21 milliliters to US teaspoons
4.26 tsp
21 mL = 4.26 tsp.
US teaspoons
4.26tsp
21 mL = 4.26 tsp
In short
How many US teaspoons is 21 milliliters?
21 mL = 4.26 tsp. 1 milliliter = 0.202884 US teaspoons, so the working is 21 × 0.202884 = 4.26.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 milliliter = 0.202884 US teaspoons 21 × 0.202884 = 4.26
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (tsp) | Off by |
|---|---|---|
| Whole number | 4 | −0.26057 |
| 1 decimal | 4.3 | +0.03943 |
| 2 decimals | 4.26 | −0.00057 |
Round trip: take 4.26 tsp back the other way and you land on 20.9972 mL — a drift of 0.0028 mL. That gap is the rounding, not the conversion.
Frequently asked questions
What is 21 milliliters in US teaspoons?
21 milliliters is 4.26 US teaspoons. 1 milliliter = 0.202884 US teaspoons, so the working is 21 × 0.202884 = 4.26.
How accurate is 4.26 tsp?
Rounding to 4.26 tsp and converting straight back gives 20.9972 mL, a drift of 0.0028 mL from the 21 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
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Milliliters to Teaspoons Converter
Convert milliliters to US teaspoons — for a metric label measured with American spoons.
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