Investment Calculator

Project investment growth or solve for starting amount, return rate, contribution, or years to a goal.

Investment Calculator helps you solve for end balance, starting amount, return rate, contribution, or time horizon. Enter target / end balance, starting amount, monthly contribution, expected annual return, and years invested, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Investment calculator does Investment Calculator is built for money decisions — loans, savings, payments, and taxes. Solve for end balance, starting amount, return rate, contribution, or time horizon. You enter target / end balance, starting amount, monthly contribution, expected annual return, and years invested, then Simple Calculators computes the result instantly. Rates, fees, and tax rules vary by lender and country, so treat results as planning numbers, not a contract. How the math works Uses monthly compounding with an ordinary annuity of contributions. Each solve mode rearranges the same future-value equation. The formula: FV = P × (1 + r ÷ 12)^(12t) + D × ((1 + r ÷ 12)^(12t) − 1) ÷ (r ÷ 12). P is the starting amount, D is the monthly contribution, r is the yearly return, and t is years. The other modes rearrange this to find P, r, D, …