Mass and Weight · Unit Converter

Convert Seer (Ser) to Attogram

Convert seers (ser) to attograms instantly. 1 seer (ser) = 9.331043e+20 attogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attogram to Seer (Ser) 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

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.

Metric / SI

Attogram

What is a attogram?

An attogram (ag) equals 10^-21 kilogram.

Origin of the attogram

From the SI prefix 'atto-' (from Danish 'atten', eighteen).

Where it is used

Frontier nanoscience and single-molecule mass detection.

When and where it was developed

The atto- prefix was adopted by the CGPM in 1975.

Seer (Ser) to Attogram 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 seers (ser) and attograms:

1 seer = 9.331043e+20 ag

1 ag = 1.071692e-21 seer

To convert seers (ser) to attograms, multiply the value in seers (ser) by 9.331043e+20. To reverse, multiply attograms by 1.071692e-21.

How to use this converter

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

Step-by-step: convert seers (ser) to attograms

Write down the value in seers (ser) (seer).
Multiply that value by the factor 9.331043e+20.
The product is the equivalent value in attograms (ag).
To reverse, multiply the attogram value by 1.071692e-21.

Worked examples

Example 1 — Convert 1 seer to ag:
1 × 9.331043e+20 = 9.331043e+20 ag

Example 2 — Convert 100 seer to ag:
100 × 9.331043e+20 = 9.331043e+22 ag

Real-world example — Meter to nanoscale

One seer (ser) equals one billion attograms. Physics curricula use this conversion to teach orders of magnitude when introducing the electromagnetic spectrum.

1 seer × 9.331043e+20 = 9.331043e+20 ag

Real-world example — Human-scale to atomic dimensions

One seer (ser) equals one billion attograms — the canonical metric conversion bridging everyday objects and atomic-scale features in physics, chemistry, and electronics.

1 seer × 9.331043e+20 = 9.331043e+20 ag

Seer (Ser) to Attogram conversion table

Standard reference values for converting seers (ser) to attograms:

Seer (Ser) [seer]	Attogram [ag]
0.01	9.331043e+18
0.1	9.331043e+19
1	9.331043e+20
2	1.866209e+21
3	2.799313e+21
4	3.732417e+21
5	4.665522e+21
10	9.331043e+21
20	1.866209e+22
30	2.799313e+22
40	3.732417e+22
50	4.665522e+22
100	9.331043e+22
500	4.665522e+23
1000	9.331043e+23

Frequently asked questions

How many attograms is 1 seer (ser)?

1 seer (ser) equals 9.331043e+20 attogram.

How do I convert seers (ser) to attograms?

Multiply the value in seers (ser) by 9.331043e+20 to get attograms.

How do I convert attograms back to seers (ser)?

Multiply the value in attograms by 1.071692e-21, or use the Attogram to Seer (Ser) converter.

How many attograms is 100 seers (ser)?

100 seers (ser) equals 9.331043e+22 attograms, because 100 × 9.331043e+20 = 9.331043e+22.

Convert Seer (Ser) to other weight units

Show all Seer (Ser) conversions

Metric / SI (18 units)

Seer (Ser) to Attogram (ag) Seer (Ser) to Femtogram (fg) Seer (Ser) to Picogram (pg) Seer (Ser) to Nanogram (ng) Seer (Ser) to Microgram (µg) Seer (Ser) to Milligram (mg) Seer (Ser) to Centigram (cg) Seer (Ser) to Decigram (dg) Seer (Ser) to Gram (g) Seer (Ser) to Dekagram (dag) Seer (Ser) to Hectogram (hg) Seer (Ser) to Kilogram (kg) Seer (Ser) to Quintal (metric) (q) Seer (Ser) to Metric Ton (t) Seer (Ser) to Gigagram (Gg) Seer (Ser) to Teragram (Tg) Seer (Ser) to Petagram (Pg) Seer (Ser) to Exagram (Eg)

Avoirdupois (15 units)

Seer (Ser) to Grain (gr) Seer (Ser) to Dram (avoirdupois) (dr) Seer (Ser) to Ounce (oz) Seer (Ser) to Pound (lb) Seer (Ser) to Clove (clove) Seer (Ser) to Stone (US) (st) Seer (Ser) to Stone (UK) (st) Seer (Ser) to Quarter (US) (qr) Seer (Ser) to Quarter (UK) (qr) Seer (Ser) to Hundredweight (US) (cwt) Seer (Ser) to Hundredweight (UK) (cwt) Seer (Ser) to Wey (wey) Seer (Ser) to Kilopound (kip) (kip) Seer (Ser) to Ton (short, US) (sh tn) Seer (Ser) to Ton (long, UK) (long tn)

Troy & Apothecary (10 units)

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

Indian / South Asian (5 units)

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

Scientific / Atomic (9 units)

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

Astronomical (4 units)

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

Biblical / Ancient (14 units)

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

Force / Engineering (5 units)

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

Sources & references

Conversion factor (1 seer = 9.331043e+20 ag) 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.