Calculadora de Queima de Caixa (Burn Rate)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
runway = caixa / burn_rate_mensal
About this calculator
The Cash Burn Rate Calculator helps startups and businesses estimate how many months their current cash will last given a monthly average spend. The calculation is simple: divide the cash balance by the monthly burn rate (total operating expenses). The result, called runway, indicates the time until cash runs out, assuming no new revenue or funding.
How to use: enter the total cash on hand (in your currency) and the average monthly spend (including salaries, rent, marketing, etc.). The calculator returns the number of months of survival. For example, with $100k in cash and $20k monthly spend, the runway is 5 months. This tool is useful for financial planning, fundraising, and cost control.
When to use: ideal for early-stage startups, companies with negative cash flow, or teams needing to prioritize cost cuts. It also helps investors assess a business's financial health. Use before funding rounds or to decide when to seek new revenue.
Cautions: the burn rate can vary month to month; use a 3-6 month average for better accuracy. Also consider recurring revenue, which can extend the runway. The calculator does not replace a projected cash flow statement but provides a quick view of financial urgency.
Frequently asked questions
What is cash burn rate?
It is the average amount your company spends per month, including all operating expenses. It measures how fast cash is being consumed.
How do I calculate my startup's runway?
Divide the total cash available by the monthly burn rate. The result is the number of months until the money runs out, assuming no new revenue.
What's the difference between gross and net burn rate?
Gross burn rate is total expenses only. Net burn rate subtracts recurring revenue, showing the actual cash consumption.
How many months of runway is considered safe?
Typically, 12 to 18 months is recommended for startups. Less than 6 months indicates urgency to cut costs or raise funds.
Can I use this calculator for companies that already have revenue?
Yes, but it's better to use net burn rate (expenses minus revenue). The calculator only considers expenses, so actual runway may be longer.