Business · Revenue
Small Business Cash Runway Calculator
Revenue does not help if cash arrives too late.
Revenue does not help if cash arrives too late.
Estimate how many months the business can operate if revenue slows, payments are delayed, or a client leaves.
Best for: Operators deciding whether cash can carry payroll, owner pay, taxes, contractors, and operating costs through a bad month.
Estimate inputs
Decision mode
Get the current planning number from the inputs.
What most advice leaves out
Revenue and cash are not the same. Invoices, deposits, collections, taxes, payroll, and owner pay do not move on the same schedule.
How this calculator thinks
Runway is modeled as available cash divided by monthly cash burn, then stress-tested against revenue drop, client loss, and emergency spending.
Reality check questions
- How many months can cash carry payroll?
- What happens if revenue drops 20 percent?
- What if one client leaves?
- Which outflows are fixed?
- Which cash is tax reserve, not spendable cash?
What this tool does not do
- It does not guarantee a business outcome.
- It does not replace tax, legal, payroll, accounting, compliance, or advisor review when those issues are material.
- It does not know your contracts, state rules, vendor terms, or books.
- It does help you find the assumption that needs the next check.
Your next calculator depends on what felt uncomfortable
Messy questions this calculator should answer
How do I calculate cash runway?
Subtract collected cash from monthly outflows to find burn, then divide available cash by burn.
What if my business is profitable but cash feels tight?
Payment delay, tax reserve, payroll timing, deposits, and growth spending can make profit and cash feel different.
When should I delay hiring or spending?
When stress-case runway is short enough that a late invoice or lost client would threaten payroll, taxes, or owner pay.
Business recommendation rule
Calculator result -> guide -> template -> software or service
Kefiw should not send a Business user from a calculator straight to generic affiliate cards. The result should point to the next decision, then to the asset or tool category that fits the actual bottleneck.
- Step 1
Calculator result
Start with the calculator state, not a tool category.
- Step 2
Result-state guide
Read the guide for the exact weakness the result exposed.
- Step 3
Template or packet
Turn the number into a script, worksheet, checklist, or review packet.
- Step 4
Software or service bridge
Consider tools only after the problem is clear enough to justify them.
Disclosure stays close to recommendation blocks: Kefiw may earn a commission from some links, but calculator results are not changed by affiliate relationships.
Assumptions
- Cash runway is modeled from cash outflows minus collected cash inflows.
- Runway can change quickly when payroll, tax reserve, or collections shift.
Revenue planning is where hope becomes testable
A useful forecast separates expected revenue from committed revenue, invoiced revenue, collected cash, churn replacement, and client-loss risk. If the hidden assumptions look weak, the revenue number is not ready to carry hiring, spending, or owner pay decisions.
- Booked revenue and collected cash are not the same thing.
- One large client can make revenue look safer than it is.
- New sales are not growth until they replace churn, downgrades, late payments, and lost retainers.
- Growth only improves the business when margin, capacity, and cash timing improve with it.
This is decision math, not a generic calculator
The useful output is not one perfect number. It is the spread between conservative, expected, and aggressive assumptions, plus the point where the decision stops being worth the drag.
- Use realistic inputs for time, adoption, churn, admin, and slow months.
- A good result can still say "not worth it yet." That is a feature, not a failure.
- Run the calculator once with optimistic assumptions and once with the ugly-but-plausible case.
When the decision usually goes wrong
Operators usually get hurt by hidden costs: non-billable time, ramp time, management burden, unused seats, tax reserve, scope creep, collection delay, and software maintenance. Those costs are easy to ignore because they do not always arrive as one invoice.
Static decision worksheet: what to ask next
Use the result as a question list, not as an AI verdict. The next move should be driven by the risky assumptions the calculator exposed.
- Tax pages: ask which income, withholding, safe-harbor, state, payroll, and documentation assumptions need professional review.
- Hiring pages: ask whether the work is capacity, process cleanup, role design, classification risk, or payroll cash-flow pressure.
- Pricing pages: ask whether billable hours, revision creep, sales time, discounts, or slow months are the real reason the number feels uncomfortable.
- SaaS and cloud pages: ask which seats, renewals, duplicate tools, contract terms, adoption rates, review time, and exit costs are driving the result.
Related tools and tracks
Tools that may help after you run the numbers
Use this only after the calculator shows where the pressure is. The useful category depends on the bottleneck, not the ad pitch.
- business banking
- bookkeeping software
- accounts receivable tools
- cash-flow planning tools
Source links used for this calculator family
Source check and limits
Last source check: April 30, 2026
Scope checked: Cash-runway planning model using user-entered cash, outflow, collection, revenue-drop, and client-loss assumptions.
This calculator uses educational business-planning assumptions. Revenue forecasts, churn estimates, sales targets, and growth scenarios depend on the inputs you provide and can change with market conditions, customer behavior, payment timing, and operating costs. Kefiw shows the assumptions so you can audit the math before relying on the result.
This tool estimates cash runway using simplified planning assumptions. It does not replace bookkeeping, accounting, or cash-flow management.