🔥 Burn Rate Calculator

Calculate startup monthly burn, runway months remaining, and zero-cash date from cash balance and net spend.

Startup Runway — Gross vs Net Burn

BrainyCalculators editorial insight — unique to this tool

Gross burn is total monthly cash out; net burn subtracts revenue — a seed-stage SaaS spending $120K/mo with $30K MRR has $90K net burn. Runway = cash ÷ net burn; $1.8M in the bank at $90K net burn ≈ 20 months. Indian startups post-2022 funding crunch track burn weekly; investors expect 18–24 months runway at raise.

When to use this calculator

Use for startup cash runway planning. For mature business operating cash flow, use Cash Flow.

Reference	Value	Context
Target runway at raise	18–24 mo	VC expectation
Net burn	Gross − revenue	True cash drain
Rule of 40 (SaaS)	Growth% + margin% ≥ 40	Efficiency benchmark
Down round trigger	< 6 mo runway	Urgent fundraise

One-time launch expenses before opening?

This page tracks ongoing monthly burn. For initial setup costs, use the Startup Cost Calculator →

Month:

Monthly Expenses

Monthly Revenue ($)

What is Burn Rate?

Burn rate is net cash spent per month before profitability. Runway divides remaining cash by burn to estimate months until funds are exhausted.

Use this page for investor updates and cash discipline. Startup cost totals one-time launch expenses; cash flow models detailed monthly in/out categories.

Customer lifetime value analyzes unit economics per customer, not treasury runway.

How the Burn Rate Calculator Works

Formula, assumptions, and calculation steps for this ai & tech tool.

Methodology

AI and technology calculators estimate usage, cost, bandwidth, storage, or SaaS metrics by combining unit rates with volume assumptions.

Calculation Steps

Enter token counts, storage, traffic, users, or usage volume.
Normalize units such as GB, TB, tokens, requests, or months.
Multiply by the selected rate or apply the SaaS metric formula.
Show monthly or per-use totals for comparison.

Assumptions and Limits

Vendor prices can change and should be verified before budgeting.
Taxes, free tiers, and committed-use discounts are included only if modeled.
Results are estimates for planning and comparison.

Frequently Asked Questions

What is burn rate?

Burn rate is the monthly rate at which a company spends its cash. Gross burn is total monthly expenses. Net burn subtracts revenue — it is the actual monthly cash depletion. Runway = Cash ÷ Net Burn.

What is a healthy burn rate for a startup?

It depends on stage and funding. Early-stage startups often burn $50K-$200K/month. Series A companies $200K-$1M. The key question is not the absolute number but whether burn is proportional to growth and runway.

How do I calculate burn rate from financials?

Look at your bank account balance at the start and end of the month. The difference (if lower) is your net burn. Or sum all cash outflows from your bank statement, then subtract all cash inflows from customers.

What should I cut to reduce burn?

The biggest levers are typically headcount (50-70% of burn for most startups), followed by office space, cloud infrastructure, and marketing spend. Prioritize cuts that have the least impact on revenue generation.

How often should I track burn rate?

Monthly minimum, weekly if runway is under 6 months. Track both gross and net burn. Compare month-over-month to catch unexpected increases early. Present to your board with a waterfall breakdown by category.

Real-World Applications

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Board Reporting

Startups present gross burn, net burn, and runway month-on-month in board meetings — investors use these figures to assess capital efficiency and decide on follow-on investment timing.

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Fundraising Readiness

VCs require a minimum of 12–18 months runway post-investment. Founders calculate burn rate to determine the fundraising target needed to sustain operations through the next milestone.

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Cost-Cutting Decisions

When runway falls below 6 months, teams use burn breakdown by category to identify the highest-impact cost cuts — typically headcount, then infrastructure and marketing.

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Growth Planning

High-growth startups model burn rate scenarios for different hiring plans: "If we hire 5 engineers, our burn increases by $X and runway shortens by Y months."

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Investor Due Diligence

Acquirers and late-stage investors review historical monthly burn rate trends to assess whether a company's spending scales proportionally with revenue growth.

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Scenario Planning

CFOs model optimistic, base, and downside burn scenarios to understand what revenue shortfalls or cost increases would trigger a need for emergency fundraising.

Common Mistakes

Tracking Only Net Burn

Net burn tells you how much cash you lose each month, but gross burn reveals the underlying cost structure. A company can have low net burn simply because of lumpy revenue — gross burn exposes the true expense base.

Using an Accounting View Instead of Cash View

Burn rate is a cash metric, not an accounting one. Accrual expenses (deferred revenue, depreciation) should not be included. Track actual cash out of the bank account, not P&L line items.

Ignoring Non-Recurring Costs

Large one-time costs (legal fees, equipment purchases, office fit-outs) can inflate a single month's burn dramatically. Separate recurring from non-recurring spend for a meaningful trend view.

Not Including Founder Salaries

Founders who take no or below-market salaries artificially suppress burn rate. When planning fundraising or hiring, always model burn inclusive of market-rate compensation for all roles.

Calculating Runway on Gross Rather Than Net Burn

Runway = Cash ÷ Net Burn (not gross burn). Using gross burn ignores revenue and significantly understates how long the company can survive, leading to unnecessarily premature fundraising.

Startup Burn Rate by Stage

Stage	Typical Gross Burn	Runway Target
Pre-seed / Bootstrapped	$10K–$50K/month	12–18 months
Seed (post-funding)	$50K–$150K/month	18–24 months
Series A	$150K–$500K/month	18–24 months
Series B	$500K–$2M/month	18+ months
Growth Stage	$2M+/month	12–18 months (growth-focused)

References

Ries, E. The Lean Startup. Crown Business, 2011.
Horowitz, B. The Hard Thing About Hard Things. HarperBusiness, 2014.
Y Combinator. Default Alive or Default Dead? paulgraham.com.
Sequoia Capital. Adapting to Endure — Financial Planning Advice. sequoiacap.com, 2022.
Feinleib, D. Why Startups Fail. Apress, 2012.