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 Força de FlexãoPress brake tonnage for air bending, bottoming and coining.Open calculator (opens in a new tab) →
Calculadora de abertura em VMinimum, optimal and maximum V-die opening for a sheet thickness.Open calculator (opens in a new tab) →
Calculadora de tolerância de curvaturaBend allowance, K-factor and flat blank length.Open calculator (opens in a new tab) →
Calculadora de dedução de 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 retorno da molaSpringback angle, final radius and overbend for any material.Open calculator (opens in a new tab) →
- Calculadora de curvatura de ar de raioDie selection and final radius for radius-punch bending.Open calculator (opens in a new tab) →
- Calculadora de flexão de colisãoHits, pitch and angle per hit for large-radius step bending.Open calculator (opens in a new tab) →
- Calculadora de compensaçãoBend angle and stroke depth for offset (Z-bend) tooling.Open calculator (opens in a new tab) →
- Calculadora de altura da caixaMaximum box height or required upper tool height.Open calculator (opens in a new tab) →
- Calculadora preta da série VRotary 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 Força de CisalhamentoGuillotine shear cutting force from rake angle and material.Open calculator (opens in a new tab) →
- Calculadora de folga de corteShear blade gap setting by material and thickness.Open calculator (opens in a new tab) →
Calculadora de Força de PunçãoPunch tonnage and die clearance for any hole shape.Open calculator (opens in a new tab) →- Calculadora de economia de clusterTime and cost saved with cluster (multi-tool) punching.Open calculator (opens in a new tab) →
- Calculadora de potência de corte a laserFiber 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 diâmetro de cilindro hidráulicoBore and rod size, push and pull force, speed.Open calculator (opens in a new tab) →
- Calculadora de Parâmetros ElétricosMotor current, breaker, contactor and cable size.Open calculator (opens in a new tab) →
- Localizador de Voltagem 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.
- Conversor de Unidades de ForçakN, metric ton-force, kgf, lbf, kip and US tons.Open calculator (opens in a new tab) →
- Conversor de Unidades de PressãoMPa, bar, psi, kgf/cm² and more.Open calculator (opens in a new tab) →
- Conversor de Unidades de Comprimentomm, inch, mil, micron, feet and meters.Open calculator (opens in a new tab) →
- Conversor de Massa e 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 Força de Flexão |
| Which V-die should I use for this thickness? | Calculadora de abertura em V |
| How long should the flat blank be? | Tolerância de curvatura ou Calculadora de dedução de curvatura |
| How much will the part spring back? | Calculadora de retorno da mola |
| Can my shear cut this plate? | Calculadora de Força de Cisalhamento |
| What punch tonnage does this hole need? | Calculadora de Força de Punção |
| What laser power do I need for 20 mm steel? | Calculadora de potência de corte a laser |
| How heavy is this plate or tube? | Calculadora de Peso de Metal |
| What voltage will the machine need in my country? | Localizador de Voltagem 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.
