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Fixed APR Calculator

Calculate the fixed annual percentage rate and understand the true cost of borrowing with fixed interest rates.

Fixed APR Formulas

APR
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Monthly Payment
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Total Interest
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How to use this fixed APR calculator

  1. Enter the Loan Amount ($) — the gross principal the lender will fund before any fees are netted out of the disbursement.
  2. Type the Fixed Interest Rate (%) — the locked rate from the loan note (for example, 6.5% on a 30-year fixed mortgage or 9% on a 5-year personal loan).
  3. Enter the Loan Term (months) — for example, 60 for a 5-year auto or personal loan, 360 for a 30-year fixed mortgage.
  4. Add the Origination Fees ($) the lender charges at closing (origination, underwriting, document prep, discount points expressed in dollars).
  5. Click Calculate APR to see the true fixed APR, monthly payment, total interest paid over the locked term, and total loan cost.

Examples

30-year fixed mortgage at 6.5% with $4,000 in closing costs

A buyer locks a $300,000 conventional mortgage at a 6.5% fixed rate for 30 years. Lender-paid finance charges (origination plus one discount point) total $4,000 at closing.

ResultMonthly principal-and-interest payment of about $1,896. The $4,000 fee lifts the disclosed APR to roughly 6.62% — the rate is locked, so this APR will not move for 30 years unless the borrower refinances.

Because the rate is fixed, the lender can disclose a single APR at closing that holds for the entire amortization. Over 30 years, $4,000 spread across the loan only adds about 0.12% to the APR — far less than the same fee would add to a short personal loan. The borrower's payment is contractually protected from rate moves, which is the headline trade-off of choosing fixed over an ARM.

5-year personal loan at 9% fixed with a $200 origination fee

A borrower takes a $15,000 unsecured personal loan from a credit union at a 9% fixed rate over 60 months. The credit union charges a flat $200 origination fee deducted from the disbursement.

ResultMonthly payment about $311. The $200 fee pushes the fixed APR to roughly 9.18% — about 0.18 percentage points above the stated rate, and locked for the full five years.

Fixed installment loans like this are the cleanest case for fixed APR: the payment, the rate, and the payoff date are all known up front. The borrower can plug the disclosed APR into a budget for the next 60 months without worrying about index moves. Compare to a variable-rate personal line, where Prime + margin could float the rate during the same period.

Credit card balance transfer at 0% intro, then 17.99% fixed

A cardholder transfers $5,000 to a card offering 0% intro APR for 12 months with a 3% balance-transfer fee ($150), then a 17.99% fixed go-to APR. They plan to pay $300/month and clear the balance in roughly 18 months.

ResultIf the balance carried beyond the intro window, the fixed 17.99% go-to APR with the $150 transfer fee produces an effective fixed APR near 19.6% on the residual balance. Pay the balance off inside the 12-month promo and the realized rate stays close to the 3% transfer-fee equivalent.

On a fixed-rate credit card, 'fixed' means the rate is not pegged to an index — but issuers still reserve the right to change it on 45 days' written notice under the CARD Act. The teaser 0% is also a separate rate that expires; the calculator estimates only the post-promo cost. Always read the disclosure box for the variable-or-fixed designation and the change-in-terms clause.

How it works

A fixed APR is the disclosed annualized cost of a loan whose interest rate is contractually locked for the entire term — most commonly a fixed-rate mortgage, a fixed-rate auto loan, a fixed-rate personal loan, or a fixed-rate credit card. The math is the same as for any APR; what makes it 'fixed' is the rate's stability, not a different formula.

The calculator first applies the standard amortization formula M=P⋅r(1+r)n(1+r)n−1M = P \cdot \frac{r(1+r)^n}{(1+r)^n - 1} to compute the monthly payment at the locked rate rr over nn months. Total interest is the sum of payments minus principal. The fixed APR is the rate that, applied to the net loan proceeds (principal minus origination fees), produces the same payment stream. Because the contract rate cannot change, the APR disclosed at closing remains the APR for the life of the loan.

