How many kg is 150 lbs?

150 lbs is about 68.0 kg, a typical adult body weight you'll often see on metric medical forms.

Is 1 lb exactly 0.45 kg?

Close — the exact value is 0.45359237 kg. The half-kilogram approximation is fine for rough estimates only.

Switch pounds into kilograms for filling in metric forms, calculating gym plate loads, or converting US recipes and grocery weights.

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From

1 lb = 0.45359 kg

kilograms = pounds × 0.453592

How many kg is 150 lbs?: 150 lbs is about 68.0 kg, a typical adult body weight you'll often see on metric medical forms.
Is 1 lb exactly 0.45 kg?: Close — the exact value is 0.45359237 kg. The half-kilogram approximation is fine for rough estimates only.