Mass and Weight · Unit Converter

Convert Femtogram to Ratti

Convert femtograms to rattis instantly. 1 femtogram = 8.230453e-15 ratti — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ratti 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 Last reviewed Updated

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.

Indian / South Asian

Ratti

What is a ratti?

The ratti equals about 0.1215 gram, the smallest traditional South Asian weight.

Origin of the ratti

Based on the seed of the Gunja plant (Abrus precatorius), or 'raktika' in Sanskrit.

Where it is used

Gemstones and gold in Indian and South Asian jewelry.

When and where it was developed

One of the oldest weight units of the Indian subcontinent, later standardized.

Femtogram to Ratti 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 femtograms and rattis:

1 fg = 8.230453e-15 ratti
1 ratti = 1.215e+14 fg

To convert femtograms to rattis, multiply the value in femtograms by 8.230453e-15. To reverse, multiply rattis by 1.215e+14.

How to use this converter

Type a value into the calculator. The result in rattis updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ratti to Femtogram converter for the reverse direction.

Step-by-step: convert femtograms to rattis

  1. Write down the value in femtograms (fg).
  2. Multiply that value by the factor 8.230453e-15.
  3. The product is the equivalent value in rattis (ratti).
  4. To reverse, multiply the ratti value by 1.215e+14.

Worked examples

Example 1 — Convert 1 fg to ratti:
1 × 8.230453e-15 = 8.230453e-15 ratti

Example 2 — Convert 100 fg to ratti:
100 × 8.230453e-15 = 8.230453e-13 ratti

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

Crossing from femtograms to rattis is the everyday workflow of microscopy and semiconductor engineering — a measurement of 1000 femtograms translates to a much more compact value in rattis that fits the scale of biological cells and process nodes.

1000 fg × 8.230453e-15 = 8.230453e-12 ratti

Real-world example — Sub-visible-light wavelength

500 femtograms (the green-yellow visible band) equals 0.5 rattis — the canonical conversion in optics between wavelength specifications and micron-scale lens-coating thicknesses.

500 fg × 8.230453e-15 = 4.115226e-12 ratti

Femtogram to Ratti conversion table

Standard reference values for converting femtograms to rattis:

Femtogram [fg]Ratti [ratti]
0.018.230453e-17
0.18.230453e-16
18.230453e-15
21.646091e-14
32.469136e-14
43.292181e-14
54.115226e-14
108.230453e-14
201.646091e-13
302.469136e-13
403.292181e-13
504.115226e-13
1008.230453e-13
5004.115226e-12
10008.230453e-12

Frequently asked questions

How many rattis is 1 femtogram?
1 femtogram equals 8.230453e-15 ratti.
How do I convert femtograms to rattis?
Multiply the value in femtograms by 8.230453e-15 to get rattis.
How do I convert rattis back to femtograms?
Multiply the value in rattis by 1.215e+14, or use the Ratti to Femtogram converter.
How many rattis is 100 femtograms?
100 femtograms equals 8.230453e-13 rattis, because 100 × 8.230453e-15 = 8.230453e-13.

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 = 8.230453e-15 ratti) verified against the following authoritative sources:

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