Mass and Weight · Unit Converter

Convert Carat (metric) to Picogram

Convert carats (metric) to picograms instantly. 1 carat (metric) = 2e+11 picogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Picogram 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

Picogram

What is a picogram?

A picogram (pg) equals 10^-15 kilogram.

Origin of the picogram

From the SI prefix 'pico-' (from Spanish 'pico', a small quantity).

Where it is used

Single-cell biology and ultratrace chemical analysis.

When and where it was developed

The pico- prefix entered the SI in 1960.

Carat (metric) to Picogram conversion formula

The relationship between carats (metric) and picograms:

1 ct = 2e+11 pg

1 pg = 5e-12 ct

To convert carats (metric) to picograms, multiply the value in carats (metric) by 2e+11. To reverse, multiply picograms by 5e-12.

How to use this converter

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

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

Write down the value in carats (metric) (ct).
Multiply that value by the factor 2e+11.
The product is the equivalent value in picograms (pg).
To reverse, multiply the picogram value by 5e-12.

Worked examples

Example 1 — Convert 1 ct to pg:
1 × 2e+11 = 2e+11 pg

Example 2 — Convert 100 ct to pg:
100 × 2e+11 = 2e+13 pg

Real-world example — From microns to sub-micron features

One carat (metric) equals one thousand picograms — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.

1 ct × 2e+11 = 2e+11 pg

Real-world example — Infrared to visible-spectrum mapping

A 10-carat (metric) thermal infrared wavelength corresponds to a much larger number in picograms, the unit favoured for ultraviolet and visible-light specifications.

10 ct × 2e+11 = 2e+12 pg

Real-world example — Mid-micron to nanometer

3 carats (metric) equals 3,000 picograms — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.

3 ct × 2e+11 = 6e+11 pg

Carat (metric) to Picogram conversion table

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

Carat (metric) [ct]	Picogram [pg]
0.01	2e+9
0.1	2e+10
1	2e+11
2	4e+11
3	6e+11
4	8e+11
5	1e+12
10	2e+12
20	4e+12
30	6e+12
40	8e+12
50	1e+13
100	2e+13
500	1e+14
1000	2e+14

Frequently asked questions

How many picograms is 1 carat (metric)?

1 carat (metric) equals 2e+11 picogram.

How do I convert carats (metric) to picograms?

Multiply the value in carats (metric) by 2e+11 to get picograms.

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

Multiply the value in picograms by 5e-12, or use the Picogram to Carat (metric) converter.

How many picograms is 100 carats (metric)?

100 carats (metric) equals 2e+13 picograms, because 100 × 2e+11 = 2e+13.

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 = 2e+11 pg) 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.

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