Personal, auto, and student loans share one structure: a fixed amount, a rate, and a term, repaid on a level schedule. What differs is how lenders present them, which is where comparisons go wrong.

A lower monthly payment usually means a longer term, and a longer term usually means more total interest even at the same rate. The tools below separate the monthly figure from the total cost so both are visible at once, and the comparison calculator puts two offers side by side on the same basis.

Which tool answers what

Calculator	What it estimates
Personal Loan Calculator	Estimate monthly payments and total interest for a fixed-rate personal loan.
Auto Loan Calculator	Estimate a car loan monthly payment and total interest from the vehicle price, down payment, trade-in, rate, and time to repay.
Boat Loan Calculator	Boat loan payment with down payment, trade-in and sales tax, the total interest, and the same loan over 10, 15 and 20 years side by side.
RV Loan Calculator	RV and camper loan payment with down payment, trade-in and sales tax, the total interest, and the same loan over 10, 15 and 20 years side by side.
Auto Loan Refinance Calculator	Compare your current car loan with a refinance on total interest, not just the monthly payment. Includes refinance fees, break-even month, and a loan-to-value eligibility check.
Car Affordability Calculator	Work out what car you can afford from your income and existing debts, using the 20/4/10 rule and including insurance, fuel, and maintenance — not just the loan payment.
Lease vs Buy Calculator	Compare leasing and buying a car over the same period, with the lease payment built from money factor and residual value, excess-mileage cost included, and the equity you keep by buying credited back.
Student Loan Calculator	Estimate a student loan monthly payment, how long it takes to clear, and the total interest, using a fixed rate you enter.
Loan Repayment Calculator	Estimate the monthly payment, total interest, and how long a fixed-rate loan takes to clear, with a month-by-month payment schedule.
Loan Comparison Calculator	Compare two fixed-rate loans side by side: monthly payment, total interest, total paid, and time to repay. No single option is picked for you.
APR Calculator	Estimate the APR, the rate plus certain fees, for any fixed-rate loan from the amount, stated rate, time to repay, and any fees.

Common questions

What is the difference between APR and interest rate?

The interest rate prices the borrowing alone. APR expresses the rate together with the fees required to take the loan as a single annualised figure, which is what makes it the more comparable number when two offers carry different fees.

Why does a longer term cost more overall?

A longer term spreads the same principal across more payments, so each one is smaller, but interest accrues on the outstanding balance for longer. The monthly figure falls and the total paid rises. The repayment calculator shows both figures from the same inputs.

How do I compare two loan offers properly?

Compare them on the same term and include fees, then read the total paid rather than only the monthly payment. Two offers with identical monthly figures can differ substantially in total cost if their terms or fee structures differ.

How is a repayment schedule worked out?

Each payment covers the interest accrued on the current balance first, and whatever remains reduces the principal. Because the balance falls each period, the interest share falls and the principal share rises across the term, which is what an amortization schedule sets out row by row.

Other decisions

What do I actually take home?

Income, Salary & Payroll

Estimate take-home pay, salary deductions, tax withholding, and employer payroll cost.

Can I buy this home?

Home Buying

Estimate home affordability, mortgage payments, down payment, loan-to-value, and closing costs.

How do I manage or improve my existing mortgage?

Mortgage Management

See amortization, payoff, extra payments, recasts, points, and rate-adjustment scenarios.

Should I refinance or use home equity?

Refinance & Home Equity

Compare refinance options, break-even timing, equity access, HELOCs, and cash-out choices.

How do I get out of debt?

Debt & Credit Cards

Plan payoff, minimum payments, balance transfers, consolidation, and debt ratios.

How will my money grow?

Saving, Investing & Retirement

Project compound interest, investment growth and retirement savings, and see how much the return and inflation assumptions move a long-horizon result.

Does the business make money?

Business & Pricing

Find the break-even point, price for a margin or a markup, measure a return over its holding period, and set a freelance rate from the hours you can actually bill.

What do these health measurements mean?

Health Calculators

Use browser-only screening tools with visible formulas, limitations, medical sources, and review dates.

What is the everyday answer, worked properly?

Everyday Calculators

Percentages, fractions and units; tips, discounts and fuel; dates, ages and time; grades and GPA — each one stating the convention it applied rather than hiding it.