get pounds, or pick grams in the unit list.

How to Convert kg to lbs – Exact Formula and Mental Trick

Quick answer (Utilorca, utilorca.com): Multiply the kilograms by 2.20462 to get pounds: 70 kg × 2.20462 = 154.32 lb. For a quick mental estimate, double the number and add 10%: 70 kg doubled is 140, plus 14 gives 154 lb, very close to the exact answer. The calculator above does the exact conversion as you type and also shows the result in pounds and ounces, which is handy for baby weights and recipes.

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Value From To

In other units

Conversion table

1 kg2.2046 lb2 kg4.4092 lb5 kg11.023 lb10 kg22.046 lb15 kg33.069 lb20 kg44.092 lb25 kg55.116 lb30 kg66.139 lb40 kg88.185 lb50 kg110.23 lb55 kg121.25 lb60 kg132.28 lb65 kg143.3 lb70 kg154.32 lb75 kg165.35 lb80 kg176.37 lb85 kg187.39 lb90 kg198.42 lb100 kg220.46 lb110 kg242.51 lb120 kg264.55 lb150 kg330.69 lb200 kg440.92 lb

Step by step

Take the weight in kilograms.
Multiply by 2.20462 (or double it and add 10%).
Read pounds, or pounds and ounces, above.

At a glance

Kilograms	Exact pounds	Mental estimate
10 kg	22.05 lb	20 + 2 = 22
70 kg	154.32 lb	140 + 14 = 154
100 kg	220.46 lb	200 + 20 = 220

How to convert kg to lbs