A US teaspoon is a customary volume unit equal to 4.92892159375 milliliters, commonly used in recipes.
Teaspoon to Metric teaspoon
Convert Teaspoon to Metric teaspoon instantly. Free online cooking unit converter with exact formula, conversion table and FAQ.
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Convert cooking volume and mass units used in recipes and nutrition workflows.
Context values
Some unit families need one extra value for a physically accurate result.
A metric teaspoon is defined as exactly 5 milliliters.
metric tsp = tsp × 0.9857843187
Results update instantly for Teaspoon to Metric teaspoon conversions.
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Formula
metric tsp = tsp × 0.9857843187
tsp = metric tsp × 1.014420681
Conversion table
| 1 tsp | 0.985784 metric tsp |
| 5 tsp | 4.928922 metric tsp |
| 10 tsp | 9.857843 metric tsp |
| 20 tsp | 19.715686 metric tsp |
| 50 tsp | 49.289216 metric tsp |
| 100 tsp | 98.578432 metric tsp |
| 500 tsp | 492.892159 metric tsp |
| 1000 tsp | 985.784319 metric tsp |
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Frequently asked questions
What is the source unit in this conversion?
The source unit is the teaspoon (tsp). A US teaspoon is a customary volume unit equal to 4.92892159375 milliliters, commonly used in recipes.
What is the destination unit in this conversion?
The destination unit is the metric teaspoon (metric tsp). A metric teaspoon is defined as exactly 5 milliliters.
How do I convert teaspoon to metric teaspoon?
Multiply the teaspoon value by 0.9857843187. For example, 10 tsp × 0.9857843187 = 9.857843 metric tsp.
Is the teaspoon to metric teaspoon conversion exact?
Yes. This conversion uses a fixed factor defined for cooking measurement standards, so results are consistent every time.
Where is this conversion commonly used?
It's used when following recipes, adjusting ingredient quantities, or converting between US customary and metric cooking measurements.
Can I convert metric teaspoon back to teaspoon?
Yes. Multiply the metric teaspoon value by 1.014420681 to get teaspoon.
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About this conversion
This page converts teaspoon (tsp) to metric teaspoon (metric tsp) within the cooking converter.
A US teaspoon is a customary volume unit equal to 4.92892159375 milliliters, commonly used in recipes. A metric teaspoon is defined as exactly 5 milliliters.
The formula is metric tsp = tsp × 0.9857843187, based on each unit's fixed relationship to the cooking converter's reference units.
Results are consistent because the conversion relies on a fixed numerical ratio rather than an estimate.
Use the calculator above for instant results, or the table below for common teaspoon values already converted to metric teaspoon.