Emergency fund duration calculator

How Long Would Your Savings Last in a Crisis?

An emergency fund exists to cover expenses when income stops. Estimating how many days, weeks, and months your current savings would sustain you — and at what daily burn rate — makes the concept of emergency preparedness concrete.

Calculating Survival Runway

This calculator divides your total liquid savings by your net monthly expenses (after any partial income replacement) to show your survival runway in multiple time units. It also shows the daily burn rate to help you see your financial situation in granular terms.

Building Your Buffer

A common guideline suggests 3–6 months of expenses as an emergency fund target. This tool shows how far your current savings would stretch and how far from that target you may be. Results are estimates based on constant monthly expenses.

What People Often Overlook

Many people find that their estimate of monthly expenses is lower than the reality. It can help to go through recent bank statements rather than working from memory — subscriptions, irregular bills, and small daily costs add up quickly. Another thing worth considering is partial income. If redundancy pay or universal credit would cover even a portion of your outgoings, your runway extends meaningfully. Factoring that in gives a more realistic picture than assuming zero income from day one.

Why Seeing It as a Daily Figure Helps

Thinking in months can feel abstract. Knowing your daily burn rate makes the situation feel tangible. One approach is to compare that figure against small discretionary spending — it reframes decisions without judgement. This is simply about clarity, not guilt.

Quick example

With total liquid savings of 10,000 and monthly essential expenses of 3,000 (plus monthly partial income of 0), the result is 101 days. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.

Which inputs matter most

You enter Total Liquid Savings, Monthly Essential Expenses, and Monthly Partial Income (unemployment, etc.). Not every input has equal weight. Flip one at a time toward extreme values to feel which ones move the needle most for your situation.

What's happening under the hood

This calculator divides total savings by the monthly shortfall (expenses minus income) to estimate financial runway in months. It assumes constant monthly expenses and income with no changes, investment returns, or additional savings. Results represent an illustration of how long savings might last under these static conditions. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.

What to do with the result

The figure is deliberately confronting. Don't overreact — a large total doesn't mean the behaviour is wrong, just that it's expensive over a lifetime. Use the number as a prompt to check whether the spending still reflects what you value.

What this doesn't capture

This is an illustration, not a prediction. The specific figure depends entirely on your inputs — change any assumption and the headline moves. The value is in the pattern it reveals, not the exact pound figure.