Mass and Weight · Unit Converter

Convert Attogram to Point (1/100 carat)

Convert attograms to points (1/100 carat) instantly. 1 attogram = 5e-16 point (1/100 carat) — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Point (1/100 carat) to Attogram 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

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.

Troy & Apothecary

Point (1/100 carat)

What is a point (1/100 carat)?

A point equals one-hundredth of a carat, or 2 milligrams.

Origin of the point (1/100 carat)

A subdivision of the metric carat for very small stones.

Where it is used

The diamond trade, for sub-carat stones.

When and where it was developed

Adopted alongside the metric carat in the 20th-century gem trade.

Attogram to Point (1/100 carat) conversion formula

The relationship between attograms and points (1/100 carat):

1 ag = 5e-16 pt

1 pt = 2e+15 ag

To convert attograms to points (1/100 carat), multiply the value in attograms by 5e-16. To reverse, multiply points (1/100 carat) by 2e+15.

How to use this converter

Type a value into the calculator. The result in points (1/100 carat) updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Point (1/100 carat) to Attogram converter for the reverse direction.

Step-by-step: convert attograms to points (1/100 carat)

Write down the value in attograms (ag).
Multiply that value by the factor 5e-16.
The product is the equivalent value in points (1/100 carat) (pt).
To reverse, multiply the point (1/100 carat) value by 2e+15.

Worked examples

Example 1 — Convert 1 ag to pt:
1 × 5e-16 = 5e-16 pt

Example 2 — Convert 100 ag to pt:
100 × 5e-16 = 5e-14 pt

Real-world example — Sub-visible-light wavelength

500 attograms (the green-yellow visible band) equals 0.5 points (1/100 carat) — the canonical conversion in optics between wavelength specifications and micron-scale lens-coating thicknesses.

500 ag × 5e-16 = 2.5e-13 pt

Real-world example — Spanning sub-micron to micron scale

Crossing from attograms to points (1/100 carat) is the everyday workflow of microscopy and semiconductor engineering — a measurement of 1000 attograms translates to a much more compact value in points (1/100 carat) that fits the scale of biological cells and process nodes.

1000 ag × 5e-16 = 5e-13 pt

Attogram to Point (1/100 carat) conversion table

Standard reference values for converting attograms to points (1/100 carat):

Attogram [ag]	Point (1/100 carat) [pt]
0.01	5e-18
0.1	5e-17
1	5e-16
2	1e-15
3	1.5e-15
4	2e-15
5	2.5e-15
10	5e-15
20	1e-14
30	1.5e-14
40	2e-14
50	2.5e-14
100	5e-14
500	2.5e-13
1000	5e-13

Frequently asked questions

How many points (1/100 carat) is 1 attogram?

1 attogram equals 5e-16 point (1/100 carat).

How do I convert attograms to points (1/100 carat)?

Multiply the value in attograms by 5e-16 to get points (1/100 carat).

How do I convert points (1/100 carat) back to attograms?

Multiply the value in points (1/100 carat) by 2e+15, or use the Point (1/100 carat) to Attogram converter.

How many points (1/100 carat) is 100 attograms?

100 attograms equals 5e-14 points (1/100 carat), because 100 × 5e-16 = 5e-14.

Convert Attogram to other weight units

Show all Attogram conversions

Metric / SI (17 units)

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

Avoirdupois (15 units)

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

Troy & Apothecary (10 units)

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

Indian / South Asian (6 units)

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

Scientific / Atomic (9 units)

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

Astronomical (4 units)

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

Biblical / Ancient (14 units)

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

Force / Engineering (5 units)

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

Sources & references

Conversion factor (1 ag = 5e-16 pt) 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.