Mass and Weight · Unit Converter

Convert Dram (avoirdupois) to Proton Mass

Convert drams (avoirdupois) to proton mass instantly. 1 dram (avoirdupois) = 1.059321e+24 proton mass — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Proton Mass to Dram (avoirdupois) 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

Avoirdupois

Dram (avoirdupois)

What is a dram (avoirdupois)?

The avoirdupois dram (dr) equals one-sixteenth of an ounce, about 1.77 grams.

Origin of the dram (avoirdupois)

From Greek 'drachma' through Latin 'dragma'.

Where it is used

Historically pharmacy; today occasional cooking and firearms (powder) use.

When and where it was developed

Defined as 1/256 of the avoirdupois pound.

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.

Dram (avoirdupois) 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 drams (avoirdupois) and proton mass:

1 dr = 1.059321e+24 mp
1 mp = 9.440007e-25 dr

To convert drams (avoirdupois) to proton mass, multiply the value in drams (avoirdupois) by 1.059321e+24. To reverse, multiply proton mass by 9.440007e-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 Dram (avoirdupois) converter for the reverse direction.

Step-by-step: convert drams (avoirdupois) to proton mass

  1. Write down the value in drams (avoirdupois) (dr).
  2. Multiply that value by the factor 1.059321e+24.
  3. The product is the equivalent value in proton mass (mp).
  4. To reverse, multiply the proton mass value by 9.440007e-25.

Worked examples

Example 1 — Convert 1 dr to mp:
1 × 1.059321e+24 = 1.059321e+24 mp

Example 2 — Convert 100 dr to mp:
100 × 1.059321e+24 = 1.059321e+26 mp

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

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

1 dr × 1.059321e+24 = 1.059321e+24 mp

Real-world example — Centimeter to wavelength scale

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

1 dr × 1.059321e+24 = 1.059321e+24 mp

Dram (avoirdupois) to Proton Mass conversion table

Standard reference values for converting drams (avoirdupois) to proton mass:

Dram (avoirdupois) [dr]Proton Mass [mp]
0.011.059321e+22
0.11.059321e+23
11.059321e+24
22.118643e+24
33.177964e+24
44.237285e+24
55.296606e+24
101.059321e+25
202.118643e+25
303.177964e+25
404.237285e+25
505.296606e+25
1001.059321e+26
5005.296606e+26
10001.059321e+27

Frequently asked questions

How many proton mass is 1 dram (avoirdupois)?
1 dram (avoirdupois) equals 1.059321e+24 proton mass.
How do I convert drams (avoirdupois) to proton mass?
Multiply the value in drams (avoirdupois) by 1.059321e+24 to get proton mass.
How do I convert proton mass back to drams (avoirdupois)?
Multiply the value in proton mass by 9.440007e-25, or use the Proton Mass to Dram (avoirdupois) converter.
How many proton mass is 100 drams (avoirdupois)?
100 drams (avoirdupois) equals 1.059321e+26 proton mass, because 100 × 1.059321e+24 = 1.059321e+26.

