Femtoliter is 1e-15 liter units.
Femtoliters to Teaspoons Converter — fL to tsp
Convert Femtoliter (fL) to Teaspoon (tsp) using the exact conversion factor (1 femtoliter = 2.028841e-13 teaspoon). See the formula, worked examples, conversion table, and common uses.
Femtoliters to Teaspoons converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
A US teaspoon is one third of a US tablespoon.
Result = input x 1e-18 / 4.92892159e-6.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtoliters to Teaspoons
Femtoliter and Teaspoon appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Specifically: Femtoliter is 1e-15 liter units, and a US teaspoon is one third of a US tablespoon.
Formula
teaspoons = femtoliters × 2.028841e-13
This factor comes from each unit's defined relationship to the category's base unit: 1 femtoliter equals 1e-18 base units, and 1 teaspoon equals 0.00000492892159375 base units, so dividing one by the other gives the direct femtoliter-to-teaspoon factor of 2.028841e-13.
Simple example
1 fL × 2.028841e-13 = 2.028841e-13 tsp
1 femtoliter = 2.028841e-13 teaspoons.
Real-world example
10 fL × 2.028841e-13 = 2.028841e-12 tsp
10 femtoliters = 2.028841e-12 teaspoons.
Conversion table
| Femtoliter (fL) | Teaspoon (tsp) |
|---|---|
| 1 fL | 2.028841e-13 tsp |
| 5 fL | 1.014421e-12 tsp |
| 10 fL | 2.028841e-12 tsp |
| 25 fL | 5.072103e-12 tsp |
| 50 fL | 1.014421e-11 tsp |
| 100 fL | 2.028841e-11 tsp |
Reverse conversion: Teaspoon to Femtoliter
2.028841e-13 tsp × 4.928922e+12 = 0.9999998215 fL
2.028841e-13 teaspoons = 0.9999998215 femtoliters.
femtoliters = teaspoons × 4.928922e+12
For a page dedicated to this direction, see Teaspoon to Femtoliter.
Understanding the Femtoliter (fL)
Femtoliter is 1e-15 liter units.
Understanding the Teaspoon
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
Where it's used: United States (cooking and recipe measurement)
Uses of the Teaspoon today
- US recipe and cooking measurement for small quantities
- Medication dosing instructions in the US
- Baking measurement alongside the tablespoon and cup
Teaspoon — sources
- NIST Handbook 44, Appendix C — General tables of units including the US teaspoon definition.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many teaspoons are in 1 femtoliter?
1 femtoliter equals 2.028841e-13 teaspoons, using the exact defined conversion factor rather than an estimate.
How do I convert femtoliter to teaspoon?
Multiply the femtoliter value by 2.028841e-13. The converter above does this instantly to whatever precision you set.
How do I convert teaspoon back to femtoliter?
Use the reverse factor: 1 teaspoon equals 4.928922e+12 femtoliters. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtoliter?
Femtoliter (fL) is a unit of volume.
What is a teaspoon?
Teaspoon (tsp) measures volume. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. It is classified as a US customary unit.
Is the femtoliter to teaspoon conversion exact?
Yes. The US teaspoon is exactly 4.92892159375 milliliters — 1/3 of a US tablespoon and 1/48 of a US cup. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.