Emergency Fund Calculator — How Much Do You Need

What the fund is for

An emergency fund is cash set aside to cover essential expenses when income stops or an unplanned cost lands. It is the first redundancy layer in a money system — the buffer that keeps a bad month from becoming a debt spiral or a forced sale of investments. Size it to essentials you cannot pause (housing, utilities, food, transport, insurance, minimum debt payments), not your full budget. Enter your essential monthly expenses and the months of coverage you want in the calculator to get a target.

Three to six months, and where to hold it

Three to six months of essential expenses is the range most often cited. More fragile income — a single household earner, variable pay, self-employment, dependents — points toward the higher end; more resilient income allows the lower end. Hold the fund in a high-yield savings or money-market account where the principal is stable and you can reach it within days, not in the market. For where to hold it, compare the best high-yield savings rates; for where it sits alongside cash and growth, read the redundancy-first money framework.

Frequently asked

How much emergency fund do I need?

A widely cited range is three to six months of essential monthly expenses, held in an accessible account where the principal does not fluctuate. Three months is a common starting target and six months is common for people who want more buffer. The right figure inside that range depends on how stable your income is, whether you have a second income, dependents, and how large your fixed costs are. Multiply your essential monthly expenses by the number of months you choose to get the target. This is educational only and not financial advice.

What expenses should the emergency fund cover?

Size the fund to your essential expenses, not your total spending. Essentials are the costs you cannot pause: housing, utilities, food, transport, insurance, and minimum debt payments. Discretionary spending like dining out, subscriptions, and travel is usually left out, because in a genuine emergency those are the first things to cut. Using essentials keeps the target realistic and reachable rather than inflated by lifestyle costs you would drop anyway.

Should I invest my emergency fund?

The purpose of an emergency fund is stability and access, which is the opposite of what an investment provides. Money held in stocks or funds can be down exactly when you need it, forcing a sale at a loss at the worst moment. The fund is normally kept in a high-yield savings account, money-market account, or similar cash venue where the principal is stable and you can reach it within days. The fund is what lets your invested money stay invested through a rough patch. This is general education, not a recommendation.

Three months or six months of expenses?

It depends on how fragile your income is. Point toward the higher end (or beyond) when you have a single household income, variable or commission pay, self-employment, a specialized role that takes longer to replace, or dependents. Point toward the lower end when you have very stable dual income, strong job security, and low fixed costs. Many people build to three months first as a milestone, then extend toward six once that is in place. The calculator lets you slide between the two.

Where does the emergency fund sit in a full money system?

In the redundancy-first framework, the emergency fund is the redundancy anchor: the layer whose whole job is to absorb a shock so the rest of the system keeps running. It sits alongside an on-ramp for new money, yield venues for cash, and a growth layer for long-term investing. Building the fund first is what makes the growth layer safe to leave untouched during a bad stretch.

Does Obsidian Metrics tell me how much to save?

No. This is a free educational tool. It multiplies the essential monthly expenses you enter by the months of coverage you choose and returns the target. It does not tell you the right number of months for your situation, account for your income stability or dependents, or model irregular expenses. Those judgments are personal and belong with your own planning or a qualified professional. We are not financial advisors.