Savings Goal Calculator
Plan your savings goal — see how your savings grow over time with monthly contributions and expected returns.
Savings Growth
Contribution Scenarios
How It Works
The Savings Goal Calculator solves the inverse problem of an investment calculator: given a target amount, a starting balance, a monthly contribution, and an expected annual return, how long will it take to reach the goal? The tool simulates monthly compounding and contributions, finds the first month at which the balance crosses the target, and reports the total months (and equivalent years) needed — along with how much you will have contributed and how much of the goal came from interest. An interactive chart plots the balance growing month by month toward the target line, so you can see how compounding accelerates progress in the later years. Adjust any input to see immediately how a higher contribution, a better rate, or a more modest goal moves the timeline. The model uses the same monthly compounding convention as the investment calculator, with contributions applied at the start of each month, matching standard brokerage statements. Everything runs in your browser; the numbers you enter are not stored or transmitted.
Worked Example
Say you want $30,000 for a home deposit in 36 months and already have $5,000 earning 4% APY. Switch to by-date mode and the calculator reports a required contribution of about $638 per month. Your existing $5,000 quietly grows to roughly $5,636 on its own — the projection chart shows both lines, so you can see how much of the goal your starting balance covers. Add an inflation rate and the tool also shows the inflation-adjusted goal, revealing how much more you would need for the same real purchasing power.
Use Cases
- Planning how long it takes to save for a house deposit
- Working out what monthly saving is needed to fund a holiday or purchase
- Comparing the effect of a higher interest rate on reaching a goal faster
- Teaching compound interest with a concrete personal savings scenario
Frequently Asked Questions
- Does the tool tell me what monthly contribution I need?
- Implicitly: try different contributions and watch the time-to-goal change. For an explicit solver, you can also flip the math — the time-value-of-money formula is symmetric.
- What rate of return is realistic?
- A diversified portfolio has historically returned 6–8% nominal long-term. For short-horizon savings (under 3 years), a high-yield savings rate of 4–5% is more realistic.
- Is the goal in nominal or real money?
- Nominal. If your goal is in today's purchasing power and the horizon is long, increase the goal by the expected inflation.
- What happens if I never hit the goal?
- The tool warns when the projected balance does not reach the target within a reasonable horizon — usually meaning the contribution or rate is too low.
- Are my numbers sent anywhere?
- No. The simulation runs in your browser only.