Convert Carat (metric) to Quarter (US)
Convert carats (metric) to quarters (us) instantly. 1 carat (metric) = 1.763698e-5 quarter (us) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Quarter (US) 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.
Quarter (US)
The US quarter equals one-fourth of a short hundredweight, 25 pounds (about 11.34 kg).
A 'quarter' of the US short hundredweight.
US agricultural and commodity weighing.
Defined within the US customary hundredweight system.
Carat (metric) to Quarter (US) conversion formula
The relationship between carats (metric) and quarters (us):
To convert carats (metric) to quarters (us), multiply the value in carats (metric) by 1.763698e-5. To reverse, multiply quarters (us) by 56699.04625.
How to use this converter
Type a value into the calculator. The result in quarters (us) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Quarter (US) to Carat (metric) converter for the reverse direction.
Step-by-step: convert carats (metric) to quarters (us)
- Write down the value in carats (metric) (ct).
- Multiply that value by the factor 1.763698e-5.
- The product is the equivalent value in quarters (us) (qr).
- To reverse, multiply the quarter (us) value by 56699.04625.
Worked examples
Example 1 — Convert 1 ct to qr:
1 × 1.763698e-5 = 1.763698e-5 qr
Example 2 — Convert 100 ct to qr:
100 × 1.763698e-5 = 0.0017636981 qr
Real-world example — Hair-width scale measurements
A 70-carat (metric) measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like quarters (us) for direct comparison across supplier datasheets.
70 ct × 1.763698e-5 = 0.0012345887 qr
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 carats (metric)), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 ct × 1.763698e-5 = 5.291094e-5 qr
Real-world example — Plastic-film thickness alternates
A 150-carat (metric) plastic film converts cleanly to quarters (us) — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 ct × 1.763698e-5 = 0.0026455471 qr
Carat (metric) to Quarter (US) conversion table
Standard reference values for converting carats (metric) to quarters (us):
| Carat (metric) [ct] | Quarter (US) [qr] |
|---|---|
| 0.01 | 1.763698e-7 |
| 0.1 | 1.763698e-6 |
| 1 | 1.763698e-5 |
| 2 | 3.527396e-5 |
| 3 | 5.291094e-5 |
| 4 | 7.054792e-5 |
| 5 | 8.81849e-5 |
| 10 | 0.0001763698 |
| 20 | 0.0003527396 |
| 30 | 0.0005291094 |
| 40 | 0.0007054792 |
| 50 | 0.000881849 |
| 100 | 0.0017636981 |
| 500 | 0.0088184905 |
| 1000 | 0.017636981 |
Frequently asked questions
How many quarters (us) is 1 carat (metric)?
How do I convert carats (metric) to quarters (us)?
How do I convert quarters (us) back to carats (metric)?
How many quarters (us) is 100 carats (metric)?
Popular weight unit conversions
Convert Carat (metric) to other weight units
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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 = 1.763698e-5 qr) 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.