Interactive Founder Tool
Cash Runway Calculator
Runway is the number a founder least wants to be surprised by. See yours, 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 delivery costs; sets how spend scales as revenue grows
All cash out per month: payroll, tools, rent, and delivery costs
How fast fixed costs creep up (hiring, tooling); delivery costs already scale with revenue
Planned raise (optional)
A future financing event, leave at None to model without one
Your Runway
How long the cash lasts
Cash Runway
9.6 mo
Cash hits zero in month 10
Net Burn / Month
$70K
Cash lost each month (now)
Break-Even
Month 18
After cash-out - assumes the gap is bridged
Burn Multiple
0.91x
Net burn per $1 of new ARR
Raise now, under 12 months
Begin the raise. Below 6 months rounds get much harder to close, move while you still have options.
This month's cash flow
Revenue collected in vs. total spend out
Where you stand in 12 months
At this trajectory, projected cash at month 12 is -$106K, with revenue at $187K/mo and total spend at $227K/mo. Note: cash runs out in month 10, so everything after that assumes the funding gap is bridged.
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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Frequently Asked Questions (FAQ)
How the model works
A deterministic month-by-month projection over five years, on a cash basis: net burn is total spend minus revenue collected, the same number your bank statement shows. Projecting forward, spend splits into delivery costs that scale with revenue (via gross margin) and fixed costs that compound at your cost-growth rate. 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 total cash out minus revenue collected.
Break-even & burn multiple
Break-even is the first month revenue collected covers total 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.
This calculator is open source (Apache-2.0) — the model is transparent and yours to inspect. View the source on GitHub →
Go deeper
Runway is bought with growth, not just cuts
Extending the cash-out date usually means fixing whichever growth leak is starving revenue. The Growth Diagnostic scores all seven pillars and turns the biggest gaps into a plan.