Compound Daily Interest Calculator

What is Daily Compound Interest?

Daily compound interest is a method of interest calculation where interest is calculated and added to the principal balance every day. This means that each day, your interest earns interest on top of itself, creating a faster growth trajectory compared to monthly or annual compounding. Whether you are calculating the growth of a savings account, a certificate of deposit (CD), or assessing the cost of a loan, understanding daily compounding helps you make more informed financial decisions.

The Daily Compounding Formula

The standard formula for calculating daily compound interest is:

Where:

• $A$ is the future value of the investment or loan, including interest.
• $P$ is the principal investment amount (initial deposit).
• $r$ is the annual interest rate (decimal form).
• $t$ is the time the money is invested or borrowed for, in years.

If you make regular daily, weekly, or monthly contributions, the calculation dynamically accumulates the interest day-by-day to provide an exact projection of your final balance.

How Daily Compounding Compares to Other Frequencies

Because interest is added more frequently, daily compounding yields slightly higher returns than other frequencies. For instance, an initial $10,000 investment at a 6% annual rate over 10 years grows to:

• Annual Compounding: $17,908.48
• Monthly Compounding: $18,193.97
• Daily Compounding: $18,220.30

To compare different financial growth scenarios, check out our Compound Interest Calculator, APY Calculator, or Savings Calculator.