Mass and Weight · Unit Converter

Convert Ratti to Femtogram

Convert rattis to femtograms instantly. 1 ratti = 1.215e+14 femtogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Femtogram to Ratti 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

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.

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.

Ratti to Femtogram 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 rattis and femtograms:

1 ratti = 1.215e+14 fg

1 fg = 8.230453e-15 ratti

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

How to use this converter

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

Step-by-step: convert rattis to femtograms

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

Worked examples

Example 1 — Convert 1 ratti to fg:
1 × 1.215e+14 = 1.215e+14 fg

Example 2 — Convert 100 ratti to fg:
100 × 1.215e+14 = 1.215e+16 fg

Real-world example — Infrared to visible-spectrum mapping

A 10-ratti thermal infrared wavelength corresponds to a much larger number in femtograms, the unit favoured for ultraviolet and visible-light specifications.

10 ratti × 1.215e+14 = 1.215e+15 fg

Real-world example — Mid-micron to nanometer

3 rattis equals 3,000 femtograms — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.

3 ratti × 1.215e+14 = 3.645e+14 fg

Real-world example — From microns to sub-micron features

One ratti equals one thousand femtograms — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.

1 ratti × 1.215e+14 = 1.215e+14 fg

Ratti to Femtogram conversion table

Standard reference values for converting rattis to femtograms:

Ratti [ratti]	Femtogram [fg]
0.01	1.215e+12
0.1	1.215e+13
1	1.215e+14
2	2.43e+14
3	3.645e+14
4	4.86e+14
5	6.075e+14
10	1.215e+15
20	2.43e+15
30	3.645e+15
40	4.86e+15
50	6.075e+15
100	1.215e+16
500	6.075e+16
1000	1.215e+17

Frequently asked questions

How many femtograms is 1 ratti?

1 ratti equals 1.215e+14 femtogram.

How do I convert rattis to femtograms?

Multiply the value in rattis by 1.215e+14 to get femtograms.

How do I convert femtograms back to rattis?

Multiply the value in femtograms by 8.230453e-15, or use the Femtogram to Ratti converter.

How many femtograms is 100 rattis?

100 rattis equals 1.215e+16 femtograms, because 100 × 1.215e+14 = 1.215e+16.

Convert Ratti to other weight units

Show all Ratti conversions

Metric / SI (18 units)

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

Avoirdupois (15 units)

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

Troy & Apothecary (10 units)

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

Indian / South Asian (5 units)

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

Scientific / Atomic (9 units)

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

Astronomical (4 units)

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

Biblical / Ancient (14 units)

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

Force / Engineering (5 units)

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

Sources & references

Conversion factor (1 ratti = 1.215e+14 fg) 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.