Convert Carat (metric) to Pound
Convert carats (metric) to pounds instantly. 1 carat (metric) = 0.0004409245 pound — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pound to Carat (metric) converter for the reverse conversion.
Units explained
Carat (metric)
The metric carat (ct) equals exactly 200 milligrams (0.0002 kg).
From Arabic 'qirat' and Greek 'keration', the carob seed once used as a counterweight.
The worldwide standard for gemstone and diamond mass.
The metric carat was fixed at 200 mg internationally in 1907.
Pound
The pound (lb) is a unit of mass equal to exactly 0.45359237 kilogram.
From Latin 'libra pondo' (a pound by weight); the symbol lb comes from 'libra'.
The primary weight unit in the United States and informally in the UK.
The international avoirdupois pound was fixed in the 1959 yard-and-pound agreement.
Carat (metric) to Pound conversion formula
The relationship between carats (metric) and pounds:
To convert carats (metric) to pounds, multiply the value in carats (metric) by 0.0004409245. To reverse, multiply pounds by 2267.96185.
How to use this converter
Type a value into the calculator. The result in pounds updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Pound to Carat (metric) converter for the reverse direction.
Step-by-step: convert carats (metric) to pounds
- Write down the value in carats (metric) (ct).
- Multiply that value by the factor 0.0004409245.
- The product is the equivalent value in pounds (lb).
- To reverse, multiply the pound value by 2267.96185.
Worked examples
Example 1 — Convert 1 ct to lb:
1 × 0.0004409245 = 0.0004409245 lb
Example 2 — Convert 100 ct to lb:
100 × 0.0004409245 = 0.0440924524 lb
Real-world example — Quarter-meter measurement reference
A 250,000-carat (metric) length equals 0.25 pounds — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 ct × 0.0004409245 = 110.2311310924 lb
Real-world example — From microscopic to macroscopic
A million carats (metric) equals exactly one pound. This kind of conversion appears in microfluidics, where total channel length is given in pounds but feature widths are in carats (metric).
1000000 ct × 0.0004409245 = 440.9245243698 lb
Real-world example — Macro-scale buildup
A million carats (metric) equals exactly one pound — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 ct × 0.0004409245 = 440.9245243698 lb
Carat (metric) to Pound conversion table
Standard reference values for converting carats (metric) to pounds:
| Carat (metric) [ct] | Pound [lb] |
|---|---|
| 0.01 | 4.409245e-6 |
| 0.1 | 4.409245e-5 |
| 1 | 0.0004409245 |
| 2 | 0.000881849 |
| 3 | 0.0013227736 |
| 4 | 0.0017636981 |
| 5 | 0.0022046226 |
| 10 | 0.0044092452 |
| 20 | 0.0088184905 |
| 30 | 0.0132277357 |
| 40 | 0.017636981 |
| 50 | 0.0220462262 |
| 100 | 0.0440924524 |
| 500 | 0.2204622622 |
| 1000 | 0.4409245244 |
Frequently asked questions
How many pounds is 1 carat (metric)?
How do I convert carats (metric) to pounds?
How do I convert pounds back to carats (metric)?
How many pounds is 100 carats (metric)?
Popular weight unit conversions
Convert Carat (metric) to other weight units
Show all Carat (metric) 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 ct = 0.0004409245 lb) 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.