Variable APRs work differently. They are tied to an index — typically the Wall Street Journal Prime Rate or the Secured Overnight Financing Rate (SOFR) — plus a margin. A HELOC at 'Prime + 1.5%' will move every time the Federal Reserve changes the target rate. A 5/1 ARM is fixed for five years and then floats annually. Most U.S. credit cards are variable-rate even when issuers describe individual rates as 'fixed for now.'

Regulation Z (Truth in Lending) governs both the inclusion of fees and the labeling of a rate as fixed versus variable. Under 12 CFR 1026.18, a closed-end loan must disclose whether the APR can increase, and a credit-card account is treated as variable if its rate is tied to any index. The fixed APR is the simpler disclosure: one number, locked, with the same monthly payment for the full amortization.

When to use this calculator

  • Shopping a 30-year fixed mortgage against a 7/1 ARM. Run the locked rate plus closing costs through this calculator to get the 30-year fixed APR, then compare to the ARM's introductory APR plus its rate-adjustment caps. The fixed APR is the worst-case for the fixed loan; the ARM's worst-case may be much higher.
  • Choosing a fixed-rate auto loan over dealer financing. Credit unions and banks usually quote a fixed APR with a small flat fee. Dealer financing may bundle add-ons that lift the effective fixed APR. Compute both fixed APRs to see the apples-to-apples difference.
  • Locking a fixed personal loan to consolidate variable credit-card debt. Variable credit-card APRs (often Prime + 12% to Prime + 22%) move with Fed policy. A fixed personal loan at a known APR can stabilize the payment. Use the calculator to confirm the fixed APR comes in below the blended variable APR on the cards being paid off.
  • Evaluating a 'fixed' credit-card go-to APR after a 0% transfer promo. After the intro window, the go-to APR applies. Even if the card lists the rate as 'fixed,' the CARD Act lets issuers change it on 45 days' notice. The calculator estimates the cost of carrying a residual balance at the disclosed fixed go-to rate.
  • Comparing two fixed offers with identical rates but different fees. Two lenders can quote the same locked rate but very different origination costs. The fixed APR is the comparison the CFPB Loan Estimate puts side by side specifically to expose this gap.

Common mistakes

  • MistakeAssuming 'fixed' means the rate can never change.
    FixFixed installment loans (mortgages, auto, personal) hold the rate for the full term. Fixed-rate credit cards, however, can still be changed by the issuer with 45 days' written notice under the CARD Act. Read the change-in-terms clause.
  • MistakeComparing a fixed APR directly to a variable APR's headline rate.
    FixA 6.5% fixed mortgage APR is locked. A 5.5% 7/1 ARM may reset to 8% or higher after year seven. Compare the fixed APR to the variable APR's full lifetime cap, not the introductory rate.
  • MistakeTreating a teaser or introductory APR as the loan's fixed APR.
    Fix0% intro and balance-transfer offers expire — usually after 12 to 21 months — and revert to a much higher go-to APR. The disclosure box lists both rates. Plug the go-to rate into the calculator to plan beyond the promo.
  • MistakeIgnoring fees because the rate is locked.
    FixOrigination and discount points still raise the fixed APR above the stated rate. On a 5-year loan a $500 fee can add 0.5%; on a 30-year mortgage a $4,000 fee adds about 0.12%. Always include fees in the input.
  • MistakeConfusing fixed APR with APY on a fixed-rate savings product.
    FixAPR is the cost of borrowing without compounding; APY (or effective annual rate) reflects compounding and applies to deposits. A bank advertising a 4.50% fixed APY on a CD is not quoting an APR — they are different sides of the same rate.

Frequently asked questions

What's the difference between fixed APR and variable APR?

A fixed APR is locked at closing and does not move for the entire term. A variable APR is tied to an index (Prime Rate, SOFR) plus a margin, so it changes when the index changes. Most U.S. mortgages, auto loans, and personal loans are fixed; HELOCs, ARMs, and the majority of credit cards are variable. Under Regulation Z the lender must disclose which one applies.

Can a fixed APR ever change?

On a closed-end installment loan (mortgage, auto, personal loan) the fixed APR holds for the entire amortization unless you refinance. On a credit card labeled 'fixed,' the CARD Act still permits the issuer to change the rate prospectively with 45 days' written notice — the 'fixed' designation just means the rate is not pegged to an index. Penalty APRs can also be triggered by late payments.

