1 US teaspoons to milliliters
4.93 mL
1 tsp = 4.93 mL.
milliliters
4.93mL
1 tsp = 4.93 mL
In short
How many milliliters is 1 US teaspoons?
1 tsp = 4.93 mL. 1 US teaspoon = 4.928922 milliliters, so the working is 1 × 4.928922 = 4.93.
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 US teaspoon = 4.928922 milliliters 1 × 4.928922 = 4.93
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 (mL) | Off by |
|---|---|---|
| Whole number | 5 | +0.07108 |
| 1 decimal | 4.9 | −0.02892 |
| 2 decimals | 4.93 | +0.00108 |
Round trip: take 4.93 mL back the other way and you land on 1.0002 tsp — a drift of 0.0002 tsp. That gap is the rounding, not the conversion.
What 1 tsp looks like
1 tsp
One US teaspoon is 4.93 millilitres, close enough to the metric 5 mL to substitute.
Frequently asked questions
What is 1 US teaspoons in milliliters?
1 US teaspoons is 4.93 milliliters. 1 US teaspoon = 4.928922 milliliters, so the working is 1 × 4.928922 = 4.93.
How accurate is 4.93 mL?
Rounding to 4.93 mL and converting straight back gives 1.0002 tsp, a drift of 0.0002 tsp from the 1 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
Teaspoons to Milliliters Converter
Convert US teaspoons to milliliters — and why a medicine spoon is 5 mL, not 4.93.
Open the teaspoons to milliliters converter →