How does gross burn differ from net burn in venture capital modeling?

Gross burn is the total amount of operating expenses a company incurs each month, while net burn is the total amount of money a company loses after accounting for revenue. Investors prioritize net burn as it reflects the true speed at which a startup is depleting its cash reserves.

What is considered a healthy cash runway for a Series A startup?

Typically, a runway of 18 to 24 months is targeted after a funding round. This provides 12 to 18 months of execution time and a 6-month buffer to initiate and close the subsequent fundraising round.

How do non-cash expenses like depreciation impact burn rate calculations?

True cash burn calculations should exclude non-cash expenses like depreciation and amortization. Burn rate is a liquidity metric, focusing strictly on the actual outflow of cash from the bank account.

Can a profitable company have a positive burn rate?

Technically, 'burn rate' refers to negative cash flow. If a company is profitable and generating cash, it has a 'negative burn' or 'cash build.' However, companies with net income can still burn cash if their capital expenditures or debt repayments exceed their profits.

Why is the 'Default Alive' vs 'Default Dead' distinction critical for founders?

A company is 'Default Alive' if it will reach profitability before running out of cash. It is 'Default Dead' if it requires another capital injection to survive. Knowing your burn rate is the only way to accurately determine which path your startup is on.

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Burn Rate Calculator – Forecast Startup Runway | Sapacalc

Burn Rate Calculator: Gross Burn vs Net Burn — Which Number Should You Track?

The burn rate calculator measures how fast your company spends its cash reserves — use it alongside the EBITDA Calculator to see how your spending compares to your actual earning power.

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Current Cash Balance

Monthly Revenue

Monthly Operating Expenses

Cash Runway

14.3 Mos

$35,000

Monthly Net Burn

$45,000

Monthly Gross Burn

Understanding Burn Rate: The Core Difference

Gross burn rate is your total monthly cash outflow — every dollar leaving your account regardless of any revenue coming in. Net burn rate subtracts monthly revenue from that outflow to show your real monthly cash loss. A startup burn rate example: a team spending $90,000 per month with $40,000 in revenue has a gross burn of $90,000 but a net burn of $50,000.

The single variable that determines which number to use is how much revenue you generate. Before your first dollar of recurring revenue, both figures are identical. Once monthly revenue climbs past 30% to 40% of your monthly expenses, net burn becomes the more accurate picture — and the figure most investors want to see.

Gross Burn vs Net Burn: Key Differences

Calculation Method — Gross burn adds every monthly expense: payroll, rent, tools, and marketing. A 10-person team with $70,000 in payroll and $15,000 in other costs has a gross burn of $85,000 with no revenue adjustment.

Revenue Treatment — Gross burn ignores revenue. Net burn subtracts it. That same team bringing in $40,000 monthly in subscriptions has a net burn of $45,000 — 47% lower than gross burn on the exact same cost base.

Runway Impact — On $500,000 in cash, gross burn gives 5.9 months of runway. Net burn gives 11.1 months. That 5-month gap can determine whether you start fundraising now or hold off for better terms.

Investor Expectations — Seed-stage investors typically ask for gross burn because pre-revenue companies have nothing to subtract. Series A investors almost always ask for net burn because it reflects how efficiently you convert spending into revenue.

Operational Signal — Monthly burn rate on a gross basis tells you your cost structure. Net burn tells you how fast you are actually losing money. A company holding gross burn flat while growing revenue 15% per month improves its net burn automatically every single month.

Before setting your monthly paid acquisition budget, use the Ad Budget Calculator to make sure ad spending is not inflating your burn unnecessarily.

Real Scenarios: When Gross Burn Rate Wins

Scenario 1: Pre-Revenue Team Preparing a Seed Pitch A 4-person team has $240,000 in the bank and spends $40,000 per month with zero revenue. Gross burn is the only relevant figure. They have 6 months of runway and need to raise within 3 months to maintain leverage in negotiations.

