Runway Calculator
Runway is evaluated from Cash on Hand, Monthly Net Burn Rate and Expected Monthly Revenue Growth. The calculation reports Runway, Runway and Start Fundraising By Month.
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About the Runway Calculator
### Why Use the Runway Calculator Calculator?
The Runway Calculator is a vital tool for startups and businesses to assess their financial health and make informed decisions about their future. It helps users calculate how many months of runway they have, determine when to start raising the next funding round, and plan headcount and spending given cash constraints. By using this calculator, businesses can avoid running out of cash, make strategic decisions about funding, and allocate resources effectively. The calculator takes into account the company's cash on hand, monthly net burn rate, and expected monthly revenue growth to provide a comprehensive picture of their financial situation.
### History of the Runway Calculator
The concept of runway calculation has its roots in the early days of venture capital and startup financing. In the 1990s, venture capitalists began using simple cash flow models to estimate how long a startup could survive before needing additional funding. Over time, these models evolved to incorporate more variables, such as revenue growth and burn rates. The modern runway calculator, with its emphasis on cash on hand, net burn rate, and revenue growth, emerged as a standard tool in the startup ecosystem around the mid-2000s. This evolution was driven by the need for more accurate and nuanced financial planning, as well as the increasing importance of cash flow management in the startup world.
### The Science Behind the Calculations
The Runway Calculator uses a straightforward formula to calculate the number of months a company has before it runs out of cash. The formula is: Runway (months) = Cash on Hand / Monthly Net Burn Rate. This calculation assumes a static burn rate, meaning that the company's expenses remain constant over time. If the company expects to generate revenue, the calculator can also take into account the expected monthly revenue growth. The formula for this calculation is: Runway (months) = Cash on Hand / (Monthly Net Burn Rate - Expected Monthly Revenue Growth). The calculator also estimates when the company should start fundraising, based on the number of months until it runs out of cash. The formula for this calculation is: Start Fundraising By Month = Current Month + (Runway (months) - 6), assuming that the company wants to start fundraising at least 6 months before it runs out of cash.
### Real-Life Application and Examples
Let's consider a real-world scenario. Suppose a startup has $2,500,000 in cash on hand, a monthly net burn rate of $180,000, and expects to generate $15,000 in monthly revenue growth. The company wants to know how many months of runway it has, when it should start fundraising, and how many months it has until it runs out of cash. Using the Runway Calculator, the company inputs the following values: Cash on Hand = $2,500,000, Monthly Net Burn Rate = $180,000, and Expected Monthly Revenue Growth = $15,000. The calculator returns the following results: Runway (months) = 13.9 months, Runway (years) = 1.16 years, Start Fundraising By Month = 7.9 months, and Months to Zero Cash (static burn) = 13.9 months. These results tell the company that it has approximately 14 months of runway, and should start fundraising in about 8 months. The company can use these results to plan its headcount and spending, and make informed decisions about its financial future. For example, it may decide to reduce its burn rate, increase its revenue growth, or start fundraising earlier to ensure it has enough cash to achieve its goals.
The Runway Calculator is a vital tool for startups and businesses to assess their financial health and make informed decisions about their future. It helps users calculate how many months of runway they have, determine when to start raising the next funding round, and plan headcount and spending given cash constraints. By using this calculator, businesses can avoid running out of cash, make strategic decisions about funding, and allocate resources effectively. The calculator takes into account the company's cash on hand, monthly net burn rate, and expected monthly revenue growth to provide a comprehensive picture of their financial situation.
### History of the Runway Calculator
The concept of runway calculation has its roots in the early days of venture capital and startup financing. In the 1990s, venture capitalists began using simple cash flow models to estimate how long a startup could survive before needing additional funding. Over time, these models evolved to incorporate more variables, such as revenue growth and burn rates. The modern runway calculator, with its emphasis on cash on hand, net burn rate, and revenue growth, emerged as a standard tool in the startup ecosystem around the mid-2000s. This evolution was driven by the need for more accurate and nuanced financial planning, as well as the increasing importance of cash flow management in the startup world.
