Your monthly burn rate is: N/A
Your cash runway is: N/A
Understanding Burn Rate and Cash Runway
For startups, managing cash flow is paramount. The Burn Rate is a crucial metric that measures how quickly a company is spending its capital to finance overhead before generating positive cash flow. It's essentially the rate at which a company "burns" through its cash reserves.
What is Burn Rate?
There are two main types of burn rate:
Gross Burn Rate: This is the total amount of money a company spends in a given period (usually a month), primarily on operating expenses.
Net Burn Rate: This is the difference between the cash a company has spent and the cash it has brought in over the same period. It's a more accurate reflection of how fast your cash balance is decreasing.
This calculator focuses on the Gross Burn Rate for simplicity, representing your total monthly expenditure.
The Math Behind Burn Rate
The formula for Gross Burn Rate is straightforward:
Gross Burn Rate = Total Monthly Operating Expenses
In our calculator, the Monthly Operating Expenses field directly represents this.
What is Cash Runway?
The Cash Runway (or simply "runway") is the amount of time (usually measured in months) a company can continue operating before it runs out of money, assuming its current spending and revenue levels remain constant. It's a critical indicator of financial health and a key factor for investors.
The Math Behind Cash Runway
The formula for Cash Runway, using the Net Burn Rate, is:
Cash Runway = Current Cash Balance / Net Burn Rate
For this calculator, we'll use the Gross Burn Rate as a proxy for Net Burn Rate if no revenue is assumed. If you have revenue, you would subtract your monthly revenue from your monthly operating expenses to get the Net Burn Rate.
Financial Planning: Understand how long your current funding will last.
Investor Relations: Provide clear figures on your financial projections.
Operational Efficiency: Identify if your spending is sustainable.
Decision Making: Inform decisions about fundraising, hiring, and expansion.
Example Scenario
Imagine a startup has $50,000 in monthly operating expenses (rent, salaries, marketing, software subscriptions, etc.) and currently holds $200,000 in cash.
Monthly Burn Rate: $50,000
Cash Runway: $200,000 / $50,000 = 4 months
This means the startup has 4 months to either increase revenue, secure more funding, or cut costs before their cash runs out.
function calculateBurnRate() {
var monthlyExpensesInput = document.getElementById("monthlyOperatingExpenses");
var cashInHandInput = document.getElementById("cashInHand");
var resultDiv = document.getElementById("result");
var monthlyExpenses = parseFloat(monthlyExpensesInput.value);
var cashInHand = parseFloat(cashInHandInput.value);
if (isNaN(monthlyExpenses) || isNaN(cashInHand) || monthlyExpenses < 0 || cashInHand 0) {
runway = cashInHand / burnRate;
} else {
runway = Infinity; // If burn rate is zero or less, runway is theoretically infinite
}
var formattedBurnRate = burnRate.toLocaleString(undefined, { style: 'currency', currency: 'USD' });
var formattedRunway = runway === Infinity ? "Infinite" : runway.toFixed(1) + " months";
resultDiv.innerHTML = "Your monthly burn rate is: " + formattedBurnRate + "" +
"Your cash runway is: " + formattedRunway + "";
}