Structural calculation software that reads like a hand calculation

Equation Pad lets structural engineers write calculations the way they would on paper: loads, bending moments, section properties and member checks, with real units and typeset equations that a checker can follow line by line.

Try the beta version Plans and prices

Write the calculation, not formulas in hidden cells

Type w := 12 kN/m, L := 6 m and M := w*L^2/8 = kN*m, and the sheet shows the typeset equation and the answer, 54 kN·m. Change the span and every line below updates at once.

Because the working is visible, a checker reads it like a hand calculation instead of hunting through spreadsheet formulas.

Units are checked for you

Every value can carry a unit. kN, kN/m, kN·m, N/mm², MPa, mm⁴ and hundreds more are built in, and you can add your own. Adding a force to a moment gives an error instead of a wrong number, and any result can be shown in the unit you ask for.

Everything a structural calculation needs on one sheet

• Equations with units, functions and checks such as sigma <= f_y that show TRUE or FALSE.
• Matrices for stiffness methods, with inverse, determinant and linear solving.
• A spreadsheet for load tables and member schedules, whose cells feed the maths.
• A 2D/3D drawing editor for details and sections, and a drawing board for quick load sketches.
• Graphs of shear force, bending moment or any function.
• Program blocks for loops and decisions, such as checking several load cases.

Ready to issue

Each sheet carries a title block with your company logo, project, job number and sign-off boxes, on squared paper with a footer you design. Make a PDF at true paper size or a .docx document in one click.

Equation Pad does not apply any design code for you: you write the method of the code you work to, and the result must be checked by a competent engineer.

Also used for

• Worked examples
• Calculation sheets
• Report generator
• Online calculation pad
• Unit calculator
• Matrix calculator
• Equation solver
• Graph plotter
• Spreadsheet with units
• For students
• Beam deflection
• Section properties
• Euler buckling
• Truss analysis
• Stiffness matrix method
• Natural frequency
• Principal stresses
• Pipe flow head loss
• Heat transfer, U-value
• Cable sag and tension
• Civil and mechanical
• Private and local
• .eqnpad files

Equation Pad runs in your browser, with nothing to install, and we never see or store your calculations. Results must be checked by a competent person before they are relied on; see the disclaimer.

Try the beta version Read the user guide