Payday Loan APR Calculator
Principal, fee & term
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Fill in the fields on the left and this updates as you type.
Know what this estimate is based on
- Jurisdiction
- United States card and lending practice
- Scope and limitations
- Educational estimate only. Your issuer sets the minimum-payment formula, how a payment is allocated across balances, when interest is charged, and any fees or promotional terms — check your cardholder agreement for the figures that bind.
- Source links checked
- Jul 30, 2026
Built and regression-tested by Smart Tools Lab. It has not been individually reviewed by a licensed financial, tax, or legal professional.
How to use
- 01
Enter the loan amount.
- 02
Enter the flat fee charged and the loan term in days.
- 03
See the true annual percentage rate.
Formula
This tool converts a payday loan's flat fee into a true annual percentage rate so it can be compared with mainstream credit. APR = (fee / principal) * (365 / term in days) * 100. The fee divided by the principal is the loan's cost for one term as a fraction of the amount borrowed; 365 divided by the term in days counts how many such terms fit in a year; multiplying them scales the single-term cost up to a yearly rate, and multiplying by 100 expresses it as a percentage. The tool also reports the cash you must hand back, which is simply Total to repay = principal + fee, because a payday loan does not amortize or accrue daily interest. It charges one fixed fee, and the principal plus that fee falls due in a single lump sum on the maturity date. With the default inputs (principal 10,000, fee 1,500, term 14 days), APR = (1500 / 10000) * (365 / 14) * 100, which is about 391 percent, and the total to repay is 10,000 + 1,500 = 11,500.
Example
Take the default loan: you borrow $500, the lender charges a flat fee of $75, and the whole balance is due in 14 days. That is the standard U.S. storefront shape - $15 per $100 borrowed, repaid on your next payday. Step 1 - Fee as a fraction of principal: $75 / $500 = 0.15. The loan costs 15 percent of the amount borrowed for this single 14-day term. Step 2 - Number of terms in a year: 365 / 14 = 26.07. About 26 fourteen-day terms fit inside a 365-day year. Step 3 - Annualize: 0.15 * 26.07 = 3.91. Multiply by 100 to get a percentage: APR = 3.91 * 100 = about 391 percent. So the same 15 percent fee, charged across roughly 26 terms in a year, annualizes to about 391 percent - an order of magnitude above a credit card at 22 percent, and roughly eleven times the 36 percent ceiling the Military Lending Act sets for active-duty borrowers. Step 4 - Total to repay: principal + fee = $500 + $75 = $575, due as a single lump sum on the 14th day. Step 5 - What rolling over does. If you cannot clear the $575 and instead pay the fee to extend, each new term costs another $75 and the $500 principal never moves. Roll for a full year and the fees alone come to about $1,955 on a $500 loan you still owe in full.
Definitions
- Principal
- The amount of cash you actually receive and must pay back, before the fee is added (default 10,000). The fee is calculated as a fraction of this figure.
- Flat fee
- The single fixed charge a payday lender adds for one term, quoted as an amount rather than a rate (default 1,500). It does not change whether you repay early or on the due date.
- Term in days
- How long the loan lasts before the full balance falls due, usually until your next payday (default 14 days). A shorter term means the same fee is charged more often per year, raising the APR.
- APR (annual percentage rate)
- The flat fee translated into a yearly rate so it can be compared with every other loan on the same scale. On the default loan it is about 391 percent.
- Total to repay
- The single lump sum due on the maturity date: principal + fee (10,000 + 1,500 = 11,500). There are no installments and no reduction for repaying early.
- Rollover (renewal)
- Extending the loan for another term by paying the fee again. The fee does not reduce the principal, so the debt stands still while the fees stack up - the core of the debt spiral.
Good to know
Why a 15 percent fee becomes a 391 percent rate
A payday loan rarely advertises an interest rate. Instead it quotes a flat fee, and on the surface that fee looks small. Borrowing 10,000 for fourteen days with a 1,500 fee means handing back 11,500 in two weeks, which a borrower under pressure may read as a 15 percent charge and shrug off. The trouble is that 15 percent is not the yearly cost; it is the cost of holding the money for just fourteen days. To compare a payday loan with any other form of credit, that fee has to be stretched to a full year, because every advertised loan rate, from a mortgage to a card, is expressed as an annual percentage rate. There are about 26 fourteen-day periods in a 365-day year, so the same 15 percent fee, charged 26 times, is what an annual rate has to capture. Multiplying the fee rate by that number of periods is exactly what the formula does: 15 percent times roughly 26 equals about 391 percent. The fee did not change and the loan did not get more expensive in absolute terms; annualizing simply translates a two-week price into the standard yearly language that makes honest comparison possible. Seen that way, the triple-digit figure is not a scare statistic but the true running cost of money borrowed this way, and it explains why regulators in many places insist the annual rate be disclosed alongside the flat fee.
