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Cooking conversion
Teaspoons of Water to Ounces
How many ounces are in teaspoons of water? Type a value below to see the result instantly. Cooking conversions depend on the density of each ingredient — the math here uses 1.000 g/mL for water.
Calculator
1 tsp of water = 0.173863 oz
Teaspoons of Water to Ounces Conversion Table
Common values for water:
| Teaspoons of water | Ounces |
|---|---|
| 0.25 tsp | 0.043466 oz |
| 0.5 tsp | 0.086931 oz |
| 1 tsp | 0.173863 oz |
| 2 tsp | 0.347725 oz |
| 3 tsp | 0.521588 oz |
| 4 tsp | 0.69545 oz |
| 5 tsp | 0.869313 oz |
| 8 tsp | 1.3909 oz |
| 10 tsp | 1.7386 oz |
How this works
Water has a density of about 1.000 g/mL (si definition). That means 1 mL of water weighs 1.000 grams.
Ounces = teaspoons × 0.1739
Note: By definition at 4°C. Within 0.5% across cooking temperatures.
Why a cup of water doesn't always weigh the same
Volume measurements are forgiving in some ways and brutal in others. A cup of water can vary by 10-20% in weight depending on how it's measured: spooned vs scooped, packed vs loose, sifted vs unsifted. The density figure used here (1.000 g/mL) matches the most common published recipe conventions, but if you're after baking precision, weighing on a kitchen scale is more accurate than measuring by volume.
Sourced from SI definition. By definition at 4°C. Within 0.5% across cooking temperatures.
Volume vs weight in cooking
The American convention of measuring ingredients by volume (cups, tablespoons, teaspoons) is convenient but introduces variability that doesn't exist in weight-based recipes. Most professional bakers and bakeries weigh ingredients to within a gram because the structure of baked goods depends on precise ingredient ratios. For everyday cooking — soups, sauces, sautés — the volume-to-weight imprecision rarely matters. For baking that depends on rising or texture (cakes, breads, laminated doughs), it matters a lot.
The conversion
Multiplying the volume of water by its density (1.000 g/mL) gives the weight in grams. The calculator at the top of this page does the math automatically; the formula box above shows the resulting linear factor for the specific volume and weight units selected here.