Every startup founder needs to know two numbers above everything else: how much cash they have, and how fast they’re spending it. The speed of spending is your burn rate — and it determines when you need to raise your next round, whether your business model is viable, and whether you have enough time to hit your next milestone.
This free burn rate calculator takes your monthly expenses and revenue and gives you your gross burn (total monthly spend), net burn (how much cash actually leaves the bank each month), cash runway (months until zero), and burn multiple (how efficiently you’re converting burn into growth).
It’s essential for startup founders, CFOs, and investors who need an honest, up-to-date view of their cash position at all times.
Use the Calculator
What Is a Burn Rate Calculator (Free) – How Fast Is Your Startup Spending Cash??
Burn rate measures how fast a startup is spending its cash reserves. There are two versions, and understanding the difference is critical:
- Gross Burn Rate — the total monthly cash outflow (all expenses combined, regardless of revenue)
- Net Burn Rate — monthly cash outflow minus monthly revenue. This is the actual rate at which your bank balance is decreasing
For pre-revenue startups, gross burn and net burn are identical. For revenue-generating startups, net burn is the number that matters most — it reflects the real-world pace at which you’re consuming your runway.
Burn Multiple is a more recent efficiency metric popularised by venture investor David Sacks: it divides net burn by net new ARR. A burn multiple below 1.5× means you’re adding more ARR than you’re burning — considered efficient. Above 3× signals capital inefficiency.
Formula
Three connected formulas give you the complete picture:
Gross Burn Rate = Total Monthly Expenses Net Burn Rate = Total Monthly Expenses − Monthly Revenue (MRR) Cash Runway = Current Cash Balance ÷ Net Burn Rate Burn Multiple = Net Burn ÷ Net New ARR Added
Example Calculation
A Series A SaaS startup with $500K in the bank, $108K monthly expenses, and $25K MRR:
| Salaries & benefits | $80,000 |
| Infrastructure & tools | $8,000 |
| Sales & marketing | $15,000 |
| Other operating expenses | $5,000 |
| Gross Monthly Burn | $108,000 |
| MRR (monthly revenue) | −$25,000 |
| Net Monthly Burn | $83,000 |
| Cash Runway ($500K ÷ $83K) | 6.0 months ⚠️ |
What Is a Good Result?
Runway and burn multiple benchmarks for evaluating startup health:
| Runway months | Status | Action |
|---|---|---|
| Under 6 | 🚨 Critical | Immediate cost cuts or emergency fundraise |
| 6–9 | ⚠️ Dangerous | Start fundraising today — process takes 3–6 months |
| 9–12 | 🟡 Concerning | Begin investor conversations now |
| 12–18 | ✅ Adequate | Prepare fundraise materials in 3–6 months |
| 18–24 | ✅ Healthy | Focus on growth milestones |
| 24+ | 💪 Strong | Well capitalised — consider accelerating spend |
How to Improve Your Results
Break Down Burn by Category
Headcount typically accounts for **60–80% of startup burn**. Break your burn down: people, infrastructure, sales & marketing, and G&A. Knowing the composition tells you exactly where cuts would have the most impact — and which categories to protect during a crunch.
Build a 12-Month Rolling Forecast
Static burn rate ignores planned hires, contract renewals, and revenue growth. Maintain a **rolling 12-month cash model** that you update monthly with actuals. The goal is never to be surprised by your runway.
Start Fundraising at 18 Months Runway
Fundraising takes **3–9 months** from first meeting to wire transfer. Starting at 18 months gives you a buffer if timelines slip. Starting at 6 months means negotiating from desperation — the worst possible position for term sheets.
Track Burn Multiple Monthly
Burn multiple = net burn ÷ net new ARR. **Below 1× is exceptional. 1–1.5× is good. Above 3× is a red flag.** It's one of the clearest signals of whether your spending is translating into sustainable growth.
Cut Costs That Don't Impact Revenue
If you need to extend runway, the priority order is: unused software and subscriptions first, then over-provisioned infrastructure, then non-revenue-critical headcount. **Protect sales, CS, and product** — those directly drive the revenue that reduces your burn.
Frequently Asked Questions
1What is burn rate for a startup?
Burn rate is the speed at which a startup spends its cash reserves. **Gross burn** is total monthly expenses. **Net burn** is monthly expenses minus monthly revenue — the rate at which the bank balance actually decreases. For pre-revenue startups they’re identical; for revenue-generating startups, net burn is the critical number.
2What is a good burn rate for an early-stage startup?
There’s no universal ‘good’ burn rate — it depends on your stage, market, and growth rate. What matters is the **burn multiple and runway**. A startup burning $200K/month is sustainable if it has 24+ months of runway and a burn multiple below 1.5×. The same burn with 4 months of runway is a crisis.
3How do I reduce my startup's burn rate?
Prioritise in this order: (1) **Unused software and services** — audit every subscription monthly; (2) **Infrastructure waste** — right-size cloud spend; (3) **Slow-roll non-critical hires** — use contractors; (4) **Reduce paid marketing** if CAC exceeds LTV. Never cut engineering or customer success — they drive the revenue that reduces burn.
4What is the burn multiple and why does it matter?
**Burn Multiple = Net Cash Burned ÷ Net New ARR Added**. It measures capital efficiency — how much you spend to generate each dollar of new recurring revenue. Below 1× is exceptional; 1–1.5× is good; above 3× suggests you’re spending too much for the growth you’re generating. It was popularised by David Sacks as a more useful metric than raw burn rate.
Conclusion
Cash is oxygen for a startup. Use the free burn rate calculator above to know exactly how long you have, how efficiently you’re spending, and when to start fundraising — before the numbers force the decision for you.