1.5 TBSP to TSP – Answer with Formula

1.5 tablespoons (tbsp) is equal to 4.5 teaspoons (tsp).

This conversion is based on the fact that 1 tablespoon equals 3 teaspoons. Therefore, multiplying 1.5 by 3 gives the total teaspoons.

Conversion Tool

Conversion Formula

The formula to convert tablespoons to teaspoons is:
tsp = tbsp × 3.

This works because each tablespoon is equal to exactly 3 teaspoons by volume. When you multiply the number of tablespoons by 3, you get the equivalent amount in teaspoons.

For example, to convert 1.5 tbsp to tsp:

• Identify the conversion factor: 1 tbsp = 3 tsp
• Multiply 1.5 by 3: 1.5 × 3 = 4.5
• The result is 4.5 teaspoons.

Conversion Example

• Convert 2 tbsp to tsp:
  • Multiply 2 by 3.
  • 2 × 3 = 6 tsp.
  • So, 2 tablespoons equals 6 teaspoons.
• Convert 0.75 tbsp to tsp:
  • Multiply 0.75 by 3.
  • 0.75 × 3 = 2.25 tsp.
  • Therefore, 0.75 tablespoons equals 2.25 teaspoons.
• Convert 3.2 tbsp to tsp:
  • Multiply 3.2 by 3.
  • 3.2 × 3 = 9.6 tsp.
  • So 3.2 tablespoons equals 9.6 teaspoons.
• Convert 5 tbsp to tsp:
  • Multiply 5 by 3.
  • 5 × 3 = 15 tsp.
  • Therefore, 5 tablespoons equals 15 teaspoons.

Conversion Chart

This chart shows tablespoons in the left column and their equivalent teaspoons on the right. You can quickly find the tsp amount by multiplying the tbsp value by 3, as shown in the table.

Related Conversion Questions

• How many teaspoons are in 1.5 tablespoons?
• What does 1.5 tbsp equal in teaspoons?
• Convert 1.5 tbsp to tsp accurately.
• Is 1.5 tablespoons more than 4 teaspoons?
• How to change 1.5 tbsp into teaspoons for cooking?
• What’s the tsp equivalent for 1.5 tbsp measurement?
• If a recipe needs 1.5 tbsp, how many teaspoons should I use?

Conversion Definitions

tbsp (tablespoon): A tablespoon is a cooking measure commonly used in the US and UK, equal to 3 teaspoons, or about 14.79 milliliters. It is used to measure liquid or dry ingredients, providing a standardized unit for recipes and food preparation.

tsp (teaspoon): A teaspoon is a smaller unit of volume measure used in cooking, equal to one-third of a tablespoon or approximately 4.93 milliliters. It measures both liquid and dry ingredients, widely used in culinary instructions and medicine dosing.

Conversion FAQs

Can I use tablespoons instead of teaspoons in recipes?

Substituting tablespoons for teaspoons without adjusting the quantity will affect the recipe’s outcome. Since 1 tablespoon equals 3 teaspoons, using tablespoons in place of teaspoons without multiplying by 3 will result in too much of the ingredient.

Why is the tablespoon to teaspoon conversion factor always 3?

The conversion factor is based on the standard volume sizes set in cooking measurements. Because a tablespoon holds three times the volume of a teaspoon, the conversion factor remains constant regardless of the ingredient being measured.

Are tablespoon and tablespoon volume same worldwide?

Tablespoon sizes vary slightly in different countries—for example, the US tablespoon is about 14.79 ml, while the UK uses 15 ml. However, the conversion factor to teaspoons stays consistent within each system, so the 3:1 ratio applies within those contexts.

Does ingredient density affect tbsp to tsp conversion?

No, the tablespoon to teaspoon conversion is based on volume, not weight or density. So, whether measuring sugar or oil, 1 tablespoon will always be 3 teaspoons, although the actual weight may differ.

How accurate is using this conversion in baking?

Using the 3:1 ratio for tbsp to tsp is accurate enough for most baking purposes. However, precise baking may require weighing ingredients because volume measurements can vary with ingredient packing.

Last Updated : 02 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.