Mass and Weight · Unit Converter

Convert Scruple (apothecary) to Attogram

Convert scruples (apothecary) to attograms instantly. 1 scruple (apothecary) = 1.295978e+18 attogram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Attogram to Scruple (apothecary) 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

Scruple (apothecary)

What is a scruple (apothecary)?

The apothecary scruple equals 20 grains, about 1.296 grams.

Origin of the scruple (apothecary)

From Latin 'scrupulus', a small sharp pebble used as a tiny weight.

Where it is used

Historical apothecary dosing of powders.

When and where it was developed

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

Metric / SI

Attogram

What is a attogram?

An attogram (ag) equals 10^-21 kilogram.

Origin of the attogram

From the SI prefix 'atto-' (from Danish 'atten', eighteen).

Where it is used

Frontier nanoscience and single-molecule mass detection.

When and where it was developed

The atto- prefix was adopted by the CGPM in 1975.

Scruple (apothecary) to Attogram conversion formula

The relationship between scruples (apothecary) and attograms:

1 s ap = 1.295978e+18 ag
1 ag = 7.716179e-19 s ap

To convert scruples (apothecary) to attograms, multiply the value in scruples (apothecary) by 1.295978e+18. To reverse, multiply attograms by 7.716179e-19.

How to use this converter

Type a value into the calculator. The result in attograms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Attogram to Scruple (apothecary) converter for the reverse direction.

Step-by-step: convert scruples (apothecary) to attograms

  1. Write down the value in scruples (apothecary) (s ap).
  2. Multiply that value by the factor 1.295978e+18.
  3. The product is the equivalent value in attograms (ag).
  4. To reverse, multiply the attogram value by 7.716179e-19.

Worked examples

Example 1 — Convert 1 s ap to ag:
1 × 1.295978e+18 = 1.295978e+18 ag

Example 2 — Convert 100 s ap to ag:
100 × 1.295978e+18 = 1.295978e+20 ag

Real-world example — Centimeter to wavelength scale

One scruple (apothecary) equals 10 million attograms. Physics curricula use this kind of conversion to relate everyday measurements to atomic and optical scales.

1 s ap × 1.295978e+18 = 1.295978e+18 ag

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

One scruple (apothecary) equals 10 million attograms — useful for physics curricula that relate everyday measurements to atomic and optical scales.

1 s ap × 1.295978e+18 = 1.295978e+18 ag

Scruple (apothecary) to Attogram conversion table

Standard reference values for converting scruples (apothecary) to attograms:

Scruple (apothecary) [s ap]Attogram [ag]
0.011.295978e+16
0.11.295978e+17
11.295978e+18
22.591956e+18
33.887935e+18
45.183913e+18
56.479891e+18
101.295978e+19
202.591956e+19
303.887935e+19
405.183913e+19
506.479891e+19
1001.295978e+20
5006.479891e+20
10001.295978e+21

Frequently asked questions

How many attograms is 1 scruple (apothecary)?
1 scruple (apothecary) equals 1.295978e+18 attogram.
How do I convert scruples (apothecary) to attograms?
Multiply the value in scruples (apothecary) by 1.295978e+18 to get attograms.
How do I convert attograms back to scruples (apothecary)?
Multiply the value in attograms by 7.716179e-19, or use the Attogram to Scruple (apothecary) converter.
How many attograms is 100 scruples (apothecary)?
100 scruples (apothecary) equals 1.295978e+20 attograms, because 100 × 1.295978e+18 = 1.295978e+20.

Convert Scruple (apothecary) to other weight units

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

Sources & references

Conversion factor (1 s ap = 1.295978e+18 ag) verified against the following authoritative sources:

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