A growing burn turns 6.8 months of cash into 5.6
Runway and Burn Calculator
The bank balance says how much. The burn says how fast. Runway is the two together, and the version where the burn keeps growing is the one to plan on.
Runway and Burn Calculator
Months of cash on the burn you have, and on the burn you are actually heading for.
The conventions this uses
Runway is measured on net burn, cash out less cash in. Gross burn runway is a number nobody can spend.
The growing figure compounds the net burn monthly and asks when the cash line crosses zero. That is the honest version, and it is always the shorter one once you have more than a month of cash.
Cash means cash. The undrawn part of a facility is headroom you can ask for, not money in the runway.
Take the workbook
The same calculation month by month in Excel, so you can see the balance fall rather than take a formula's word for it.
Download the workbookFAQs
Can’t find the answer you’re looking for? Please chat to our friendly team.
We provide bookkeeping, VAT returns, payroll, tax filings, annual accounts, and advisory services — tailored to freelancers, SMEs, and ecommerce businesses.
Yes. Every client works with a named accountant who knows your business inside out. You’ll never deal with call centres — just direct, personal support.
We’re certified partners with Xero and QuickBooks. Our digital-first approach means you’ll always have real-time access to your financial data.
We offer fixed monthly packages with no hidden fees. Pricing depends on your business size and the level of support you need — but you’ll always know exactly what you’re paying for.
Absolutely. We handle VAT, corporation tax, self-assessments, and payroll tax. We also manage HMRC correspondence on your behalf to ensure you never miss a deadline.
No. While many of our clients are London-based, we also support businesses across the UK and ecommerce sellers worldwide through our cloud-based systems.
RESOURCES
Fresh takes on business and accounting.
Trading profit is split on a time basis. Interest, rent, gains, donations and dividends each follow their own rule, and mixing them up misstates both accounting periods.
A long period of account needs two separate capital allowances computations, and since April 2026 they are not even calculated at the same writing down rate.
Company law allows accounts to run for 18 months; corporation tax never allows an accounting period longer than 12. Here is how the split is drawn.
CONTACT
Get in touch
