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Interest 4

Four in one calculator

  • simple interest
  • compounding interest
  • equal total payments per time period (straight line)
  • equal principal payments per time period

This calculator shows real cost of lending, without any bank fees, insurances etc.

It supports full range of repayment or compounding periods: daily, weekly, fortnightly, monthly quarterly, semi annually, annually.

It is easy to see how the calculated values are changed when changing other values or changing the calculation type. Each calculation type has its own color to avoid misleading similarity of input values.

Simple interest
Compound interest
Equal total
Equal principal

Simply swipe to change calculation type

Amortization table


Simple interest

is called simple because it ignores the effects of compounding. The interest charge is always based on the original principal, so interest on interest is not included.

Compound interest

calculated on the initial principal and also on the accumulated interest of previous periods of a deposit or loan. Compound interest can be thought of as “interest on interest,” and will make a deposit or loan grow at a faster rate than simple interest, which is interest calculated only on the principal amount. The rate at which compound interest accrues depends on the frequency of compounding; the higher the number of compounding periods, the greater the compound interest.

Equal principal payment

plan also provides for payment of accrued interest on the unpaid balance, plus an equal amount of the principal. The total payment declines over time. As the remaining principal balance declines, the amount of interest accrued also declines.

Equal total payment

method is used, when each payment includes the accrued interest on the unpaid balance, plus some principal, so that periodical payments are equal. The amount applied toward the principal increases with each payment.