Press Brake Tonnage Calculator

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About this app

Set up your press brake faster, protect your tooling from over-tonnage, and hit your flange dimensions on the very first bend. Press Brake Tonnage Calculator (FirstBend) is the all-in-one sheet metal bending calculator built for CNC press brake operators, metal fabricators, toolroom leads, and CAD/CAM sheet metal designers.

Whether you are air bending 16-gauge mild steel, forming heavy A36 structural plate on a 250-ton hydraulic brake, or dialing in tight-tolerance 304 stainless and 5052 aluminum enclosures, FirstBend gives you exact forming tonnage, V-die selection, minimum flange length, bend allowance, and bend deduction right on the shop floor.

⚙️ PRESS BRAKE TONNAGE & TOOLING PROTECTION
• Instant Forming Force Calculation: Enter material type, sheet thickness (gauge, inches, or mm), bend length, and V-die opening to calculate required tonnage per foot (or kN per meter) and total press brake load.
• Tensile Strength & Material Presets: Pre-loaded tensile factors for Mild Steel (CRS / HRS / A36), Stainless Steel (304 / 316), Aluminum (5052-H32 / 6061-T6), Galvanized Steel, Brass, and Copper—plus custom tensile strength (PSI / MPa) input for specialty alloys like AR400 or Corten.
• Over-Tonnage Safety Alerts: Prevent crushed punches, sprung machine beds, and cracked V-dies by verifying required air-bending tonnage against your machine and tooling capacity before stepping on the pedal.

📐 V-DIE OPENING, INSIDE RADIUS & MINIMUM FLANGE LENGTH
• Smart V-Die Selector: Automatically recommends optimal V-die openings (6x, 8x, 10x, or 12x material thickness rules) based on alloy and plate thickness—including the classic 8x rule of thumb for cold-rolled steel and wider openings for stainless and high-tensile plate.
• Air Bending Inside Radius: Estimates natural air-formed inside bend radius directly from your chosen V-die opening (~15%–20% V-opening rules adjusted for springback and tensile strength).
• Minimum Flange Length Calculator: Shows the exact minimum leg / flange dimension required to span the V-die shoulder safely at 90° or acute angles so your workpiece never slips into the die.

📏 BEND ALLOWANCE, BEND DEDUCTION & K-FACTOR FLAT PATTERN
• Complete Flat Blank Development: Calculate Bend Allowance (BA), Bend Deduction (BD), and Outside Setback (OSSB) for any bend angle—acute bends, standard 90° bends, or obtuse bends.
• True Shop-Floor K-Factor Calibration: Adjust K-factor and inside radius manually to match your CAD unfold settings (SolidWorks, Inventor, AutoCAD, Fusion 360), or use FirstBend Pro's test-bend calibration—measure a single trial coupon on your brake to back-calculate your exact machine-and-die K-factor and bend deduction.
• Multi-Bend Flat Length Sum: Combine multiple flange lengths and bend deductions to verify total flat pattern cut length before laser cutting, plasma cutting, or shearing.

🛠️ BUILT FOR FABRICATION SHOPS — IMPERIAL & METRIC, 100% OFFLINE
• Seamless Unit Switching: Work in US Imperial (Inches, Sheet Metal Gauge, US Tons, Tons/ft) or Metric (mm, kN, Metric Tonnes, t/m) with instant one-tap conversion.
• Built-In Sheet Metal Gauge Chart: Quick conversion between standard gauge numbers (7 ga to 28 ga) and decimal inches / millimeters for steel, stainless, galvanized, and aluminum.
• Saved Machine & Die Setups: Store your shop's standard punch/V-die combinations and verified bend deductions for repeat production runs.
• 100% Offline & Ad-Free: Runs locally in metal fabrication shops and factories with zero internet connection, no account sign-ups, and no distracting ads.

Compatibility Notice: Designed for universal air-bending and press brake tooling setups across standard American, European, and New Standard style punches and V-dies.

What’s new

Fixes the FirstBend Pro purchase on Google Play: checkout could fail with an error instead of opening, and the price was not read from the store. Also improves the readability of primary buttons.