Auto Loan Interest Calculator

Calculate total interest on an auto loan and the savings from extra monthly principal.

Quick answer: Calculate total interest on an auto loan and the savings from extra monthly principal. Enter Auto Loan Amount, APR, Term Months, and Extra Monthly Payment to personalize the estimate. It returns Total Interest, Monthly Payment, and Estimated Months With Extra so you can compare the impact before choosing a next step. Use it to compare payment, APR, total cost, credit impact, and lender or card tradeoffs.

Total Interest

$6,498

Total Interest

$6,498

Monthly Payment

$608

Estimated Months With Extra

55 months

Estimated Interest Saved

$291

Diagnostic

Your headline result is ready above.

Use this number to compare options and decide the next action.

Plan this in Money Map

What to do next

Plan your next move ->

Your action plan

1
Calculate the baseline result with your current numbers
Calculate total interest on an auto loan and the savings from extra monthly principal.
2
Pressure-test one alternate scenario before deciding
Assumptions change the answer, especially when rates, taxes, or timing matter.
3
Save the result to Money Map or use the linked next action
Turn the result into a prioritized action instead of treating it as a one-off number.

Plan your next move

This is an educational estimate, not tax, legal, investment, or lending advice. Tax rules, rates, and eligibility change and depend on your full situation. Confirm with a qualified professional or the provider before acting.

Calculator action path

Turn this result into a decision

Every SwitchWize calculator connects to a product comparison, rate context, guidance, alerts, and Money Map.

Rate authority hub

Compare

You could gain ~$6,498/yr — compare nowMove from calculation to current product options.

Rate Trend

Track personal loansUse market context before you decide when to act.

Guide

Bank Financing vs Dealer Financing: Which Wins on a Car Loan?Bank/credit union preapproval vs dealer financing compared on rate, negotiating power, and markup risk. See which financing path actually saves you more.

Money Map

Map this $6,498/yr opportunitySave this opportunity and see how it fits your broader money plan.

Alert

Create a rate alertWatch the market instead of checking manually.

Top auto loan rates

Reviewed Aug 8, 2026 · Methodology

Advertising disclosure: SwitchWize may earn a referral fee if you open an account through a link above. This does not affect our rankings. Ranked using the SwitchWize methodology. Learn more

Free to embed

Add this calculator to your site

Paste this snippet into any page. No account or API key required, the widget is responsive, and it updates with live rates. A SwitchWize attribution link is included in the embed automatically.

<iframe src="https://www.switchwize.com/embed/auto-loan-interest" width="100%" height="680" loading="lazy" style="border:1px solid #e2e8f0;border-radius:14px;max-width:100%;width:100%" title="SwitchWize calculator"></iframe>
<script>(function(){window.addEventListener("message",function(e){if(e.origin!=="https://www.switchwize.com")return;var d=e.data;if(!d||d.type!=="sw-embed-resize")return;var f=document.getElementsByTagName("iframe");for(var i=0;i<f.length;i++){if(f[i].contentWindow===e.source){f[i].style.height=d.height+"px";break;}}});})();</script>

Frequently Asked Questions

Everything you need to know.

What does the Auto Loan Interest Calculator show?

Calculate total interest on an auto loan and the savings from extra monthly principal.

How should I use the result?

Use the result as a planning and comparison aid. Review the assumptions, adjust your inputs, and compare the output with your actual options before acting.

What should I do after using this calculator?

Use the related links and next-action modules on the page to compare products, continue in Money Map, or review related guidance on SwitchWize.

Is the Auto Loan Interest Calculator free to use?

Yes. SwitchWize calculators are free, and you do not need an account to run scenarios or view the result.

Does using the Auto Loan Interest Calculator affect my credit score?

No. Using a calculator does not trigger a credit check. A credit impact can occur only if you apply directly with a lender, card issuer, or provider.

Are the results personalized financial advice?

No. Calculator outputs are educational estimates based on the inputs you enter. Review assumptions and confirm terms directly with providers before making a financial decision.

What should I do after seeing the result?

Use the recommendation module on this page to plan your next move ->, or run Money Map to compare this loans & credit decision with your other opportunities.

How does SwitchWize choose related offers?

Related offers are matched by the calculator surface (auto) and ranked using SwitchWize data such as rate, fees, trust signals, product fit, and switching friction. Paid relationships do not change organic ranking order.

How fresh are the rates and offers shown?

Rate and offer data is reviewed on a recurring cadence and every offer module shows review context or links to the methodology and disclosure pages.

Where can I see the ranking methodology?

The SwitchWize methodology page explains how rate freshness, editorial review, affiliate disclosure, and category ranking factors work.

Can Money Map use this result?

Yes. Money Map is the broader diagnostic path: it compares savings, mortgage, cards, and debt so you can see whether this calculator result is your highest-impact next move.