Mass and Weight · Unit Converter

Convert Electron Mass (rest) to Femtogram

Convert electron mass (rest) to femtograms instantly. 1 electron mass (rest) = 9.10939e-13 femtogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Femtogram to Electron Mass (rest) 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

Scientific / Atomic

Electron Mass (rest)

What is a electron mass (rest)?

The electron rest mass is about 9.109E-31 kg.

Origin of the electron mass (rest)

The mass of the electron, the lightest charged elementary particle.

Where it is used

Atomic and particle physics.

When and where it was developed

Quantified after J. J. Thomson identified the electron in 1897.

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.

Electron Mass (rest) 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 electron mass (rest) and femtograms:

1 me = 9.10939e-13 fg
1 fg = 1.097768e+12 me

To convert electron mass (rest) to femtograms, multiply the value in electron mass (rest) by 9.10939e-13. To reverse, multiply femtograms by 1.097768e+12.

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 Electron Mass (rest) converter for the reverse direction.

Step-by-step: convert electron mass (rest) to femtograms

  1. Write down the value in electron mass (rest) (me).
  2. Multiply that value by the factor 9.10939e-13.
  3. The product is the equivalent value in femtograms (fg).
  4. To reverse, multiply the femtogram value by 1.097768e+12.

Worked examples

Example 1 — Convert 1 me to fg:
1 × 9.10939e-13 = 9.10939e-13 fg

Example 2 — Convert 100 me to fg:
100 × 9.10939e-13 = 9.10939e-11 fg

Real-world example — Wavelengths across the spectrum

Optical and atomic-scale phenomena are routinely cross-converted between sub-micron units. A photon of wavelength 800 electron mass (rest) can be re-expressed in femtograms for direct comparison with another instrument's calibration data sheet.

800 me × 9.10939e-13 = 7.287512e-10 fg

Real-world example — Molecular dimensions

The diameter of small molecular structures (around 2 electron mass (rest)) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.

2 me × 9.10939e-13 = 1.821878e-12 fg

Electron Mass (rest) to Femtogram conversion table

Standard reference values for converting electron mass (rest) to femtograms:

Electron Mass (rest) [me]Femtogram [fg]
0.019.10939e-15
0.19.10939e-14
19.10939e-13
21.821878e-12
32.732817e-12
43.643756e-12
54.554695e-12
109.10939e-12
201.821878e-11
302.732817e-11
403.643756e-11
504.554695e-11
1009.10939e-11
5004.554695e-10
10009.10939e-10

Frequently asked questions

How many femtograms is 1 electron mass (rest)?
1 electron mass (rest) equals 9.10939e-13 femtogram.
How do I convert electron mass (rest) to femtograms?
Multiply the value in electron mass (rest) by 9.10939e-13 to get femtograms.
How do I convert femtograms back to electron mass (rest)?
Multiply the value in femtograms by 1.097768e+12, or use the Femtogram to Electron Mass (rest) converter.
How many femtograms is 100 electron mass (rest)?
100 electron mass (rest) equals 9.10939e-11 femtograms, because 100 × 9.10939e-13 = 9.10939e-11.

