bootstrapped saas monthly net burn rate and runway calculator

When to use this bootstrapped saas monthly net burn rate and runway

Common use cases

• Calculate bootstrapped SaaS net burn and runway from cash, revenue, and opex. Instant, free, no sign up.
• Sanity-check with this case: You have $180,000 cash, $22,000 monthly revenue, and $31,000 opex. Net burn is $9,000/month. Runway is 180,000 ÷ 9,000 = 20 months.
• The relationship is: Net burn = monthly opex − monthly revenue. If net burn > 0, runway months = cash ÷ net burn. If revenue ≥ opex you are not burning (default-alive).

Localized examples

• HR & Ops: the example on this page uses the same formula as the widget.

What you get

• Workspace controls for this exact question
• Net burn = monthly opex − monthly revenue. If net burn > 0, runway months = cash ÷ net burn. If revenue ≥ opex you are not burning (default-alive).
• Example on the page: You have $180,000 cash, $22,000 monthly revenue, and $31,000 opex. Net burn is $9,000/month. Runway is 180,000 ÷ 9,000 = 20 months.

Who this is for

Bootstrapped SaaS founders tracking months of oxygen from cash, revenue, and opex.

Worked example

$180k cash, $22k revenue, $31k opex → $9k net burn → 20 months runway. If revenue covers opex, runway stops being the binding constraint.

Update on a fixed cadence

Recalculate monthly on the same day. Pre-commit cut actions at runway milestones so decisions are not improvised in panic.

Common pitfalls

• Counting unsettled receivables as cash
• Excluding owner draws or annual tax payments from burn