Missing Variable Calculator

Solve the annuity equation for the unknown: PMT, Principal, Rate, or Term.

Solve For

Principal ($)

Annual Rate (%)

Term (years)

Payment ($/mo)

Result

Enter known values and click Solve.

PMT = P r (1+r)^n / ((1+r)^n − 1), with monthly r = APR/12 and n = months.

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