A US teaspoon is one third of a US tablespoon.
Teaspoons to Femtoliters Converter — tsp to fL
Convert Teaspoon (tsp) to Femtoliter (fL) using the exact conversion factor (1 teaspoon = 4.928922e+12 femtoliter). See the formula, worked examples, conversion table, and common uses.
Teaspoons to Femtoliters 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.
Femtoliter is 1e-15 liter units.
Result = input x 4.92892159e-6 / 1e-18.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Teaspoons to Femtoliters
Teaspoon and Femtoliter 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. Teaspoon is most often used for us recipe and cooking measurement for small quantities.
Formula
femtoliters = teaspoons × 4.928922e+12
This factor comes from each unit's defined relationship to the category's base unit: 1 teaspoon equals 0.00000492892159375 base units, and 1 femtoliter equals 1e-18 base units, so dividing one by the other gives the direct teaspoon-to-femtoliter factor of 4.928922e+12.
Simple example
1 tsp × 4.928922e+12 = 4.928922e+12 fL
1 teaspoon = 4.928922e+12 femtoliters.
Real-world example
10 tsp × 4.928922e+12 = 4.928922e+13 fL
10 teaspoons = 4.928922e+13 femtoliters.
Conversion table
| Teaspoon (tsp) | Femtoliter (fL) |
|---|---|
| 1 tsp | 4.928922e+12 fL |
| 5 tsp | 2.464461e+13 fL |
| 10 tsp | 4.928922e+13 fL |
| 25 tsp | 1.23223e+14 fL |
| 50 tsp | 2.464461e+14 fL |
| 100 tsp | 4.928922e+14 fL |
Reverse conversion: Femtoliter to Teaspoon
4.928922e+12 fL × 2.028841e-13 = 1.000000082 tsp
4.928922e+12 femtoliters = 1.000000082 teaspoons.
teaspoons = femtoliters × 2.028841e-13
For a page dedicated to this direction, see Femtoliter to Teaspoon.
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
Understanding the Femtoliter (fL)
Femtoliter is 1e-15 liter units.
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 femtoliters are in 1 teaspoon?
1 teaspoon equals 4.928922e+12 femtoliters, using the exact defined conversion factor rather than an estimate.
How do I convert teaspoon to femtoliter?
Multiply the teaspoon value by 4.928922e+12. The converter above does this instantly to whatever precision you set.
How do I convert femtoliter back to teaspoon?
Use the reverse factor: 1 femtoliter equals 2.028841e-13 teaspoons. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a femtoliter?
Femtoliter (fL) is a unit of volume.
Is the teaspoon to femtoliter 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.
Where is the teaspoon still used today?
United States (cooking and recipe measurement)