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How to use the calculator
Enter Essential costs per month: only what you'd still have to pay if your income stopped. Housing, bills, groceries, transport and minimum debt payments. Leave out eating out, hobbies and investing.
Under How steady is your income? choose Very steady (3 months), Normal job (6 months) or Irregular or self-employed (9 months). Be honest about how long it would take you to replace your income.
Enter what you have Already saved for emergencies. Count only money you could reach within a day or two without selling investments.
Enter what You can add per month. The household budget calculator's emergency fund slider is a good place to find this number.
Read the target, how many months you already have covered, and the time to reach the goal. If it's years away, aim for the first month of essentials first.
What it's good for
Gives you one clear number instead of a vague "I should save more".
Shows progress in months of safety, which is what actually matters when something goes wrong.
A finish date makes the goal feel reachable, and tells you when the monthly amount can move on to investing.
Where it falls short
3, 6 and 9 months are rules of thumb. Your real need depends on your job market, health, family and insurance.
It assumes your essential costs stay the same. Prices rise, so check the number once a year.
It doesn't include interest on the savings, which slightly shortens the time to the goal.
It can't decide where to keep the money. That choice (separate, accessible, not invested) is up to you.
An emergency fund is money you keep only for real surprises: losing a job, a medical bill, a car that dies, a boiler that breaks in January. Without it, every surprise becomes debt, or forces you to sell investments right when they're down. With it, a bad month stays a bad month instead of turning into a bad year.
How big should it be?
Common guidance is 3 to 6 months of essential costs. This calculator uses 3 months for a very steady income (two earners, secure jobs), 6 for a normal job, and 9 if your income is irregular, you're self-employed, or one salary carries the household. These are rules of thumb; pick the setting that matches how long it would really take you to replace your income.
Where to keep it
Separate from your everyday account, so it doesn't slowly get spent.
Easy to reach within a day or two, but not one tap away from your card.
Not in the stock market. Emergencies and market crashes like to arrive together. This money's job is to be there, not to grow.
How to build it without pain
Build it in steps. One month of essentials first, which already removes most panic, then keep going. Automate a fixed amount on payday, and when you do have to use it, refill it before restarting anything else. Once it's full, the same monthly amount can move to investing, and the habit is already there.
Questions
Should I pay off debt or build the fund first?
A common approach is a small starter cushion (about one month) first, then attack expensive debt like credit cards, then finish the fund. Without any cushion, the next surprise just goes back on the card.
Does it count if it's in a savings account with interest?
Yes, as long as you can get it out quickly and its value doesn't swing. Interest is a bonus, not the point.
Where does the "essential costs" number come from?
Add up the needs in the household budget calculator: housing, bills, groceries, transport and minimum debt payments.
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Sources · last checked
Formula: see "How it's calculated" above; tested against the worked example shown there.
Last reviewed
Education, not advice. I'm not a financial adviser and I don't know your situation. These tools show the maths behind common rules of thumb; check important decisions with a qualified professional. Full disclaimer.
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