Mass and Weight · Unit Converter

Convert Dram (apothecary/troy) to Planck Mass

Convert drams (apothecary/troy) to planck mass instantly. 1 dram (apothecary/troy) = 178615.1853025897 planck mass — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Planck Mass to Dram (apothecary/troy) 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

Troy & Apothecary

Dram (apothecary/troy)

What is a dram (apothecary/troy)?

The apothecary (troy) dram equals one-eighth of a troy ounce, about 3.888 grams.

Origin of the dram (apothecary/troy)

From the apothecaries' system rooted in the Greek 'drachma'.

Where it is used

Historical pharmacy and medicine compounding.

When and where it was developed

Part of the apothecaries' system of weights used through the 19th century.

Scientific / Atomic

Planck Mass

What is a planck mass?

The Planck mass equals about 2.18E-8 kg, formed from the constants h-bar, c, and G.

Origin of the planck mass

Introduced by Max Planck in 1899 as part of a system of natural units.

Where it is used

Theoretical physics and quantum-gravity research.

When and where it was developed

Defined by Planck in 1899 from fundamental constants.

Dram (apothecary/troy) to Planck 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 (apothecary/troy) and planck mass:

1 dr ap = 178615.1853025897 mP
1 mP = 5.598628e-6 dr ap

To convert drams (apothecary/troy) to planck mass, multiply the value in drams (apothecary/troy) by 178615.1853025897. To reverse, multiply planck mass by 5.598628e-6.

How to use this converter

Type a value into the calculator. The result in planck 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 Planck Mass to Dram (apothecary/troy) converter for the reverse direction.

Step-by-step: convert drams (apothecary/troy) to planck mass

  1. Write down the value in drams (apothecary/troy) (dr ap).
  2. Multiply that value by the factor 178615.1853025897.
  3. The product is the equivalent value in planck mass (mP).
  4. To reverse, multiply the planck mass value by 5.598628e-6.

Worked examples

Example 1 — Convert 1 dr ap to mP:
1 × 178615.1853025897 = 178615.1853025897 mP

Example 2 — Convert 100 dr ap to mP:
100 × 178615.1853025897 = 1.786152e+7 mP

Real-world example — Centimeter to wavelength scale

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

1 dr ap × 178615.1853025897 = 178615.1853025897 mP

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

One dram (apothecary/troy) equals 10 million planck mass — useful for physics curricula that relate everyday measurements to atomic and optical scales.

1 dr ap × 178615.1853025897 = 178615.1853025897 mP

Dram (apothecary/troy) to Planck Mass conversion table

Standard reference values for converting drams (apothecary/troy) to planck mass:

Dram (apothecary/troy) [dr ap]Planck Mass [mP]
0.011786.1518530259
0.117861.518530259
1178615.1853025897
2357230.3706051794
3535845.5559077691
4714460.7412103588
5893075.9265129485
101786151.8530258969
203572303.7060517939
305358455.5590776913
407144607.4121035878
508930759.2651294842
1001.786152e+7
5008.930759e+7
10001.786152e+8

Frequently asked questions

How many planck mass is 1 dram (apothecary/troy)?
1 dram (apothecary/troy) equals 178615.1853025897 planck mass.
How do I convert drams (apothecary/troy) to planck mass?
Multiply the value in drams (apothecary/troy) by 178615.1853025897 to get planck mass.
How do I convert planck mass back to drams (apothecary/troy)?
Multiply the value in planck mass by 5.598628e-6, or use the Planck Mass to Dram (apothecary/troy) converter.
How many planck mass is 100 drams (apothecary/troy)?
100 drams (apothecary/troy) equals 1.786152e+7 planck mass, because 100 × 178615.1853025897 = 1.786152e+7.

