Business Runway Calculator
Last updated: April 2026
Runway Details
Total cash available across all business accounts.
£
Average monthly revenue received, not invoiced.
£
All monthly outgoings including payroll, rent, software, and other fixed costs.
£
Expected monthly revenue growth. Leave at 0 for a flat scenario.
%
Expected monthly expense growth. Leave at 0 for flat expenses.
%
One-Off Costs
Add planned expenses such as equipment purchases, tax bills, or recruitment costs.
No one-off costs added.
Planned Funding
Add expected injections such as grants, investment, or confirmed loans.
No planned funding added.
You have approximately
10 months
of runway until March 2027.
Burn Rate
Monthly revenue£20,000
Monthly expenses£25,000
Monthly burn rate£5,000.00
Current cash£50,000
Simple runway without growth or one-offs10.0 months
Cash Balance Chart
Month 1Cash balance over timeMonth 60
Monthly Projection Table
Month-by-month cash movement for the next 60 months.
What is business runway?
Business runway is the number of months a company can continue operating before it runs out of cash, based on its current cash balance and monthly burn rate. It is one of the most important metrics for any SME or startup to track. Most financial advisers recommend maintaining at least 3-6 months of runway at all times.
What is burn rate?
Burn rate is the rate at which a business spends its cash reserves. Net burn rate is the difference between monthly expenses and monthly revenue: the amount by which your cash balance decreases each month. Gross burn rate is total monthly expenses regardless of revenue.
How can I extend my runway?
The most effective ways to extend runway are: increasing revenue or accelerating cash collection, reducing expenses, raising new funding, or using invoice finance to release cash tied up in unpaid invoices. Runway extension should be planned well in advance because most funding processes take longer than expected.
What is a healthy runway for a UK startup?
Most investors and advisers recommend maintaining at least 12-18 months of runway for early-stage startups, and 3-6 months for established SMEs. The right amount depends on your stage, growth rate, and how quickly you could raise additional funding if needed.
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