# SaaS Burn Rate & Runway Calculator Determine monthly burn rate, growth-adjusted runway, and revenue targets needed to reach break-even cash flow for your SaaS startup. --- - **Canonical URL:** https://dothecalculation.com/calculators/saas-burn-rate-calculator - **Category:** Business tools - **Publisher:** Do The Calculation (https://dothecalculation.com) - **Cost:** Free, no account or sign-up required - **Privacy:** Runs entirely in the browser; inputs are never sent to a server - **Methodology:** https://dothecalculation.com/methodology --- ## Estimate startup burn rate and runway timelines Input your cash balance, monthly operating expenses, recurring revenues, and growth projections to evaluate your months of cash runway and break-even targets. - Gross and net burn metrics - Growth-adjusted runway curves - Break-even revenue projections ## Managing Startup Burn Rates and Capital Efficiency For software-as-a-service (SaaS) founders and startup finance teams, managing the cash burn rate is a vital operational discipline. The burn rate represents the speed at which a company consumes its cash reserves to fund operations before reaching positive cash flow. Gross burn rate represents the total monthly operating cash expenses, such as rent, salaries, server hosting, and marketing. Net burn rate represents the actual cash loss, calculated as gross burn minus monthly recurring revenue (MRR). Monitoring both metrics is key to solvency. Capital efficiency measures how much revenue a startup generates per dollar of cash burned. High efficiency means the company is building product value and customer acquisition assets without wasting capital, extending its operational timeline. ## Calculating Your Cash Runway and Growth-Adjusted Projections Cash runway is the number of months a startup can survive before running out of money, assuming revenue and expenses remain constant. The flat runway is calculated by dividing the current cash balance by the monthly net burn rate. In reality, revenue grows over time, which reduces the monthly net burn and extends the runway. A growth-adjusted runway simulator models this dynamically by increasing MRR month-by-month using an expected growth rate percentage. For startups, having a runway of less than 6 months is a critical warning sign. It requires immediate action, such as executing cost reductions, raising venture capital, or using a [break-even calculator](/calculators/break-even-calculator) to plan revenue targets. ## Pathways to Cash Flow Break-Even Reaching cash flow break-even is the ultimate objective for any bootstrapped or venture-backed startup. At break-even, monthly recurring revenue equals monthly operating expenses, meaning net burn is zero and the runway becomes infinite. To achieve break-even, founders can either reduce operating costs or accelerate MRR growth. Using tools like a [project cost calculator](/calculators/project-cost-calculator) helps forecast resource allocations to prevent unexpected project overruns from blowing your budget. It is also essential to track working capital. Startups often face timing gaps between paying supplier invoices and receiving customer subscription payments, which can cause cash shortages even if the business is technically profitable. ## How to Use This Calculator Enter your current cash balance, monthly gross expenses, current MRR, and your expected monthly MRR growth rate. The calculator subtracts MRR from expenses for net burn, divides cash balance by net burn for flat runway, then simulates MRR compounding month by month at your growth rate to find a growth-adjusted runway that accounts for revenue catching up to expenses. ## Worked Example: $500,000 Cash, $18,000 MRR An early-stage SaaS company has $500,000 in cash, $45,000 in monthly expenses, $18,000 in MRR, and expects 8% monthly MRR growth. Net burn: $45,000 − $18,000 = $27,000/month. Flat runway (assuming no growth): $500,000 ÷ $27,000 ≈ 18.5 months. With 8% monthly compounding, MRR crosses $45,000 well within the simulation window, meaning the growth-adjusted runway extends to break-even before the cash ever runs out — a materially better picture than the flat 18.5-month estimate. ## Related Calculators Model the revenue side of that growth curve with the [SaaS cohort LTV calculator](/calculators/saas-ltv-cohort-calculator), or check overall spending discipline with the [operating margin calculator](/calculators/operating-margin-calculator). ## Frequently asked questions ### What is startup burn