15 TBSP to TSP – Full Calculation Guide

15 tablespoons (tbsp) is equal to 45 teaspoons (tsp).

Since 1 tablespoon equals 3 teaspoons, multiplying 15 by 3 gives the total teaspoons. Therefore, 15 tbsp × 3 = 45 tsp.

Conversion Tool

Conversion Formula

To convert tablespoons (tbsp) to teaspoons (tsp), multiply the number of tablespoons by 3. This because 1 tablespoon contains exactly 3 teaspoons. The formula is:

tsp = tbsp × 3

For example, converting 15 tbsp to tsp:

• Start with 15 tbsp
• Multiply by 3 (since 1 tbsp = 3 tsp)
• 15 × 3 = 45 tsp

This formula works because the teaspoon is a smaller unit, so it takes three teaspoons to equal one tablespoon.

Conversion Example

• 7 tbsp to tsp:
  • Multiply 7 by 3
  • 7 × 3 = 21 tsp
  • Result: 7 tbsp equals 21 teaspoons
• 2.5 tbsp to tsp:
  • Multiply 2.5 by 3
  • 2.5 × 3 = 7.5 tsp
  • Result: 2.5 tbsp equals 7.5 teaspoons
• 0.75 tbsp to tsp:
  • Multiply 0.75 by 3
  • 0.75 × 3 = 2.25 tsp
  • Result: 0.75 tbsp equals 2.25 teaspoons
• 12 tbsp to tsp:
  • Multiply 12 by 3
  • 12 × 3 = 36 tsp
  • Result: 12 tbsp equals 36 teaspoons

Conversion Chart

The chart below shows conversions for values from -10.0 to 40.0 tablespoons into teaspoons. To find the tsp value, just look for the tbsp in the left column and read across to see the equivalent tsp value.

Related Conversion Questions

• How many teaspoons are in 15 tablespoons exactly?
• What is the tsp equivalent for 15 tbsp in baking recipes?
• Converting 15 tbsp to tsp, will it affect the taste?
• Is 15 tablespoons equal to 45 teaspoons in volume?
• How do I convert 15 tbsp into teaspoons quickly?
• Are 15 tbsp and 45 tsp the same measurement for cooking?
• What is the best way to measure 15 tablespoons in teaspoons?

Conversion Definitions

tbsp (Tablespoon): A tablespoon is a unit of volume used in cooking, commonly abbreviated as tbsp. It is equal to three teaspoons or 15 milliliters in the metric system. Tablespoons are frequently used to measure ingredients like liquids, spices, or baking components.

tsp (Teaspoon): A teaspoon is a smaller volume unit, abbreviated as tsp, often used in cooking and medicine. One teaspoon equals one-third of a tablespoon or approximately 5 milliliters. It is useful for measuring smaller quantities of ingredients accurately.

Conversion FAQs

Can I convert tablespoons to teaspoons for any ingredient without changing the quantity?

Yes, because tablespoons and teaspoons are volume measurements, converting 15 tbsp to tsp keeps the amount consistent in volume. However, ingredient density might vary, so weight conversions may differ. For liquids and powders, the tsp equivalent works well.

Why does the conversion multiply tablespoons by exactly 3?

This is because 1 tablespoon equals 3 teaspoons by definition in cooking measurements. This fixed ratio makes conversions straightforward, avoiding any approximation errors when changing between these units.

Is it okay to use the same conversion in all countries?

Mostly yes, but some countries use slightly different tablespoon sizes (like Australia vs the US). The US tablespoon equals 15 ml, while others might differ slightly, so the tsp conversion could vary by a small margin in those cases.

Can I use this conversion for dry ingredients?

The conversion applies volume-wise, so for dry ingredients, it works if measuring by volume. But dry ingredients density will affect weight, so if a recipe needs weight precision, converting tbsp to tsp by volume only might not be exact.

What if I only have teaspoons available and need tablespoons?

To convert teaspoons to tablespoons, divide the number of teaspoons by 3. For example, 45 tsp ÷ 3 = 15 tbsp, which is the reverse of the conversion shown here.

Last Updated : 03 July, 2025

Sandeep Bhandari

Sandeep Bhandari holds a Bachelor of Engineering in Computers from Thapar University (2006). He has 20 years of experience in the technology field. He has a keen interest in various technical fields, including database systems, computer networks, and programming. You can read more about him on his bio page.