How to Calculate a Savings Goal
A savings goal becomes easier to plan when you translate the target, starting balance, time horizon, and expected return into a regular contribution.
How the math works
Reaching a savings target by a deadline is solved as the reverse of a compound-growth calculation: instead of asking what a contribution grows into, it asks what contribution is required, given a starting balance, rate, and time, to land exactly on the target.
Worked example
To reach $20,000 in 4 years starting from $2,000, at a 4% annual rate, requires saving about $359/month. Starting from $0 instead of $2,000 raises that to about $383/month — the existing balance does less work than it might seem over a short horizon.
What to watch for
- A short deadline forces a large monthly contribution — the tradeoff is often more visible than the rate assumption
- The result depends heavily on the assumed rate; a 0% assumption is a safe, conservative starting point
- Irregular contributions don't compound as evenly as steady monthly ones — treat the number as a target, not a guarantee
Practical takeaway
If the required monthly contribution feels unrealistic, adjust the timeline before assuming a higher return will close the gap — return assumptions are the least controllable variable.