Start with usable proceeds
A deducted charge reduces the money available even when the note amount is unchanged. A financed charge increases principal and can accrue interest throughout the term.
APR Calculator
Calculate an economic cash-flow APR from usable proceeds with amortizing or interest-only repayment, five compounding conventions, three payment frequencies, financed, withheld, upfront and recurring charges, balloon exposure, income burden, alternative offers, Chart.js balance paths, sensitivity, and a full ledger.
Cash-flow APR, fee treatment, compounding, balloon, alternatives, and amortization
Measure borrowing cost from usable proceeds—not only the note amount
Model amortizing or interest-only repayment, payment and compounding frequencies, financed, deducted, and upfront charges, origination treatment, recurring costs, balloon exposure, income burden, offer comparison, rate and fee sensitivity, and the complete repayment ledger.
Plan with context
The note rate prices interest; APR connects required cash flows to usable proceeds.
Two loans with the same stated rate can have different costs when fees are financed, withheld, paid at closing, or collected with every payment. Timing and treatment must remain visible.
APR and effective annual cost differ
A cash-flow APR commonly annualizes the periodic rate by multiplication. Effective annual cost compounds that periodic rate and is therefore a separate comparison measure.
Payment and compounding can differ
Monthly, biweekly, or weekly payments need a rate consistent with the contract's compounding convention. Silently dividing every nominal rate by twelve can misstate nonmonthly structures.
A lower payment can hide a longer term
Extending repayment normally reduces each installment but can increase total interest and required fees. Compare APR, total outlay, and maturity date together.
Interest-only shifts principal to maturity
Periodic interest payments can look affordable while leaving the full principal due at the end. The maturity payoff is a real obligation, not a future detail.
Legal APR follows disclosure rules
Regulated APR can include or exclude specific charges and prescribe dates, tolerances, rounding, and insurance treatment. An economic model does not replace the lender's formal disclosure.
Included
Amortizing and interest-only structures, years and months, monthly, biweekly, or weekly payments, annual through daily compounding, nominal rate, financed, withheld, upfront, percentage and recurring charges, three origination treatments, balloon, usable proceeds, periodic payment, modeled cash-flow APR, effective annual cost, finance charge, income burden, alternative rate, term and origination charge, five sensitivities, Chart.js cost and balance visuals, and a complete repayment ledger.
Not included
A jurisdiction-specific legal APR, odd first periods, calendar dates, day-count accrual, payment holidays, variable indexes, caps, prepayment penalties, mortgage escrow, mortgage-insurance disclosure treatment, optional-product classification, late fees, default interest, tax effects, credit approval, lender tolerances, rescission, or an official loan estimate.
Use it well
Copy figures from formal disclosures, identify which charges are required for the quoted credit, compare identical proceeds and payment dates, include maturity obligations, review APR and total cash together, and obtain clarification when a lender's disclosed APR differs from the entered cash-flow result.