Jimmie's Calculations

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Calculators

Payments, growth, and shorter formulas for interest, doubling time, present value, and return.

A fixed-rate loan repays borrowed money in equal monthly payments; over time, more of each payment goes toward principal and less toward interest.

Compound interest grows your balance by applying the return to both your starting amount and interest you have already earned.

A retirement projection estimates how much you could have saved by a target date from what you have today plus regular monthly contributions.

A savings goal shows how long it takes to reach a target balance from your current savings and monthly contributions at an assumed return.

Simple interest charges or earns a rate only on the original principal, not on interest already added.

The Rule of 72 estimates how many years it takes for an amount to double at a fixed annual rate.

Present value is what a future amount of money is worth today after discounting at an annual rate.

Return on investment compares the gain or loss with the amount you put in, shown as a percent.

Equations for every formula, including ones that do not have a calculator.

Equations for every formula, including ones that do not have a calculator.