rate? Burn rate is the rate at which a company consumes its cash reserves to cover operating expenses, usually measured on a monthly basis. ### What is the difference between gross and net burn? Gross burn is the total amount of cash spent on monthly operating costs, while net burn is the actual cash lost (expenses minus revenue). ### How is flat cash runway calculated? Runway in months is calculated by dividing the current cash balance by the monthly net burn rate. ### What is a growth-adjusted runway? A runway calculation that factors in recurring revenue growth over time, which reduces net burn and extends the cash timeline. ### What is a safe cash runway length? A safe runway is typically 18 to 24 months, giving the team enough time to execute growth plans or raise the next round of funding. ### How does MRR growth extend runway? As monthly recurring revenue increases, the gap between expenses and revenue shrinks, reducing net burn and preserving cash. ### What should I do if my runway is under 6 months? Focus on reducing discretionary expenses, delaying hiring, optimizing pricing margins, or closing a bridging funding round immediately. ### How do capital expenditures impact burn rate? One-off capital expenditures (like buying servers or office renovations) increase gross burn in the month they occur and must be factored into cash flow forecasts. ### Can a startup have a negative burn rate? Yes, if revenue exceeds operating expenses, the net burn is negative, meaning the company is profitable and accumulating cash. ### What is cash flow break-even? The point at which monthly cash receipts (revenues) equal monthly cash disbursements (expenses), resulting in zero net burn. ### Does depreciation impact cash burn? No, depreciation is a non-cash accounting expense. Burn rate is purely focused on actual cash inflows and outflows. ### How often should founders calculate burn rate? Founders should monitor cash balances weekly and compute burn rate and runway monthly to catch negative trends early. ## Related concepts - **Net Burn Rate** — The rate at which a business loses cash, calculated as total expenses minus revenues. - **Capital Efficiency** — The ratio of net revenue growth to net cash burned during a specific period. - **Runway** — The amount of time a company has before it runs out of cash, assuming cash flow remains constant. ## Related guides - [Break-Even Analysis: Formula, Example, and Calculator](https://dothecalculation.com/blog/business/break-even-analysis) — Calculate break-even units and revenue from fixed costs, selling price, and variable cost, then test how pricing or cost changes affect the result. ## Related calculators - [Break-Even Calculator](https://dothecalculation.com/calculators/break-even-calculator) — Calculate the exact units or revenue needed to cover fixed and variable costs and find your break-even point before turning a profit. - [Debt Service Coverage Ratio (DSCR) Calculator](https://dothecalculation.com/calculators/dscr-calculator) — Calculate Debt Service Coverage Ratio and surplus cash flow to analyze your ability to repay loans and qualify for new financing. - [Retail Open-to-Buy (OTB) Planner](https://dothecalculation.com/calculators/open-to-buy-calculator) — Plan monthly inventory purchasing budgets from sales forecasts, markdowns, and inventory targets to avoid overstock and stockouts. - [Working Capital & Liquidity Calculator](https://dothecalculation.com/calculators/working-capital-calculator) — Measure business liquidity with working capital, current ratio, quick ratio, cash ratio, and Days Inventory Outstanding calculations. - [Days Sales Outstanding (DSO) Calculator](https://dothecalculation.com/calculators/days-sales-outstanding-calculator) — Calculate Days Sales Outstanding and accounts receivable turnover ratio to measure how efficiently your business collects customer payments. - [Depreciation Calculator](https://dothecalculation.com/calculators/depreciation-calculator) — Estimate annual and accumulated depreciation of business assets using straight-line or declining balance methods for accurate accounting. --- _This calculator is for educational and business planning purposes only and does not constitute professional financial, tax, or legal advice. Verify all rates, margins, and contract terms before making operational business decisions._ --- _Source: [Do The Calculation](https://dothecalculation.com/calculators/saas-burn-rate-calculator). Quote freely with attribution and a link to this page._