Specialized calculator · B2B SaaS
Runway Calculator for B2B SaaS
Runway is the most critical metric in SaaS. Calculate yours with industry-specific benchmarks and learn what to do if it's running short.
Calculate your runway
The preloaded values are a typical example for B2B SaaS. Replace them with your own.
Net burn rate
Runway
Good cushion. Execute and plan your next milestone.
Typical example for B2B SaaS
A typical post-seed B2B SaaS has ~$1.5M in the bank, burns ~$85k net per month ($35k in MRR against $120k in expenses), and has a runway of 17-18 months.
Healthy runway
18-24 months post-seed
Burn typically concentrated in
70-80% on engineering + sales salaries
Typical cost breakdown for B2B SaaS
Engineering and product
The biggest expense in early B2B SaaS
Sales and marketing
AEs, SDRs, campaigns, outbound tools
Infrastructure (hosting, SaaS tools)
AWS/GCP + Stripe + Datadog + Slack
Operations and G&A
Finance, legal, HR, accounting
Customer Success
Onboarding, support, expansion
Key metrics you should monitor
- CAC payback <12 months
- NRR >110%
- Gross margin >75%
- Burn Multiple <1.5x
- MRR growth >15% monthly (seed)
Common mistakes when calculating runway for B2B SaaS
- Not separating one-time revenue (setup fees) from recurring MRR
- Underestimating true CAC by leaving out the founder's time
- Ignoring collection timing (DSO on enterprise contracts)
- Spending too much on marketing before clear PMF
Frequently asked questions
What's a healthy runway for a B2B SaaS?
The general Silicon Valley rule is 18-24 months post-round. In tighter capital environments (2023-2026), many investors prefer to see 24-30 months as a safety cushion.
How does annual billing affect the calculation?
If you bill annually upfront, your cash balance spikes temporarily but your normalized MRR is still month to month. Separate deferred revenue from operating cash so you don't overstate your real runway.
Runway always up to date, without touching Excel
Hayes Strategic calculates your runway, P&L, and cash flow automatically from your transactions. Built for B2B SaaS.
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