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Fynliko

Methodology

Every Fynliko calculator uses standard, well-established financial math — not proprietary formulas. Calculations run in your browser and are checked against known-good reference values in our automated test suite. Below is how each tool works and the 2026 data we use. Last updated June 14, 2026.

By calculator

Debt payoff calculator

We simulate every debt month by month. Each month interest accrues on each balance, every debt gets its minimum payment, and the rest of your fixed budget (all minimums plus your extra) is thrown at one target debt — the highest-APR debt for avalanche, the smallest-balance debt for snowball. When a debt clears, its payment rolls onto the next. The baseline pays only minimums with no extra, so the difference is your interest and time saved.

Credit card payoff calculator

We compute your payoff two ways. For a fixed payment, we apply the standard amortization formula at your card’s monthly periodic rate (APR ÷ 12). For the minimum-payment path, we simulate the common issuer rule — 1% of the balance plus that month’s interest, with a $25 floor — recalculating as the balance falls. The gap between the two is the interest a fixed payment saves you.

Loan payment calculator

We use the standard amortizing-loan (PMT) formula to find the level monthly payment that retires your balance over the term at your APR. Each month, interest is the balance times the monthly rate (APR ÷ 12), and the rest of the payment reduces principal. Any extra payment is applied straight to principal, so the loan ends early and the schedule shows the real payoff month.

Personal loan calculator

We apply the standard amortizing-loan formula at your APR over your chosen term to produce the monthly payment, then sum the interest across the full schedule. The default rate reflects the Federal Reserve’s reported average for a 24-month unsecured personal loan; your actual rate depends on your credit profile, income and lender, so treat the figure as a starting estimate.

Auto loan calculator

The amount financed is the vehicle price plus sales tax and fees, minus your down payment and net trade-in (trade-in value less anything still owed, which can be negative). Most states tax the price minus the trade-in, which we apply by default. We then amortize the financed amount at your APR over the term to get the monthly payment, total interest and all-in cost.

Mortgage calculator

We amortize the loan amount (home price minus down payment) at your rate over the term to get principal and interest, then add monthly property tax (your rate × home value ÷ 12), homeowners insurance and HOA. PMI is added automatically when your down payment is under 20% of the price and typically drops off at 20% equity. Default rates reflect Freddie Mac's average 30-year fixed and national property-tax/insurance averages.

Student loan calculator

We apply the standard amortization formula at your rate over your repayment term to find the fixed monthly payment, then total the interest across the schedule. Any extra payment goes straight to principal, shortening the payoff. The default rate reflects the U.S. Department of Education's current federal undergraduate Direct Loan rate; private and refinanced loans vary by credit.

Debt consolidation calculator

We amortize a consolidation loan for your combined balance (plus any origination fee) at the loan’s APR and term. To compare fairly, we then pay your existing debt at that same monthly amount and compare total interest and payoff time. The saving is the interest you avoid by moving to the lower rate — not from stretching the term or borrowing more.

Balance transfer calculator

We add the transfer fee to your balance, then simulate payoff at 0% during the intro window and at the post-intro APR afterward, at your fixed monthly payment. We compare that total cost — fee included — against staying on your current card at its APR with the same payment. A transfer is only flagged worthwhile when the interest avoided beats the fee.

Debt-to-income (DTI) calculator

Front-end DTI is your monthly housing payment divided by gross monthly income; back-end DTI adds all other monthly debt (card minimums, auto, student and personal loans). We express both as percentages and compare your back-end ratio to lender benchmarks — 36% (comfortable), 43% (the Qualified-Mortgage limit) and above. Headroom is the extra monthly debt that would put you at each threshold.

Data sources

These results are educational estimates based on the figures you enter and standard financial math, not financial advice or an offer of credit. Your actual rate, payment and terms depend on your credit, lender and other factors. Verify any number with the lender before you act.