Know the month you run out of cash. Before your board asks.
A free Excel calculator that takes your cash balance, your revenue, and your monthly cost base — and returns gross burn, net burn, runway in months, and a 12-month closing cash forecast that shows exactly when the balance turns negative. Built by experienced finance professionals.
📥 Get your free EasePro Calculator- Experienced finance professionals
- Used by US startups & SMEs
- Excel format
- No credit card required
- Updated 2026
Run your own numbers — instant, in your browser.
A quick browser version for a first read on gross burn, net burn, and runway. The Excel file adds the 12-month closing-cash forecast, cost inflation, and the fixed-vs-variable split.
An Excel file with three sheets and one job: tell you how long your cash lasts.
Three tabs you can open, edit, and run in ten minutes.
Cover sheet
Entity name, usage notes, and an index that links straight to the calculator and the forecast tab. Open it once, read it once, you are done.
Calculator sheet
Inputs on the left, outputs on the right. Cash and revenue, fixed costs, variable costs in — gross burn, net burn, runway months and cash burn % out. Yellow cells with blue text are the only ones you edit.
C1_Forecast sheet
A 12-month roll-forward: revenue, direct costs, indirect costs, monthly burn and closing cash. Includes a runway flag that switches off in the month your balance goes negative.
Three input blocks. Two growth rates. One runway number.
Cash and revenue at the top. Fixed costs — salaries, rent, software, legal, insurance — in the middle, with an inflation rate applied to them month by month. Variable costs — marketing, cloud, commissions, contractors — below, with their own growth rate. Totals and every output calculate themselves. Yellow cells are the only ones you ever touch.
Most founders divide cash by last month's burn. That number is always too generous.
Runway is usually quoted from a single division done in someone's head: cash in the bank, divided by whatever last month's burn happened to be. It is fast, it is quotable, and it holds your cost base flat forever — which no cost base ever does. Salaries move, cloud spend follows usage, contractors get extended, insurance renews higher.
One month matters. It is the difference between opening a raise from strength and opening it while your bank balance is doing the negotiating for you. The point of this calculator is not to forecast your next three years. It is to make the one number your board, your bank, and your investors will all ask for defensible — and to show you which of the two levers, cost cuts or revenue growth, actually moves it.
Four steps. Ten minutes.
A monthly discipline, not a setup project.
Cash & revenue
Start month, opening cash or funding in the bank, current monthly revenue or MRR, and the growth rate you would actually defend in a board meeting.
Fixed costs
Salaries, rent, software, legal, insurance — the costs that land whether you sell anything or not. Add one inflation rate and the model escalates them for you.
Variable costs
Marketing, cloud, commissions, contractors. These scale with activity, so they get their own growth rate rather than being lumped in with rent.
Read burn and runway
Gross burn, net burn, runway in months and cash burn % update instantly. The forecast tab shows the exact month closing cash turns negative.
Honest qualification. No fluff.
This calculator is for you if:
- You are an early-stage or expansion-stage business that wants a fast, high-level read on burn rate and runway.
- You need a ballpark number to work from — not a fully custom, scenario-by-scenario model.
- Your closing cash balance falls in most months.
- You want to see whether cutting cost or growing revenue moves your runway more.
- You know your monthly cost base well enough to split it into fixed and variable.
This is not for you if:
- You are consistently profitable and cash-generative — runway is not your constraint.
- You need multi-scenario fundraise modelling, cap table dilution, or waterfall analysis.
- You need cohort-level SaaS metrics — CAC payback, LTV/CAC, net revenue retention.
- You want live bank-feed automation rather than a monthly Excel discipline.
- You need a lender-ready 13-week cash flow with weekly granularity — that is a different template.
This is a high-level calculator for a quick, ballpark burn rate and runway. For a detailed calculator built around your exact numbers, cost drivers, and scenarios, book a call with us and we'll build it with you.
Questions about the calculator, answered honestly.
What format is the calculator?
What is the difference between gross burn and net burn?
Why is my runway shorter in this calculator than in my own spreadsheet?
Is this only for venture-backed startups?
Is this really free? Any catch?
What if I need runway managed and reported properly to investors?
Need a finance team owning burn, runway, and the investor update every month?
Most clients run the calculator once, then ask us to take it over. EasePro's Fractional CFO Services include monthly burn and runway tracking, scenario planning ahead of a raise, cost base analysis, and the board pack that goes with it.
Founders from global advisory firms, supported by an in-house trained team of finance professionals. Big Four-grade depth with our own standards for accuracy and data security.