Why does a longer loan term cost more total interest?

Interest accrues on the outstanding balance every period. A longer term means you carry a balance for more periods, paying interest longer. Even at the same rate, 72 months of interest payments substantially exceeds 48 months on the same principal.

What is the difference between APR and interest rate?

The interest rate is the base cost of borrowing expressed as a percentage. APR (Annual Percentage Rate) includes the interest rate plus fees (origination fees, points, etc.) expressed as an annualized rate. APR is the true cost of a loan and the correct metric for comparing different loan offers.

When is a longer loan term worth the extra interest cost?

A longer term can be worth it if: the lower monthly payment is necessary for cash flow, you can invest the difference at a return exceeding the loan rate, or the loan allows penalty-free prepayment (meaning you can pay it off faster when cash flow allows).

What is deferred interest and how does it differ from 0% APR?

True 0% APR means no interest accrues if you pay on time. Deferred interest (common in retail financing) means interest accrues from day one — but you're not charged it if you pay off the full balance before the promotional period ends. If you don't, all the accrued interest is charged retroactively. Deferred interest is a significant trap.

⚖️Comparisons

Which Loan Option Actually Costs You Less?

Which loan option costs you less?

What This Does

When you're comparing financing offers — whether for a car, home improvement, personal loan, or any major purchase — the monthly payment is rarely the right metric to optimize. Two loans with the same monthly payment can have dramatically different total costs depending on the rate, term, and fees. The loan with the lower monthly payment is often the more expensive one. This calculator lets you compare two loan or financing scenarios side by side with complete transparency: monthly payment, total interest paid, total amount paid over the life of the loan, effective APR (including fees), and total cost difference between the two options. It's useful for any situation where you have competing offers: one lender vs another, a shorter term vs a longer term, a fixed vs a variable rate, or a promotional offer vs a standard offer. The most common mistake borrowers make is choosing based on monthly payment rather than total cost. A 72-month loan at 5% costs $3,200 more in interest than a 48-month loan at the same rate on a $30,000 principal — even though the monthly payment is $168 lower. This calculator makes the true cost of each option immediately visible, so you can make the choice that's right for your cash flow and your total wealth.

When Should You Use This?

→Comparing two loan offers from different lenders before committing
→Evaluating a shorter vs longer loan term on the same amount
→Understanding the true cost of a promotional 0% or deferred interest offer
→Comparing a loan with fees vs a loan with a higher rate but no fees
→Deciding between fixed-rate and variable-rate financing
→Evaluating refinancing by comparing current vs proposed loan terms

Example Scenario

Diana is financing a $22,000 kitchen renovation. Bank A offers 7.9% APR for 60 months ($444/month, $4,657 total interest). Bank B offers 6.4% APR for 72 months ($378/month, $5,196 total interest). Bank B's monthly payment is $66 lower — but it costs $539 more in interest and keeps her in debt 12 months longer. The calculator makes this instantly clear: she takes Bank A's offer.

Loan Finance Calculator

Compare Two Loan Offers — APR, Total Cost & Payoff Strategies

Results update in real time as you edit any field.

Annual Income ($)

Loan Purpose

Loan Amount

APR (%)

Term (months)

Origination Fee ($)

Loan Amount

APR (%)

Term (months)

Origination Fee ($)

About This Calculator

This loan finance calculator compares two loan offers side-by-side using effective APR — the true cost including origination fees — rather than just the advertised rate. Enter loan amount, APR, term in months, and any origination fee for each loan. Results update in real time as you type. The calculator automatically identifies the better loan and quantifies the exact monthly and total cost savings.

The Overview tab provides a stacked bar chart showing the principal, interest, and fee breakdown for both loans — making the true cost composition immediately visible. The Side by Side tab includes a rate sensitivity line chart showing how monthly payments change across different APR scenarios for both loans, plus a full comparison table with checkmarks on the better value for each metric. The Amortization tab renders a dual-area chart showing how both loan balances decline over time.

The Strategies tab shows a bar chart of total interest paid under four payment approaches — minimum payment, extra $100/month, extra $200/month, and bi-weekly payments — with savings labels above each bar. A loan score (0–100) rates each loan on DTI impact, interest rate, term length, and origination fees. Effective APR is calculated using a 60-iteration bisection method for high precision. Export to PDF generates a complete report with both loan details, the full comparison table, and key decision insights.

Results are estimates only and do not constitute financial, tax, or legal advice. Always consult a qualified professional before making financial decisions.