Burn Rate Discipline: The 3 Numbers Every SaaS Founder Should Know Weekly

Most seed and Series A founders look at burn once a month — when the books close. By then, the damage is already two to four weeks old.

Here are the three numbers we put in front of every DealZephyr client every Monday morning:

1. Trailing 4-week net burn

Smooths out lumpy vendor payments and payroll cycles. If this number drifts up two weeks in a row, something structural is changing.

2. Committed spend (next 60 days)

Not what you've spent — what you've already signed up to spend. Contracts, hiring offers, software renewals. This is the number that kills companies who think they have 14 months of runway.

3. Net new ARR vs. plan (week-to-date)

Burn only matters relative to growth. If ARR is tracking 80% of plan and burn is at 100% of plan, your runway just got 20% shorter — and most founders won't notice for a quarter.

Weekly cadence is the entire game. Monthly is a lagging indicator.

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