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
Each month applies the rate selected by the exact opening balance, adds the end-of-month deposit, then deducts the entered fee only up to the available modeled balance.
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
Starting with 10,000, depositing 200 monthly for 24 months, earning 4.8% above a 5,000 minimum and 1% below it, with no fee, ends at approximately 16,032.90.
Each month applies the rate selected by the exact opening balance, adds the end-of-month deposit, then deducts the entered fee only up to the available modeled balance.
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
The qualifying rate is selected from each month's exact opening balance. Deposits are added and fees deducted at month-end. The balance never goes below zero; unpaid or externally collected fees are not modeled. Product access and transaction rules vary and are not inferred.