Personal Finance
Calculators & Tools
72/90 Rule Money Calculator
The Rule of 72 estimates how many years it takes to double money at a fixed annual return: divide 72 by the interest rate. At 7%, money doubles in approximately 10.3 years. The Rule of 90 applies the same logic to tripling: divide 90 by the rate. Both rules are accurate to within one year for interest rates between 5% and 12%.
Debt-to-Income Ratio Calculator
The Debt-to-Income Ratio Calculator measures the percentage of your gross monthly income that goes toward debt payments. It calculates both your front-end DTI (housing costs only) and back-end DTI (all monthly debts). Use it to check mortgage eligibility, plan debt payoff, or benchmark your financial health before applying for credit.