Convert Electron Mass (rest) to other weight units

Show all Electron Mass (rest) conversions
Metric / SI (18 units)
Electron Mass (rest) to Attogram (ag) Electron Mass (rest) to Femtogram (fg) Electron Mass (rest) to Picogram (pg) Electron Mass (rest) to Nanogram (ng) Electron Mass (rest) to Microgram (µg) Electron Mass (rest) to Milligram (mg) Electron Mass (rest) to Centigram (cg) Electron Mass (rest) to Decigram (dg) Electron Mass (rest) to Gram (g) Electron Mass (rest) to Dekagram (dag) Electron Mass (rest) to Hectogram (hg) Electron Mass (rest) to Kilogram (kg) Electron Mass (rest) to Quintal (metric) (q) Electron Mass (rest) to Metric Ton (t) Electron Mass (rest) to Gigagram (Gg) Electron Mass (rest) to Teragram (Tg) Electron Mass (rest) to Petagram (Pg) Electron Mass (rest) to Exagram (Eg)
Avoirdupois (15 units)
Electron Mass (rest) to Grain (gr) Electron Mass (rest) to Dram (avoirdupois) (dr) Electron Mass (rest) to Ounce (oz) Electron Mass (rest) to Pound (lb) Electron Mass (rest) to Clove (clove) Electron Mass (rest) to Stone (US) (st) Electron Mass (rest) to Stone (UK) (st) Electron Mass (rest) to Quarter (US) (qr) Electron Mass (rest) to Quarter (UK) (qr) Electron Mass (rest) to Hundredweight (US) (cwt) Electron Mass (rest) to Hundredweight (UK) (cwt) Electron Mass (rest) to Wey (wey) Electron Mass (rest) to Kilopound (kip) (kip) Electron Mass (rest) to Ton (short, US) (sh tn) Electron Mass (rest) to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Electron Mass (rest) to Point (1/100 carat) (pt) Electron Mass (rest) to Carat (metric) (ct) Electron Mass (rest) to Scruple (apothecary) (s ap) Electron Mass (rest) to Pennyweight (dwt) Electron Mass (rest) to Momme (mom) Electron Mass (rest) to Mace (mace) Electron Mass (rest) to Dram (apothecary/troy) (dr ap) Electron Mass (rest) to Troy Ounce (oz t) Electron Mass (rest) to Tael (tael) Electron Mass (rest) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Electron Mass (rest) to Ratti (ratti) Electron Mass (rest) to Masha (masha) Electron Mass (rest) to Tola (tola) Electron Mass (rest) to Chittack (Chatank) (chittack) Electron Mass (rest) to Seer (Ser) (seer) Electron Mass (rest) to Maund (Mann) (maund)
Scientific / Atomic (8 units)
Electron Mass (rest) to MeV/c2 (MeV/c²) Electron Mass (rest) to Muon Mass (mµ) Electron Mass (rest) to Atomic Mass Unit (u) Electron Mass (rest) to Proton Mass (mp) Electron Mass (rest) to Neutron Mass (mn) Electron Mass (rest) to Deuteron Mass (md) Electron Mass (rest) to Carbon-12 Atom Mass (C-12) Electron Mass (rest) to Planck Mass (mP)
Astronomical (4 units)
Electron Mass (rest) to Lunar Mass (Moon) (M☾) Electron Mass (rest) to Earth's Mass (M⊕) Electron Mass (rest) to Jupiter Mass (MJ) Electron Mass (rest) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Electron Mass (rest) to Lepton (Biblical Roman) (lepton) Electron Mass (rest) to Quadrans (Biblical Roman) (quadrans) Electron Mass (rest) to Assarion (Biblical Roman) (assarion) Electron Mass (rest) to Gerah (Biblical Hebrew) (gerah) Electron Mass (rest) to Drachma (Biblical Greek) (drachma) Electron Mass (rest) to Denarius (Biblical Roman) (denarius) Electron Mass (rest) to Bekan (Biblical Hebrew) (bekah) Electron Mass (rest) to Didrachma (Biblical Greek) (didrachma) Electron Mass (rest) to Shekel (Biblical Hebrew) (shekel) Electron Mass (rest) to Tetradrachma (Biblical Greek) (tetra) Electron Mass (rest) to Mina (Biblical Greek) (mina) Electron Mass (rest) to Mina (Biblical Hebrew) (mina) Electron Mass (rest) to Talent (Biblical Greek) (talent) Electron Mass (rest) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Electron Mass (rest) to Poundal (pdl) Electron Mass (rest) to Ton (assay) (US) (AT) Electron Mass (rest) to Ton (assay) (UK) (AT) Electron Mass (rest) to Kilogram-force square second/meter (hyl) Electron Mass (rest) to Slug (slug)

Sources & references

Conversion factor (1 me = 9.10939e-13 fg) verified against the following authoritative sources:

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