Interest Calculator

  • Per Diem Interest Calculator
    Calculate per diem (daily) loan interest from principal and APR. PerDiem = Principal × (APR ÷ 365). See interest accrued over any number of days.
  • Loan Payment (PMT) Calculator from Present Value
    Calculate the periodic loan payment (PMT) from a present value, interest rate and term. Get total paid and total interest using the annuity formula.
  • Yield to Maturity (Approximation) Calculator
    Estimate a bond's yield to maturity (YTM) with the fast approximation formula. Enter coupon rate, face value, price, and years to maturity.
  • ACB Savings Doubling Time Calculator
    Find how many years it takes to double your savings at a given annual interest rate using the exact ln(2)/ln(1+r) formula and the Rule of 72.
  • Time to Double Your Deposit Calculator
    Find out how many years it takes to double your deposit at a given interest rate and compounding frequency using the exact compound-interest formula.
  • Rate of Return Calculator
    Calculate your rate of return (ROR) on an investment from beginning value, ending value, and income received. Get the percentage total return instantly.
  • Monthly Compound Interest Calculator
    Calculate compound interest with our Monthly Compound Interest Calculator. Input amount, rate & months for instant results. Free & accurate!
  • Mortgage Interest Calculator
    Calculate the total interest you'll pay on a mortgage. Enter loan amount, interest rate, and term to see total interest, monthly payment, and total cost.
  • Investment Calculator
    Calculate the future value of your investment with compound interest and regular contributions. See total growth, contributions, and interest earned.
  • Discount Yield Calculator
    Calculate the bank discount yield on a Treasury bill or discount security from face value, purchase price, and days to maturity (360-day basis).
  • Daily Interest (Per Diem) Calculator
    Calculate the daily (per diem) interest on a loan or balance from the principal and annual rate, plus total interest over any number of days.
  • How Much Interest Will I Earn Calculator
    Find out how much interest you'll earn on any amount with compound interest. Enter principal, rate, term and compounding frequency to see total interest.
  • Monthly Payment from APR Calculator
    Calculate your fixed monthly loan payment from the loan amount, APR, and term in months. See total interest and total of payments instantly.
  • Bond Current Yield Calculator
    Calculate a bond's current yield from its face value, annual coupon rate, and current market price. Free, instant bond yield calculator.
  • Bi-Weekly Mortgage Interest Savings Calculator
    Compare a standard monthly mortgage to a bi-weekly half-payment plan. See how much interest you save and how many years you cut off your loan.
  • Simple Interest Loan Payoff Calculator
    Calculate the total payoff amount on a simple-interest loan. Enter your principal, annual rate, and days to see accrued interest and what you owe.
  • Effective Annual Rate (EAR) Calculator
    Convert a nominal APR into the effective annual rate (EAR) using EAR = (1 + APR/m)^m − 1. Compare monthly, daily, quarterly compounding instantly.
  • Interest-Only Savings Monthly Income Calculator
    Calculate the monthly, weekly and annual income your savings can generate from interest alone, leaving the principal untouched. Free and instant.
  • Money Doubling Time Calculator
    Find how many years it takes to double your money at a given interest rate using the Rule of 72 plus the exact logarithmic formula.
  • Savings Monthly Deposit Calculator
    Find the monthly deposit needed to reach a savings goal by a target date, given an annual interest rate compounded monthly. See deposits vs interest.
  • Interest-Only Payment Calculator
    Calculate your interest-only loan or mortgage payment from the principal, annual rate, and payment frequency. Free, instant, and easy to use.
  • Rule of 70 Calculator
    Use the Rule of 70 calculator to estimate how many years (or periods) it takes for an investment, population, or value to double at a given growth rate.
  • Rule of 114 Calculator
    Use the Rule of 114 to estimate how many years it takes to triple your money at a given annual interest rate. Fast, free tripling-time calculator.
  • Growing Perpetuity Calculator
    Calculate the present value of a growing perpetuity using the Gordon Growth formula PV = C / (r − g). Enter cash flow, discount rate and growth rate.

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