APR Calculator

Calculate APR from real cash flows (what you actually receive vs what you pay back). Fees and frequency supported.

How to Use

  1. Enter the loan amount (amount financed) and your payment details (payment amount + number of payments).
  2. Add fees (upfront and/or financed) if applicable.
  3. Pick payment frequency (monthly / biweekly / weekly).
  4. APR updates as you type. Use “Share Link” to generate a restoreable URL.

This tool treats APR as the interest rate that makes the present value of payments equal to the net amount you actually receive.

APR Summary
Computed from cash flows (IRR). Values shown are estimates based on inputs.
APR
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Periodic Rate
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Net Received
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Total Paid
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Signal: —
Tip: APR is not always the same as the “nominal” interest rate. Fees can materially change APR.
Inputs
Enter payment schedule + fees. The solver computes the APR that matches your cash flows.
Principal / amount financed (before fees adjustments).
Your scheduled payment per period (monthly/weekly/etc.).
Total count of payments you’ll make.
Frequency determines the “periodic rate” used to build APR.
Subtracted from what you actually receive (net proceeds).
Added to amount financed (affects payments/true cost in some deals).
If enabled, this shifts the first cash flow by N days.
Show Work (step-by-step)
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Work shows the cash-flow setup and the solved periodic rate that produces the APR.

APR Reference

APR is the annualized rate implied by your actual cash flows: the net amount you receive at origination (after upfront fees) versus the payments you make over time.

  • Net received ≈ amount financed − upfront fees (plus/minus any financed-fee logic your deal uses).
  • Total paid = payment amount × number of payments.
  • Periodic rate is solved so present value of payments equals net received.
  • APR is derived from periodic rate and frequency (12/26/52).
Note: Lenders may compute APR using specific regulatory rules; this calculator provides a transparent cash-flow-based estimate.

FAQ

Why is APR higher than my interest rate?

APR can include the effect of fees and timing. Upfront fees reduce what you actually receive, which increases the implied rate.

What if I don’t know the interest rate?

You don’t need it here—enter what you receive and what you pay. The calculator solves the implied APR.

Does payment frequency matter?

Yes. Monthly vs biweekly changes the number of periods per year and the timing of cash flows, which changes APR.

Is this the same as effective annual rate (EAR)?

Not always. APR is typically an annualized rate derived from periodic cash-flow rates; EAR depends on compounding assumptions.

Tool Info

Last updated:

Updates may include improved cash-flow handling, better edge-case validation, and additional fee/timing options.