Use pounds and ounces to combine two mass fields. Use pounds to stone for a scalar pound/stone conversion in either direction.
| Pounds and ounces | Pounds to stone | |
|---|---|---|
| Inputs | Nonnegative pounds plus additional ounces | Nonnegative amount and direction |
| Factor | 16 oz per avoirdupois lb | 14 lb per stone |
| Default | 3 lb and 8 oz | 168 lb to stone |
| Primary result | 56 oz | 12 st |
| Details | Total oz/lb, kg/g and normalized lb+oz | Factor, source amount and reverse rate |
The mixed form computes 3 × 16 + 8 = 56 oz, or 3.5 lb. Its normalized row carries complete groups of 16 ounces into pounds. The stone form divides pounds by 14 or multiplies stone by 14, displaying up to 6 decimal places.
Decimal stone is not mixed notation
161 lb ÷ 14 = 11.5 st. This means 11 st plus 0.5 × 14 = 7 lb, so the mixed reading is 11 st 7 lb. The stone form does not display that mixed line; it must be derived separately.
Limits
These are unit conversions of mass. They do not interpret a body weight, fitness requirement or official eligibility. The stated factors are exact, but displayed and copied decimals can round; preserve the original measurement when comparing labels.
Sources
NIST SP 811, unit definitions and Appendix B factors. The paired calculator controls and rounding described above are their current form behavior. NIST Handbook 44, Appendix C, customary unit relationships.