Free engineering calculators for sheet metal fabrication, built by HARSLE press brake and machine-tool engineers. Work out press brake tonnage, V-die opening, bend allowance, springback, shearing and punching force, laser power, metal weight, hydraulic cylinder size and motor current — in metric or imperial units, with formulas, worked examples and reference tables on every page.
- 25 tools
- Free, no sign-up
- Metric & imperial
- Formulas shown
Press Brake & Bending calculators
Tonnage, tooling and flat-pattern calculators for press brake operators and sheet metal designers.
Bending Force CalculatorPress brake tonnage for air bending, bottoming and coining.Open calculator (opens in a new tab) →
V-Opening CalculatorMinimum, optimal and maximum V-die opening for a sheet thickness.Open calculator (opens in a new tab) →
Bend Allowance CalculatorBend allowance, K-factor and flat blank length.Open calculator (opens in a new tab) →
Bend Deduction CalculatorBend deduction, outside setback and flat length.Open calculator (opens in a new tab) →- Min. Flange Length CalculatorShortest flange that still bends cleanly on a V-die.Open calculator (opens in a new tab) →
- Spring Back CalculatorSpringback angle, final radius and overbend for any material.Open calculator (opens in a new tab) →
- Radius Air Bending CalculatorDie selection and final radius for radius-punch bending.Open calculator (opens in a new tab) →
- Bump Bending CalculatorHits, pitch and angle per hit for large-radius step bending.Open calculator (opens in a new tab) →
- Offset CalculatorBend angle and stroke depth for offset (Z-bend) tooling.Open calculator (opens in a new tab) →
- Box Height CalculatorMaximum box height or required upper tool height.Open calculator (opens in a new tab) →
- V-Series Black CalculatorRotary V-die model, minimum flange and angle by thickness.Open calculator (opens in a new tab) →
Shearing, Punching & Laser Cutting calculators
Force, clearance, power and cost calculators for cutting and punching sheet metal.
- Shearing Force CalculatorGuillotine shear cutting force from rake angle and material.Open calculator (opens in a new tab) →
- Cutting Clearance CalculatorShear blade gap setting by material and thickness.Open calculator (opens in a new tab) →
Punching Force CalculatorPunch tonnage and die clearance for any hole shape.Open calculator (opens in a new tab) →- Cluster Saving CalculatorTime and cost saved with cluster (multi-tool) punching.Open calculator (opens in a new tab) →
- Laser Cutting Power CalculatorFiber laser power, speed and gas settings by material.Open calculator (opens in a new tab) →
Material calculators
Weight and thickness tools for quoting, purchasing and handling sheet and plate.
Hydraulics & Electrical calculators
Size hydraulic cylinders and check the power supply before a machine is installed.
- Hydraulic Cylinder Diameter CalculatorBore and rod size, push and pull force, speed.Open calculator (opens in a new tab) →
- Electrical Parameter CalculatorMotor current, breaker, contactor and cable size.Open calculator (opens in a new tab) →
- Global Voltage FinderMains voltage, frequency and plugs for 175+ countries.Open calculator (opens in a new tab) →
Unit Converters calculators
Exact engineering unit conversions for drawings, quotations and machine specifications.
- Force Unit ConverterkN, metric ton-force, kgf, lbf, kip and US tons.Open calculator (opens in a new tab) →
- Pressure Unit ConverterMPa, bar, psi, kgf/cm² and more.Open calculator (opens in a new tab) →
- Length Unit Convertermm, inch, mil, micron, feet and meters.Open calculator (opens in a new tab) →
- Mass and Weight Converterkg, lb, metric, short and long tons.Open calculator (opens in a new tab) →
No calculator matches your search. Try “force”, “bend” or “weight”.
Which calculator do I need?
| Your question | Use this tool |
|---|---|
| How many tons does my press brake need? | Bending Force Calculator |
| Which V-die should I use for this thickness? | V-Opening Calculator |
| How long should the flat blank be? | Bend Allowance or Bend Deduction Calculator |
| How much will the part spring back? | Spring Back Calculator |
| Can my shear cut this plate? | Shearing Force Calculator |
| What punch tonnage does this hole need? | Punching Force Calculator |
| What laser power do I need for 20 mm steel? | Laser Cutting Power Calculator |
| How heavy is this plate or tube? | Metal Weight Calculator |
| What voltage will the machine need in my country? | Global Voltage Finder |
About these calculators
Are the HARSLE calculators free?
Yes. Every calculator is free to use without registration. You can copy the results or share a link that reopens the calculator with the same inputs.
How accurate are the results?
The calculators use standard engineering formulas (for example the 1.42 × UTS air-bending tonnage formula, DIN 6935 K-factor and the Gardiner springback equation) and published reference tables. Results are reliable estimates for planning, quoting and machine selection. Real parts vary with material batch, tooling condition and machine deflection, so confirm critical values with a test bend or your tooling supplier.
Do the calculators support inches?
Yes. All dimension-based calculators have a mm / inch switch. Switching units converts the values you have already entered.
Can I use the results to choose a HARSLE machine?
Yes. The force calculators show the recommended machine capacity including a safety margin. Send the result to HARSLE and our engineers will confirm the press brake, shear, punch or laser model and tooling.