How the calculator turns a fee into an annual rate
The engine behind this tool uses one compact expression: APR equals the fee divided by the principal, multiplied by 365 divided by the term in days, multiplied by 100. Each piece has a plain meaning. The fee divided by the principal gives the cost of the loan as a fraction of the amount borrowed for one term, which in the default case is 1,500 divided by 10,000, or 0.15. The fraction 365 divided by the term in days counts how many such terms fit inside a year, which for a fourteen-day loan is about 26.07. Multiplying those two together scales the single-term cost up to a yearly cost, and multiplying by 100 simply converts the decimal into a percentage. The second relationship the tool reports is even simpler: the total amount to repay equals the principal plus the fee, with no separate interest line, because a payday loan does not amortize or accrue daily interest in the way an installment loan does. You borrow a sum, you owe that sum plus one fixed charge, and the whole thing falls due on a single date. Keeping these two outputs side by side matters. The total-to-repay figure tells you the cash you must produce on the due date, while the APR tells you how that cash cost compares to every other credit product measured on the same annual scale. One answers what you owe; the other answers how expensive that debt really is.
Why a shorter term pushes the rate higher
The term length is the quiet lever that drives a payday loan's annual rate, and it works in the opposite direction to most people's intuition. With a mortgage or a personal loan, a shorter term usually means cheaper credit overall, because you pay interest for fewer years. With a flat-fee payday loan the relationship inverts. The fee is charged for the privilege of borrowing across one term, no matter how short that term is, so squeezing the same fee into a shorter window makes the annualized cost rise, not fall. Hold the fee at 1,500 on a 10,000 loan and watch what the term does. Over fourteen days the annual rate is about 391 percent. Shorten the term to seven days and the same fee now buys only half as much time, so it has to be charged roughly 52 times a year instead of 26, and the APR doubles to about 782 percent. Stretch the term to thirty days and the fee is spread over fewer periods, dropping the APR toward 183 percent. Nothing about the cash changed: in every case you paid 1,500 to borrow 10,000. What changed is how long that fee bought, and the annual rate faithfully reflects it. This is why the very shortness that makes payday loans feel manageable, just two weeks until payday, is precisely what makes them so expensive once measured against the yearly standard everyone else uses.
What the total-to-repay figure actually represents
Alongside the headline rate, the tool shows the total you must repay, and on the default loan that figure is 11,500: the 10,000 you received plus the 1,500 fee. It is worth dwelling on what this number does and does not tell you. It is the single lump sum due on the maturity date, typically your next payday, and it assumes the loan is settled in full and on time with no extension. There is no schedule of smaller installments, no partial payment that chips away at the balance over months, and no reduction in the fee for repaying a day early. The flat fee is fixed the moment you sign. Where this figure becomes dangerous is in the gap between the fee feeling small and the lump sum feeling large. Setting aside 1,500 over two weeks may sound bearable, but on the due date you do not owe 1,500; you owe 11,500, all at once, out of a single paycheck. For many borrowers that full repayment would leave too little to cover rent, food, and other bills until the following payday, which is exactly the squeeze that pushes people toward renewing the loan rather than clearing it. Reading the total-to-repay figure honestly, as a single obligation that must come out of one pay cycle, is the first defense against the cycle that follows. If the lump sum cannot realistically be paid in full on the due date, the loan is not affordable, whatever the fee looks like in isolation.