Scenario 2: Founder Evaluating a New Hire A founder is deciding whether to add a $9,000 per month engineer to a $54,000 gross burn. Adding the hire raises costs 17% and cuts runway from 9 months to 7.7 months on $486,000 in cash — a concrete trade-off gross burn makes visible instantly.

Scenario 3: Early Stage Company Reporting to Investors A startup with $30,000 in early revenue and $85,000 in expenses shows both figures to seed investors. Leading with gross burn of $85,000 alongside the $30,000 revenue context demonstrates transparency without burying the cost structure behind a more flattering net figure.

Real Scenarios: When Net Burn Rate Wins

Scenario 1: SaaS Startup With Growing Subscriptions A 12-person startup spends $90,000 per month and collects $60,000 in monthly recurring revenue. Gross burn suggests 5.6 months on $500,000 in cash. Net burn of $30,000 shows 16.7 months — nearly three times longer. Presenting net burn to a Series A investor gives an accurate picture without triggering false urgency.

Scenario 2: Marketplace With Strong Platform Fees A marketplace spends $75,000 per month and earns $55,000 in fees. Net burn of $20,000 on $400,000 in reserves gives 20 months of runway. Tracking only gross burn would show 5.3 months and lead to unnecessary cost cuts that could slow growth.

Scenario 3: Founder Mapping Path to Profitability A startup has $100,000 in gross burn and $78,000 in revenue — net burn of $22,000. At 12% monthly revenue growth, net burn reaches zero in roughly 3 months. Only net burn makes this trajectory visible to investors evaluating the path to breakeven.

Which Is Right for You: 5 Questions to Ask

Question 1: Do you have recurring revenue above $15,000 per month? If yes, net burn gives a meaningfully different and more accurate picture than gross burn. Below $15,000 in monthly revenue, the two figures are close enough that gross burn is simpler and equally useful.

Question 2: Who will see this number? Pre-seed and seed investors expect gross burn. Growth-stage investors and board members typically want net burn. Knowing your audience tells you which figure to lead with before any meeting.

Question 3: Is your revenue growing month over month? If yes, your net burn is shrinking automatically even if you have not cut a single cost. Tracking net burn monthly shows this progress. A 10% monthly revenue gain on a $70,000 gross burn reduces net burn by roughly $5,000 to $7,000 per month without touching expenses.

Question 4: How much of your monthly spending is customer acquisition? If paid acquisition makes up 30% or more of your expenses, your burn rate and your CAC are directly linked. A drop in conversion can spike your burn overnight. Use the CAC Calculator to check whether you are acquiring customers at a sustainable cost before locking in a monthly budget.

Question 5: Are you within 3 months of running out of cash? Counter-intuitively, when reserves are critically low, plan against gross burn — not net burn. Net burn looks more comfortable, but revenue can fall without warning. Running your survival plan on gross burn when cash is nearly gone ensures you do not miscalculate how much time you actually have.

Burn Rate: 4 Things Most People Get Wrong

Don’t treat burn rate and profit and loss as the same thing. Your P&L uses accounting rules and includes non-cash items. Your cash burn rate tracks actual dollars leaving your bank account. A company can show an accounting profit while still burning $15,000 per month in real cash.
Stop assuming lower burn is always better. A startup burning $120,000 per month with fast revenue growth is in better shape than one burning $35,000 with no growth. Burn rate only makes sense alongside revenue trajectory — a number never seen in isolation.
Don’t skip net burn once you pass your first revenue milestone. Showing only gross burn after you cross $20,000 per month in revenue makes your position look worse than it is. Investors who see only gross burn without net context often assume the business is still pre-revenue.
Correct the idea that startup burn rate is fixed. Most founders treat burn as a static monthly number. In practice, 40% to 60% of startup burn is variable — software, contractors, paid ads, and travel can all be cut within 30 days. Knowing your fixed versus variable split tells you exactly how fast you can reduce spending if needed.