Loan and Debt Calculators That Show the Math
Every calculator on this site does one job and shows its formula, so you can check the result by hand. Use them before you apply, not after: the numbers that decide whether a loan is worth taking are the payment, the total cost, and what the fee removes from the money you receive. This hub lists each tool, the question it answers, and a worked example you can reproduce to the cent.
Key takeaways
- Start with your debt-to-income ratio, because it limits what any lender will approve.
- Compare loans on total repayment, not the monthly payment.
- If a lender takes an origination fee, borrow enough to net the amount you need, and price that larger loan.
- All tools are educational estimates. Your actual terms come from the lender's offer.
Which calculator should you use first?
Figure: the order to run the tools on this site. DTI is defined by the CFPB; settlement fee timing follows 16 CFR 310.4(a)(5).
What does each calculator answer?
| Calculator | Question it answers | Inputs | Core formula |
|---|---|---|---|
| Personal loan payment calculator | What is my payment and total cost? | Amount, APR, term, fee | Payment = P × r ÷ (1 − (1 + r)^−n), r = interest rate ÷ 12 |
| Origination fee calculator | How much must I borrow to net $X? | Amount needed, fee % | Loan = needed ÷ (1 − fee) |
| Debt-to-income calculator | Can I take on another payment? | Monthly debts, gross monthly income | DTI = debts ÷ income |
| APR estimator by credit band | What APR range is realistic for my score? | Score band, amount, term | Published averages by band |
| Consolidation break-even calculator | Does a consolidation loan cost less than what I pay now? | Balances, rates, minimums, loan offer | Total cost of each schedule compared |
| Snowball vs avalanche calculator | Which payoff order finishes sooner or costs less? | Balances, rates, minimums, extra payment | Month-by-month simulation |
| Debt settlement cost calculator | What would settlement cost after fees and tax? | Each debt's enrolled balance and settlement ($ or %), fee basis and percent, monthly deposit, tax rate | Paid to creditors + fees + other charges + estimated tax on the forgiven amount |
| Repair: borrow now or wait calculator | Is financing a repair now cheaper than waiting? | Repair cost, loan terms, cost of waiting | Loan total cost vs waiting cost |
| HELOC borrowing limit calculator | How large a line could my home equity support? | Home value, mortgage balance, other liens, CLTV limit | Line = home value × CLTV limit, minus every loan already secured by the home |
| Refinance break-even calculator | How many months until a refinance earns back its costs? | Current loan, new rate and term, closing costs, months you expect to keep the loan | Months of payment savings to cover closing costs, plus an interest view for a reset term |
Can you check the math by hand?
Yes. Three worked examples, each reproducible to the cent.
Monthly payment. $5,000 at 10% APR for 36 months. The monthly rate r = 0.10 ÷ 12 = 0.0083333. Then (1 + r)^36 = 1.348182. Payment = 5,000 × 0.0083333 × 1.348182 ÷ (1.348182 − 1) = $161.34. Over 36 payments: $5,808.24 in total, $808.24 of it interest. That is the site's representative example.
Representative example. For a $5,000 loan at a 10% APR over 36 months, the monthly repayment would be $161.34. Over the term, the total repayment would amount to $5,808.24, with $808.24 in interest. The loan terms range from 6 months to 12 years, with APRs between 5.99% and 35.99%. The exact rate you receive depends on factors like your creditworthiness, loan size, and repayment schedule. Better rates are typically offered to those with excellent credit.
Debt-to-income. The CFPB's own example: $1,500 mortgage + $100 auto loan + $400 other debts = $2,000 a month in debt payments. Divided by $6,000 gross monthly income, DTI = 33% (0.3333).
Net proceeds after a fee. You need $5,000 in hand and the lender charges a 5% origination fee. Loan = 5,000 ÷ 0.95 = $5,263.16. The fee is 5% of $5,263.16, or $263.16, leaving $5,000.00. The CFPB notes the APR includes origination charges, which is why the fee raises the APR above the interest rate.
About these tools. Each calculator is an educational illustration based on what you enter. It is not an offer of credit or a quote. Lenders set the actual APR, fee and term. Settlement estimates are not a prediction of what any creditor will accept, and whether forgiven debt is taxable depends on your situation, per the IRS.
Loans Generator may be paid when you click or submit a request through this link. This does not change what we report.
Where each result leads
Each calculator's result screen hands you to the hub that acts on it:
- Payment, fee and APR results: personal loans and personal loans by credit score.
- Repair and purchase results: financing guides by need.
- Comparing specific lenders' terms: lender reviews and comparisons.
- Break-even and payoff results: debt consolidation.
- Settlement cost results: debt relief options.
- HELOC limit and refinance break-even results: home equity loans, HELOCs and refinancing.
- DTI or score holding you back: credit scores for borrowers.
Back to the Loans Generator home page.
Common questions
How is a personal loan payment calculated?
With the standard amortization formula: payment = P × r ÷ (1 − (1 + r)^−n), where P is the amount, r is the monthly interest rate (the annual interest rate ÷ 12, which equals APR ÷ 12 only when there are no fees) and n is the number of months. $5,000 at 10% for 36 months gives $161.34.
What counts as debt in a DTI calculation?
The CFPB defines DTI as all your monthly debt payments divided by your gross monthly income, which is income before taxes and deductions. Its example counts a mortgage, an auto loan and other debt payments.
Why should I borrow more than I need when there is a fee?
Because many lenders deduct the origination fee from the loan before funding it. To receive $5,000 with a 5% fee, you would borrow $5,263.16.
Are these calculators accurate?
The math is exact for the inputs you enter. Real offers can differ in rate, fee and term, and settlement outcomes depend on each creditor. Treat the result as an estimate to compare options.
Does using a calculator affect my credit?
No. The calculators do not pull your credit. Only a prequalification or application with a lender involves an inquiry.
Sources
- Consumer Financial Protection Bureau, "What is a debt-to-income ratio?", accessed October 28, 2026.
- Consumer Financial Protection Bureau, "What is the difference between a loan interest rate and the APR?", accessed October 28, 2026.
- 16 CFR 310.4, Telemarketing Sales Rule, via eCFR, accessed October 28, 2026.
- Internal Revenue Service, "Topic no. 431, Canceled debt - Is it taxable or not?", accessed October 28, 2026.
Loans Generator is not a loan provider or broker. We connect users with lending partners who may offer loans. Loans Generator may be paid by lending partners when you submit a request. Submitting a connection request on our site does not count as a loan application. To receive an actual loan offer, you must apply directly with a lender. We cannot guarantee loan approval, any particular rate or term, or any result from a calculator. Always review the loan agreement carefully before proceeding. This page is general information, not legal, tax, or financial advice.