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Daily Compound Interest Calculator

Enter the principal, annual rate, and years to find the daily-compounded growth.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Daily compounding calculates interest on a balance every single day rather than monthly, quarterly, or annually, with each day’s interest added to the principal so the next day’s interest is earned on a slightly larger base. The formula is A = P(1 + r/365)^(365×t), where P is the principal, r is the annual interest rate, and t is the time in years — 365 replaces the usual compounding-periods-per-year figure used for other frequencies.

Because interest gets added to the balance more frequently, daily compounding produces a very slightly higher effective return than the same nominal rate compounded monthly or annually — the difference is small but real, and it’s why the Annual Percentage Yield (APY) disclosed by high-yield savings accounts and some credit card issuers is calculated after accounting for compounding frequency, not just the stated nominal rate.

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