Convert US Teaspoons to Milliliters
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Measurement
About Volume Conversions
Volume trips people up because US customary and imperial units share names but not sizes. A US gallon (3.785 liters) runs about 17% smaller than an imperial gallon (4.546 liters), and the gap carries down into pints, quarts, and fluid ounces. Cooking is where it bites: a British recipe's pint of milk is 568 ml, an American pint only 473 ml. Science sidesteps the mess with metric volume, where 1 mL equals exactly 1 cm³. US and imperial variants stay separate below, with exact conversion chains holding precision across the swap.
Quick Conversions
| Unit Name | Symbol | Per 1 US Teaspoon |
|---|---|---|
| Cubic Centimeter | cm³ | 4.92892 |
| Cubic Foot | ft³ | 0.000174063 |
| Cubic Inch | in³ | 0.300781 |
| Cubic Meter | m³ | 0.00000492892 |
| Imperial Fluid Ounce | imp fl oz | 0.173474 |
| Imperial Gallon | imp gal | 0.00108421 |
| Imperial Pint | imp pt | 0.00867369 |
| Liter | L | 0.00492892 |
| Milliliter | mL | 4.92892 |
| US Cup | US cup | 0.0208333 |
| US Fluid Ounce | US fl oz | 0.166667 |
| US Gallon | US gal | 0.00130208 |
| US Pint | US pt | 0.0104167 |
| US Quart | US qt | 0.00520833 |
| US Tablespoon | US tbsp | 0.333333 |
| US Teaspoon | US tsp | 1 |
Frequently Asked Questions
Why is a US teaspoon 4.93 ml, not 5 ml?
The US teaspoon is defined as exactly 4.92892 ml, one-sixth of a US fluid ounce. Most metric measuring spoon sets round it to 5 ml, which is also the official metric teaspoon used in nutrition labels and pharmacy dosing. The 1.4% difference is invisible in cooking but matters for pediatric liquid medication: always use the marked dosing syringe in ml, never a kitchen teaspoon, where typical pours range from 3 to 7 ml depending on the spoon.
How do I convert US Teaspoons to Milliliters?
To convert US Teaspoons to Milliliters, use the conversion where 1 US Teaspoon (US tsp) = 4.92892 Milliliters (mL). For example, 1 US Teaspoon = 4.92892 Milliliters.
What are common US Teaspoon to Milliliter conversions?
Here are common conversions: 1 US Teaspoons = 4.92892 Milliliters, 5 US Teaspoons = 24.6446 Milliliters, 10 US Teaspoons = 49.2892 Milliliters, 25 US Teaspoons = 123.223 Milliliters, 50 US Teaspoons = 246.446 Milliliters, 100 US Teaspoons = 492.892 Milliliters.
When would I need to convert US Teaspoons to Milliliters?
Volume conversions come up when scaling recipes between metric (milliliters, liters) and US customary units (cups, fluid ounces), calculating fuel tank capacities across regions, and in chemistry and manufacturing where a precise liquid measurement decides the outcome.
How precise are the conversions?
All conversions use exact factors verified against NIST and ISO standards with up to 10 significant figures of precision. Results are calculated using IEEE 754 double-precision arithmetic, which provides approximately 15-17 significant digits. For temperature and other non-linear conversions, exact formulas are used rather than approximations.