Interactive Founder Tool
Cash Runway Calculator
Most startups that fail run out of cash, and most founders can't say how many months they have left. See your runway, your cash-out month, and what extends it.
Your Numbers
Use cash-basis figures, money actually in and out, not invoiced. Results update instantly.
What you have today, across all accounts
Cash collected per month right now (MRR), not invoiced
Month-over-month growth in collected revenue
Share of revenue left after variable cost of delivery (COGS)
Fixed monthly spend including payroll, tools, rent
How fast costs creep up month over month (hiring, tooling)
Planned raise (optional)
A future financing event, leave at None to model without one
Your Runway
How long the cash lasts
Cash Runway
6.8 mo
Cash hits zero in month 7
Net Burn / Month
$90K
Cash lost each month (now)
Break-Even
Month 21
Gross profit covers operating spend
Burn Multiple
1.17x
Net burn per $1 of new ARR
Raise now, under 12 months
Begin the raise. Below 6 months most investors disengage, move while you still have leverage.
This month's cash flow
Gross profit in vs. operating spend out
Before vs. After
Operating spend (out) vs. gross profit (in)
Projected annual savings of $60K
Where you stand in 12 months
At this trajectory, projected cash at month 12 is -$390K, with revenue at $187K/mo and operating spend at $208K/mo.
This is a planning estimate on cash-basis inputs, not a forecast. Want a three-scenario model (base / upside / downside) built on your real numbers? let's talk.
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Commonly Asked
How the model works
A deterministic month-by-month projection over five years. Revenue and operating spend each compound at their monthly rates, gross profit is revenue times gross margin, and net burn is operating spend minus gross profit. A planned raise lands in its month. Cash is tracked to the dollar and runway is interpolated where the balance crosses zero.
Runway & net burn
Runway is cash divided by net burn, projected forward as both revenue and costs change. Net burn is operating spend minus the gross profit your revenue contributes.
Break-even & burn multiple
Break-even is the first month gross profit covers operating spend. Burn multiple is net burn per dollar of new ARR: under 1x is strong, above 2x warrants a look.
Fundraising triggers
Guidance bands follow common practice: comfortable above 18 months, prepare at 12-18, raise under 12, and treat under 6 months as critical. Closing a round typically takes 4-6 months.
A planning estimate, not a forecast
The model assumes steady growth and cost rates, which never hold exactly. Use it to pressure-test a decision quickly; a real plan models base, upside, and downside on your actual numbers.