Fire Pit Lava Rock Calculator


  • Use 3" of lava to properly cover a Crossfire Burner

4-Sided Fire Pits

Width of the area to be filled in inches (in.)

Length of the area to be filled in inches (in.)

Depth of the area to be filled in inches (in.)

0 Pounds

Circular Fire Pits

Diameter of the area to be filled in inches (in.)

Depth of the area to be filled in inches (in.)

0 Pounds


Tom Tomsen

This is an amazing product - you will not find any better fire pit or flame. We love sitting around the fire each night with the sunset. AND the service of Amy and Jonathan is unbelievable!!! They make sure everything is accurate and answer questions and do problem solving and do it all within 24 hours. Amazing! You will be very satisfied.

Andrew DeBalko

If you are searching for the right burner for your fire pit you MUST contact Montana Fire Pits. Whether it is an email or a phone call, Jonathan is quick to respond and assist with any question you may have. I just ordered a Warming Trends burner and the process was simple from start to finish. Montana Fire Pits website is easy to navigate and very helpful as well. I also checked out a few of Jonathan's videos on YouTube that explain installation and set up. He is so willing to help and answer any question you may have. It is nice to have someone that is so helpful and passionate about what he does. Order a burner or anything related to your fire pit from Montana Fire Pits.

Dale Gall

Ordered the natural gas 300k BTU burner and I can't believe the flame output and warmth. Had a delay in production due to Warming Trends getting inundated with orders. There is a reason! Best fire pit burner on the market! Order through Montana Fire Pits to receive the best customer service in the industry. Amy kept me informed during the delay and answered questions I had within minutes. Would do business with Jonathan and Amy in an instant!


Montana Fire Pits offers multiple options to suit our customers’ diverse need of outdoor fire pit kits and accessories. From top-of-the-line American made perfection to basic, entry-level and efficient fire bowls for your backyard patio, we offer an opportunity for each and every one of you.

We recognize that fire pits are more than keeping you warm in cold weather, they are an instrument of togetherness that adds exceptional value to your outdoor living space. Because of that, we have chosen only the finest complete fire pit manufactures and assembled a stellar collection of styles, materials, and functions to meet the preferences of our unique blend of customers.

Montana Fire Pits
satisfaction guarantee
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