The rollover trap and how the debt spirals
The most damaging feature of payday borrowing is not the headline rate but the rollover, sometimes called a renewal or an extension. When the due date arrives and the borrower cannot produce the full 11,500, the lender often offers to extend the loan for another term in exchange for paying the fee again. Crucially, that new fee does not reduce the principal. After paying a second 1,500 the borrower still owes the original 10,000, having now spent 3,000 in fees and bought nothing but two more weeks. Because the principal never shrinks, the same trap resets every term, and the fees stack while the debt itself stands still. The arithmetic is stark. Each fourteen-day renewal adds 1,500. After about seven terms, roughly three months, cumulative fees reach 10,500, which already exceeds the original 10,000 borrowed, and the borrower still owes the full 10,000 on top. Carry the loan for a year through 26 renewals and the fees total around 39,000 on a 10,000 debt that has not moved at all. This is the spiral: a loan taken to cover a two-week shortfall becomes a permanent monthly drain that consumes far more than it ever advanced. The structure makes the trap easy to fall into, because paying one more fee always feels cheaper in the moment than finding the entire lump sum. Recognizing that a rollover buys time but never progress is the single most important insight for anyone weighing one of these loans.
Comparing payday loans with mainstream credit on a true-cost basis
The reason the annual percentage rate exists is to let very different credit products be lined up and compared honestly, and that is where a payday loan looks starkly different from mainstream borrowing. A typical credit card might carry an annual rate somewhere in the high tens of percent; a personal loan from a bank is often lower still; and a small-dollar loan from a credit union is frequently capped by regulation at a modest annual rate. Against any of these, the default payday loan's roughly 391 percent stands an order of magnitude higher. The comparison only becomes fair once everything is annualized, which is precisely why expressing the flat fee as an APR is so revealing. Measured by the cash handed over for one short term, 1,500 to borrow 10,000 can seem like a reasonable price for speed and convenience. Measured on the annual scale that every other lender is required to quote, the same loan is among the most expensive credit a household can take on. None of this depends on the mechanics of how a card or a bank loan is structured internally; the point is simply that once each option is reduced to one comparable yearly number, the payday loan's cost is no longer hidden by the brevity of its term. Whenever a cheaper annualized option is genuinely available and accessible in time, the true-cost comparison argues strongly for it.
Reading your own result with the right context
When you enter your own numbers, the two outputs deserve different kinds of attention. Treat the APR as a comparison yardstick. Its job is to place this loan on the same annual scale as every other form of credit so you can judge, in one glance, how costly it is relative to the alternatives. A rate in the hundreds of percent is not a rounding artifact; it is the genuine annualized price of borrowing this way, and it should be read as a warning rather than a technicality. Treat the total-to-repay figure as a cash-flow reality check. That number is the exact sum you must hand back on the due date, and the honest question is whether you can produce it in full, on time, out of a single pay cycle, without immediately needing to borrow again. If the answer is no, the loan is structurally unaffordable for you no matter how routine the fee appears. It also helps to test the inputs. Nudge the term down and watch the APR climb, which shows how the brevity of the loan drives its cost. Raise the fee slightly and see the total-to-repay move in lockstep. These small experiments turn an abstract percentage into an intuitive feel for how fee and term interact, and they make it harder for a loan that looks cheap for two weeks to disguise how expensive it is across a year.
An affordability check before you borrow
A payday loan is unusual in that the entire balance, principal plus fee, comes due on a single date out of a single paycheck, so the right affordability test is not whether the fee fits your budget but whether the full repayment does. Before borrowing, work backward from the due date. Take your expected income on that payday, subtract the rent, utilities, food, transport, and any other obligations that must be paid before the next paycheck, and see what remains. If the leftover comfortably exceeds the total-to-repay figure, the loan can in principle be cleared in one shot without forcing another loan. If it does not, the loan will almost certainly have to be rolled over, which is where the spiral begins. This is a stricter test than lenders typically apply, and deliberately so, because the structure of the product punishes anyone who cannot repay in full immediately. It is also worth asking what the shortfall actually is. A one-off, genuinely unavoidable expense that a future paycheck can absorb is a different situation from a recurring gap between income and spending. A payday loan can only ever postpone a recurring gap by two weeks while adding a fee, so if the underlying problem repeats each month, the loan compounds it rather than solving it. Running the numbers through the calculator before signing, rather than after, is the moment when an honest affordability check still has the power to change the decision.
