Payday Loan Calculator — the true APR and total cost

A payday loan calculator exists to do one thing plainly: turn a small, friendly-looking dollar fee into the real annual percentage rate it actually represents, so you see the number before you sign rather than after. A $60 fee on a $400 loan for two weeks doesn't sound dramatic. Expressed as an APR — the same yardstick used for every mortgage, credit card, and auto loan in the country — that fee works out to roughly 391%. That gap between "how it's marketed" and "what it costs" is the entire reason this tool exists.

We built it at Arb Digital because search after search for "payday loan calculator" turns up either nothing useful or a lender's own marketing page dressed up as a calculator. This one has no lender behind it, nothing to sell, and one job: show you the real number and point you toward cheaper alternatives if you need cash fast.

What This Payday Loan Calculator Does

You enter the amount you'd borrow, the flat fee the lender quotes, the loan term in days (typically 14, matching a biweekly pay cycle), and how many times you'd expect to roll the loan over if you can't repay it on the due date. The calculator converts the fee into an annualized rate using the same math regulators use, then shows what a rollover chain actually costs in dollars — because a rollover isn't a grace period, it's a brand-new fee on top of the last one.

How to Use It

1. Enter the loan amount you're considering borrowing — the amount that actually lands in your account.
2. Enter the fee the lender is quoting. Payday lenders typically charge a flat fee per $100 borrowed rather than a traditional interest rate, which is exactly why the true cost is so easy to underestimate.
3. Enter the loan term in days. Most payday loans run 14 days, timed to your next paycheck, but some run shorter or longer — check your specific offer.
4. Enter expected rollovers. If you're not fully confident you can repay on the due date, model 1 or 2 rollovers to see the compounding real cost — this is the scenario that traps most borrowers.
5. Read the effective APR at the top. This is the number to compare against every other borrowing option available to you before you commit.

The Formula — How It's Calculated

The core conversion is straightforward and mirrors the method described by the Consumer Financial Protection Bureau (CFPB):

APR = (Fee ÷ Loan amount) × (365 ÷ Loan term in days) × 100

For a $400 loan with a $60 fee over 14 days, that's (60 ÷ 400) × (365 ÷ 14) × 100 = 0.15 × 26.07 × 100 ≈ 391% APR. Total cost with rollovers adds one full fee for every extra term: total fees = fee × (1 + number of rollovers), and total repaid = loan amount + total fees. The annualizing step — stretching a two-week fee out to a 365-day rate — is exactly why the number looks so extreme relative to the flat dollar fee: it's the same math that makes a 14-day 15% fee equivalent to paying that 15% about 26 times over in a single year if you kept re-borrowing at the same rate.

Why a Small Fee Hides Such a Large Rate

Payday lenders are not required to advertise in APR terms the way a bank or credit card is, so the offer you see is almost always framed as a flat dollar fee: "$15 per $100 borrowed," "$60 to borrow $400." That framing is technically accurate and psychologically effective — $60 feels like a manageable cost for a two-week bridge. What it obscures is the time dimension. A 15% cost over two weeks, if repeated across a full year, compounds to a number that would be illegal for almost any other consumer lender to charge. The fee itself isn't hidden; the annualized rate behind it is, simply because nobody frames it that way at the counter.

The Rollover Trap

The single most important thing to understand about payday loans is that most of them are not one-time, two-week transactions in practice. The CFPB's own research has repeatedly found that most payday loans are re-borrowed within a month of the original loan, and a large share of borrowers end up paying more in fees over time than the amount of money they originally borrowed — without the principal ever shrinking, because each rollover typically just re-charges the same fee to extend the same balance. Run the rollover field in this calculator up to 3 or 4 to see how quickly a $400 loan can generate several hundred dollars in fees alone, on top of the original $400 still owed. That's not a worst-case scenario — the CFPB has documented it as a common outcome, not a rare one.

Cheaper Alternatives Worth Checking First

Before taking a payday loan, it's worth ten minutes to check whether a cheaper option is available, because the gap in cost is usually enormous:

• Credit union Payday Alternative Loans (PALs). Federally chartered credit unions offer small-dollar loans specifically designed to undercut payday lenders, with APRs capped well below 30% and repayment terms stretched over months instead of days.
• A credit card cash advance. It's rarely a good option on its own — advances typically carry APRs around 25–30% and start accruing interest immediately with no grace period — but next to a 391% payday APR, it's dramatically cheaper.
• An employer paycheck advance or earned-wage-access benefit. Many employers now offer some version of this at little or no cost, since it's simply an early release of money you've already earned.
• Negotiating the due date directly with the biller. Utility companies, landlords, and many creditors will grant a short extension, sometimes for a small late fee that's a fraction of a payday loan's cost, if you call before the due date rather than after.
• A local nonprofit or community assistance program. Many areas have emergency assistance funds specifically for rent, utilities, or medical costs that don't require repayment at all.

If the real issue is a thin cash cushion rather than a one-time emergency, building even a small buffer changes the whole equation going forward — see our emergency fund calculator to set a realistic savings target.

Who Actually Uses Payday Loans — and Why Timing Matters

Payday loans are marketed as a bridge for an unexpected car repair, a medical bill, or a gap between paychecks, and for a genuinely one-time emergency that gets repaid on the very next payday, the total cost — while steep — is at least contained to a single fee. The problem the CFPB's research keeps surfacing is timing: a borrower who takes a payday loan because their budget was already tight before the loan is, almost by definition, likely to still be tight two weeks later when the full balance plus fee comes due in one lump sum. That structural mismatch — a short, all-at-once repayment landing on a borrower whose cash flow was already strained — is what tends to trigger the rollover cycle rather than any individual decision made in bad faith. Understanding that pattern in advance is exactly why modeling a rollover or two in this calculator, rather than assuming a clean one-time repayment, gives a far more honest picture of what you're actually signing up for.

It's also worth knowing that not every state permits payday lending in its traditional form, and where it is permitted, state law can cap the fee, limit the number of rollovers, or require an extended repayment plan option if you ask for one. Before assuming a rollover fee is unavoidable, ask the lender directly whether your state mandates a no-cost extended payment plan — many do, and lenders aren't always the ones to volunteer that information first.

Common Mistakes to Avoid

• Comparing the dollar fee instead of the APR. "$60 to borrow $400" sounds nothing like "391% APR" — but they're the same offer. Always convert to APR before comparing loan options.
• Assuming one rollover is harmless. Each rollover adds a full new fee without reducing what you owe — two or three rollovers can mean paying more in fees than you originally borrowed.
• Skipping the credit union PAL check. Many borrowers don't realize federally chartered credit unions are required to offer small-dollar alternatives at a fraction of the cost.
• Not calling the biller first. A short extension or payment plan directly from a landlord or utility company is often free or nearly free compared with any loan.
• Borrowing more than the specific emergency requires. Every extra dollar borrowed carries the same annualized rate — borrow exactly what's needed, nothing more.
• Treating a payday loan as a routine budgeting tool. It's designed and priced as a rare, short-term bridge — using it repeatedly is the exact pattern that generates the worst outcomes.

Related Free Tools From Arb Digital

Pair this calculator with the emergency fund calculator to plan a cushion that removes the need for short-term borrowing, the debt snowball calculator if you're already carrying multiple debts, the APR calculator to compare other loan offers on equal footing, the interest rate calculator to reverse-engineer a rate from a payment quote, and the simple interest calculator for straightforward interest math. Browse everything in our free online tools hub.

Frequently Asked Questions

This tool provides general estimates for educational purposes only and is not financial, tax, legal, or medical advice. Figures are illustrative; consult a licensed professional for decisions.