SaaS / Cash
Burn Rate and Runway Calculator for Startups
Work out your net burn rate and how many months your cash will last, at today's burn and with monthly revenue and cost growth, see when you would break even, and follow the cash month by month.
Burn Rate and Runway Calculator for Startups: Net burn is costs minus revenue: 70,000 − 20,000 = 50,000 a month, so 600,000 lasts 12 months at today's rate. With growth, each month's revenue and costs are increased and the burn taken from the cash until it runs out or revenue overtakes costs; 5% monthly revenue growth against 1% for costs only stretches that to 12.7 months, because revenue would not overtake costs until about month 33. Runs 100% locally in your browser with zero server file uploads.
- Category
- Business & admin tools
- Runs
- In your browser
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- Free · no sign-up
- Availability
- Ready to use
Runs entirely in your browser
| Month | Revenue | Costs | Burn | Cash left |
|---|---|---|---|---|
| 1 | 20,000 | 70,000 | 50,000 | 550,000 |
| 2 | 21,000 | 70,700 | 49,700 | 500,300 |
| 3 | 22,050 | 71,407 | 49,357 | 450,943 |
| 4 | 23,153 | 72,121 | 48,969 | 401,974 |
| 5 | 24,310 | 72,842 | 48,532 | 353,442 |
| 6 | 25,526 | 73,571 | 48,045 | 305,397 |
| 7 | 26,802 | 74,306 | 47,504 | 257,893 |
| 8 | 28,142 | 75,049 | 46,907 | 210,985 |
| 9 | 29,549 | 75,800 | 46,251 | 164,734 |
| 10 | 31,027 | 76,558 | 45,531 | 119,203 |
| 11 | 32,578 | 77,324 | 44,746 | 74,457 |
| 12 | 34,207 | 78,097 | 43,890 | 30,567 |
| 13 | 35,917 | 78,878 | 42,961 | -12,393 |
Net burn is costs minus revenue; runway is cash divided by net burn. With 600,000 in the bank and a net burn of 50,000 a month, money lasts 12 months. Growth changes that, though often less than hoped: revenue growing 5% a month while costs grow 1% stretches it only to 12.7 months, since revenue would not catch up with costs until about month 33. Fundraising usually takes six months or more, so start well before the runway gets short.
Scenarios
Try cutting costs 10% with a negative cost growth, or slowing revenue growth to see the downside. Small monthly growth rates compound: 5% a month is almost 80% a year.
Break-even for a product
For the sales needed to cover fixed costs at a given price and margin, use the break-even calculator.
How to use it
- Enter cash in the bank, monthly revenue, and monthly costs.
- Set how fast revenue and costs grow each month.
- Read the runway, the break-even month, and the table.
Privacy & limitations
Everything is calculated in your browser.
Related tools
Frequently asked questions
What is the difference between gross and net burn?
Gross burn is everything you spend each month; net burn subtracts revenue, which is what actually drains the bank account.
How much runway should a startup have?
Many investors advise 18 to 24 months after raising money, since the next round can take six months or more to close.
Does it include taxes or one-off costs?
Only if you add them to the monthly costs; a large one-off payment is best subtracted from the cash first.
Free tool · runs in your browser · no account required