Mass and Weight · Unit Converter

Convert Poundal to Proton Mass

Convert poundals to proton mass instantly. 1 poundal = 8.421933e+24 proton mass — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Proton Mass to Poundal 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

Force / Engineering

Poundal

What is a poundal?

The poundal (pdl) is the FPS absolute unit of force; its mass-equivalent on this scale is about 0.0141 kg.

Origin of the poundal

Defined in the foot-pound-second absolute system in the late 19th century.

Where it is used

Early 20th-century physics and engineering.

When and where it was developed

Introduced in the absolute FPS system as an alternative to gravitational units.

Scientific / Atomic

Proton Mass

What is a proton mass?

The proton rest mass is about 1.6726E-27 kg.

Origin of the proton mass

The mass of the proton, the positively charged nucleon.

Where it is used

Nuclear and particle physics, and chemistry.

When and where it was developed

Quantified after Rutherford identified the proton around 1917-1920.

Poundal to Proton Mass 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 poundals and proton mass:

1 pdl = 8.421933e+24 mp

1 mp = 1.187376e-25 pdl

To convert poundals to proton mass, multiply the value in poundals by 8.421933e+24. To reverse, multiply proton mass by 1.187376e-25.

How to use this converter

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

Step-by-step: convert poundals to proton mass

Write down the value in poundals (pdl).
Multiply that value by the factor 8.421933e+24.
The product is the equivalent value in proton mass (mp).
To reverse, multiply the proton mass value by 1.187376e-25.

Worked examples

Example 1 — Convert 1 pdl to mp:
1 × 8.421933e+24 = 8.421933e+24 mp

Example 2 — Convert 100 pdl to mp:
100 × 8.421933e+24 = 8.421933e+26 mp

Real-world example — Small-scale to atomic-scale

One poundal equals 10 million proton mass — useful for physics curricula that relate everyday measurements to atomic and optical scales.

1 pdl × 8.421933e+24 = 8.421933e+24 mp

Real-world example — Centimeter to wavelength scale

One poundal equals 10 million proton mass. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.

1 pdl × 8.421933e+24 = 8.421933e+24 mp

Poundal to Proton Mass conversion table

Standard reference values for converting poundals to proton mass:

Poundal [pdl]	Proton Mass [mp]
0.01	8.421933e+22
0.1	8.421933e+23
1	8.421933e+24
2	1.684387e+25
3	2.52658e+25
4	3.368773e+25
5	4.210966e+25
10	8.421933e+25
20	1.684387e+26
30	2.52658e+26
40	3.368773e+26
50	4.210966e+26
100	8.421933e+26
500	4.210966e+27
1000	8.421933e+27

Frequently asked questions

How many proton mass is 1 poundal?

1 poundal equals 8.421933e+24 proton mass.

How do I convert poundals to proton mass?

Multiply the value in poundals by 8.421933e+24 to get proton mass.

How do I convert proton mass back to poundals?

Multiply the value in proton mass by 1.187376e-25, or use the Proton Mass to Poundal converter.

How many proton mass is 100 poundals?

100 poundals equals 8.421933e+26 proton mass, because 100 × 8.421933e+24 = 8.421933e+26.

Convert Poundal to other weight units

Show all Poundal conversions

Metric / SI (18 units)

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

Avoirdupois (15 units)

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

Troy & Apothecary (10 units)

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

Indian / South Asian (6 units)

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

Scientific / Atomic (9 units)

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

Astronomical (4 units)

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

Biblical / Ancient (14 units)

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

Force / Engineering (4 units)

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

Sources & references

Conversion factor (1 pdl = 8.421933e+24 mp) 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.