Free tool
Firebreak Width Calculator
Estimate a safe minimum firebreak (control-line) width for your fuel, slope, and wind conditions.
Recommended minimum width
10ft
- Base (Grass / light fuels)
- 12 ft
- Slope factor
- ×1.00
- Wind factor
- ×1.00
Install firebreaks to bare mineral soil, tie them to anchor points, and complete them at least 48 hours before ignition.
Planning estimate only
This calculator is a planning aid, not a regulatory standard or a substitute for trained judgment. Always follow your state and local burn regulations, obtain required permits, check for active burn bans, and consult a certified burn manager for real burns.
Want real-time burn scoring?
These free tools handle the math. BurnAtlas Pro reads live NOAA weather for your location, scores each day 0–100 against professional prescribed-fire standards, and shows you the best days to burn — with full state regulations and permit contacts.