Mass and Weight · Unit Converter

Convert Carat (metric) to Dekagram

Convert carats (metric) to dekagrams instantly. 1 carat (metric) = 0.02 dekagram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Dekagram to Carat (metric) converter for the reverse conversion.

Written by Sunith Babu L, Ph.D., Lead Engineer Reviewed by Dr. Ashok Kumar K, Ph.D.

Mass and Weight category 2 min read Published June 10, 2026 Last reviewed June 10, 2026 Updated June 10, 2026

Units explained

Troy & Apothecary

Carat (metric)

What is a carat (metric)?

The metric carat (ct) equals exactly 200 milligrams (0.0002 kg).

Origin of the carat (metric)

From Arabic 'qirat' and Greek 'keration', the carob seed once used as a counterweight.

Where it is used

The worldwide standard for gemstone and diamond mass.

When and where it was developed

The metric carat was fixed at 200 mg internationally in 1907.

Metric / SI

Dekagram

What is a dekagram?

A dekagram (dag) equals 0.01 kilogram, or 10 grams.

Origin of the dekagram

From the SI prefix 'deka-' (from Greek 'deka', ten).

Where it is used

Widely used in Central and Eastern European cooking and shops (dag/dkg).

When and where it was developed

Part of the original metric system introduced in 1795.

Carat (metric) to Dekagram conversion formula

The relationship between carats (metric) and dekagrams:

1 ct = 0.02 dag

1 dag = 50 ct

To convert carats (metric) to dekagrams, multiply the value in carats (metric) by 0.02. To reverse, multiply dekagrams by 50.

How to use this converter

Type a value into the calculator. The result in dekagrams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Dekagram to Carat (metric) converter for the reverse direction.

Step-by-step: convert carats (metric) to dekagrams

Write down the value in carats (metric) (ct).
Multiply that value by the factor 0.02.
The product is the equivalent value in dekagrams (dag).
To reverse, multiply the dekagram value by 50.

Worked examples

Example 1 — Convert 1 ct to dag:
1 × 0.02 = 0.02 dag

Example 2 — Convert 100 ct to dag:
100 × 0.02 = 2 dag

Real-world example — Plastic film and laminate thickness

A 500-carat (metric) sheet is a typical spec for ID-card laminates and film overlays. Converting to dekagrams aligns the value with the unit most CAD systems and material datasheets prefer.

500 ct × 0.02 = 10 dag

Real-world example — Packaging gauge

A 4-carat (metric) plastic bag thickness is a common spec for grocery and freezer bags. Converting from carats (metric) to dekagrams is what packaging buyers do whenever they bridge US and metric supplier quotes.

4 ct × 0.02 = 0.08 dag

Carat (metric) to Dekagram conversion table

Standard reference values for converting carats (metric) to dekagrams:

Carat (metric) [ct]	Dekagram [dag]
0.01	0.0002
0.1	0.002
1	0.02
2	0.04
3	0.06
4	0.08
5	0.1
10	0.2
20	0.4
30	0.6
40	0.8
50	1
100	2
500	10
1000	20

Frequently asked questions

How many dekagrams is 1 carat (metric)?

1 carat (metric) equals 0.02 dekagram.

How do I convert carats (metric) to dekagrams?

Multiply the value in carats (metric) by 0.02 to get dekagrams.

How do I convert dekagrams back to carats (metric)?

Multiply the value in dekagrams by 50, or use the Dekagram to Carat (metric) converter.

How many dekagrams is 100 carats (metric)?

100 carats (metric) equals 2 dekagrams, because 100 × 0.02 = 2.

Convert Carat (metric) to other weight units

Show all Carat (metric) conversions

Metric / SI (18 units)

Avoirdupois (15 units)

Troy & Apothecary (9 units)

Carat (metric) to Point (1/100 carat) (pt) Carat (metric) to Scruple (apothecary) (s ap) Carat (metric) to Pennyweight (dwt) Carat (metric) to Momme (mom) Carat (metric) to Mace (mace) Carat (metric) to Dram (apothecary/troy) (dr ap) Carat (metric) to Troy Ounce (oz t) Carat (metric) to Tael (tael) Carat (metric) to Pound (troy/apothecary) (lb t)

Indian / South Asian (6 units)

Carat (metric) to Ratti (ratti) Carat (metric) to Masha (masha) Carat (metric) to Tola (tola) Carat (metric) to Chittack (Chatank) (chittack) Carat (metric) to Seer (Ser) (seer) Carat (metric) to Maund (Mann) (maund)

Scientific / Atomic (9 units)

Carat (metric) to Electron Mass (rest) (me) Carat (metric) to MeV/c2 (MeV/c²) Carat (metric) to Muon Mass (mµ) Carat (metric) to Atomic Mass Unit (u) Carat (metric) to Proton Mass (mp) Carat (metric) to Neutron Mass (mn) Carat (metric) to Deuteron Mass (md) Carat (metric) to Carbon-12 Atom Mass (C-12) Carat (metric) to Planck Mass (mP)

Astronomical (4 units)

Carat (metric) to Lunar Mass (Moon) (M☾) Carat (metric) to Earth's Mass (M⊕) Carat (metric) to Jupiter Mass (MJ) Carat (metric) to Sun's Mass (M☉)

Biblical / Ancient (14 units)

Carat (metric) to Lepton (Biblical Roman) (lepton) Carat (metric) to Quadrans (Biblical Roman) (quadrans) Carat (metric) to Assarion (Biblical Roman) (assarion) Carat (metric) to Gerah (Biblical Hebrew) (gerah) Carat (metric) to Drachma (Biblical Greek) (drachma) Carat (metric) to Denarius (Biblical Roman) (denarius) Carat (metric) to Bekan (Biblical Hebrew) (bekah) Carat (metric) to Didrachma (Biblical Greek) (didrachma) Carat (metric) to Shekel (Biblical Hebrew) (shekel) Carat (metric) to Tetradrachma (Biblical Greek) (tetra) Carat (metric) to Mina (Biblical Greek) (mina) Carat (metric) to Mina (Biblical Hebrew) (mina) Carat (metric) to Talent (Biblical Greek) (talent) Carat (metric) to Talent (Biblical Hebrew) (talent)

Force / Engineering (5 units)

Carat (metric) to Poundal (pdl) Carat (metric) to Ton (assay) (US) (AT) Carat (metric) to Ton (assay) (UK) (AT) Carat (metric) to Kilogram-force square second/meter (hyl) Carat (metric) to Slug (slug)

Sources & references

Conversion factor (1 ct = 0.02 dag) 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.

Results are provided for general reference. Verify critical measurements against an authoritative standard.