Finance

Annuity Payment Calculator

Calculate monthly loan payment, total paid, and interest.

Last validated: 2026-02-14

Annuity Payment Calculator computes periodic payment amount for loans or investments with fixed rate and term. It is useful for budget planning and comparing financing options. The tool shows how term and interest interact with payment burden. Use it to evaluate affordability scenarios.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Loan Inputs

Result

Monthly payment: $1,580.17

Total paid: $568,861.22

Total interest: $318,861.22

Payments: 360 monthly payments

How to use this tool

Enter principal, interest rate, payment frequency, and term.
Run the calculator to compute periodic payment.
Compare alternative terms/rates to choose a preferred plan.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Principal: 250000.0
Annual rate: 6.5
Years: 30.0
Months: 360
Monthly payment: 1580.1700587324133

Expected Outputs

Principal: 250000
Annual rate: 6.5
Years: 30
Months: 360

Interpretation

Principal is 250000.0. Use this as a decision input, not as a standalone conclusion.
Annual rate is 6.5. Use this as a decision input, not as a standalone conclusion.
Years is 30.0. Use this as a decision input, not as a standalone conclusion.
Compare at least one conservative and one aggressive scenario before committing to a target.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Principal

Annual rate

Years

Months

Monthly payment

Scenario B

Principal

Annual rate

Years

Months

Monthly payment

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