Finance

Finance calculators

Use these tools to model loans, investments, taxes, and budgeting decisions. Each calculator includes inputs, formulas, and a worked example.

Common formulas

• Interest = Principal × Rate × Time
• Loan payment = P × r / (1 - (1 + r)^-n)

How to choose the right calculator

Start with the goal: repayment, savings growth, or affordability. Then select the calculator that matches your scenario.