Finance Calculators
19 free calculators for investing, saving and borrowing: compound interest, NPV, IRR, CAGR, ROI, EMI, home loans, amortization and more. Each tool shows the exact formula it uses, a worked example with real numbers, and a reference table — no sign-up required.
What can you calculate with these finance tools?
These 19 calculators span the three big questions of personal finance: how money grows (compound interest, APY, CAGR, savings, Rule of 72), what an investment is worth (NPV, IRR, present value, ROI, bond yield, rental yield, annuity, net worth), and what borrowing really costs (EMI, home loan, amortization, interest-only and car lease payments). Each shows the exact formula, a worked example, and a reference table of computed values.
Why does compound interest matter so much?
Because growth accelerates over time: $10,000 at 8% compounded annually becomes about $21,589 in 10 years, $46,610 in 20 years, and $100,627 in 30 years. The Rule of 72 gives a quick estimate — money doubles roughly every 72 ÷ rate years, so about every 9 years at 8%. Small differences in rate or start date compound into large differences in outcome, which is why comparing options with a calculator beats guessing.
How should you compare a loan offer?
Look past the headline rate to the total interest paid over the full term. On a $200,000 loan at the same rate, a 15-year term costs roughly half the total interest of a 30-year term, in exchange for a higher monthly payment. The Amortization and EMI Calculators show the month-by-month split between principal and interest so you can see exactly where each payment goes.
Frequently asked questions
Simple interest is earned only on the original principal, while compound interest is earned on the principal plus all previously earned interest. Over 20 years at 8%, $10,000 earns $16,000 with simple interest but about $36,610 with annual compounding — and the gap widens every year.
EMI uses the standard formula EMI = P × r × (1+r)^n ÷ ((1+r)^n − 1), where P is the principal, r the monthly interest rate, and n the number of months. The EMI Calculator computes this instantly and shows the total interest paid over the tenure.
NPV accounts for the time value of money — it discounts future cash flows back to today before comparing them with the upfront cost, while simple ROI ignores when money arrives. A positive NPV means the investment beats your required rate of return; ROI alone cannot tell you that.
Yes — all 19 finance calculators are completely free, require no registration, and run locally in your browser. They are provided by Talcart for education and planning; for major financial decisions, verify results with a qualified advisor.