Forge Temperature Guide Calculator
Look up forge temperatures in °F and °C for steel and other metals.
Covers key heat ranges and color-to-temperature reference from black heat to white heat.
Forge temperature is critical in blacksmithing. Every metal has a specific range where it becomes plastic enough to shape without cracking or burning. Working outside this range risks ruining the workpiece or creating dangerous conditions.
Forging Temperature Ranges by Metal
| Metal / Alloy | Forging Range (°F) | Forging Range (°C) | Color at Temp |
|---|---|---|---|
| Mild Steel (1018) | 1,700–2,200°F | 927–1,204°C | Orange to light yellow |
| Medium Carbon (1045) | 1,600–2,100°F | 871–1,149°C | Dark orange to light yellow |
| High Carbon (1095) | 1,500–1,900°F | 816–1,038°C | Bright cherry red to yellow |
| Tool Steel (W1) | 1,500–1,950°F | 816–1,066°C | Bright cherry red to yellow |
| Wrought Iron | 1,800–2,300°F | 982–1,260°C | Light orange to white |
| Copper | 1,200–1,650°F | 649–899°C | Dark cherry to dark orange |
| Bronze | 1,100–1,500°F | 593–816°C | Dark red to bright cherry |
| Aluminum | 750–900°F | 399–482°C | No visible color change |
| Damascus (layered) | 1,800–2,300°F | 982–1,260°C | Light orange to white (welding heat) |
The colors above are read off the steel heat color chart, where bright cherry red is 1,500°F, orange is 1,725°F, yellow is 1,975°F and white starts at 2,300°F. Judge them in subdued light. In bright sun a bar at dark red heat can look black.
Key Temperatures to Know
- Black heat: ~400–500°F (204–260°C). The metal is hot but shows no visible glow. Do NOT hammer high-carbon steel at this temperature, it will crack.
- Burning point: Above the forging range, grain boundaries begin to oxidize. The steel literally burns and is permanently ruined. For 1095 steel, this begins around 1,950°F (1,066°C).
- Forge welding heat: 2,100–2,350°F (1,149–1,288°C) for mild steel. The surface becomes “sweaty” or sparking.
Worked Example: Forging a 1095 High-Carbon Knife Blade
Target forging temperature: 1,700°F (927°C), which reads as orange on the color chart. Burning temperature: 1,950°F (1,066°C). Working at 1,700°F leaves you 250°F of room.
The calculator quotes a tighter margin than that on purpose. It measures from the top of the published forging range, 1,900°F for 1095, which leaves only 50°F before the grain boundaries start to oxidize. That is the number that matters if you push the heat, and 1095 is a steel that punishes it.
You should pull the steel from the forge when it glows a consistent bright orange-yellow and return it to the forge when it drops to a dull red (~1,200°F / 649°C). This gives you roughly 15–30 seconds of working time per heat on a 1/4" thick blade.
Fuel Considerations
| Fuel Type | Max Temp Achievable | Notes |
|---|---|---|
| Charcoal | ~2,400°F (1,316°C) | Traditional, clean, easy forge welding |
| Bituminous Coal | ~2,800°F (1,538°C) | Hottest solid fuel, needs good airflow |
| Propane (1 burner) | ~2,100°F (1,149°C) | Convenient, may struggle with forge welding |
| Propane (2 burner) | ~2,400°F (1,316°C) | Can forge weld with proper insulation |
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This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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