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.
Kalkulator siły zginającejPress brake tonnage for air bending, bottoming and coining.Open calculator (opens in a new tab) →
Kalkulator otwarcia VMinimum, optimal and maximum V-die opening for a sheet thickness.Open calculator (opens in a new tab) →
Kalkulator naddatku na zginanieBend allowance, K-factor and flat blank length.Open calculator (opens in a new tab) →
Kalkulator odliczeń od zakrętówBend 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) →
- Kalkulator sprężyny powrotnejSpringback angle, final radius and overbend for any material.Open calculator (opens in a new tab) →
- Kalkulator gięcia promieniowego w powietrzuDie selection and final radius for radius-punch bending.Open calculator (opens in a new tab) →
- Kalkulator gięcia uderzeniowegoHits, pitch and angle per hit for large-radius step bending.Open calculator (opens in a new tab) →
- Kalkulator przesunięciaBend angle and stroke depth for offset (Z-bend) tooling.Open calculator (opens in a new tab) →
- Kalkulator wysokości pudełkaMaximum box height or required upper tool height.Open calculator (opens in a new tab) →
- Kalkulator V-Series BlackRotary 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.
- Kalkulator siły ścinającejGuillotine shear cutting force from rake angle and material.Open calculator (opens in a new tab) →
- Kalkulator odstępu cięciaShear blade gap setting by material and thickness.Open calculator (opens in a new tab) →
Kalkulator siły uderzeniaPunch tonnage and die clearance for any hole shape.Open calculator (opens in a new tab) →- Kalkulator oszczędności klastraTime and cost saved with cluster (multi-tool) punching.Open calculator (opens in a new tab) →
- Kalkulator mocy cięcia laserowegoFiber 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.
- Kalkulator średnicy cylindra hydraulicznegoBore and rod size, push and pull force, speed.Open calculator (opens in a new tab) →
- Kalkulator parametrów elektrycznychMotor current, breaker, contactor and cable size.Open calculator (opens in a new tab) →
- Globalny lokalizator napięciaMains 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.
- Konwerter jednostek siłykN, metric ton-force, kgf, lbf, kip and US tons.Open calculator (opens in a new tab) →
- Konwerter jednostek ciśnieniaMPa, bar, psi, kgf/cm² and more.Open calculator (opens in a new tab) →
- Konwerter jednostek długościmm, inch, mil, micron, feet and meters.Open calculator (opens in a new tab) →
- Konwerter masy i ciężarukg, 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? | Kalkulator siły zginającej |
| Which V-die should I use for this thickness? | Kalkulator otwarcia V |
| How long should the flat blank be? | Naddatek na zginanie Lub Kalkulator odliczeń od zakrętów |
| How much will the part spring back? | Kalkulator sprężyny powrotnej |
| Can my shear cut this plate? | Kalkulator siły ścinającej |
| What punch tonnage does this hole need? | Kalkulator siły uderzenia |
| What laser power do I need for 20 mm steel? | Kalkulator mocy cięcia laserowego |
| How heavy is this plate or tube? | Kalkulator wagi metalu |
| What voltage will the machine need in my country? | Globalny lokalizator napięcia |
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.
