Instant · Precise · Universal
47 units available
6 categories total
To liters: multiply by 10⁻¹⁸. To femtoliters: divide by 1,000. To cubic nanometers: 1 aL = 10⁶ nm³.
1 aL = 10⁻¹⁸ L = 10⁻²¹ m³ = 10⁻¹⁵ µL. One femtoliter = 1,000 aL.
For example, 1 Attoliter (aL) = 2.000000e-14 Drop (gtt).
| Attoliter (aL) | Drop (gtt) |
|---|---|
| 0.1 | 2.000000e-15 |
| 0.5 | 1.000000e-14 |
| 1 | 2.000000e-14 |
| 2 | 4.000000e-14 |
| 5 | 1.000000e-13 |
| 10 | 2.000000e-13 |
| 25 | 5.000000e-13 |
| 50 | 1.000000e-12 |
| 100 | 2.000000e-12 |
| 500 | 1.000000e-11 |
| 1000 | 2.000000e-11 |
The attoliter is an extremely small unit of volume equal to 10⁻¹⁸ liters, or one quintillionth of a liter.
1 aL = 10⁻¹⁸ L = 10⁻²¹ m³ = 10⁻¹⁵ µL. One femtoliter = 1,000 aL.
To liters: multiply by 10⁻¹⁸. To femtoliters: divide by 1,000. To cubic nanometers: 1 aL = 10⁶ nm³.
Measuring individual molecular reaction volumes, nano-droplet volumes, and single-cell compartments.
A typical virus capsid can enclose a volume of just a few attoliters. The interior of a ribosome is measured in attoliters.
Confusing attoliters with femtoliters — there are 1,000 aL in 1 fL. The scale difference is enormous.
Prefix ladder: milli → micro → nano → pico → femto → atto. Each step is 10⁻³ smaller than the last.
The drop (medical/pharmacological) is an approximate unit of volume equal to about 0.05 milliliters, or 50 microliters.
1 drop ≈ 0.05 mL = 50 µL ≈ 1/20 mL. Approximately 20 drops = 1 mL (for water-like liquids).
To mL: multiply by 0.05 (approximate). To µL: multiply by 50. 20 drops ≈ 1 mL for aqueous solutions.
Eye drop medication, ear drops, essential oil use, flavoring extracts in cooking, and IV drip rate measurement.
The size of a drop varies significantly: water drops from a glass dropper (~50 µL) differ from rain drops (~50,000–100,000 µL) by a factor of 1,000.
Assuming all drops are the same size — oily liquids produce larger drops than water. Always check the dropper calibration.
20 drops ≈ 1 mL for water-based solutions. In IV therapy, standard drip sets deliver 10, 15, or 20 drops/mL depending on the design.



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