Zeptomole is 1e-21 mole units.
Zeptomoles to Attomoles Converter — zmol to amol
Convert Zeptomole (zmol) to Attomole (amol) using the exact conversion factor (1 zeptomole = 0.001 attomole). See the formula, worked examples, and conversion table.
Zeptomoles to Attomoles converter
Converter
Chemistry Converter
Convert concentration, molarity, amount, and laboratory scientific units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
Attomole is 1e-18 mole units.
Result = input x 1e-21 / 1e-18.
Amount units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Zeptomoles to Attomoles
Zeptomole and Attomole both measure mass concentration — how much of a substance is dissolved or dispersed in a given volume — a core calculation for preparing lab solutions, checking water quality against a regulatory limit, or formulating a pharmaceutical dose. Specifically: Zeptomole is 1e-21 mole units, and attomole is 1e-18 mole units.
Formula
attomoles = zeptomoles × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptomole equals 1e-21 base units, and 1 attomole equals 1e-18 base units, so dividing one by the other gives the direct zeptomole-to-attomole factor of 0.001.
Simple example
1 zmol × 0.001 = 0.001 amol
1 zeptomole = 0.001 attomoles.
Real-world example
100 zmol × 0.001 = 0.1 amol
100 zeptomoles = 0.1 attomoles.
Conversion table
| Zeptomole (zmol) | Attomole (amol) |
|---|---|
| 0.001 zmol | 0.000001 amol |
| 0.01 zmol | 0.00001 amol |
| 0.1 zmol | 0.0001 amol |
| 1 zmol | 0.001 amol |
| 10 zmol | 0.01 amol |
| 100 zmol | 0.1 amol |
Reverse conversion: Attomole to Zeptomole
0.001 amol × 1000 = 1 zmol
0.001 attomoles = 1 zeptomoles.
zeptomoles = attomoles × 1000
For a page dedicated to this direction, see Attomole to Zeptomole.
Understanding the Zeptomole (zmol)
Zeptomole is 1e-21 mole units.
Understanding the Attomole (amol)
Attomole is 1e-18 mole units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attomoles are in 1 zeptomole?
1 zeptomole equals 0.001 attomoles, using the exact defined conversion factor rather than an estimate.
How do I convert zeptomole to attomole?
Multiply the zeptomole value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert attomole back to zeptomole?
Use the reverse factor: 1 attomole equals 1,000 zeptomoles. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptomole?
Zeptomole (zmol) is a unit of chemistry.
What is a attomole?
Attomole (amol) is a unit of chemistry.
Is the zeptomole to attomole conversion exact?
Yes. Both zeptomole and attomole are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
What's the difference between mass concentration and molarity?
Mass concentration expresses how much mass of a substance is present per unit volume (for example, grams per liter). Molarity expresses the amount in moles per liter instead, which accounts for the substance's molecular weight. This category converts mass-concentration units.