Skip to main content
Calcimator

Firewall Rule Calculator

Estimate firewall rule count from network zones, services, and segmentation level. Includes complexity assessment and audit time estimation.

Inputs

Results

Total firewall rules

82

Complexity (0-3)

0

Inter/intra-zone rules50
NAT rules6
Management rules18
Security audit time (hrs)6.8
Review interval (days)90
Estimated Latency Us16.4
How to Use This Calculator
  1. Enter the number of network zones (DMZ, LAN, WAN, server zone, etc.).
  2. Set services per zone and select segmentation level (flat, segmented, or microsegmented).
  3. Enter the number of public-facing services that require inbound access rules.
  4. Review total firewall rules, inter-zone rules, NAT rules, and management rules.
  5. Audit existing rulesets quarterly -- unused rules accumulate and increase attack surface.
Ad Placeholder
Ad Placeholder