Money Tools

Interest-Only Payment Calculator

Estimate an interest-only monthly payment and optionally compare it with a standard amortized loan payment.

Updated April 12, 2026
Free online tool
Planning and research use

Why this page exists

Loan payments are easier to compare when the interest-only portion is separated from a normal amortized payment instead of blended into one vague financing idea. This calculator helps visitors estimate a monthly interest-only payment and, if they want, compare it with a standard amortized payment using a chosen loan term.

Interactive tool

Run the estimate

Enter your numbers and read the result first, then use the sections below to understand what affects the outcome.

Calculator

Interest-only payment calculator

Estimate a monthly interest-only payment and optionally compare it with a standard amortized payment.

Result

$1,510.42

Estimated monthly interest-only payment with an optional comparison to a standard fully amortized payment.

Interest-only monthly payment$1,510.42

Standard amortized payment$1,705.44

Monthly payment difference$195.02

Interest-only period total$90,625.00

$250,000 at 7.25% gives an interest-only payment of about $1,510.42 per month.
Using 360 months for a standard amortized comparison points to about $1,705.44 per month, a difference of $195.02 from the interest-only payment.
Over 5 years, the interest-only payments would total about $90,625.00 without reducing principal in this simple estimate.

This is a planning estimate only. Real loans can include fees, changing rates, balloon payments, and lender-specific rules that change both the interest-only payment and any amortized comparison.

Planning note

Last updated April 12, 2026. Use this tool to compare scenarios and plan ahead, then confirm important details with the lender, employer, insurer, contractor, or other qualified provider involved in the final decision.

How it works

What the calculator is doing

Enter loan amount and annual interest rate to estimate the monthly interest-only payment.

If you want a comparison, add a loan term in months to estimate what a standard amortized payment would look like.

You can also enter an interest-only period to see how much those interest-only payments would total over that span.

Understanding your result

Interest-only means the payment shown here covers interest only and does not reduce principal unless extra principal is paid separately. This is a planning estimate, so real loans can still differ because of fees, changing rates, or lender-specific repayment rules.

Browse more money tools

Examples

Ways people use this tool

Example scenarios help turn a quick estimate into a more useful comparison or planning step.

Compare interest-only and amortized monthly payments

A side-by-side estimate can make it easier to see why the interest-only payment is usually lower at first.

Estimate the cost of an interest-only period

Adding the period length helps show how much those interest-only payments may total before principal reduction begins.

Use the payment as a budgeting screen

A quick estimate can help show whether a financing idea is worth reviewing more deeply.

FAQ

Common questions

How is an interest-only payment calculated?

The calculator multiplies the loan amount by the annual interest rate and divides by 12 to estimate the monthly interest-only payment.

Why is the interest-only payment usually lower than an amortized payment?

Because the interest-only payment covers interest only, while an amortized payment includes both interest and principal repayment.

Does an interest-only payment reduce the balance?

Not by itself. In a true interest-only structure, the regular payment covers interest and the principal stays the same unless extra principal is paid separately.

Related tools

Keep comparing

Use these related tools to compare nearby scenarios, check a second estimate, or keep narrowing down the right decision.

Money ToolsUpdated April 11, 2026