Startup Runway, Burn Rate & Hiring Calculator
Model your cash runway in months, net burn rate, planned team headcount expansion, and Y Combinator Default Alive vs. Default Dead trajectory. 100% private in browser memory.
Benchmarked against Y Combinator Default Alive framework & SEC equity models. Zero-server browser execution.
Capital, Revenue & OpEx Inputs
Zero Server LoggingTeam Payroll & Compensation
Typically 65%–80% of BurnNon-Payroll Operating Expenses ($/month)
Start pitch meetings 6 months before cash exhaustion to avoid fire-sale terms.
🧭 YC Trajectory Analysis
At your current 7.0% MoM revenue growth and net burn, your revenue is growing fast enough to cover expenses before cash reserves hit zero.
18-Month Headcount & Cash Flow Waterfall
Month-by-month trajectory of team hiring, compounded MRR, gross burn, net burn, and ending bank balance.
| Month | Team (FTE) | MRR ($) | Gross Burn ($) | Net Burn ($) | Cash Reserves ($) | Runway Left |
|---|
The Mathematical Mechanics of Startup Runway & Burn Rate
A startup runway model determines how many months a venture-backed or bootstrapped company can operate before its bank account hits zero. Managing runway is the single most critical fiduciary responsibility of early-stage founders.
While static runway assumes zero revenue growth, dynamic runway simulates compound monthly revenue growth $R_m = R_0 \times (1 + g)^m$ alongside planned team hiring additions.
2. Paul Graham's "Default Alive" vs. "Default Dead" Framework:Formulated by Y Combinator co-founder Paul Graham, a startup is considered Default Alive if its projected revenue growth will reach cash-flow breakeven before current cash reserves run out. If current cash runs out before reaching profitability without an external financing round, the startup is Default Dead. Founders facing Default Dead must either increase revenue growth, cut expenses immediately, or raise capital from a position of relative strength before hitting the 6-month panic threshold.
3. The 1.25x Fully Loaded Compensation Rule:A common founder error is budgeting only base salary for new hires. In reality, employer FICA payroll taxes (6.2% Social Security + 1.45% Medicare), state unemployment (SUTA), health insurance, 401(k) matching, and SaaS developer tooling add an extra 20% to 30% overhead on top of nominal salary. Every $100k employee actually burns $125k of cash per year.
🛡️ 4 Decisive Actions When Runway Drops Below 6 Months
Hiring is the largest recurring fixed cost for any startup. Freezing open requisitions instantly stabilizes gross burn and extends cash reserves by 2 to 4 months without disrupting existing product momentum.
Offer existing monthly customers a 20% discount if they prepay for 12 months upfront. This injects non-dilutive working capital into your bank account immediately, bridging the gap to profitability.
Audit AWS/GCP instances, reserve reserved instances (RIs), eliminate unattached storage volumes, and downgrade unneeded enterprise SaaS licenses. Startups frequently trim 15% to 25% off non-payroll OpEx within 48 hours.
Do not wait until you have 6 weeks of cash to talk to investors. Approach existing angel and seed investors with 6 months of runway to negotiate an internal SAFE extension round while you still have leverage.
Frequently Asked Questions (FAQs)
What is the difference between Gross Burn and Net Burn?
Gross Burn is the total cash your startup spends each month on all operating expenses (salaries, software, servers, rent, legal, marketing). Net Burn is the actual cash lost after subtracting your incoming revenue (Gross Burn minus Gross Margin Revenue). Runway is determined by Net Burn.
What does Paul Graham's 'Default Alive' mean?
A startup is 'Default Alive' if, assuming current revenue growth rate and burn rate hold constant, it will reach cash-flow profitability before running out of money without needing additional venture capital. If it will run out of cash before breaking even, it is 'Default Dead'.
How much runway should an early-stage startup maintain?
Venture investors recommend maintaining at least 18 to 24 months of cash runway post-fundraising. Because institutional fundraising typically takes 3 to 6 months, founders should begin preparing their next round whenever runway drops below 9 months, and must launch active partner meetings when runway touches 6 months.
What is fully loaded employee cost overhead?
Fully loaded employee cost includes base salary plus employer payroll taxes (FICA, FUTA, SUTA ~7.65%-10%), healthcare and retirement benefits (10%-15%), and equipment/software seat licenses (3%-5%). In the US, fully loaded compensation is typically 1.20x to 1.30x the nominal base salary.
How does hiring engineers or sales reps impact runway?
Hiring increases fixed recurring monthly expenses immediately. For example, hiring two engineers at $150k base ($180k fully loaded each) adds $30,000/month to gross burn, shortening an 18-month runway to approximately 13 months on a $1.5M cash reserve if revenue does not accelerate.
Is my startup's financial data stored or transmitted to remote servers?
No. FreeCalcSuite executes 100% of calculations client-side in your browser's local JavaScript memory. Zero financial inputs, burn figures, or payroll numbers are sent to or stored on any server.
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