How to Build a DIY Metal Fire Pit Ring (Exact Measurements + Step-by-Step)
Building a steel fire pit ring is one of the best beginner welding projects. It’s simple, practical, and teaches core skills like cutting, forming, and welding. This guide gives you exact measurements, cut lengths, and layout steps so you can build it confidently.
4/25/20262 min read
Affiliate Disclosure
This post contains affiliate links. I may earn a small commission at no extra cost to you.
📏 FINAL DIMENSIONS (WHAT YOU’RE BUILDING)
Outer Diameter: 36 inches
Height: 12 inches
Material: 1/8” thick × 4” wide mild steel flat bar
🧮 STEP 1: CALCULATE YOUR STEEL LENGTH
To form a perfect circle, you need the circumference:
Circumference = π × Diameter
3.14 × 36 = 113 inches
👉 Add extra for overlap + trimming:
Final cut length: 115 inches (9 ft 7 in)
🧱 MATERIAL CUT LIST
(1) Steel flat bar:
1/8” thick × 4” wide × 115 inches long
👉 If using shorter pieces:
(2) pieces at 57.5 inches each
🧰 TOOLS YOU’LL NEED
MIG welder
Angle grinder (cutting + grinding discs)
Welding clamps
Tape measure
Marker / soapstone
Safety gear
👉 Best beginner welder (main investment):
Search:
✂️ STEP-BY-STEP BUILD (DETAILED)
🔹 Step 2: Mark Your Cut
Lay your steel flat bar on a stable surface
Measure 115 inches from one end
Mark clearly using a square
👉 Double check measurement before cutting
🔹 Step 3: Cut the Steel
Use an angle grinder with a cutting disc
Cut straight across your marked line
👉 Clean cuts = easier welding later
Search:
🔹 Step 4: Mark Center Reference Points (IMPORTANT)
This helps keep your circle even.
Measure and mark:
Center point at 57.5 inches
Then mark halfway again on each side:
~28.75 inches
~86.25 inches
👉 You now have 4 reference points to guide bending
🔹 Step 5: Begin Forming the Circle
Start bending slowly from one end
Work evenly along the bar
Use a round object (barrel, propane tank, bucket) as a guide
👉 Focus on bending evenly between your marked sections
🔹 Step 6: Bring Ends Together
Continue bending until both ends meet
Adjust shape until it forms a smooth circle
👉 The ends should:
Sit flush
Line up evenly (no gaps)
🔹 Step 7: Clamp the Joint
Use clamps to hold both ends tightly together
Ensure:
Circle is flat on the ground
Ends are aligned
🔹 Step 8: Tack Weld (DO NOT SKIP)
Add 2–3 tack welds along the seam
Check alignment again
👉 Fix any shape issues now — not later
🔹 Step 9: Full Weld
Run a full bead along the joint
Weld slowly for better penetration
👉 This is where a good welder matters most:
Search:
🔹 Step 10: Grind the Seam
Use a grinding disc
Smooth the weld
Remove sharp edges
👉 This improves both:
Safety
Appearance
🔹 Step 11: (Optional) Add Airflow Holes
For better burning:
Mark holes 2 inches from bottom edge
Space holes every 3–4 inches
Drill using 3/8” bit
🔹 Step 12: Final Placement
Place your fire pit on:
Gravel
Stone
Dirt
👉 Avoid:
Wood decks
Grass
🧠 PRO TIPS (IMPORTANT)
Bend gradually — don’t force it
Tack weld first, always
Check roundness before final weld
Use clamps to avoid misalignment
🔥 FINAL THOUGHTS
This is one of the best beginner welding projects because it teaches:
Measuring and layout
Metal forming
Welding fundamentals
Once you’ve built this, you’ll have the skills to move into bigger projects like tables, frames, and workbenches.