Is fixed APR always better than variable APR?

Not necessarily. Fixed APR trades a higher initial rate for certainty; variable APR usually starts lower and can fall if the index drops, but it can also rise. Fixed makes sense when you plan to hold the loan long, expect rates to climb, or need a predictable payment. Variable can make sense for short payoff horizons or in a falling-rate environment.

How is fixed APR calculated?

Compute the monthly payment from the locked rate and term using the amortization formula, then find the rate that equates the same payment to the net proceeds (principal minus origination fees). For a 30-year $300,000 mortgage at 6.5% with $4,000 in fees: monthly P&I about $1,896, payment-times-360 minus principal gives total interest, and solving for the rate on a $296,000 effective principal produces an APR near 6.62%.

What's a teaser rate, and is it the fixed APR?

A teaser (or introductory) rate is a temporary promotional rate — commonly 0% for 12 to 21 months on credit cards or a low first-year rate on a step-up loan — that reverts to a go-to APR after the promo window. It is not the fixed APR of the underlying account. CFPB rules require the go-to rate to be clearly disclosed so consumers can plan past the promo.

How does fixed APR compare to APY?

APR is a simple annual borrowing rate that does not include intra-year compounding; APY (Annual Percentage Yield) is the effective annual rate after compounding. Banks advertise APY on deposits; lenders disclose APR on debt. For monthly-compounded debt the effective rate is slightly higher than the disclosed APR — most pronounced on credit cards with daily compounding.

Why is my fixed APR higher than the interest rate on my note?

Because APR includes finance charges and origination fees that the simple interest rate does not. Under Regulation Z, points, origination fees, mortgage broker fees, and most prepaid interest are folded in. The gap shrinks on long mortgages (a $4,000 fee on a 30-year loan adds about 0.12%) and grows on short personal loans.

Do all 30-year fixed mortgages have the same APR?

No. Two lenders can quote the same 6.5% locked rate but very different fees, producing different fixed APRs. The CFPB Loan Estimate form was designed specifically to make this difference visible — APR is displayed prominently so identical headline rates with different closing-cost stacks can be compared honestly.

Does the fixed APR change if I make extra principal payments?

No. The disclosed APR assumes the scheduled amortization. If you prepay, you cut total interest and shorten the payoff, but the APR — defined as the rate that equates payments to proceeds — does not change. Some loans charge a prepayment penalty; if so, that fee can effectively raise your realized cost.

Are fixed-rate credit cards still common?

Less than they once were. After the 2009 CARD Act tightened the rules for changing fixed rates, most issuers moved to variable pricing tied to the U.S. Prime Rate. A handful of credit unions still offer truly fixed-rate cards. If a card is labeled 'fixed,' check the cardholder agreement for the change-in-terms clause.

What does the fixed APR include that the monthly payment does not?

Origination and finance charges. The scheduled monthly payment is computed from the stated rate on the full principal. The fixed APR additionally annualizes the upfront fees, spreading them across the term. That is why APR is always greater than or equal to the stated rate when fees are present.

Does this calculator handle revolving credit-card APR?

Not directly. It is designed for closed-end installment loans with a fixed rate, fixed term, and amortizing payment. Credit-card APR uses a daily periodic rate applied to your average daily balance and is not produced by the installment formula. For a fixed-rate card, the disclosed purchase APR is the right number to plan with.

Sources

Methodology

This calculator computes a fixed APR for closed-end installment loans whose interest rate is contractually locked for the full term. It first applies the standard amortization formula M = P · r(1+r)^n / ((1+r)^n − 1) to derive the monthly payment from the locked rate r and term n, then solves for the rate r* that equates the same payment stream to the net loan proceeds (principal minus origination fees) and returns r* as the disclosed APR. The approach mirrors the Regulation Z (Truth in Lending) methodology for fixed-rate closed-end credit; for variable-rate products (HELOCs, ARMs, most credit cards) the disclosed APR uses different assumptions and is not produced by this calculator.

Learn more about our methodology →

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