Mass and Weight · Unit Converter

Convert Femtogram to Point (1/100 carat)

Convert femtograms to points (1/100 carat) instantly. 1 femtogram = 5e-13 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 Femtogram 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

Femtogram

What is a femtogram?

A femtogram (fg) equals 10^-18 kilogram.

Origin of the femtogram

From the SI prefix 'femto-' (from Danish/Norwegian 'femten', fifteen).

Where it is used

Nanotechnology and high-sensitivity mass spectrometry.

When and where it was developed

The femto- 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.

Femtogram to Point (1/100 carat) conversion formula

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

1 fg = 5e-13 pt

1 pt = 2e+12 fg

To convert femtograms to points (1/100 carat), multiply the value in femtograms by 5e-13. To reverse, multiply points (1/100 carat) by 2e+12.

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 Femtogram converter for the reverse direction.

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

Write down the value in femtograms (fg).
Multiply that value by the factor 5e-13.
The product is the equivalent value in points (1/100 carat) (pt).
To reverse, multiply the point (1/100 carat) value by 2e+12.

Worked examples

Example 1 — Convert 1 fg to pt:
1 × 5e-13 = 5e-13 pt

Example 2 — Convert 100 fg to pt:
100 × 5e-13 = 5e-11 pt

Real-world example — Sub-visible-light wavelength

500 femtograms (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 fg × 5e-13 = 2.5e-10 pt

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

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

1000 fg × 5e-13 = 5e-10 pt

Femtogram to Point (1/100 carat) conversion table

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

Femtogram [fg]	Point (1/100 carat) [pt]
0.01	5e-15
0.1	5e-14
1	5e-13
2	1e-12
3	1.5e-12
4	2e-12
5	2.5e-12
10	5e-12
20	1e-11
30	1.5e-11
40	2e-11
50	2.5e-11
100	5e-11
500	2.5e-10
1000	5e-10

Frequently asked questions

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

1 femtogram equals 5e-13 point (1/100 carat).

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

Multiply the value in femtograms by 5e-13 to get points (1/100 carat).

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

Multiply the value in points (1/100 carat) by 2e+12, or use the Point (1/100 carat) to Femtogram converter.

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

100 femtograms equals 5e-11 points (1/100 carat), because 100 × 5e-13 = 5e-11.

Convert Femtogram to other weight units

Show all Femtogram conversions

Metric / SI (17 units)

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

Avoirdupois (15 units)

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

Troy & Apothecary (10 units)

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

Indian / South Asian (6 units)

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

Scientific / Atomic (9 units)

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

Astronomical (4 units)

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

Biblical / Ancient (14 units)

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

Force / Engineering (5 units)

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

Sources & references

Conversion factor (1 fg = 5e-13 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.