Payday Loan Cost Calculator

The True Cost of Payday Loans

Introduction

Payday loans are small, short-term cash advances that are usually meant to be repaid on the borrower’s next payday. Because the loan term is so short, the fee can look manageable at first glance. A charge such as $15 for every $100 borrowed may not sound dramatic when viewed as a flat dollar amount. The problem is that this fee is being paid over only a few days or a couple of weeks. When that same cost is converted into an annual percentage rate, or APR, the result is often several hundred percent.

This calculator is designed to make that cost easier to see. It estimates the fee charged on the loan, the total amount that must be repaid, and the equivalent APR based on the loan amount, the fee per $100 borrowed, and the number of days until repayment. The goal is not just to produce a number, but to help you compare a payday loan with other forms of borrowing such as a credit card, a personal loan, a payment plan from a service provider, or a small-dollar loan from a credit union.

Seeing the annualized cost can be eye-opening. A payday loan may be marketed as a quick solution for rent, utilities, car repairs, or emergency bills, but the short repayment window can make the effective borrowing cost extremely high. This page explains what the calculator does, how to use it, how the formula works, and what the result can and cannot tell you.

How to Use

Using the calculator is straightforward. Start by entering the loan amount, which is the amount of cash you receive before fees are added. Next, enter the fee per $100 borrowed. This is the common way payday lenders describe pricing. For example, if the lender charges $15 for every $100 borrowed, enter 15. Finally, enter the loan term in days, which is the number of days from the date you receive the loan until the date the full balance is due.

After you run the calculation, the tool returns two main outputs. The first is Total Repayment, which is the original loan amount plus the fee. The second is Equivalent APR, which converts the short-term fee into an annualized rate so you can compare it with other credit products. This annualized figure is especially useful because a flat fee can hide how expensive the loan really is when the repayment period is very short.

When entering values, keep the units consistent. The loan amount and fee are in dollars, while the term is in days. If your lender quotes a fee in another format, such as a total finance charge instead of a fee per $100, you may need to convert it first. For example, a $45 fee on a $300 loan is the same as $15 per $100 borrowed because $45 divided by 3 equals $15.

The calculator works best for a single payday loan period with one fee and one repayment date. It is intended as a quick educational estimate, not a legal disclosure or a substitute for the lender’s contract. If your loan includes extra charges, late fees, rollover fees, or installment payments, the actual cost may be higher than the estimate shown here.

Formula

The calculator uses two simple ideas. First, it computes the fee based on the lender’s charge per $100 borrowed. Second, it annualizes that fee to estimate an APR. The total repayment amount is the principal plus the fee. The APR is found by dividing the fee by the principal, scaling that rate to a 365-day year, and then converting it to a percentage.

In MathML, the equivalent APR $r$ is expressed as:

where $F$ is the fee, $P$ is the principal or amount borrowed, and $D$ is the loan term in days. The total repayment can be described in plain language as principal plus fee. If you want to think about the fee itself, the calculator determines it by multiplying the fee-per-$100 figure by the number of hundreds in the loan amount.

This structure explains why payday loan APRs can be so high. Even if the fee is only a modest fraction of the amount borrowed, the annualization step multiplies that cost across many short loan periods in a year. A fee that seems small over 7, 10, or 14 days becomes very large when projected over 365 days. That does not mean you will literally keep the same loan for a full year, but it does provide a standardized way to compare borrowing costs.

Worked Example

Suppose you borrow $300 and the lender charges $15 per $100 borrowed for a 14-day term. Because $300 contains three groups of $100, the fee is 3 × $15 = $45. The total repayment is therefore $300 + $45 = $345. That is the amount due on the repayment date if the loan is paid on time and no extra charges are added.

Now look at the APR. The fee is $45 on a $300 principal, so the periodic cost is 45 ÷ 300 = 0.15, or 15% for 14 days. To annualize that rate, multiply by 365 ÷ 14. The result is about 3.9107, and converting to a percentage gives an APR of about 391.1%. This is why payday loans are often described as extremely expensive, even when the fee appears modest in dollar terms.

Here are a few common comparisons that show how the term and fee affect the annualized rate:

These examples show two important patterns. First, a higher fee pushes the APR up quickly. Second, a shorter term also pushes the APR up because the same fee is being paid over fewer days. That is why a one- or two-week payday loan can produce a triple-digit APR even when the fee is stated as a flat amount rather than as interest.

Interpreting the Result

The total repayment figure tells you the immediate cash obligation you will face on the due date. This matters because many borrowers take payday loans during a cash shortage, and repaying the full amount in one lump sum can create another shortfall. If the total due is difficult to cover from your next paycheck, the loan may increase financial pressure rather than relieve it.

The APR figure is best used as a comparison tool. It helps answer the question, “How expensive is this loan compared with other credit options?” A credit card APR of 20% or even 30% is far below the annualized cost of many payday loans. That does not automatically mean another option is available or appropriate, but it does show the scale of the difference. The calculator makes that difference visible in a standardized format.

It is also useful to think beyond a single loan cycle. If a borrower cannot repay the full amount and instead renews, rolls over, or replaces the loan with another similar loan, the total fees paid can rise quickly. For example, a $45 fee repeated several times can add up to a large share of the original amount borrowed. In practice, repeated borrowing is one of the main reasons payday loans can become so costly.

Limitations and Assumptions

This calculator makes a simplified estimate. It assumes a single payday loan with one fee structure, one principal amount, and one repayment date. It does not include late fees, returned payment charges, rollover fees, collection costs, installment restructuring, or state-specific regulatory rules. If your loan agreement includes any of those features, the actual cost may differ from the result shown here.

The APR shown is an equivalent annualized rate based on the standard formula above. It is useful for comparison, but it does not mean you will necessarily keep the loan for a full year or pay the same fee repeatedly under identical terms. Annualization is simply a way to express short-term borrowing costs on the same scale used for other financial products.

Another limitation is that payday lending laws vary by state and country. Some jurisdictions cap fees or APRs, some restrict rollovers, and some prohibit payday lending entirely. This page does not attempt to apply local legal rules automatically. You should review the lender’s disclosures and your local consumer protection laws before relying on any estimate.

Finally, the calculator does not judge whether a payday loan is right or wrong for your situation. It is an educational tool that helps you see the numbers clearly. In many cases, alternatives such as negotiating a payment extension, asking a utility provider for a plan, seeking help from a nonprofit assistance program, using a lower-cost line of credit, or borrowing from a credit union may be less expensive. The value of the calculator is that it gives you a transparent starting point for that comparison.

Practical Context

Many people turn to payday loans because they need money quickly and feel they have few choices. Approval may depend more on proof of income than on a traditional credit check, which can make these loans accessible when other credit is not. That convenience, however, often comes with a very high price. By converting the fee into an APR and showing the total repayment amount, this calculator helps you slow down and evaluate the tradeoff between speed and cost.

Budgeting and emergency planning can also change the picture over time. Even a small emergency fund can reduce the need for high-cost short-term borrowing. If this calculator shows that a short loan would cost far more than expected, that information can support a decision to look for a payment arrangement, community assistance, or another source of funds before committing to the loan. In that sense, the calculator is not just about arithmetic. It is about making the cost visible enough to support a more informed financial decision.