Interest & APR Calculators
Simple and compound interest, APR and rates. Instant result with breakdown, formula and payment schedule. Free financial calculator.
Annual percentage rate and interest calculations form the backbone of every lending and savings decision. These tools help you compare APR versus APY, calculate compound interest over any period, estimate certificate of deposit returns, and understand how compounding frequency affects your real earnings or borrowing costs.
All Interest & APR Calculators
Simple Interest Calculator
Calculate I = Prt and A = P(1 + rt). Instant result with amortization table, formula and chart. Free financial calculator.
Compound Interest
Calculate compound interest with any frequency. Instant result with amortization table, formula and chart. Free financial calculator.
APR Calculator
Annual Percentage Rate calculation. Instant result with amortization table, formula and chart. Free financial calculator.
Effective Annual Rate
Calculate the Effective Annual Rate (EAR) from nominal rate and compounding frequency. Enter your values — see EAR and the compounding effect. Free.
Effective Interest Rate
Convert nominal to effective rate. Instant result with breakdown, formula and payment schedule. Free financial calculator.
Nominal Interest Rate
Calculate nominal interest rate. Instant result with breakdown, formula and payment schedule. Free financial calculator.
Periodic Interest Rate
Convert annual rate to periodic rate. Instant result with breakdown, formula and payment schedule. Free financial calculator.
Daily Interest Calculator
Calculate interest for daily compounding periods. Enter principal, annual rate, and days — see daily interest and total accrued. Free.
Monthly Interest Calculator
Calculate interest for monthly compounding periods. Enter principal, annual rate, and months — see monthly interest and total. Free.
APR to APY Converter
Convert APR to APY for accurate return comparison. Enter APR and compounding frequency — see APY with compounding effect shown. Free.
Daily Compound Interest Calculator
Calculate compound interest on a daily basis. Enter principal, annual rate, and period — see daily compounding growth and total. Free.
Rule of 114 Calculator
Find how many years to triple your money. Enter your interest rate — see years to triple using the Rule of 114 (114/r). Free.
Real Interest Rate Calculator
Calculate the real (inflation-adjusted) interest rate. Enter nominal rate and inflation — see real rate using the Fisher equation. Free.
Fisher Effect Calculator
Calculate the Fisher effect relationship. Enter nominal rate and inflation — see real interest rate with Fisher equation. Free.
Inflation-Adjusted Return Calculator
Calculate real investment returns after inflation. Enter nominal return and inflation rate — see real return and purchasing power. Free.