How to use this calculator
- Enter constant borrowed balance, annual simple rate (%), days borrowed, day-count denominator.
- Choose a display currency, then select Calculate. Results also update after a brief pause while you edit.
- Read the result with the assumptions below. Export details or save a second scenario to compare your choices.
Formula and method
Interest=borrowed balance×annual rate×days/day-count denominator.
Assumptions and limitations
Real brokers may tier balances, vary rates or accrue interest daily; no compounding or rate quotes supplied.
Worked example
With constant borrowed balance = 10000, annual simple rate (%) = 12, days borrowed = 30, day-count denominator = 365, accrued simple interest is approximately 98.630137.
What the result means
Estimate financing cost for a constant balance and rate.
Common questions
How should I interpret accrued simple interest?
Estimate financing cost for a constant balance and rate.
What should I check before using this result?
Real brokers may tier balances, vary rates or accrue interest daily; no compounding or rate quotes supplied.
Methodology and transparency
Calculation specification reviewed on 2026-10-14. Mathematical implementation is tested against independent reference fixtures. This does not imply review by a licensed financial professional. Read the testing and precision policy.