Calculators
Burn Rate and Runway Calculator
Calculate gross and net burn rate and how many months of runway your cash gives, with optional revenue growth.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Deciding when to start fundraising
- Testing the effect of a hiring plan on runway
- Board and investor updates
- Planning cost cuts
About this tool
What the Burn Rate and Runway Calculator does
Burn rate is how fast a company spends cash. Gross burn is total monthly spending; net burn subtracts revenue. Runway is the number of months until the cash runs out. This calculator also lets revenue grow each month, which extends runway.
Formula
- Gross burn = monthly operating expenses
- Net burn = expenses − revenue
- Runway = cash ÷ net burn (simulated month by month when revenue or expenses grow)
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Cash in the bank | $900,000 |
| Monthly operating expenses | $115,000 |
| Monthly revenue | $40,000 |
| Monthly revenue growth | 0% |
| Monthly expense growth | 0% |
| Result | Value |
|---|---|
| Runway | 12 months |
| Net burn per month | $75,000 |
| Gross burn per month | $115,000 |
| Self-sustaining | No |
How to read the result
Use net burn for runway, but watch gross burn too: it shows how much you would need to cut if revenue stalled.
Revenue growth can turn a short runway into a long one. If growth makes the company self-sustaining before cash runs out, the calculator says so.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Gross burn is total cash spent each month. Net burn is gross burn minus cash coming in from revenue.
Many investors suggest 18 to 24 months after a raise, and starting the next raise with at least 9 to 12 months left.
Divide cash in the bank by monthly net burn. If revenue or costs change each month, simulate the months instead.
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