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B2B Enterprise SaaS Runway & Unit Economics Calculator

Model enterprise sales cycle lag, high CAC payback, enterprise ACV, and runway impact for VC/Angel funded SaaS.

Material & Specification Presets

7 Dynamic Pages

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SaaS Cash & Expense Inputs

Live Real-Time Math

Current Bank Balance ($)Liquid Cash Reserves

Monthly Recurring Revenue (MRR)Current Monthly Cash In

MoM Growth Rate (%):+12%

Target Gross Margin (%):78%

Monthly Operating Overhead (OPEX)

Payroll & Founder Salaries ($)

Cloud Infra & LLM API Fees ($)

Marketing & Paid Ads ($)

SaaS Tooling & Admin ($)

Runway & Burn ProjectionsLive Calculation

Net Cash Runway Remaining:

16.9Months

Zero Cash Date: Jan 2028

Gross Monthly Burn:$54,000

Net Monthly Burn Rate:-$26,700 /mo

Projected MRR in 6 Months (+12% MoM):$69,084

Comprehensive Guide: B2B Enterprise SaaS Runway & Unit Economics Calculator

Enterprise B2B SaaS contracts boast high Annual Contract Values (ACV of $25k-$100k+), but suffer from 6 to 12 month long sales cycles. Your runway calculator must model the burn gap between hiring enterprise sales reps and collecting contract cash.

Mathematical Formula Breakdown

Gross Burn = Total Monthly Payroll + Cloud Infra + Sales Pipeline Ads. Net Burn = Gross Burn - Adjusted Gross Margin Revenue. CAC Payback = Sales & Marketing Spend / (New MRR Added × Gross Margin %).

Industry Pricing Benchmarks

Top quartile B2B SaaS companies maintain an LTV:CAC ratio > 3.0x and a CAC Payback Period under 12 months for mid-market or 18 months for enterprise.

Optimization Strategies

Require multi-year upfront payment terms on enterprise contracts to eliminate negative cash flow during implementation.
Track Rep Ramp Time carefully—a sales rep usually takes 4-6 months before producing full quota pipeline.

Frequently Asked Questions

What is an acceptable CAC payback period for B2B SaaS?

For SMB SaaS, 6-12 months is ideal. For Enterprise SaaS with low churn, CAC payback periods up to 18-24 months are acceptable due to high expansion revenue.