Compounding comparison

Monthly vs daily compounding

Daily compounding gives interest more chances to earn interest, but the difference can be modest. Use the full calculator to compare monthly and daily results with the same starting amount, deposits, rate, and years.

Monthly compounding

A = P(1 + r / 12) ^ (12t)

Monthly compounding is common for planning examples and recurring contribution schedules.

Daily compounding

A = P(1 + r / 365) ^ (365t)

Daily compounding is common for bank interest and money market examples, especially when APY is advertised.

Decision checklist

Compare the whole account, not only the formula.

APY

APY already includes compounding, which makes it the cleaner headline comparison.

Deposit schedule

Monthly deposits, one-time deposits, and irregular deposits can produce different curves.

Fees and rules

Fees, minimum balances, and withdrawal restrictions can erase a small compounding advantage.