The Beauty Calculator works by taking input values related to a beauty product and using those inputs to perform calculations that provide insights into the usage and longevity of the product. Here’s how it works step by step:

1. User Input:

   • The user selects the type of beauty product from a dropdown list (e.g., mascara, nail polish).
   • The user enters the efficiency percentage, which represents the effectiveness of the product.
   • The user inputs the product volume in milliliters.
   • The user specifies the number of layers per application.
   • The user indicates the number of applications per day.

2. Calculation of Total Number of Applications (N):

   • The Beauty Calculator applies the formula: =efficiency×product Volume/layersPerApplication​
   • This calculation determines the total number of applications the user can expect to get from the beauty product based on the entered efficiency, product volume, and layers per application.

3. Calculation of Estimated Number of Days Until Product Runs Out:

   • The Beauty Calculator then uses the total number of applications (N) to estimate the number of days until the product runs out.
   • The formula used is: days=N/applications Per Day​
   • This calculation provides an estimate of how many days the user can use the product before it is expected to be depleted.

4. Displaying Results:

   • The Beauty Calculator displays the calculated results on the web page.
   • The output includes the total number of applications and an estimate of the number of days until the product runs out.
   • The results are formatted and presented for the user to understand the usage patterns and longevity of the selected beauty product.

5. User Feedback:

   • The user can review the results and use the information to plan or understand how long the beauty product is likely to last based on their specified usage parameters.