To convert pounds to kilograms, you can use the conversion factor that 1 kilogram is approximately 2.2 pounds. To find out how many kilograms are in 125 pounds, use the following calculation:
\[ \text{kilograms} = \frac{\text{pounds}}{2.2} \]
Substituting 125 pounds into the equation:
\[ \text{kilograms} = \frac{125}{2.2} \approx 56.8181 \]
Rounding this to the nearest tenth:
\[ \text{kilograms} \approx 56.8 \]
Thus, there are approximately 56.8 kilograms in 125 pounds.