Deposit Interest Calculator
Calculate deposit interest and maturity value using simple interest or daily compounding over an exact date range.
Deposit Interest Calculator
- Enter the principal (or target maturity amount), annual interest rate, and exact deposit and withdrawal dates.
- Choose simple interest for a linear calculation or daily compounding when interest is added to the balance each day.
- Use reverse calculation to estimate the principal required to reach a target maturity value.
- Calculations use a 365-day year and are estimates for planning, not financial advice.
ABOUT THIS TOOL
Deposit Interest Calculator
Estimate deposit interest or reverse-calculate the required principal from an annual rate and exact date range. Results use disclosed day-count assumptions.
How to use this tool
- Choose final-value or principal mode.
- Enter the amount, dates and annual rate.
- Review principal, interest and final value.
Examples
- Estimate simple interest for a 90-day deposit.
- Find the principal required to reach a target final balance.
Frequently asked questions
Will this match a bank statement exactly?
Not always. Banks can use different day-count rules, compounding, tax, fees and product-specific conditions.