What Savings Roast does
Savings Roast is a free online calculator that answers one specific question: how long will your savings last?
You enter three numbers: your current savings, your monthly spending, and your monthly income. The calculator tells you your net monthly burn rate (how fast your savings are shrinking) and your savings runway (how many months until the money runs out at the current rate).
That is the entire product. One honest number, delivered in under 30 seconds, with no account required and no financial data sent to any server.
💡 The calculator is on the home page. You can open it now, enter your numbers, and come back here to understand what to do with the result.
Who this is for
Savings Roast is useful for anyone who wants an honest picture of where they stand financially. In particular:
- People between jobs or on reduced income who need to know exactly how long their savings will hold.
- Freelancers and self-employed people whose income varies and who need to understand their safety margin.
- Anyone building an emergency fund who wants to see how their current savings stack up against their monthly burn rate.
- People who suspect their spending is too high but have never quantified the actual impact on their savings.
- Anyone who has avoided looking at their finances and wants a gentle, honest starting point without spreadsheets or sign-ups.
You do not need to be in financial difficulty to find this useful. Knowing your runway is valuable even when savings are growing, as it tells you how much buffer you have and how much optionality your savings give you.
How the calculator works
The maths behind Savings Roast is simple arithmetic in two steps. There are no black boxes.
Step 1: Monthly Spending − Monthly Income = Monthly Burn Rate
This is how much your savings shrink each month. If income covers spending, the burn rate is zero or negative, meaning savings are stable or growing.
Step 2: Current Savings ÷ Monthly Burn Rate = Months of Runway
This is how long your savings would last if nothing changed.
What to enter:
- Current savings: The liquid cash you can access within a few days, such as a savings account or similar. Not investments, pension funds, or money tied up in assets.
- Monthly spending: Your actual average monthly outgoings, covering rent or mortgage, groceries, bills, subscriptions, transport, everything. Check your last two bank statements rather than guessing. Most people underestimate this by 15-25%.
- Monthly income: Your take-home pay after tax, the amount that actually arrives in your account. If income varies, use a realistic monthly average.
The result is a directional estimate, not a precise forecast. It assumes your spending and income stay constant, which they rarely do. Treat it as an honest baseline, a starting point for understanding your position.
Understanding your result
Your savings runway falls into one of six tiers. Here is what each means and what it calls for:
A single unexpected expense can tip you into debt. This calls for immediate, concrete action, not vague plans. See what to do when savings are running low.
The standard emergency fund benchmark. Covers most short-term disruptions. Use this breathing room to push toward 6 months rather than relax.
You can handle a crisis, leave a difficult situation, or take a calculated risk without panic. Aim here if you are self-employed or have dependants.
The question shifts from survival to optimisation. Your savings are protected. Now the priority is making sure they are working productively.
Your savings are not being drawn down. They are stable or growing. The runway is indefinite at current rates. Focus shifts to deploying savings productively.
What to do with your result
The number is a starting point, not a verdict. Here is the most useful way to act on it:
- Accept the number as accurate. Most people’s first instinct is to dispute the result. Resist this. Check your actual spending against your last two bank statements. The result is only wrong if the inputs are wrong.
- Use the What-If simulator. Below your result, the What-If section shows exactly how much each change, cutting £100/month or adding £250 income, extends your runway. Small changes have outsized effects.
- Identify one lever to pull. Every runway improvement comes from spending less, earning more, or both. Pick the single most actionable change and make it before you close the tab.
- Set a reminder to recalculate. Your runway changes every time your income or spending changes. Recalculating quarterly takes two minutes and keeps you from being surprised.
Which guides to read next
Depending on your result, these are the most useful next reads:
If your runway is under 3 months:
- What to Do If Your Savings Run Out: immediate action steps by runway length
- How to Cut Monthly Expenses: category-by-category spending reductions
- Subscription Cancellation Checklist: find hidden recurring costs fast
If your runway is 3-6 months:
- How to Make Your Savings Last Longer: the two levers, practically applied
- Emergency Fund Calculator: find your exact savings target
- High-Yield Savings Accounts: make your buffer work harder while you build it
If your runway is 6+ months or stable:
- The 50/30/20 Budget Rule: a framework to keep the surplus growing
- High-Yield Savings Accounts: idle savings should be earning 4-5% APY
- Savings Runway Guide: deeper understanding of what the tiers mean
Why there is a roast
Personal finance is a topic most people find stressful or uncomfortable. The honest number, “your savings will last 4.7 months,” can land hard.
The roast makes that landing slightly softer. A short piece of comedic writing acknowledges the situation without pretending it is fine. It makes the result memorable. And it tends to prompt action more effectively than cheerful encouragement.
Every roast follows one rule: it comments on a habit or situation, never on the person. Nobody chooses to struggle financially. The roast is always aimed at something that can change, not at who you are.
If the roast is not for you, select Coach Me mode before calculating. You will get the same number and tips, without the commentary.
What this is not
Savings Roast is a free estimation tool for general education and informational purposes. It is not financial advice, investment advice, tax advice, or any other form of professional guidance tailored to your specific situation.
The calculator uses simplified arithmetic. It does not account for inflation, investment returns, tax implications, irregular income, debt obligations, or the dozens of other variables that real financial planning involves. Use the result as a directional estimate, not a forecast.
If your runway is very short and you are facing genuine financial difficulty, please speak to a qualified financial professional. Many offer free initial consultations. See our full disclaimer and editorial standards.
This page is for general education and informational purposes only. It does not constitute personalised financial advice. Read our Editorial Standards and full disclaimer.