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Emergency fund calculator
How much of a safety net do you actually need, and how long until you've built it? Work out your 3 to 6 month buffer from your real essential spending.
Rent or mortgage, food, power, transport, insurance, minimum debt payments. Not the fun stuff.
An emergency fund is a cash buffer for the unexpected: a job loss, a car repair, a vet bill. Most guidance is 3 to 6 months of essential spending, kept somewhere you can reach it quickly.
Enter your essential monthly spending to see how big your emergency fund should be, and how long it'll take to build.
How much emergency fund do you need?
An emergency fund is a stash of cash for life's curveballs: a redundancy, a car that won't start, an unexpected vet or dental bill. Its job is to keep the lights on while your income is disrupted, so you don't reach for a credit card or a high-interest loan.
Because it covers your outgoings, you size it on your essential monthly spending, not your income. The widely used range is 3 to 6 months:
- 3 months is a solid baseline for most people with stable, salaried work.
- 6 months (or more) suits variable income, the self-employed, single-income households, or roles that would take a while to replace.
Build it somewhere separate from your day-to-day account so it isn't nibbled away, but keep it easy to reach: an on-call savings account, not a locked-in term deposit. Start small if you need to. A first $1,000 buffer already takes the sting out of most minor emergencies.
Emergency fund questions, answered
- How much should my emergency fund be?
- The common rule of thumb is 3 to 6 months of essential spending. Three months is a solid starting buffer; six months suits you better if your income is variable, you're self-employed, you're a single-income household, or your job would be slow to replace.
- What counts as 'essential' spending?
- The things you'd still have to pay if your income stopped: rent or mortgage, food, power and water, transport, insurance, and minimum debt repayments. Leave out the discretionary spending (eating out, subscriptions, holidays) you could pause in a pinch. A smaller, honest essentials figure gives a realistic target.
- Why base it on expenses, not income?
- An emergency fund exists to cover your outgoings while your income is disrupted, so it's sized on what you spend, not what you earn. Two people on the same salary can need very different funds depending on their fixed costs.
- Where should I keep my emergency fund?
- Somewhere separate from your everyday account so it isn't spent by accident, but still easy to reach the day you need it: an on-call or notice savings account works well. The point is quick access, not the highest return, so it's usually not the place for locked-in term deposits or investments.
- Should I build an emergency fund or pay off debt first?
- A common approach is to save a small starter buffer (say $1,000, or a few weeks of essentials) first, then throw everything at high-interest debt like credit cards, and build the full 3 to 6 month fund once that's cleared. It's a personal call, and this tool just sizes the fund itself.
- How long will it take to save?
- That depends on the gap and how much you can put aside. Enter a regular amount and this calculator estimates the whole number of months to reach both the 3 and 6 month targets at that rate.
- Does this calculator include interest on my savings?
- No, on purpose. Emergency money is kept liquid and low-risk, so any interest is small and we don't want to overstate how fast the fund grows. The estimate is based purely on what you set aside.
Know your number, then hit it.
KeaBudgetis the free budget app for Kiwi bank accounts. Set an emergency-fund goal and watch it fill up each payday. It's live now, and free.
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Savings Goal Planner →Debt Payoff Calculator →Related reading: Emergency funds in NZ: how much, where to keep it, how to build it.