Investment & Returns Calculators

Investment decisions involve more variables than almost any other area of personal finance, and small differences in assumed return rate, time horizon, or contribution schedule produce dramatically different outcomes over decades. These calculators help you model those outcomes with your actual numbers rather than abstract percentages.

The compound interest calculator is the foundation of investment math. Enter a starting amount, a regular contribution, an expected return rate, and a time horizon, and it shows you how the balance grows year by year — including the portion attributable to contributions versus the portion generated by compounding. This is the calculator most useful for understanding why starting early has such a disproportionate impact on long-term wealth.

The ROI calculator takes the inverse approach: given a known cost and known return, it computes the percentage gain or loss and annualizes it so you can compare investments of different durations on an equal footing. It is useful for evaluating completed investments, comparing two past decisions, or setting a minimum return threshold for future ones.

Break-even analysis answers the business side of investment decisions: how many units must you sell, or how much revenue must you generate, before a venture covers its costs. The break-even calculator applies this to fixed costs, variable costs, and price per unit.

The inflation calculator shows the purchasing power loss of money sitting idle, which is the hidden cost of not investing. The net worth calculator consolidates your full financial picture across assets and liabilities. Finally, the debt payoff vs. invest calculator addresses the most common dilemma in personal finance: when you have extra cash, is it better to pay down debt or deploy that money in the market? The answer depends on the interest rate on your debt relative to your expected investment return — and this calculator runs that comparison explicitly.