General-purpose calculator for core personal finance and time-value problems.
Overview
Many financial decisions rely on the same time-value relationships even when product labels differ. Loans, savings plans, and investment goals can often be framed as payment, rate, or value problems.
This calculator provides a flexible way to solve for unknown variables such as payment amount, term, future value, and present value. It is useful when comparing alternatives quickly.
Financial outcomes depend on assumptions, so run multiple scenarios and treat any single output as one possible path rather than a guaranteed result.
Steps
Choose payment, rate, term, PV, or FV objective.
Provide the values required by the selected mode.
Match frequency assumptions across all inputs.
Add costs when comparing real-world options.
Solve the unknown variable from your inputs.
Test how outputs change under different assumptions.
Math
Core TVM relationships: FV = PV(1+r)^n and PMT-based annuity equations
The calculator applies standard time-value formulas that link principal, periodic rate, number of periods, and recurring payments to solve the variable you select.
Worked cases
Use amortization PMT formula
Returns estimated monthly payment and total paid.
Combine lump-sum growth and annuity growth terms
Shows projected account value at chosen horizon.
Iterate rate that satisfies target equation
Estimates implied return needed to meet the goal.
Why use this
Questions