Convert Pound (troy/apothecary) to Ounce
Convert pounds (troy/apothecary) to ounces instantly. 1 pound (troy/apothecary) = 13.1657142973 ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ounce to Pound (troy/apothecary) converter for the reverse conversion.
Units explained
Pound (troy/apothecary)
The troy (apothecary) pound equals 12 troy ounces, about 373.24 grams.
Named for Troyes, France, a major medieval trade-fair town.
Historical pricing of precious metals; now largely superseded by the troy ounce.
Adopted as the English coinage standard under Henry VIII in 1528.
Ounce
The (avoirdupois) ounce (oz) equals one-sixteenth of a pound, about 28.35 grams.
From Latin 'uncia', meaning a twelfth part.
US food portions, postal weights, and boxing weight classes.
Standardized as 1/16 of the international pound from 1959.
Pound (troy/apothecary) to Ounce conversion formula
The relationship between pounds (troy/apothecary) and ounces:
To convert pounds (troy/apothecary) to ounces, multiply the value in pounds (troy/apothecary) by 13.1657142973. To reverse, multiply ounces by 0.075954861.
How to use this converter
Type a value into the calculator. The result in ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ounce to Pound (troy/apothecary) converter for the reverse direction.
Step-by-step: convert pounds (troy/apothecary) to ounces
- Write down the value in pounds (troy/apothecary) (lb t).
- Multiply that value by the factor 13.1657142973.
- The product is the equivalent value in ounces (oz).
- To reverse, multiply the ounce value by 0.075954861.
Worked examples
Example 1 — Convert 1 lb t to oz:
1 × 13.1657142973 = 13.1657142973 oz
Example 2 — Convert 100 lb t to oz:
100 × 13.1657142973 = 1316.5714297324 oz
Real-world example — Body height conversion (reverse direction)
You measure 1.75 pounds (troy/apothecary) tall and need to fill in a gym membership form or medical record that asks for height in ounces. This is the most-used everyday length conversion in metric-using countries.
1.75 lb t × 13.1657142973 = 23.0400000203 oz
Real-world example — Pet and accessory dimensions
A 3-pound (troy/apothecary) dog leash equals a tidy round value in ounces. Pet-supply shopping frequently mixes the two units across product specifications.
3 lb t × 13.1657142973 = 39.497142892 oz
Real-world example — Fabric and tailoring
One pound (troy/apothecary) of fabric converts to a value in ounces commonly used for seam allowances. Garment patterns frequently switch between the two units on a single instruction sheet.
1 lb t × 13.1657142973 = 13.1657142973 oz
Pound (troy/apothecary) to Ounce conversion table
Standard reference values for converting pounds (troy/apothecary) to ounces:
| Pound (troy/apothecary) [lb t] | Ounce [oz] |
|---|---|
| 0.01 | 0.131657143 |
| 0.1 | 1.3165714297 |
| 1 | 13.1657142973 |
| 2 | 26.3314285946 |
| 3 | 39.497142892 |
| 4 | 52.6628571893 |
| 5 | 65.8285714866 |
| 10 | 131.6571429732 |
| 20 | 263.3142859465 |
| 30 | 394.9714289197 |
| 40 | 526.628571893 |
| 50 | 658.2857148662 |
| 100 | 1316.5714297324 |
| 500 | 6582.8571486622 |
| 1000 | 13165.7142973245 |
Frequently asked questions
How many ounces is 1 pound (troy/apothecary)?
How do I convert pounds (troy/apothecary) to ounces?
How do I convert ounces back to pounds (troy/apothecary)?
How many ounces is 100 pounds (troy/apothecary)?
Popular weight unit conversions
Convert Pound (troy/apothecary) to other weight units
Show all Pound (troy/apothecary) conversions
Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (9 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 lb t = 13.1657142973 oz) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.