🏆 Calculator

Savings goal calculator

How long until you reach your savings target?

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Enter your savings plan and click Calculate.
⚠️ For educational purposes only. Not financial advice.

How a savings goal calculator works

A savings goal calculator answers a single question: given a target amount, a starting balance, and an expected return rate, how long until I get there — and how much do I need to save each month?

It uses the future value of an annuity formula in reverse. You provide the goal (FV), starting amount (PV), expected rate (r), and time horizon (n) — the calculator solves for the monthly contribution required. Or you fix the monthly contribution and solve for time.

A worked example

You want a $40,000 house deposit in 5 years. You currently have $5,000 saved, and a high-yield savings account pays 5% per year.
Future value of $5,000 in 5 years at 5%: ~$6,381
Remaining gap: $40,000 − $6,381 = $33,619
Required monthly savings: ~$494/month

Two practical takeaways: (1) the higher the rate, the lower the monthly burden — at 1% interest the same goal would require ~$590/month. (2) Starting balance matters more for short horizons than long ones — a 5-year head start of $5,000 saves you about $96/month here.

How to choose a realistic goal

Most savings goals fall into three time-horizon buckets, each with its own appropriate vehicle and return assumption:

HorizonExamplesVehicleRealistic return
<1 yearEmergency fund, holidayHigh-yield savings4–5%
1–5 yearsHouse deposit, wedding, carTerm deposit / mixed fund4–6%
5+ yearsRetirement, kids' educationIndex fund / KiwiSaver6–8%

Important: never put short-horizon money in volatile investments. A "5% expected return" from stocks is an average over decades, not a guarantee for any specific year. House deposits parked in equities have ruined many home-buying timelines.

Tactics that work

Frequently asked questions

What rate of return should I assume for short-term savings?
For 1–3 year goals kept in a high-yield savings account or term deposit, 4–5% is realistic in the current rate environment. For longer than 3 years, you can consider mixed or growth funds with a 5–7% expected return — but accept the risk of negative years.
Should I save in a high-interest account or invest?
It depends on your time horizon. Money you need within 3 years should stay in cash or term deposits — the volatility of investments is too risky. Money you don't need for 5+ years can usually go into diversified investments for higher expected returns.
How do I save for multiple goals at once?
Prioritise: (1) emergency fund first, (2) high-interest debt next, (3) retirement contributions to capture any employer match, (4) other goals after. For other goals running in parallel, divide your monthly savings capacity proportionally to the urgency or importance of each.
What if I can't hit my target monthly amount?
Two adjustments: extend the timeline, or lower the goal. Both are valid. Extending an $40k house-deposit goal from 5 years to 7 cuts the monthly burden from ~$500 to ~$340. Sometimes the right answer is also 'no' — some goals genuinely aren't worth the trade-offs to your current quality of life.
How does inflation affect savings goals?
If your goal is in today's dollars (e.g. 'I want $40,000 in today's purchasing power'), increase the target by ~2–3% per year of the time horizon. A $40,000 goal in 10 years is really ~$53,000 in nominal terms. Keeping savings in a high-interest account that beats inflation prevents erosion.
When should I increase contributions vs. wait for higher returns?
Always prioritise increasing contributions over chasing higher returns. Doubling your monthly contribution has a much more predictable, faster impact than swapping your fund for one with a higher historical return. Higher-return options usually come with higher volatility — fine for long horizons, dangerous for short ones.
📖 How much should you invest monthly? Our guide explains the 50/30/20 rule and how to balance saving with debt.
Read the guide →