How the simplified cost-equivalent rate is solved
This calculator is intentionally labeled as a cost-equivalent rate model. It is not a legal Regulation Z APR calculation and should not replace the APR shown on official disclosures.
The tool first calculates the monthly payment from the entered principal, note rate and term. It then treats the entered finance charges as reducing the net cash received: net loan cash equals principal minus finance charges. A numerical solver finds the monthly discount rate that makes the present value of all scheduled payments equal that net cash amount, then annualizes that monthly rate by multiplying by 12.
Standard fixed-rate amortizing paymentBased on entered principal, note rate and term.
Principal − entered finance chargesFinance charges must be lower than the positive principal.
Solved monthly discount rate × 12 × 100A simplified model output—not a disclosure APR.
Enter the note rate and term exactly as used in the payment calculation.
Enter only the assumed upfront finance charges you want represented in this simplified model.
Compare the modeled cost-equivalent rate with the note rate to understand the effect of upfront charges.
Use the creditor’s official APR disclosure for legal comparison and compliance purposes.
Best used for
- Explaining why upfront finance charges raise an effective borrowing cost
- Testing how larger or smaller entered charges affect a fixed-payment scenario
- Learning the distinction between note rate and an all-in rate concept
What this tool does not answer
- The output is not a legal APR and does not implement every disclosure rule.
- It assumes equal monthly payments and the simplified cash-flow pattern in the model.
- Timing, prepaid interest, mortgage insurance and treatment of specific fees may differ under legal APR rules.
How to read a sample result
Illustrative example: a $300,000 loan at a 6% note rate for 360 months has a modeled payment of about $1,798.65. If $5,000 of assumed finance charges reduce net loan cash to $295,000, the simplified cost-equivalent annual rate is about 6.16%.
The methodology below explains how this calculator treats the inputs and assumptions. Replace the sample values with your own planning figures. Results are estimates, not quotes, approvals, disclosures or recommendations.
Inputs and units
Note principal, note rate, term and assumed upfront finance charges. All currency entries are U.S. dollars. Percentage fields take a number such as 6 for six percent, not 0.06. Repayment terms marked in months use whole months; horizons marked in years use whole years.
Calculation workspace
Enter your own figures in the calculator above. The starting values are examples only. No personal identifiers are needed to run a scenario.
How to interpret the result
Read every result together with the assumptions you entered. Changing an input changes the scenario, not product availability. Displayed amounts are rounded for readability.
Assumptions and limitations
This is not a compliant Regulation Z APR disclosure. Fee inclusion, irregular dates and legal tolerances require the lender’s actual disclosed APR.
Review more than one scenario
Run a base case and then change one uncertain input at a time. Compare a shorter holding period, a higher cost or a different repayment term where those inputs are supported. Record which costs have not been entered. A precise-looking number can still rest on uncertain assumptions.
Invalid inputs and error recovery
If an input is missing or outside the calculator’s supported range, the page will ask you to correct it. Use negative values only in fields that explicitly allow them. A calculation error is not a credit decision.
Model documentation
The calculator methodology explains the inputs, assumptions and supported models. Use the result for planning and compare it with the provider’s written terms and applicable disclosures before making a decision.
Choose a product for your calculation
Use these comparisons for planning; final eligibility, pricing and terms are set by the provider.
Program references and comparison sources
CFPB: Loan Estimate explainer — Comparison of covered mortgage disclosures, cash to close, points, lender credits and monthly costs.
CFPB: Understand the different kinds of loans available — Loan structures, terms and repayment risks; not provider-specific eligibility.
Check the linked source for its effective date and applicable scope. A source link is not a lender partnership or an individual offer.