Mass and Weight · Unit Converter

Convert Femtogram to Pennyweight

Convert femtograms to pennyweights instantly. 1 femtogram = 6.430149e-16 pennyweight — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Pennyweight 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.

Troy & Apothecary

Pennyweight

What is a pennyweight?

The pennyweight (dwt) equals one-twentieth of a troy ounce, 24 grains (about 1.555 g).

Origin of the pennyweight

From the mass of a medieval English silver penny; symbol dwt from 'denarius weight'.

Where it is used

Jewelry making and precious-metal scrap valuation in the US.

When and where it was developed

Derived from the medieval English coinage system.

Femtogram to Pennyweight conversion formula

The relationship between femtograms and pennyweights:

1 fg = 6.430149e-16 dwt
1 dwt = 1.555174e+15 fg

To convert femtograms to pennyweights, multiply the value in femtograms by 6.430149e-16. To reverse, multiply pennyweights by 1.555174e+15.

How to use this converter

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

Step-by-step: convert femtograms to pennyweights

  1. Write down the value in femtograms (fg).
  2. Multiply that value by the factor 6.430149e-16.
  3. The product is the equivalent value in pennyweights (dwt).
  4. To reverse, multiply the pennyweight value by 1.555174e+15.

Worked examples

Example 1 — Convert 1 fg to dwt:
1 × 6.430149e-16 = 6.430149e-16 dwt

Example 2 — Convert 100 fg to dwt:
100 × 6.430149e-16 = 6.430149e-14 dwt

Real-world example — Sub-micron to millimeter

500,000 femtograms converts to a small everyday quantity in pennyweights — useful when relating optical-wavelength specifications to physical mounting hardware.

500000 fg × 6.430149e-16 = 3.215075e-10 dwt

Real-world example — From wavelengths to millimeter-scale objects

A value of one million femtograms sounds vast at the atomic scale but converts to a small everyday quantity in pennyweights — useful when relating optical-wavelength specifications to physical mounting hardware.

1000000 fg × 6.430149e-16 = 6.430149e-10 dwt

Femtogram to Pennyweight conversion table

Standard reference values for converting femtograms to pennyweights:

Femtogram [fg]Pennyweight [dwt]
0.016.430149e-18
0.16.430149e-17
16.430149e-16
21.28603e-15
31.929045e-15
42.57206e-15
53.215075e-15
106.430149e-15
201.28603e-14
301.929045e-14
402.57206e-14
503.215075e-14
1006.430149e-14
5003.215075e-13
10006.430149e-13

Frequently asked questions

How many pennyweights is 1 femtogram?
1 femtogram equals 6.430149e-16 pennyweight.
How do I convert femtograms to pennyweights?
Multiply the value in femtograms by 6.430149e-16 to get pennyweights.
How do I convert pennyweights back to femtograms?
Multiply the value in pennyweights by 1.555174e+15, or use the Pennyweight to Femtogram converter.
How many pennyweights is 100 femtograms?
100 femtograms equals 6.430149e-14 pennyweights, because 100 × 6.430149e-16 = 6.430149e-14.

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 = 6.430149e-16 dwt) verified against the following authoritative sources:

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