Convert Pound (troy/apothecary) to Kilogram
Convert pounds (troy/apothecary) to kilograms instantly. 1 pound (troy/apothecary) = 0.3732417216 kilogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kilogram 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Historical pricing of precious metals; now largely superseded by the troy ounce.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.
Kilogram
The kilogram (kg) is the SI base unit of mass, defined by fixing the Planck constant h at 6.62607015E-34 J s.
From Greek 'khilioi' (thousand) plus 'gramma' (small weight).
The worldwide base unit of mass in science, commerce, and everyday life.
Adopted in 1795; redefined through the Planck constant on 20 May 2019.
Pound (troy/apothecary) to Kilogram conversion formula
The relationship between pounds (troy/apothecary) and kilograms:
To convert pounds (troy/apothecary) to kilograms, multiply the value in pounds (troy/apothecary) by 0.3732417216. To reverse, multiply kilograms by 2.6792288807.
How to use this converter
Type a value into the calculator. The result in kilograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kilogram to Pound (troy/apothecary) converter for the reverse direction.
Step-by-step: convert pounds (troy/apothecary) to kilograms
- Write down the value in pounds (troy/apothecary) (lb t).
- Multiply that value by the factor 0.3732417216.
- The product is the equivalent value in kilograms (kg).
- To reverse, multiply the kilogram value by 2.6792288807.
Worked examples
Example 1 — Convert 1 lb t to kg:
1 × 0.3732417216 = 0.3732417216 kg
Example 2 — Convert 100 lb t to kg:
100 × 0.3732417216 = 37.32417216 kg
Real-world example — Maritime depth conversion
A 10-pound (troy/apothecary) sounding depth converts cleanly into kilograms. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 lb t × 0.3732417216 = 3.732417216 kg
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 lb t × 0.3732417216 = 0.3732417216 kg
Real-world example — Adult height conversion
A 1.8-pound (troy/apothecary)-tall person measures a value in kilograms that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 lb t × 0.3732417216 = 0.6718350989 kg
Pound (troy/apothecary) to Kilogram conversion table
Standard reference values for converting pounds (troy/apothecary) to kilograms:
| Pound (troy/apothecary) [lb t] | Kilogram [kg] |
|---|---|
| 0.01 | 0.0037324172 |
| 0.1 | 0.0373241722 |
| 1 | 0.3732417216 |
| 2 | 0.7464834432 |
| 3 | 1.1197251648 |
| 4 | 1.4929668864 |
| 5 | 1.866208608 |
| 10 | 3.732417216 |
| 20 | 7.464834432 |
| 30 | 11.197251648 |
| 40 | 14.929668864 |
| 50 | 18.66208608 |
| 100 | 37.32417216 |
| 500 | 186.6208608 |
| 1000 | 373.2417216 |
Frequently asked questions
How many kilograms is 1 pound (troy/apothecary)?
How do I convert pounds (troy/apothecary) to kilograms?
How do I convert kilograms back to pounds (troy/apothecary)?
How many kilograms 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 = 0.3732417216 kg) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.