Business

Startup Burn Rate Calculator

Calculate your startup's gross burn, net burn, and runway in months. Know exactly how long your cash will last.

Quick Answer

Net Burn = Monthly Expenses - Monthly Revenue. Runway = Cash in Bank / Net Burn. A startup spending $80K/mo earning $20K/mo with $600K in the bank has 10 months of runway.

Calculate Burn Rate & Runway

Enter your monthly expenses, revenue, and available cash.

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Disclaimer: This calculator provides simplified burn rate and runway estimates assuming constant expenses and revenue. Actual runway depends on revenue growth, seasonal fluctuations, and one-time costs. This tool is for educational purposes only and should not be considered financial advice.

About This Tool

The Startup Burn Rate Calculator helps founders, CFOs, and investors quickly determine gross burn rate, net burn rate, and runway in months. Understanding how fast you are consuming cash and how long your reserves will last is critical for making informed decisions about hiring, fundraising, and spending.

Gross Burn vs Net Burn

Gross burn rate is your total monthly operating expenses, including salaries, rent, software, marketing, and all other costs. Net burn rate subtracts monthly revenue from gross burn, giving you the actual amount of cash consumed each month. For a pre-revenue startup, gross and net burn are the same. As revenue grows, the gap between gross and net burn widens, and achieving net burn of zero (or negative) means you have reached profitability or cash flow breakeven. Both metrics are important: gross burn shows your cost structure while net burn shows your actual cash consumption.

How Much Runway Do You Need?

Most experienced operators and investors recommend maintaining 12-18 months of runway at all times. This provides enough buffer to execute on your plan, adapt to unexpected challenges, and fundraise from a position of strength rather than desperation. Companies with less than 6 months of runway are in the danger zone and should immediately focus on either raising capital or cutting costs. Having 24+ months of runway provides maximum strategic flexibility but may indicate you are being too conservative and could invest more aggressively in growth.

Managing Burn Rate Effectively

The best founders treat burn rate as a strategic lever, not just a number to minimize. Every dollar spent should map back to a clear growth hypothesis. Common strategies for managing burn include keeping headcount lean (people are typically 60-80% of SaaS burn), using contractors and agencies for non-core functions, negotiating annual payment discounts with vendors, and maintaining a zero-based budgeting approach where every expense must be re-justified each quarter. The goal is not to minimize burn but to maximize the return on every dollar burned.

Frequently Asked Questions

What is burn rate?
Burn rate is the rate at which a startup spends its cash reserves. Gross burn rate is your total monthly expenses regardless of revenue. Net burn rate is your monthly expenses minus monthly revenue, representing the actual cash consumed each month. If you spend $100,000/month and earn $40,000/month, your gross burn is $100K and your net burn is $60K.
How do you calculate runway?
Runway = Cash in Bank / Net Monthly Burn Rate. If you have $600,000 in the bank and your net burn is $50,000 per month, you have 12 months of runway. This tells you how long you can continue operating before running out of cash, assuming burn rate and revenue remain constant. Most investors want to see at least 12-18 months of runway.
What is a healthy burn rate for a startup?
There is no universal healthy burn rate since it depends on stage, funding, and growth trajectory. Seed-stage startups typically burn $50-150K per month. Series A companies often burn $150-500K per month. The key metric is not the absolute burn but the runway it provides and the growth it generates. A high burn rate that drives rapid, efficient growth can be justified, while even moderate burn without corresponding progress is wasteful.
When should a startup start fundraising based on runway?
Start fundraising when you have 6-9 months of runway remaining. Fundraising typically takes 3-6 months, so beginning at 9 months gives you a buffer. Starting earlier (12+ months out) is even better as it removes desperation from negotiations. If your runway drops below 3 months without a fundraise in progress, you are in critical territory and should focus on reducing burn rate immediately.
How can startups reduce burn rate?
Common strategies include renegotiating vendor contracts, reducing headcount or delaying new hires, cutting non-essential software subscriptions, transitioning from office space to remote work, reducing paid marketing spend in favor of organic channels, and deferring non-critical product development. The most effective approach is often to focus spending on activities that directly drive revenue or customer acquisition while eliminating everything else.

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