Mass and Weight · Unit Converter

Convert Carat (metric) to Seer (Ser)

Convert carats (metric) to seers (ser) instantly. 1 carat (metric) = 0.0002143383 seer (ser) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Seer (Ser) 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 Last reviewed Updated

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.

Indian / South Asian

Seer (Ser)

What is a seer (ser)?

The seer (ser) equals about 933 grams, or eighty tola (close to one kilogram).

Origin of the seer (ser)

From Hindi/Urdu 'ser', a major pre-metric trade weight.

Where it is used

Historical grain, milk, and produce trade across South Asia.

When and where it was developed

Standardized in British India; aligned near 1 kg after metrication.

Carat (metric) to Seer (Ser) conversion formula

Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.

The relationship between carats (metric) and seers (ser):

1 ct = 0.0002143383 seer
1 seer = 4665.5215 ct

To convert carats (metric) to seers (ser), multiply the value in carats (metric) by 0.0002143383. To reverse, multiply seers (ser) by 4665.5215.

How to use this converter

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

Step-by-step: convert carats (metric) to seers (ser)

  1. Write down the value in carats (metric) (ct).
  2. Multiply that value by the factor 0.0002143383.
  3. The product is the equivalent value in seers (ser) (seer).
  4. To reverse, multiply the seer (ser) value by 4665.5215.

Worked examples

Example 1 — Convert 1 ct to seer:
1 × 0.0002143383 = 0.0002143383 seer

Example 2 — Convert 100 ct to seer:
100 × 0.0002143383 = 0.0214338311 seer

Real-world example — Macro-scale buildup

A million carats (metric) equals exactly one seer (ser) — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.

1000000 ct × 0.0002143383 = 214.3383113763 seer

Real-world example — Quarter-meter measurement reference

A 250,000-carat (metric) length equals 0.25 seers (ser) — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.

250000 ct × 0.0002143383 = 53.5845778441 seer

Real-world example — From microscopic to macroscopic

A million carats (metric) equals exactly one seer (ser). This kind of conversion appears in microfluidics, where total channel length is given in seers (ser) but feature widths are in carats (metric).

1000000 ct × 0.0002143383 = 214.3383113763 seer

Carat (metric) to Seer (Ser) conversion table

Standard reference values for converting carats (metric) to seers (ser):

Carat (metric) [ct]Seer (Ser) [seer]
0.012.143383e-6
0.12.143383e-5
10.0002143383
20.0004286766
30.0006430149
40.0008573532
50.0010716916
100.0021433831
200.0042867662
300.0064301493
400.0085735325
500.0107169156
1000.0214338311
5000.1071691557
10000.2143383114

Frequently asked questions

How many seers (ser) is 1 carat (metric)?
1 carat (metric) equals 0.0002143383 seer (ser).
How do I convert carats (metric) to seers (ser)?
Multiply the value in carats (metric) by 0.0002143383 to get seers (ser).
How do I convert seers (ser) back to carats (metric)?
Multiply the value in seers (ser) by 4665.5215, or use the Seer (Ser) to Carat (metric) converter.
How many seers (ser) is 100 carats (metric)?
100 carats (metric) equals 0.0214338311 seers (ser), because 100 × 0.0002143383 = 0.0214338311.

Convert Carat (metric) to other weight units

Show all Carat (metric) conversions
Metric / SI (18 units)
Carat (metric) to Attogram (ag) Carat (metric) to Femtogram (fg) Carat (metric) to Picogram (pg) Carat (metric) to Nanogram (ng) Carat (metric) to Microgram (µg) Carat (metric) to Milligram (mg) Carat (metric) to Centigram (cg) Carat (metric) to Decigram (dg) Carat (metric) to Gram (g) Carat (metric) to Dekagram (dag) Carat (metric) to Hectogram (hg) Carat (metric) to Kilogram (kg) Carat (metric) to Quintal (metric) (q) Carat (metric) to Metric Ton (t) Carat (metric) to Gigagram (Gg) Carat (metric) to Teragram (Tg) Carat (metric) to Petagram (Pg) Carat (metric) to Exagram (Eg)
Avoirdupois (15 units)
Carat (metric) to Grain (gr) Carat (metric) to Dram (avoirdupois) (dr) Carat (metric) to Ounce (oz) Carat (metric) to Pound (lb) Carat (metric) to Clove (clove) Carat (metric) to Stone (US) (st) Carat (metric) to Stone (UK) (st) Carat (metric) to Quarter (US) (qr) Carat (metric) to Quarter (UK) (qr) Carat (metric) to Hundredweight (US) (cwt) Carat (metric) to Hundredweight (UK) (cwt) Carat (metric) to Wey (wey) Carat (metric) to Kilopound (kip) (kip) Carat (metric) to Ton (short, US) (sh tn) Carat (metric) to Ton (long, UK) (long tn)
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 = 0.0002143383 seer) verified against the following authoritative sources:

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