Finance

Free Finance & Business Calculators — ROI, Compound Interest, Mortgage

120+ free financial calculators for loans, investments, business metrics, real estate, and salary calculations.

Financial Planning Made Simple

From compound interest to mortgage affordability, ToolBox gives you 120+ financial calculators that help you make smarter money decisions.

Loans & Banking

Monthly payment calculator, loan amortization summary, debt payoff timeline, debt-to-income ratio, savings goal, and emergency fund calculators.

Investment

Compound interest (monthly), CAGR, future/present value, real return (after inflation), retirement savings, dollar cost averaging, dividend yield, and P/E ratio calculators.

Business Metrics

Break-even analysis, gross/net margin, ROI, payback period, burn rate, CAC, CLV, churn rate, MRR, ARR, LTV:CAC ratio, and depreciation calculators. Essential for founders and operators.

Real Estate

Rental yield, cap rate, rent vs buy ratio, property tax, and mortgage affordability calculators.

Tax & Salary

Hourly-to-annual salary, annual-to-hourly rate, take-home pay, overtime, freelance rate, sales tax, VAT, tip, and discount calculators.