* Stone to pounds: 10 stone * 14 lbs/stone = 140 lbs

* Total pounds: 140 lbs + 10 lbs = 150 lbs

* Pounds to kilograms: 150 lbs * 0.453592 kg/lb = 68.0389 kg

Therefore, 10 stone 10 lbs is approximately 68.04 kilograms.