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ToolGrym

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Loan & Debt Calculators

Mortgages, car loans, payoff plans, and debt-elimination strategies — see exactly what borrowing costs you.

28

calculators available

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Calculator index

Every tool is free, private, and explains the formula behind the result.

Featured calculator

Mortgage Calculator

Estimate a complete monthly mortgage payment with principal, interest, property tax, insurance, PMI, and HOA dues. See total interest and loan cost.

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  1. Loans calculator

    Loan Payoff Calculator

    See when any loan will be paid off and how much interest and time extra payments save you. Works for personal loans, auto loans, and more.
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  2. Loans calculator

    Car Loan Calculator

    Estimate your monthly car payment including trade-in value, down payment, and sales tax. See total interest and the full cost of your auto loan.
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  3. Loans calculator

    Debt Snowball Calculator

    Compare the debt snowball and avalanche methods with your real balances. See your debt-free date, payoff order, and total interest for each strategy.
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  4. Loans calculator

    Mortgage Affordability Calculator

    Find the home price your income supports using the 28/36 rule lenders use, including your debts, down payment, taxes, and insurance.
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  5. Loans calculator

    Refinance Calculator

    See if refinancing pays off: new payment, monthly savings, break-even point on closing costs, and lifetime interest compared with your current loan.
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  6. Loans calculator

    Personal Loan Calculator

    Calculate your personal loan payment, total interest, and the cash you actually receive after origination fees. Compare terms instantly.
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  7. Loans calculator

    Student Loan Calculator

    Calculate your monthly student loan payment, total interest, and how much faster extra payments clear the debt. Works for federal and private loans.
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  8. Loans calculator

    Credit Card Payoff Calculator

    See when your credit card will be paid off with a fixed payment — and what minimum payments would really cost you in years and interest.
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  9. Credit Cards

    Credit Utilization Calculator

    Calculate total and per-card credit utilization, then see exactly how much to pay down to reach your target ratio. Private and instant.
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  10. Credit Cards

    Credit Card Balance Transfer Calculator

    Compare a balance transfer with keeping your current card. Include the transfer fee, promo APR, post-promo APR, payoff time, and real savings.
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  11. Mortgages

    Biweekly Mortgage Payment Calculator

    Compare monthly and accelerated biweekly mortgage payments. See your biweekly amount, new payoff date, time saved, and interest savings.
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  12. Loans calculator

    Debt-to-Income Ratio Calculator

    Calculate your front-end and back-end DTI the way lenders do, see how you rate against the 36% and 43% thresholds, and what room you have left.
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  13. Mortgages

    Rent vs. Buy Calculator

    Compare renting and buying with mortgage, PMI, HOA, equity, appreciation, rent growth, selling costs, and invested cash.
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  14. Mortgages

    Mortgage Amortization Calculator

    Build an annual mortgage amortization schedule and see how monthly extra principal changes payoff time, total interest, and remaining balance.
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  15. Mortgages

    Down Payment & PMI Calculator

    Estimate cash down, starting loan-to-value, monthly PMI, total PMI, and when scheduled mortgage principal may reach 80% LTV.
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  16. Credit Cards

    Credit Card Minimum Payment Calculator

    Estimate payoff time and interest with a declining credit-card minimum payment, then compare a fixed monthly payment using the same balance and APR.
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  17. Debt Payoff

    Debt Consolidation Calculator

    Compare current debt with a consolidation loan, including APR, loan term, financed origination fee, monthly payment, and complete finance cost.
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  18. Mortgages

    Mortgage Points Calculator

    Compare mortgage payments with and without discount points, calculate the break-even month, and test net savings for the time you expect to keep the loan.
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  19. Auto Loans

    Car Lease vs. Buy Calculator

    Compare leasing and buying a car over the same period, including down payments, monthly payments, loan balance, depreciation, maintenance, and equity.
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  20. Mortgages

    Buyer Closing Costs Calculator

    Estimate buyer closing costs and cash to close from the down payment, lender fees, points, title costs, inspections, prepaids, credits, and deposits.
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  21. Mortgage Programs

    FHA Loan Calculator

    Estimate an FHA mortgage payment with upfront MIP, annual MIP, down payment, rate, and term. Adjust fees to match your Loan Estimate.
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  22. Mortgage Programs

    VA Loan Calculator

    Estimate a VA home-loan payment with an optional financed funding fee, down payment, rate, and term. No monthly mortgage insurance is modeled.
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  23. Mortgage Programs

    USDA Loan Calculator

    Estimate a USDA guaranteed-loan payment with the upfront guarantee fee, annual fee, rate, term, and optional down payment.
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  24. Mortgage Programs

    Adjustable-Rate Mortgage Calculator

    Compare an adjustable-rate mortgage initial payment with a reset-rate stress case after the fixed period. See the payment change clearly.
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  25. Home Equity

    HELOC Payment Calculator

    Estimate a HELOC interest-only draw payment and the fully amortizing repayment payment, including the payment jump after the draw period.
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  26. Home Equity

    Home Equity Loan Calculator

    Estimate a fixed-rate home equity loan payment, total interest, and combined payment with your existing mortgage.
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  27. Credit Cards

    Credit Card Interest Calculator

    Estimate first-month credit-card interest, total interest, and payoff time at a fixed monthly payment. APR and issuer rules vary.
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Desk notes

What these calculators reveal

Borrowing money is rarely as simple as the monthly payment a lender quotes you. Interest compounds against you, loan terms stretch costs in ways that are hard to see, and small decisions — an extra $100 a month, a slightly shorter term, a lower rate after refinancing — can change what you pay by tens of thousands of dollars. The calculators in this section make those trade-offs visible. You can build a full mortgage amortization schedule and watch how extra payments cut years off the loan, compare a debt snowball against a debt avalanche with your actual balances, price out a car loan with trade-in value and sales tax included, and find the true payoff date for any loan. Every calculator runs instantly in your browser, shows the formula behind the result, and walks through a worked example so you can verify the math yourself. Nothing here requires an account, and none of your numbers leave your device. Use these tools to pressure-test a lender’s offer before you sign, to build a realistic payoff plan for the debt you already carry, or simply to understand where every dollar of a payment goes — principal, interest, taxes, and fees.