Cash survival
Runway & milestone burn modeler
Compounding revenue, netted churn and step function hiring. Not cash divided by net burn.
- Milestone events
- Live chart
- Shareable links
Cash & burn
Revenue engine
Milestone timeline
Step-events overlaid on the burn curve.
Runway model
$500,000 cash · $40,000 burn · $10,000 MRR
Cash hits zero in month 12 (date pending). Reaching month 24 needs $601,001 of new capital, or an equivalent recurring cost cut.
Month-by-month detail
49 rows| Month | Revenue | Expenses | Net burn | Cash |
|---|---|---|---|---|
| Now | $10K | $40K | $30K | $500K |
| M1 | $10.35K | $40K | $29.65K | $470.35K |
| M2 | $10.71K | $40K | $29.29K | $441.06K |
| M3 | $11.09K | $40K | $28.91K | $412.15K |
| M4 | $11.48K | $58K | $46.52K | $365.62K |
| M5 | $11.88K | $58K | $46.12K | $319.5K |
| M6 | $12.29K | $65.5K | $53.21K | $266.29K |
| M7 | $12.72K | $65.5K | $52.78K | $213.52K |
| M8 | $13.17K | $65.5K | $52.33K | $161.18K |
| M9 | $13.63K | $65.5K | $51.87K | $109.31K |
| M10 | $14.11K | $65.5K | $51.39K | $57.92K |
| M11 | $14.6K | $65.5K | $50.9K | $7K |
| M12 | $15.11K | $65.5K | $50.39K | -$43.37K |
| M13 | $15.64K | $65.5K | $49.86K | -$93.23K |
| M14 | $16.19K | $65.5K | $49.31K | -$142.54K |
| M15 | $16.75K | $65.5K | $48.75K | -$191.29K |
| M16 | $17.34K | $65.5K | $48.16K | -$239.45K |
| M17 | $17.95K | $65.5K | $47.55K | -$287K |
| M18 | $18.57K | $65.5K | $46.93K | -$333.93K |
| M19 | $19.23K | $65.5K | $46.27K | -$380.2K |
| M20 | $19.9K | $65.5K | $45.6K | -$425.81K |
| M21 | $20.59K | $65.5K | $44.91K | -$470.71K |
| M22 | $21.32K | $65.5K | $44.18K | -$514.9K |
| M23 | $22.06K | $65.5K | $43.44K | -$558.33K |
| M24 | $22.83K | $65.5K | $42.67K | -$601K |
| M25 | $23.63K | $65.5K | $41.87K | -$642.87K |
| M26 | $24.46K | $65.5K | $41.04K | -$683.91K |
| M27 | $25.32K | $65.5K | $40.18K | -$724.09K |
| M28 | $26.2K | $65.5K | $39.3K | -$763.39K |
| M29 | $27.12K | $65.5K | $38.38K | -$801.77K |
| M30 | $28.07K | $65.5K | $37.43K | -$839.21K |
| M31 | $29.05K | $65.5K | $36.45K | -$875.65K |
| M32 | $30.07K | $65.5K | $35.43K | -$911.09K |
| M33 | $31.12K | $65.5K | $34.38K | -$945.47K |
| M34 | $32.21K | $65.5K | $33.29K | -$978.76K |
| M35 | $33.34K | $65.5K | $32.16K | -$1.01M |
| M36 | $34.5K | $65.5K | $31K | -$1.04M |
| M37 | $35.71K | $65.5K | $29.79K | -$1.07M |
| M38 | $36.96K | $65.5K | $28.54K | -$1.1M |
| M39 | $38.25K | $65.5K | $27.25K | -$1.13M |
| M40 | $39.59K | $65.5K | $25.91K | -$1.15M |
| M41 | $40.98K | $65.5K | $24.52K | -$1.18M |
| M42 | $42.41K | $65.5K | $23.09K | -$1.2M |
| M43 | $43.9K | $65.5K | $21.6K | -$1.22M |
| M44 | $45.43K | $65.5K | $20.07K | -$1.24M |
| M45 | $47.02K | $65.5K | $18.48K | -$1.26M |
| M46 | $48.67K | $65.5K | $16.83K | -$1.28M |
| M47 | $50.37K | $65.5K | $15.13K | -$1.29M |
| M48 | $52.14K | $65.5K | $13.36K | -$1.31M |
What it calculates
How long your cash lasts, and what changes that.
The runway calculator answers one question precisely: on your current trajectory, how many months of cash do you have left, and what happens if you change the plan along the way.
Most calculators divide cash by net burn and stop there. That is only true if your revenue never grows and your costs never change. In reality revenue compounds while hires arrive as steps, so one engineering hire in month four can move your end date by months.
Model the growth rate, the churn rate and the events you already know about. You get a date instead of a guess, plus the exact capital shortfall if you want to reach a specific month.
Where the cash actually runs out
A fractional month count and the calendar date, interpolated inside the month the balance crosses zero instead of rounded up.
Whether you are default alive
The month revenue covers recurring burn. That is the difference between a raise you choose and a raise you need.
How much capital closes the gap
The peak deficit across the horizon, or the shortfall to any target month you care about.
The math, in full
See exactly how the runway model is calculated
Six formulas, every assumption, a worked example generated from the default inputs, and the questions founders ask most.
- LaTeX formulas
- Worked example
- Assumptions
- Glossary
- FAQ