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Reaching a specific savings target by a certain date depends on three variables working together: your starting balance, your monthly contribution, and your expected rate of return. This calculator solves for whichever piece you need — how long a given monthly amount will take to hit your goal, or how much you need to save monthly to hit a fixed deadline — using standard compound-growth math rather than simple division.

How it's calculated

The future value of a savings plan is FV = P(1+r)^t + PMT × [((1+r)^t − 1) / r], where P is your starting balance, PMT is the monthly contribution, r is the periodic (monthly) return, and t is the number of periods. Solving this for time or for the required payment (rather than just dividing goal ÷ monthly amount) is what makes the projection realistic — ignoring compounding significantly overstates how long it will take, especially over longer horizons.

Why it matters

A common mistake is calculating "months to goal" with simple division (goal ÷ monthly savings), which ignores investment growth entirely and can overstate the time needed by years on a longer-term goal, since it treats every contributed dollar as earning zero return. Solving properly for the required monthly contribution also reveals how much earlier compounding lets you either hit the same goal, or reduce the monthly amount needed for the same deadline.

Common pitfalls

Assuming a constant, smooth rate of return is the biggest simplification — real markets have volatile years, and a goal with a short deadline (under 3-5 years) is especially exposed to a bad sequence of returns right before you need the money, which is why shorter-horizon goals are often better held in lower-volatility assets rather than assuming the same average return as a multi-decade retirement portfolio.