Bond yield calculator
Enter a bond's face value, coupon, price and years to maturity. See its current yield and its approximate yield to maturity.
Read the noteInvesting calculators
Small tools that show the arithmetic behind the notes. Each one explains its formula and works a full example by hand, so you can check the result yourself.
Compound growth calculator
Enter a starting amount, a monthly addition, a rate and a number of years. See the ending balance and how much of it came from compounding.
Read the noteFee drag calculator
A 1% yearly fee sounds small. Enter an amount, a return, a fee and a number of years to see what it takes out of the ending balance.
Read the noteInflation-adjusted return calculator
A 6% return with 3% inflation is not a 6% gain in buying power. See the real return and a future balance in today's dollars.
Read the noteRule of 72 calculator
Divide 72 by the yearly rate to estimate doubling time. See how close the shortcut is to the exact answer at any rate.
Read the note