SaaS Runway Calculator by Burn Rate

SaaS Runway Calculator

Estimate how many months your startup can operate before running out of cash. Enter your cash balance, monthly gross burn, and monthly recurring revenue.

Runway Formulas

Net BurnGross Burn − MRR
Runway (net)Cash ÷ Net Burn
Runway (gross)Cash ÷ Gross Burn

This is a simplified projection that assumes flat burn and revenue. Real runway varies with growth, seasonality, and fundraising.

What Is SaaS Runway?

Runway is the number of months a startup can keep operating before it runs out of cash. For SaaS companies, it is driven by two numbers: how much cash you have and how fast you spend it (your burn rate). A shorter runway means you must raise capital, cut costs, or grow revenue soon.

Runway Formulas

If your revenue exceeds your gross burn, your net burn is negative and you are effectively profitable — your runway is unlimited.

Why Track Runway by Burn Rate?

How to Use This Calculator

1. Enter your cash on hand. 2. Enter your monthly gross burn (total monthly expenses). 3. Enter your monthly revenue / MRR. 4. See your net-burn runway, gross-burn runway, and projected depletion date.

ScenarioCashGross BurnMRRRunway
Early seed$500K$40K$5K~14 mo
Growth$2M$150K$80K~29 mo
Profitable$1M$30K$45KInfinite

Use this free tool to model layoffs, pricing changes, or fundraising timing before they become urgent.

Frequently Asked Questions

Runway = Cash on Hand ÷ Net Burn, where Net Burn = Gross Monthly Burn − Monthly Revenue (MRR). For example, $500,000 cash with a $35,000 net burn gives about 14 months of runway.

Gross burn is your total monthly spending. Net burn subtracts revenue (MRR) from gross burn. Runway based on net burn is the more realistic measure because it accounts for money coming in.

Most investors want at least 12-18 months of runway. That gives time to hit milestones and raise the next round without desperation. Below 6 months is considered risky.

Yes. If your monthly revenue equals or exceeds your gross burn, your net burn is zero or negative, meaning you are not consuming cash. In that case runway is effectively unlimited.

Yes, it is completely free and runs instantly in your browser. Enter your cash, burn, and MRR to estimate runway with no signup required.

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