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.
Calculadora de fuerza de flexiónPress brake tonnage for air bending, bottoming and coining.Open calculator (opens in a new tab) →
Calculadora de apertura en VMinimum, optimal and maximum V-die opening for a sheet thickness.Open calculator (opens in a new tab) →
Calculadora de subsidio de curvaturaBend allowance, K-factor and flat blank length.Open calculator (opens in a new tab) →
Calculadora de deducción por curvaturaBend 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) →
- Calculadora de recuperación elásticaSpringback angle, final radius and overbend for any material.Open calculator (opens in a new tab) →
- Calculadora de curvatura de aire por radioDie selection and final radius for radius-punch bending.Open calculator (opens in a new tab) →
- Calculadora de flexión por impactoHits, pitch and angle per hit for large-radius step bending.Open calculator (opens in a new tab) →
- Calculadora de compensaciónBend angle and stroke depth for offset (Z-bend) tooling.Open calculator (opens in a new tab) →
- Calculadora de altura de cajaMaximum box height or required upper tool height.Open calculator (opens in a new tab) →
- Calculadora V-Series NegraRotary 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.
- Calculadora de fuerza de cizallamientoGuillotine shear cutting force from rake angle and material.Open calculator (opens in a new tab) →
- Calculadora de espacio libre de corteShear blade gap setting by material and thickness.Open calculator (opens in a new tab) →
Calculadora de fuerza de perforaciónPunch tonnage and die clearance for any hole shape.Open calculator (opens in a new tab) →- Calculadora de ahorro de clústeresTime and cost saved with cluster (multi-tool) punching.Open calculator (opens in a new tab) →
- Calculadora de potencia de corte por láserFiber 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.
- Calculadora de diámetro de cilindro hidráulicoBore and rod size, push and pull force, speed.Open calculator (opens in a new tab) →
- Calculadora de parámetros eléctricosMotor current, breaker, contactor and cable size.Open calculator (opens in a new tab) →
- Buscador de voltaje globalMains 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.
- Convertidor de unidades de fuerzakN, metric ton-force, kgf, lbf, kip and US tons.Open calculator (opens in a new tab) →
- Convertidor de unidades de presiónMPa, bar, psi, kgf/cm² and more.Open calculator (opens in a new tab) →
- Convertidor de unidades de longitudmm, inch, mil, micron, feet and meters.Open calculator (opens in a new tab) →
- Convertidor de masa y pesokg, 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? | Calculadora de fuerza de flexión |
| Which V-die should I use for this thickness? | Calculadora de apertura en V |
| How long should the flat blank be? | Tolerancia de curvatura o Calculadora de deducción por curvatura |
| How much will the part spring back? | Calculadora de recuperación elástica |
| Can my shear cut this plate? | Calculadora de fuerza de cizallamiento |
| What punch tonnage does this hole need? | Calculadora de fuerza de perforación |
| What laser power do I need for 20 mm steel? | Calculadora de potencia de corte por láser |
| How heavy is this plate or tube? | Calculadora de peso de metales |
| What voltage will the machine need in my country? | Buscador de voltaje global |
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.
