How to convert stones to lbs or lbs to stones?. Lb = stone x 14 Conversion Example Next, let's look at an example showing the work and calculations that are involved in converting from stones to pounds (st to lb). Stone to Pound Conversion Example Task: Convert 10 stones to pounds (show work) Formula: stones x 14 = lb Calculations: 10 stones x 14 = 140 lb Result: 10 stones is equal to 140 lb.