Ways out of the cycle and cheaper paths in
For anyone already caught in repeated rollovers, the escape begins with seeing the renewal for what it is: a payment that buys time but never reduces the debt. Breaking the cycle means finding a way to retire the principal itself rather than paying yet another fee against it. That might mean negotiating an extended repayment plan, which many jurisdictions require lenders to offer and which converts the lump sum into scheduled installments without further fees, or consolidating the balance into a lower-cost loan whose annual rate is a fraction of the payday rate. Even a difficult conversation with a creditor about a bill the loan was meant to cover can sometimes beat paying 1,500 every two weeks indefinitely. For anyone weighing a payday loan in the first place, the cheapest path is usually to avoid the annualized cost altogether. A small emergency fund, even a few weeks of essential expenses, removes the need to borrow at a triple-digit rate for the next minor shock. A small-dollar loan from a credit union, an employer salary advance, or a structured installment loan typically carries an annual rate many times lower, and on a true-cost basis that gap is enormous over even a few months. The common thread is to compare every option on its annualized cost and on whether it can be repaid without forcing the next loan. The payday loan's defining weakness is that its convenience is priced at an annual rate few other products approach, so almost any alternative that buys real time to repay is worth pursuing first.
What the annual rate does and does not capture
The annual percentage rate this tool produces is a faithful translation of one flat fee into yearly terms, but it is worth being precise about its limits so the number is neither dismissed nor over-read. What it does capture is the genuine annualized cost of the single fee charged for one term, which is exactly what makes it comparable to the quoted rate on any other loan. It assumes the loan is taken once, for the stated term, and repaid in full at the end. What it does not capture is everything that happens when the loan does not go to plan. It does not include the fees from rollovers, which is why a borrower who renews repeatedly pays far more in practice than a single term's APR suggests; the cumulative cost of renewals climbs well beyond the headline rate. It does not include late penalties, returned-payment charges, or collection costs that a missed due date can trigger, nor any effect on access to future credit. It also says nothing about the principal itself, which the total-to-repay figure handles separately. In short, the APR is the right tool for comparing the cost of a clean, single-term payday loan against other credit on equal footing, and it is deliberately conservative because it assumes the best case. The real-world cost of a payday loan that is rolled over, paid late, or sent to collections is higher still, which means a 391 percent headline should be read as a floor on how expensive this borrowing can become, not a ceiling.
Frequently asked questions
If the fee is only 15 percent, where does a 391 percent rate come from?
The 15 percent is the cost of borrowing for just 14 days, not for a year. To compare a payday loan with any other credit, that fee has to be stretched to a full year. About 26 fourteen-day terms fit in 365 days, so the same 15 percent fee charged across those terms annualizes to roughly 391 percent. The loan did not get more expensive in absolute terms; the APR simply restates the two-week price in the standard yearly language every lender uses.
Does paying the fee again at renewal reduce what I owe?
No. A rollover fee buys you another term but does not touch the principal. After paying a second 1,500 fee you still owe the original 10,000, having spent 3,000 in fees for nothing but two more weeks. Because the principal never shrinks, the trap resets every term and the fees accumulate while the debt stands still. This is exactly how a short-term loan becomes a long-term drain.
Why does a shorter term make the loan more expensive, not cheaper?
With most loans a shorter term means less total interest. A flat-fee payday loan is the opposite: the fee is charged once per term regardless of length, so squeezing the same fee into a shorter window means it is charged more often per year. Holding the 1,500 fee fixed, a 14-day term annualizes to about 391 percent, a 7-day term to about 782 percent, and a 30-day term to about 183 percent.
How does the cost compare with a credit card or a bank loan?
Once everything is annualized, the gap is large. A credit card might carry an annual rate in the high tens of percent, a bank personal loan often lower, and a credit-union small-dollar loan is frequently capped at a modest rate by regulation. The default payday loan's roughly 391 percent stands an order of magnitude above all of them. Expressing the flat fee as an APR is what makes that true-cost comparison visible.
Does the APR shown include the cost of rolling the loan over?
No. The APR assumes a clean, single-term loan taken once and repaid in full on the due date. It does not include renewal fees, late penalties, returned-payment charges, or collection costs. A borrower who renews repeatedly pays far more than the headline rate suggests - after about seven 14-day terms the cumulative fees already exceed the original principal. Treat the displayed APR as a floor on the cost, not a ceiling.
How do I know whether I can actually afford a payday loan?
Test the full repayment, not the fee. The entire balance - principal plus fee, 11,500 on the default loan - comes due on one date out of one paycheck. Take your expected income on that payday, subtract rent, utilities, food, and other bills due before the next paycheck, and check whether the leftover comfortably exceeds the total to repay. If it does not, the loan will likely be rolled over, and the spiral begins.