Fixed-rate loan payment calculator
Estimate installment payment and total interest.
Your inputs
Your results
Ready when you areYour results will appear here.
Compare two scenarios.
Run the tool, then save A or B to compare headline results and entered values. Keep currencies, periods and assumptions consistent.
Saved scenarios stay in this browser until you clear them. Reset clears the working result; it keeps saved scenarios. Use Clear saved scenarios on a shared device.
Run the tool to save your first scenario.
How it works
Calculate a fixed monthly installment and cent-rounded amortization schedule using a nominal annual rate divided by twelve. Payments occur at month end.
Read the source reference ↗A few things to know
Excludes fees, insurance, taxes, daily accrual and variable rates. Monthly interest is rounded to cents; the regular installment is rounded up to a cent. Actual lender conventions can differ.
Results use your inputs. Keep all money amounts in the same currency.
When to use this tool
Separate principal repayment from interest in a fixed-rate installment scenario. A schedule makes the changing interest share visible.
- Estimate an installment.
- Inspect principal and interest.
- Compare loan terms.
How to use fixed-rate loan payment calculator
Prepare the inputs
Use balances and rates from current statements, in one currency.
Choose the settings
Enter the scenario assumptions; this tool does not fetch market rates.
Review and export
Compare the report with the actual account terms before acting.
Try the supplied example
Inputs
principal: 10000; rate: 6; years: 3
Result
A 10,000 balance at 6% over 36 months has a regular payment of 304.22, with a reduced final installment.
What it means
Compare with your lender’s daily or monthly accrual convention.
Common mistakes to avoid
Do not confuse APR including fees with a note interest rate
Do not confuse APR including fees with a note interest rate.
The lender may accrue interest daily
The lender may accrue interest daily.
Frequently asked questions
Definitions, edge cases, and practical next steps for this tool. Search all tool FAQs ↗
Which rate convention is used?
A nominal annual interest rate divided by 12.
What happens at zero interest?
Principal is divided across the term, with cent rounding and a reduced final payment.
Are fees included?
No. Entered principal and interest are the only loan amounts modeled.
When are payments made?
At the end of each modeled month.
Why can the final payment differ?
It is capped at the remaining principal plus that month’s interest.
Is this a lender quote?
No. Actual contracts, accrual rules and fees control the real payment.
Are my inputs uploaded or stored?
Processing happens locally in your browser. This tool does not upload inputs. Downloads stay on your device; sharing or opening them in another service is your choice.
What should I check before using the output?
Excludes fees, insurance, taxes, daily accrual and variable rates. Monthly interest is rounded to cents; the regular installment is rounded up to a cent. Actual lender conventions can differ.
Explore the topic in the blog
Sources and method
Use the references below to check definitions and platform guidance. The model’s scope and limits are explained above. Read our editorial standards.