Interest calculators reveal exactly how much your money grows — or costs — over time. Run the Compound Interest Calculator to watch returns build year over year, use the Simple Interest Calculator for straightforward loan estimates, check the Daily Interest Calculator for short-term costs, or discover what a credit card balance is really costing you each month with the Credit Card Interest Calculator.
Browse the Most Popular list to find the tools most savers and borrowers rely on, or switch to the Trending tab to see what is resonating this week. Every calculator is free, no login needed, and runs on any device.
- Tax Calculator
- Loan Calculator
- Interest Calculator
- Margin Calculator
- Salary Calculator
- Savings Calculator
- Payment Calculator
- Income Calculator
- Inflation Calculator
- Credit Card Calculator
- Deposit Calculator
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Discount Factor (Present Value of $1) Table CreatorCalculate your fixed monthly mortgage payment, total interest, and full amortization breakdown from loan amount, interest rate, and term.
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Savings Account vs CD CalculatorCalculate your Certificate of Deposit's value at maturity, total interest earned, and effective APY using compound interest. Free CD vs savings calculator.
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Compound Interest CalculatorEnter principal, annual rate, years, and compounding (annual to daily) to get final amount and total interest earned—plan your savings growth.
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Effective Annual Rate (EAR) CalculatorCalculate the Effective Annual Rate (EAR) from a nominal rate and compounding frequency. See the true yearly interest cost or yield with EAR = (1 + i/n)^n − 1.
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Simple Interest Calculator (I = Prt)Solve the simple interest formula I = Prt for interest, principal, rate or time. Choose day-count basis (360 or 365), weeks, months, quarters or years.
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APR Calculator (Loan with Fees)Estimate a loan's APR by folding upfront fees and total interest into one annual percentage rate. Free, fast, simplified add-on APR calculator.
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Break-Even Interest Rate CalculatorCompare taxable vs tax-free yields. Find the taxable equivalent yield a taxable bond must earn to beat a tax-free municipal bond at your tax rate.
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Implied Interest Rate CalculatorFind the implied compound interest rate from a start value, end value, and number of periods using r = (A/P)^(1/n) − 1. Free and instant.
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Annual Percentage Yield (APY) CalculatorCalculate APY (Annual Percentage Yield) from a nominal rate and compounding frequency. See your true effective annual return with the formula APY = (1 + r/n)^n − 1.
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Recurring Savings Calculator with Tax on Each CompoundingJapan-style recurring deposit calculator that withholds tax (default 20.315%) on interest at every compounding period. Get a full schedule and maturity total.
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Future Value Calculator with ContributionsCalculate the future value of an investment with an initial principal plus regular monthly, quarterly or annual contributions and compound interest.
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Present & Future Value Algebra CalculatorSolve for present value or future value using FV = PV(1+r)ⁿ. Enter amount, rate per period, and number of periods to get instant results.
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Solve Compound Interest for Rate or TimeSolve the compound interest formula for the unknown interest rate or time. Enter principal, future amount and compounding frequency to find r or t.
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Effective Annual Rate (APY) CalculatorConvert a nominal annual interest rate into the effective annual rate (APY) using the compounding formula APY = (1 + r/n)^n − 1.
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Continuous Compound Interest CalculatorCalculate continuous compound interest with the formula A = Pe^(rt). Find the future value and total interest from principal, rate, and time instantly.
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Simple Interest Percentage (Rate) CalculatorFind the simple interest rate as a percentage from principal, interest earned, and time. Rate = (I / (P x T)) x 100. Free, instant, accurate.
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Savings Growth with Regular Contributions CalculatorProject the future value of your savings with an initial balance plus regular monthly, quarterly or annual contributions and compound interest.
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Required Interest Rate CalculatorFind the interest rate you need to grow a present sum into a target amount over a set number of periods using r = (FV/PV)^(1/n) − 1.
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ACB Term Deposit Maturity CalculatorCalculate the maturity value and simple interest earned on an ACB term deposit from your principal, annual rate, and term in months.
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Compound Interest with Monthly Deposits CalculatorCalculate the future value of an investment with an initial deposit plus regular monthly contributions, using monthly compound interest. Free and instant.
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EMI CalculatorCalculate your loan EMI (Equated Monthly Installment) instantly. Enter loan amount, interest rate and tenure to see monthly payment, total interest and cost.
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Flat vs Reducing Interest Rate CalculatorCompare flat vs reducing balance interest. Convert a quoted flat rate to its true effective reducing-balance rate, and compare EMI and total interest.
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Daily Simple Interest Loan CalculatorCalculate daily simple interest on a loan. Enter principal, annual rate and days to see daily interest, total interest accrued, and full payoff amount.
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APY (Effective Annual Yield) CalculatorCalculate APY (effective annual yield) from a nominal interest rate and compounding frequency. See the true yearly return with compounding included.
Frequently asked questions
What is the difference between simple and compound interest, and can I calculate both here?
Simple interest is applied only to the original principal; compound interest grows on accumulated interest too, making balances expand faster over time. Both are covered — the Simple Interest Calculator handles straightforward scenarios, while the Compound Interest and Reverse Compound Interest calculators model long-term growth.
How accurate are these interest calculators?
All tools apply standard, well-established interest formulas. Results are accurate estimates for financial planning. These calculators are not financial advice — actual rates and fees vary by lender and product. Consult a qualified financial professional before making significant borrowing or investment decisions.
Are the calculators free?
Yes. Every interest calculator on this page is free with no account needed. Enter your principal, rate, and time period — results appear instantly on any phone, tablet, or computer.
Do you store my financial inputs?
No. All calculations happen locally in your browser. Your principal amounts, interest rates, and personal finance data are never transmitted to or stored on our servers.
Which interest calculators do people use most?
The default list ranks tools by real-world usage. The Compound Interest Calculator and Loan Interest Calculator consistently appear near the top. Use the Trending tab to see which tools are gaining the most traction right now.
