What should I do if my small business runway drops below 2 months?

Immediately pause discretionary capital expenditures, contact your top clients to expedite receivables, negotiate vendor term extensions, and tap credit lines.

Main Street & SMB•Recommended Target: 3–6 months

Small Business Runway Calculator

For small business owners, operating reserves are your financial oxygen mask. Whether facing economic downturns, seasonal slow months, or delayed client invoices, knowing your exact runway lets you make proactive decisions instead of reacting in panic.

Industry Benchmark Guidance (3–6 months):Most commercial lenders and financial advisors recommend small businesses maintain 3 to 6 months of operating expenses in liquid cash reserves. This buffer cushions against supply chain shocks, key employee departures, or emergency equipment replacement.

Quick PresetsClick to test scenario

Current Available CashLiquid reserves

Monthly Revenue

Monthly ExpensesGross Burn

Monthly Revenue Growth

Monthly Expense Growth

One-Time Upcoming Expense

Occurs in Month

Additional Funding Cushion

Arrives in Month

Estimated Cash Runway

Calculated Runway

12.8 months

Healthy: You have 12.8 months of runway (October 2027).

Estimated Cash Depletion:October 2027

Net Burn:$8,000/mo

Net Monthly Burn

$8,000

Expenses − Revenue

Gross Burn (Expenses)

$36,000

Total monthly outlays

Current Cash

$85,000

Liquid reserves balance

Break-Even Target Revenue

Monthly sales required to eliminate cash burn entirely: $36,000/month

Gap: +$8,000/mo

Projected Cash Remaining

Based on trajectory

After 3 Months$61,608

After 6 Months$40,155

After 12 Months$3,968

Projected Cash Trajectory (24-Month Horizon)

Real-time projection showing monthly cash reserves over time.

Cash Balance

Zero Cash Threshold

Hover or tap any month marker to inspect exact projected cash balance, revenue, and burn for that period.

“What If?” Scenario Modeling

Test how cutting burn, expanding sales, or raising capital extends your survival timeline.

Reduce expenses by 5%Sustainable

Save $1,800/mo (new expenses: $34,200/mo)

Runway:

12.8 moSustainable / Infinite

Reduce expenses by 10%Sustainable

Save $3,600/mo (new expenses: $32,400/mo)

Runway:

12.8 moSustainable / Infinite

Reduce expenses by 20%Sustainable

Save $7,200/mo (new expenses: $28,800/mo)

Runway:

12.8 moSustainable / Infinite

Financial Calculation Methodology & Transparency

How the Runway Calculator Works: Mathematical Model & Assumptions

1. Static Cash Runway Formula

For businesses with steady revenue and predictable overhead, runway is determined by dividing liquid cash reserves by net monthly cash deficit:

Runway (months) = Available Cash ÷ Net Monthly Burn

2. Gross Burn vs. Net Burn

Gross Burn: Total cash disbursed each month (payroll, contractors, hosting, rent, utilities).
Net Burn: Gross monthly expenses minus total monthly cash revenue collections.
Break-Even: When Net Burn $\le$ $0$, cash runway is mathematically sustainable or infinite.

3. Dynamic Growth Projections & Interpolation

When revenue growth or expense inflation rates are enabled, the engine calculates month-by-month compound flows up to 60 months:

Ending Cash(m) = Beginning Cash(m) + Revenue(m) - Expenses(m)

Fractional Month = Beginning Cash(depletion) ÷ Monthly Net Burn

We linearly interpolate the exact day/fraction when cash reaches $0, avoiding arbitrary rounded whole months.

4. Client-Side Privacy Guarantee

Every financial computation executes exclusively inside your local browser runtime. No financial balances, revenue figures, or payroll numbers are sent to any remote server or database.

Primary Cost Drivers

Major Burn Drivers for Small Businesses

Commercial Lease & Facilities

Fixed brick-and-mortar rent, property utilities, maintenance contracts, and local municipal fees.

Core Staff Payroll & Overtime

W-2 hourly and salaried personnel, employer insurance contributions, and state unemployment taxes.

Inventory Replenishment & Vendor Terms

Wholesale purchases required ahead of peak sales cycles that temporarily lock up liquid bank balances.

Actionable Levers

How to Extend Small Businesses Runway

Negotiate Flexible Supplier Payment Terms

Request Net-60 or Net-90 terms from reliable vendors to keep cash in your account longer.

Accelerate Accounts Receivable Collections

Send automated invoice reminders, impose late payment fees, or offer a 2% discount for 10-day payment (2/10 Net 30).

Establish a Pre-Emptive Business Line of Credit

Apply for a revolving credit line while your financial ratios are strong, securing standby liquidity before you need it.

Worked Calculation: Local Commercial HVAC Contractor

Starting Cash$85,000

Monthly Cash Inflow$28,000

Monthly Cash Outflow$36,000

With $85,000 in bank deposits, $28,000 average off-season revenue, and $36,000 monthly overhead, the business experiences a net monthly deficit of $8,000. Runway is 10.6 months ($85,000 ÷ $8,000), confirming ample liquidity to comfortably bridge until peak seasonal summer demand.

Frequently Asked Questions: Small Businesses Runway

Common questions and financial benchmarks for small businesses.

A minimum of 3 months of basic operating expenses (payroll, rent, utilities, minimum debt service) is the baseline safety net. High-volatility businesses should target 6 months.