How the monthly amount is calculated
First, your current savings are projected forward at your interest rate: money you already have keeps growing on its own. The remaining gap to your target is then divided across your monthly deposits, each of which also earns interest from the month it is made. The result is the level monthly payment that lands exactly on target.
Because both your existing savings and every new deposit compound, the required monthly amount is often pleasantly smaller than target divided by months. The longer the runway, the bigger that discount.
Set the right target
For an emergency fund, a common guideline is 3 to 6 months of essential expenses. For a home down payment, aim for 20% of the property price plus transaction costs. For education or travel, add expected inflation to today's price: a course costing 50,000 today at 6% education inflation costs about 67,000 in five years.
Where to keep goal savings
Match the vehicle to the deadline. Goals under 2 years belong in savings accounts or short deposits where the value cannot dip. Three to five year goals suit conservative hybrid options. Only genuinely long-term goals should ride equity market volatility.
Frequently asked questions
What interest rate should I use?
Use the rate of wherever the money will actually sit: roughly 3 to 7% for savings accounts and deposits, more if you are investing for a long-dated goal. When in doubt, use a lower rate and enjoy the buffer.
What if I cannot afford the monthly amount shown?
You have three dials: extend the deadline, lower the target, or earn a higher return (accepting more risk). Even a small deadline extension often reduces the monthly figure noticeably.
Should I save monthly or whenever I can?
Automatic monthly saving on payday succeeds far more often than ad-hoc saving, because it happens before spending gets the chance. Treat the monthly figure as a bill you owe your future self.
Does the calculation account for inflation?
It reaches the target in nominal terms. For goals more than a few years out, inflate the target first: multiply today's cost by (1 + inflation)^years to keep its purchasing power.
Is my existing savings counted?
Yes. Your current savings are projected forward at the same interest rate, and the monthly amount only needs to cover what growth of existing savings will not.
What if interest rates change along the way?
Revisit the calculator once a year with your updated balance, rate and remaining time. Course corrections are normal; the habit of checking is what keeps goals on track.