Can I Afford It Calculator
Enter your monthly money below. You'll get a clear answer, your real numbers, and a safer next step.
What this calculator tells you
This tool gives you a quick, honest snapshot of how a purchase or new monthly payment would affect your budget. It shows how much money you have left each month before and after the new cost, and how long your savings would cover your essentials if your income stopped.
It's designed to reduce the guesswork and the anxiety — so you can make a decision based on your actual numbers instead of a gut feeling.
How the result is calculated
We keep the math simple and conservative:
- Monthly leftover = take-home income minus all your monthly expenses.
- Leftover after the new cost subtracts a monthly payment from that total (a one-time cost instead reduces your savings).
- Emergency runway = your savings divided by your monthly expenses — roughly how many months you could cover essentials with no income.
We aim to keep at least 10% of your income as breathing room and at least three months of emergency runway. Falling short of those moves the result toward yellow or red.
What Green, Yellow, and Red mean
Green
Healthy cash flow and at least 3 months of runway. This looks comfortable.
Yellow
Possible, but it creates pressure or lowers your safety buffer.
Red
Too little monthly cash flow or too little emergency savings.
Example scenarios
A comfortable yes: You bring home $4,000, spend $2,800 on essentials, and have $9,000 saved. A $200/month subscription still leaves a solid margin and over three months of runway — green.
A thin margin: Same income and expenses, but only $2,500 saved and a $700/month car payment. It fits on paper, but your buffer gets thin — yellow.
Too much pressure: A $900/month payment on top of $3,400 in expenses with $1,000 saved would leave almost nothing each month and under a month of runway — red.
Common mistakes people make
- Only looking at the sticker price, not the ongoing monthly cost.
- Forgetting irregular bills like insurance, repairs, and annual fees.
- Draining the emergency fund to make a purchase "work."
- Using gross income instead of actual take-home pay.
- Assuming income will rise to cover a stretch purchase.
- Ignoring how one new payment stacks on top of existing debt.
Frequently asked questions
How does the Can I Afford It calculator work?
It compares your monthly take-home income against your regular expenses, then checks how the new purchase or payment affects your leftover cash flow and your emergency savings runway. You get a plain-English green, yellow, or red answer.
What's a good amount to have left over each month?
As a general guideline, keeping at least 10% of your take-home income as breathing room helps you absorb surprises. This tool flags results that fall below that buffer.
How many months of emergency savings should I have?
Most guidance suggests three to six months of essential expenses. The calculator treats three months of runway as a healthy baseline when judging affordability.
Is my financial information saved or shared?
No. All calculations happen in your browser. Nothing you enter is stored, sent to a server, or shared with anyone.
Is this financial advice?
No. The results are educational estimates based only on the numbers you enter. They are not investment, tax, legal, or professional financial advice. For decisions that matter, consider speaking with a qualified professional.
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Financial disclaimer
This calculator provides general educational estimates only. It is not investment, tax, legal, or professional financial advice, and it does not account for every part of your situation. For decisions that matter, consider speaking with a qualified professional. Read our full financial disclaimer.