How to use it
- Enter your savings goal. This is the amount you want to reach, e.g. 20000. The currency doesn’t matter — just type the number.
- Add your current savings. Whatever you have set aside toward this goal already gives you a head start.
- Set a monthly contribution. The fixed amount you can put away each month is the main driver of how fast you arrive.
- Optionally add an interest rate. If your savings earn interest, type the annual rate as a percent, e.g. 4 for 4%. Interest is compounded monthly on the running balance.
- Read the results. The cards show the time to reach your goal, the total months, how much you contributed, and the interest earned along the way.
Everything recalculates the instant you change a number, so you can try a bigger monthly amount or a different rate and see the finish line move immediately.
How the maths works
The calculator simulates your savings month by month rather than using a single closed-form equation, which keeps it accurate and easy to reason about. Each month it first adds interest to your existing balance at one-twelfth of the annual rate, then adds your monthly contribution at the end of the month. It repeats this until the balance reaches or passes your goal, counting the months as it goes. For example, saving 400 a month on top of 5,000 already saved, with a4% rate, reaches 20,000 in roughly three years — a little sooner than with no interest, because the growing balance earns a bit extra each month.
What if the goal is out of reach?
Some combinations can never get there. If you enter no monthly contribution and no interest rate, the balance simply never changes, so the calculator shows Never rather than an impossible date. If your contributions are very small relative to a large goal, it may report that reaching it would take more than a hundred years. Both are honest signals that the plan needs adjusting — usually a higher monthly amount, a longer timeline, or a smaller target. Nudging the monthly contribution up even a little often pulls the date in by months or years thanks to the compounding effect.
Is it private?
Yes. The Savings Goal Calculator is plain JavaScript that runs entirely inside your browser tab. The goal, balances and rate you type are never uploaded, logged or stored anywhere — there are no accounts and no tracking of your inputs. Once the page has loaded you can even use it offline.
Frequently asked questions
Does it account for inflation or taxes?
No. It shows nominal growth only. The real purchasing power of your goal will be lower after inflation, and any interest may be taxable depending on where you live and the account type. Treat the timeline as a pre-tax, pre-inflation estimate.
When is each contribution counted?
Interest is applied to the running balance first, then your contribution is added at the end of the month. This is a common, slightly conservative convention, so real-world timings that deposit at the start of the month may arrive a touch sooner.
What currency does it use?
It is currency-neutral. Whatever number you enter is treated as a plain amount, so the goal, contributions and interest all come out in the same currency you typed — dollars, euros, pounds, rupees or anything else.
Results are estimates rounded for display; for real financial decisions, confirm figures with your bank or a qualified adviser.