เครื่องคำนวณอัตราดอกเบี้ย

Find APR from payment and term, convert between APR and APY, calculate effective rate with fees, or compare loan rates. Get instant results.

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Choose a calculation type, enter your numbers, and click Calculate to see your interest rate, APR/APY conversion, effective rate with fees, or rate comparison.

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What is APR vs APY?

APR (Annual Percentage Rate) is the nominal rate before compounding. APY (Annual Percentage Yield) is the actual return after compounding. When interest compounds more than once per year, APY is higher than APR. This calculator finds APR from payment and term, converts between APR and APY, and shows effective rate when fees are included.

ประเภทการคำนวณ

  • ค้นหาอัตรา: Enter loan amount, monthly payment, and term to get the implied APR.
  • APR → APY: Convert a stated APR to APY for a given compounding frequency.
  • APY → APR: Convert APY back to the equivalent APR.
  • อัตราที่มีประสิทธิภาพ: Include origination fees, points, and other fees to see the true cost of the loan (effective annual rate).
  • เปรียบเทียบราคา: Enter multiple rates to compare monthly payments and total interest.

สูตรที่ใช้

APY = (1 + APR/n)^n − 1

APR = n × [(1 + APY)^(1/n) − 1]

n = compounding periods per year. Find rate uses the loan payment formula solved for rate (Newton-Raphson).

หมายเหตุสำคัญ

  • This tool is for education and estimation only. Not financial or legal advice.
  • Effective rate with fees reflects the true cost when you receive less than the full loan amount.

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