Convert Dram (avoirdupois) to other weight units

Show all Dram (avoirdupois) conversions
Metric / SI (18 units)
Dram (avoirdupois) to Attogram (ag) Dram (avoirdupois) to Femtogram (fg) Dram (avoirdupois) to Picogram (pg) Dram (avoirdupois) to Nanogram (ng) Dram (avoirdupois) to Microgram (µg) Dram (avoirdupois) to Milligram (mg) Dram (avoirdupois) to Centigram (cg) Dram (avoirdupois) to Decigram (dg) Dram (avoirdupois) to Gram (g) Dram (avoirdupois) to Dekagram (dag) Dram (avoirdupois) to Hectogram (hg) Dram (avoirdupois) to Kilogram (kg) Dram (avoirdupois) to Quintal (metric) (q) Dram (avoirdupois) to Metric Ton (t) Dram (avoirdupois) to Gigagram (Gg) Dram (avoirdupois) to Teragram (Tg) Dram (avoirdupois) to Petagram (Pg) Dram (avoirdupois) to Exagram (Eg)
Avoirdupois (14 units)
Dram (avoirdupois) to Grain (gr) Dram (avoirdupois) to Ounce (oz) Dram (avoirdupois) to Pound (lb) Dram (avoirdupois) to Clove (clove) Dram (avoirdupois) to Stone (US) (st) Dram (avoirdupois) to Stone (UK) (st) Dram (avoirdupois) to Quarter (US) (qr) Dram (avoirdupois) to Quarter (UK) (qr) Dram (avoirdupois) to Hundredweight (US) (cwt) Dram (avoirdupois) to Hundredweight (UK) (cwt) Dram (avoirdupois) to Wey (wey) Dram (avoirdupois) to Kilopound (kip) (kip) Dram (avoirdupois) to Ton (short, US) (sh tn) Dram (avoirdupois) to Ton (long, UK) (long tn)
Troy & Apothecary (10 units)
Dram (avoirdupois) to Point (1/100 carat) (pt) Dram (avoirdupois) to Carat (metric) (ct) Dram (avoirdupois) to Scruple (apothecary) (s ap) Dram (avoirdupois) to Pennyweight (dwt) Dram (avoirdupois) to Momme (mom) Dram (avoirdupois) to Mace (mace) Dram (avoirdupois) to Dram (apothecary/troy) (dr ap) Dram (avoirdupois) to Troy Ounce (oz t) Dram (avoirdupois) to Tael (tael) Dram (avoirdupois) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Dram (avoirdupois) to Ratti (ratti) Dram (avoirdupois) to Masha (masha) Dram (avoirdupois) to Tola (tola) Dram (avoirdupois) to Chittack (Chatank) (chittack) Dram (avoirdupois) to Seer (Ser) (seer) Dram (avoirdupois) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Dram (avoirdupois) to Electron Mass (rest) (me) Dram (avoirdupois) to MeV/c2 (MeV/c²) Dram (avoirdupois) to Muon Mass (mµ) Dram (avoirdupois) to Atomic Mass Unit (u) Dram (avoirdupois) to Proton Mass (mp) Dram (avoirdupois) to Neutron Mass (mn) Dram (avoirdupois) to Deuteron Mass (md) Dram (avoirdupois) to Carbon-12 Atom Mass (C-12) Dram (avoirdupois) to Planck Mass (mP)
Astronomical (4 units)
Dram (avoirdupois) to Lunar Mass (Moon) (M☾) Dram (avoirdupois) to Earth's Mass (M⊕) Dram (avoirdupois) to Jupiter Mass (MJ) Dram (avoirdupois) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Dram (avoirdupois) to Lepton (Biblical Roman) (lepton) Dram (avoirdupois) to Quadrans (Biblical Roman) (quadrans) Dram (avoirdupois) to Assarion (Biblical Roman) (assarion) Dram (avoirdupois) to Gerah (Biblical Hebrew) (gerah) Dram (avoirdupois) to Drachma (Biblical Greek) (drachma) Dram (avoirdupois) to Denarius (Biblical Roman) (denarius) Dram (avoirdupois) to Bekan (Biblical Hebrew) (bekah) Dram (avoirdupois) to Didrachma (Biblical Greek) (didrachma) Dram (avoirdupois) to Shekel (Biblical Hebrew) (shekel) Dram (avoirdupois) to Tetradrachma (Biblical Greek) (tetra) Dram (avoirdupois) to Mina (Biblical Greek) (mina) Dram (avoirdupois) to Mina (Biblical Hebrew) (mina) Dram (avoirdupois) to Talent (Biblical Greek) (talent) Dram (avoirdupois) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Dram (avoirdupois) to Poundal (pdl) Dram (avoirdupois) to Ton (assay) (US) (AT) Dram (avoirdupois) to Ton (assay) (UK) (AT) Dram (avoirdupois) to Kilogram-force square second/meter (hyl) Dram (avoirdupois) to Slug (slug)

Sources & references

Conversion factor (1 dr = 1.059321e+24 mp) verified against the following authoritative sources:

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