### The Science Behind the Calculations
The Runway Calculator uses a straightforward formula to calculate the number of months a company has before it runs out of cash. The formula is: Runway (months) = Cash on Hand / Monthly Net Burn Rate. This calculation assumes a static burn rate, meaning that the company's expenses remain constant over time. If the company expects to generate revenue, the calculator can also take into account the expected monthly revenue growth. The formula for this calculation is: Runway (months) = Cash on Hand / (Monthly Net Burn Rate - Expected Monthly Revenue Growth). The calculator also estimates when the company should start fundraising, based on the number of months until it runs out of cash. The formula for this calculation is: Start Fundraising By Month = Current Month + (Runway (months) - 6), assuming that the company wants to start fundraising at least 6 months before it runs out of cash.
### Real-Life Application and Examples
Let's consider a real-world scenario. Suppose a startup has $2,500,000 in cash on hand, a monthly net burn rate of $180,000, and expects to generate $15,000 in monthly revenue growth. The company wants to know how many months of runway it has, when it should start fundraising, and how many months it has until it runs out of cash. Using the Runway Calculator, the company inputs the following values: Cash on Hand = $2,500,000, Monthly Net Burn Rate = $180,000, and Expected Monthly Revenue Growth = $15,000. The calculator returns the following results: Runway (months) = 13.9 months, Runway (years) = 1.16 years, Start Fundraising By Month = 7.9 months, and Months to Zero Cash (static burn) = 13.9 months. These results tell the company that it has approximately 14 months of runway, and should start fundraising in about 8 months. The company can use these results to plan its headcount and spending, and make informed decisions about its financial future. For example, it may decide to reduce its burn rate, increase its revenue growth, or start fundraising earlier to ensure it has enough cash to achieve its goals.
Formula & How It Works
The calculation applies the following relations exactly as recorded in the metadata: Runway (months) = cash on hand / monthly net burn rate Start fundraising = runway - 6 months (to preserve negotiating leverage) Zero-cash date = today + runway months Each output field is produced by substituting the supplied inputs into the relevant relation and then applying the declared rounding or text format.
Worked Examples
Example 1: Seed-stage startup: $1.8M cash, $120k/month net burn, $15k MoM MRR growth
Inputs
cash_on_hand: 1800000
net_burn_rate: 120000
monthly_revenue_growth: 15000
Runway: 15 months. Runway: 1.25 years. Start Fundraising By Month: 9 months. Months to Zero Cash: 15 months
With Cash on Hand = 1,800,000, Monthly Net Burn Rate = 120,000 and Expected Monthly Revenue Growth = 15,000 as the stated inputs, the result is Runway = 15 months, Runway = 1.25 years and Start Fundraising By Month = 9 months. Each value corresponds to the declared output fields.
Example 2: Series A startup: $4.2M cash, $350k/month net burn, no revenue growth assumed
Inputs
cash_on_hand: 4200000
net_burn_rate: 350000
monthly_revenue_growth: 0
Runway: 12 months. Runway: 1 years. Start Fundraising By Month: 6 months. Months to Zero Cash: 12 months
With Cash on Hand = 4,200,000, Monthly Net Burn Rate = 350,000 and Expected Monthly Revenue Growth = 0 as the stated inputs, the result is Runway = 12 months, Runway = 1 years and Start Fundraising By Month = 6 months. Each value corresponds to the declared output fields.
Example 3: Post-Series B company: $12M cash, $800k/month net burn, growing $100k MRR/month
Inputs
cash_on_hand: 12000000
net_burn_rate: 800000
monthly_revenue_growth: 100000
Runway: 15 months. Runway: 1.25 years. Start Fundraising By Month: 9 months. Months to Zero Cash: 15 months
With Cash on Hand = 12,000,000, Monthly Net Burn Rate = 800,000 and Expected Monthly Revenue Growth = 100,000 as the stated inputs, the result is Runway = 15 months, Runway = 1.25 years and Start Fundraising By Month = 9 months. Each value corresponds to the declared output fields.
Example 4: Bootstrapped company thinking about funding: $450k savings, $35k/month burn, $30k MRR
Inputs
cash_on_hand: 450000
net_burn_rate: 5000
monthly_revenue_growth: 5000
Runway: 90 months. Runway: 7.5 years. Start Fundraising By Month: 84 months. Months to Zero Cash: 90 months
With Cash on Hand = 450,000, Monthly Net Burn Rate = 5,000 and Expected Monthly Revenue Growth = 5,000 as the stated inputs, the result is Runway = 90 months, Runway = 7.5 years and Start Fundraising By Month = 84 months. Each value corresponds to the declared output fields.
Common Use Cases
- Calculate how many months of runway a startup has
- Determine when to start raising the next funding round
- Plan headcount and spending given cash constraints