Carat to Scruple Converter

Mass Converter

26 units available

Decimals:

From

To

0.154324

1 ct = 0.154324 scr

Formula:

scr = ct × 0.1543235835

With your value: 1 ct = 0.15432358 scr

How big is that?

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

Your value1.00 ct

Paperclip (5.0× your value)5.00 ct

AA battery (1.2e+2× your value)120 ct

Can of soda (2.0e+3× your value)1.95e+3 ct

Bag of sugar (5.0e+3× your value)5.00e+3 ct

House cat (2.3e+4× your value)2.25e+4 ct

Other Carat to Scruple conversions

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

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

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

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.

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

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

How to Convert Carat to Scruple

To convert from Carat (ct) to Scruple (scr), multiply the value by 0.1543235835.

Formula: scr = ct × 0.1543235835

Reverse: ct = scr × 6.479891

Step-by-Step Example

Start with your value in Carat. For example: 5 ct
Multiply by the conversion factor: 5 x 0.1543235835
The result is: 0.771618 scr

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.

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.

Frequently Asked Questions

How many Scruple are in 1 Carat?

There are exactly 0.1543235835 Scruple in 1 Carat. This means the conversion factor from Carat to Scruple is 0.1543235835.

What is the formula to convert Carat to Scruple?

The formula to convert Carat to Scruple is: scr = ct × 0.1543235835. For example, to convert 10 Carat to Scruple, you would multiply 10 by 0.1543235835.

What is a Carat?