Fabrication Calculators

Free tools for U.S. industrial shops — press brake tonnage, CNC feed rate, sheet metal weight, roll forming output, machining cost, and motor sizing. No signup. No ads. Just the numbers.

Free to Use NEC & AISC Referenced 7 Tools No Signup Required

Free Calculators

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NEC

Code-Referenced Results

How to Use These Fabrication Calculators

Every calculator on this page follows a Inputs → Formula → Code Reference → Action workflow. You enter your job parameters, the tool runs the engineering formula, surfaces the relevant code reference (NEC, AISC, or industry standard), and shows you exactly what to order, set, or buy.

The sequence below is the typical order of operations for quoting and setting up a new fabrication job — from raw material through electrical hookup.

1 Weight & Material

Start with the Sheet Metal Weight Calculator to confirm material weight for freight quotes, crane picks, and coil inventory planning. Supports all common alloys and gauges.

2 Bending & Forming

Run the Press Brake Tonnage Calculator before setting up a bend. Verify your machine can handle the job — tonnage overload is the #1 cause of tooling damage and frame fatigue.

3 Machining Speeds

Use the CNC Feed Rate Calculator to dial in RPM and IPM for your tool and material. Correct chip load extends tool life dramatically and improves surface finish.

4 Job Costing & ROI

Run the CNC Machining Cost Calculator before you quote. Then use the ROI Calculator to justify new equipment purchases with real payback numbers.

5 Roll Forming Output

The Roll Forming Estimator helps production planners schedule coil changes, downtime, and shift output targets for metal roofing and panel lines.

6 Electrical Hook-Up

Once the machine is on the floor, the 3-Phase Motor Sizing Calculator gives your electrician the exact wire AWG, breaker size, and overload relay setting per NEC 430.

💡 Pro Tip — Start with Code, Not Guesswork

All results from these tools are based on NEC Article 430, AISC standards, or published industry formulas. Use them for planning and pre-engineering, but always have a licensed electrician or P.E. verify final designs before installation. The tools are intentionally conservative — that's intentional, not a bug.

Using calculator results responsibly

Turn the result into a verified shop decision

1. Check the inputs

Use measured dimensions, current labor and machine rates, and the correct material or process assumptions.

2. Compare with machine limits

Confirm the result against the machine manual, tooling data, applicable code requirements and available capacity.

3. Validate before production

Run a controlled test, record the actual outcome and revise the planning value when shop evidence differs.

Frequently Asked Questions

Yes — all tools on this page are completely free. No account, no email, no paywall. They run entirely in your browser, so your job data never leaves your computer.

For a complete sheet metal quote, use three tools in sequence: (1) Sheet Metal Weight Calculator to price material, (2) Press Brake Tonnage Calculator to confirm your machine can run the job, and (3) CNC Machining Cost Calculator to build a per-part price that covers your overhead and labor.

The calculator uses the standard air-bending tonnage formula and published tensile strength values for common materials. Results are typically within ±10% of measured tonnage. Actual force varies with material heat lot, die condition, and machine calibration. Always apply a safety factor and never exceed 80% of your press brake's rated tonnage for production runs.

Yes. The CNC Feed Rate Calculator handles both milling (RPM from tool diameter and SFM) and turning (RPM from workpiece diameter and SFM). Select the appropriate operation type in the tool's input panel. For turning, feed rate is expressed in IPR (inches per revolution) rather than IPM.

The 3-Phase Motor Sizing Calculator uses NEC Table 430.250 for full-load current (FLC) values, which are required for conductor sizing (NEC 430.22) and breaker sizing (NEC 430.52). The overload relay setting uses the formula-calculated FLA per NEC 430.32. For 480V systems, the calculator automatically references the 460V column, as required by NEC 430.6(A)(1).

Yes. Every calculator on TWC Industrial is fully responsive and designed for shop-floor use on phones and tablets. No app download required — open the tool in any modern browser and bookmark it for quick access.

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