Quick guide
How to use this calculator
- Enter the balance, rate, timing, fee, or contribution assumptions named by the fields.
- Use one currency and follow the stated nominal, effective, simple-interest, or compounding convention.
- Review the calculator-specific assumptions before comparing accounts or making a savings decision.
Calculation method
Calculation method
Average daily balance = sum(balance × days held) ÷ cycle days. Interest = average daily balance × annual rate × cycle days ÷ day-count basis.
Entered fixed decimals are parsed exactly. Compound projections use stable exponential forms and preserve zero-rate cases exactly; money rounds only for display and a supported nonzero amount is not replaced by a misleading zero.
Worked example
Worked example
Balances of 1,000 for 10 days and 2,000 for 20 days in a 30-day cycle have an average daily balance of 1,666.67.
Average daily balance = sum(balance × days held) ÷ cycle days. Interest = average daily balance × annual rate × cycle days ÷ day-count basis.
Supported inputs
Precision and limits
Visible input limits
Amounts accept up to 30 digits and 12 decimal places and are capped at 1e12 per input. Rates are capped at 1000%. Most projections are capped at 1,200 months or 100 years; narrower whole-number limits appear in field labels.
International scope
No currency, institution, current market rate, deposit-insurance rule, tax system, regulatory disclosure, or jurisdiction-specific product term is assumed.
Decision boundary
Results are arithmetic scenarios from visitor-entered assumptions, not account quotations, forecasts, tax advice, legal determinations, deposit guarantees, or recommendations.
Calculator-specific assumptions
This is an entered balance-interval model, not a bank statement reproduction. Posting rules, business days, minimum balances, and compounding may differ.