Teaspoons to Milliliters Converter
Convert between teaspoons and milliliters for precise recipe measurements. Enter values for instant results with step-by-step formulas.
Formula
Milliliters = Teaspoons x 4.92892
One US teaspoon equals 4.92892 milliliters (commonly rounded to 5 mL). One teaspoon equals 1/3 tablespoon, 1/6 fluid ounce, and 1/48 cup. The metric teaspoon is defined as exactly 5 mL. For medical dosing, the 5 mL standard is universally used.
Worked Examples
Example 1: Medicine Dosing Conversion
Problem: A liquid medicine label says to take 2 teaspoons. How many milliliters should be measured with a dosing syringe?
Solution: Medical standard: 1 teaspoon = 5 mL\n2 teaspoons = 2 x 5 = 10 mL\nPrecise calculation: 2 x 4.929 = 9.858 mL\nMedical practice uses the 5 mL standard, so 10 mL is correct.\nAlways use a calibrated dosing syringe, not a household spoon.
Result: 2 teaspoons = 10 mL (medical standard) | 9.86 mL (precise)
Example 2: Scaling a Baking Recipe
Problem: A recipe calls for 1.5 teaspoons of vanilla extract. You want to triple the batch. What is the total in milliliters?
Solution: 1.5 teaspoons x 3 = 4.5 teaspoons\n4.5 teaspoons x 4.929 mL = 22.18 mL\nAlternatively: 4.5 teaspoons = 1.5 tablespoons\n4.5 teaspoons = 22.18 mL (approximately 22 mL)\nThis equals about 0.75 fluid ounces.
Result: 4.5 teaspoons = 22.2 mL = 1.5 tablespoons = 0.75 fl oz
Frequently Asked Questions
How many milliliters are in a teaspoon?
One US teaspoon contains exactly 4.92892 milliliters, which is commonly rounded to 5 mL for practical cooking and medical purposes. This rounding to 5 mL is universally accepted in medicine and pharmacology, where dosing syringes and medicine cups mark 5 mL as one teaspoon. For cooking, the difference between 4.93 mL and 5 mL is negligible and will not affect recipe outcomes. However, the precise conversion matters in laboratory and scientific applications where accuracy is critical. The metric teaspoon used in some countries is defined as exactly 5 mL, eliminating any confusion. When following recipes or medical instructions, using the 5 mL approximation is perfectly acceptable.
How do I convert teaspoons to milliliters for medicine dosing?
For medicine dosing, one teaspoon is standardized to 5 milliliters by the medical community. A half teaspoon equals 2.5 mL, and one tablespoon (3 teaspoons) equals 15 mL. However, medical professionals strongly recommend using a calibrated oral syringe or medicine cup with milliliter markings rather than household teaspoons. Studies have shown that household teaspoons vary widely in volume, from 2.5 to 7.3 mL, making them dangerously inaccurate for medication dosing. The American Academy of Pediatrics recommends that all liquid medications be dosed in milliliters using a proper measuring device. Over-the-counter cough syrups and fever reducers typically include a dosing cup or syringe for this reason.
How many teaspoons are in a tablespoon and a cup?
There are exactly 3 teaspoons in 1 tablespoon and 48 teaspoons in 1 US cup. These relationships form the foundation of kitchen measurement conversions. Working from the teaspoon: 3 teaspoons make 1 tablespoon, 6 teaspoons make 2 tablespoons (1 fluid ounce), 12 teaspoons make 4 tablespoons (1/4 cup), 24 teaspoons make 8 tablespoons (1/2 cup), 36 teaspoons make 12 tablespoons (3/4 cup), and 48 teaspoons make 16 tablespoons (1 full cup). Memorizing the 3-teaspoons-per-tablespoon relationship is the most useful since small quantity measurements in recipes frequently switch between teaspoons and tablespoons. For instance, 1.5 teaspoons can be written as half a tablespoon.
How do I convert between teaspoons and milliliters when cooking with international recipes?
When working with international recipes, the safest approach is to treat one teaspoon as 5 mL since most countries either use the metric 5 mL teaspoon or their local teaspoon is close enough that the difference is negligible for cooking. Multiply teaspoons by 5 for a quick milliliter conversion, or divide milliliters by 5 to get teaspoons. For example, a Japanese recipe calling for 10 mL of soy sauce equals 2 teaspoons. A French recipe specifying 15 mL of cream equals 3 teaspoons or 1 tablespoon. If extreme precision is needed, use 4.93 mL per US teaspoon instead of the rounded 5 mL. A graduated measuring cup with milliliter markings eliminates conversion math entirely and is indispensable for anyone who regularly cooks from international recipes.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.