Scruple to Carat Converter

Mass Converter

26 units available

Decimals:

From

To

6.479891

1 scr = 6.479891 ct

Formula:

ct = scr × 6.479891

With your value: 1 scr = 6.479891 ct

How big is that?

Everyday references on a logarithmic scale, all expressed in scruple so you can sanity-check the result.

Paperclip (1/1.3 your value)0.772 scr

Your value1.00 scr

AA battery (19× your value)18.5 scr

Can of soda (3.0e+2× your value)301 scr

Bag of sugar (7.7e+2× your value)772 scr

House cat (3.5e+3× your value)3.47e+3 scr

Other Scruple to Carat conversions

2 scr to ct 3 scr to ct 4 scr to ct 5 scr to ct 6 scr to ct 7 scr to ct 8 scr to ct

Scruple to Carat Conversion Table

Scruple (scr)	Carat (ct)
0.5	3.239945
1	6.479891
2	12.959782
5	32.399455
10	64.79891
15	97.198365
20	129.59782
25	161.997275
50	323.99455
100	647.9891
250	1,619.97275
500	3,239.9455
1000	6,479.891

Carat to Scruple Conversion Table

Carat (ct)	Scruple (scr)
0.5	0.077162
1	0.154324
2	0.308647
5	0.771618
10	1.543236
15	2.314854
20	3.086472
25	3.85809
50	7.716179
100	15.432358
250	38.580896
500	77.161792
1000	154.323584

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Scruple (scr)

Mass

Exact conversion

Traceable to the kilogram, defined by fixing the Planck constant at 6.626 070 15 × 10⁻³⁴ J·s. Avoirdupois masses derive from the 1959 international pound (0.453 592 37 kg exactly).

Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)

Bureau International des Poids et Mesures · Reviewed 2026-07-01

Carat (ct)

Mass

Conventional value

The metric carat is exactly 200 mg, agreed internationally in 1907.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Scruple to Carat

To convert from Scruple (scr) to Carat (ct), multiply the value by 6.479891.

Formula: ct = scr × 6.479891

Reverse: scr = ct × 0.1543235835

Step-by-Step Example

Start with your value in Scruple. For example: 5 scr
Multiply by the conversion factor: 5 x 6.479891
The result is: 32.399455 ct

About Scruple

The scruple (scr) is a unit of mass and weight. One scruple equals 0.0012959782 kilograms. UnitConvertLab converts it against every other mass unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: mass calculations, engineering and science, education.

About Carat

The carat equals 200 milligrams and is the standard unit for measuring gemstone weight.

Fun Fact: The word "carat" comes from the carob seed, which was used as a balance weight in ancient gem trading.

Common uses: gemstones, diamonds, jewelry.

Frequently Asked Questions

How many Carat are in 1 Scruple?

There are exactly 6.479891 Carat in 1 Scruple. This means the conversion factor from Scruple to Carat is 6.479891.

What is the formula to convert Scruple to Carat?

The formula to convert Scruple to Carat is: ct = scr × 6.479891. For example, to convert 10 Scruple to Carat, you would multiply 10 by 6.479891.

What is a Scruple?