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

fire on brown fire pit
fire on brown fire pit

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📏 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):
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✂️ 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
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🔹 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:
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🔹 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.