Convert Dram (apothecary/troy) to other weight units

Show all Dram (apothecary/troy) conversions
Metric / SI (18 units)
Dram (apothecary/troy) to Attogram (ag) Dram (apothecary/troy) to Femtogram (fg) Dram (apothecary/troy) to Picogram (pg) Dram (apothecary/troy) to Nanogram (ng) Dram (apothecary/troy) to Microgram (µg) Dram (apothecary/troy) to Milligram (mg) Dram (apothecary/troy) to Centigram (cg) Dram (apothecary/troy) to Decigram (dg) Dram (apothecary/troy) to Gram (g) Dram (apothecary/troy) to Dekagram (dag) Dram (apothecary/troy) to Hectogram (hg) Dram (apothecary/troy) to Kilogram (kg) Dram (apothecary/troy) to Quintal (metric) (q) Dram (apothecary/troy) to Metric Ton (t) Dram (apothecary/troy) to Gigagram (Gg) Dram (apothecary/troy) to Teragram (Tg) Dram (apothecary/troy) to Petagram (Pg) Dram (apothecary/troy) to Exagram (Eg)
Avoirdupois (15 units)
Dram (apothecary/troy) to Grain (gr) Dram (apothecary/troy) to Dram (avoirdupois) (dr) Dram (apothecary/troy) to Ounce (oz) Dram (apothecary/troy) to Pound (lb) Dram (apothecary/troy) to Clove (clove) Dram (apothecary/troy) to Stone (US) (st) Dram (apothecary/troy) to Stone (UK) (st) Dram (apothecary/troy) to Quarter (US) (qr) Dram (apothecary/troy) to Quarter (UK) (qr) Dram (apothecary/troy) to Hundredweight (US) (cwt) Dram (apothecary/troy) to Hundredweight (UK) (cwt) Dram (apothecary/troy) to Wey (wey) Dram (apothecary/troy) to Kilopound (kip) (kip) Dram (apothecary/troy) to Ton (short, US) (sh tn) Dram (apothecary/troy) to Ton (long, UK) (long tn)
Troy & Apothecary (9 units)
Dram (apothecary/troy) to Point (1/100 carat) (pt) Dram (apothecary/troy) to Carat (metric) (ct) Dram (apothecary/troy) to Scruple (apothecary) (s ap) Dram (apothecary/troy) to Pennyweight (dwt) Dram (apothecary/troy) to Momme (mom) Dram (apothecary/troy) to Mace (mace) Dram (apothecary/troy) to Troy Ounce (oz t) Dram (apothecary/troy) to Tael (tael) Dram (apothecary/troy) to Pound (troy/apothecary) (lb t)
Indian / South Asian (6 units)
Dram (apothecary/troy) to Ratti (ratti) Dram (apothecary/troy) to Masha (masha) Dram (apothecary/troy) to Tola (tola) Dram (apothecary/troy) to Chittack (Chatank) (chittack) Dram (apothecary/troy) to Seer (Ser) (seer) Dram (apothecary/troy) to Maund (Mann) (maund)
Scientific / Atomic (9 units)
Dram (apothecary/troy) to Electron Mass (rest) (me) Dram (apothecary/troy) to MeV/c2 (MeV/c²) Dram (apothecary/troy) to Muon Mass (mµ) Dram (apothecary/troy) to Atomic Mass Unit (u) Dram (apothecary/troy) to Proton Mass (mp) Dram (apothecary/troy) to Neutron Mass (mn) Dram (apothecary/troy) to Deuteron Mass (md) Dram (apothecary/troy) to Carbon-12 Atom Mass (C-12) Dram (apothecary/troy) to Planck Mass (mP)
Astronomical (4 units)
Dram (apothecary/troy) to Lunar Mass (Moon) (M☾) Dram (apothecary/troy) to Earth's Mass (M⊕) Dram (apothecary/troy) to Jupiter Mass (MJ) Dram (apothecary/troy) to Sun's Mass (M☉)
Biblical / Ancient (14 units)
Dram (apothecary/troy) to Lepton (Biblical Roman) (lepton) Dram (apothecary/troy) to Quadrans (Biblical Roman) (quadrans) Dram (apothecary/troy) to Assarion (Biblical Roman) (assarion) Dram (apothecary/troy) to Gerah (Biblical Hebrew) (gerah) Dram (apothecary/troy) to Drachma (Biblical Greek) (drachma) Dram (apothecary/troy) to Denarius (Biblical Roman) (denarius) Dram (apothecary/troy) to Bekan (Biblical Hebrew) (bekah) Dram (apothecary/troy) to Didrachma (Biblical Greek) (didrachma) Dram (apothecary/troy) to Shekel (Biblical Hebrew) (shekel) Dram (apothecary/troy) to Tetradrachma (Biblical Greek) (tetra) Dram (apothecary/troy) to Mina (Biblical Greek) (mina) Dram (apothecary/troy) to Mina (Biblical Hebrew) (mina) Dram (apothecary/troy) to Talent (Biblical Greek) (talent) Dram (apothecary/troy) to Talent (Biblical Hebrew) (talent)
Force / Engineering (5 units)
Dram (apothecary/troy) to Poundal (pdl) Dram (apothecary/troy) to Ton (assay) (US) (AT) Dram (apothecary/troy) to Ton (assay) (UK) (AT) Dram (apothecary/troy) to Kilogram-force square second/meter (hyl) Dram (apothecary/troy) to Slug (slug)

Sources & references

Conversion factor (1 dr ap = 178615.1853025897 mP) verified against the following authoritative sources:

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