Learn · guide

How to use the masonry wall calculator

A brick or block wall under vertical load and wind: what each input means, how to read f_k, β and the lateral check, and when the modular factor applies.

All guides Inputs Result Calc sheet Walk-through Mistakes

1. What the calculator does

The masonry wall calculator checks a brick or block wall for vertical load and for wind on its face. It works out the characteristic strength f_k from the unit and the mortar, the slenderness and the eccentricity, the capacity reduction β and the vertical resistance per metre, then checks the panel under wind with the flexural strengths and the moment coefficients. Single leaf, cavity and collar-jointed walls are covered, and reinforced walls, lintels and bond beams, columns and shear walls to SANS 10164-2.

The code routes are SANS 10164-1, BS 5628-1 and Eurocode 6 (EN 1996-1-1). The badge says it plainly: every strength is an input with a cited default, to confirm before sign-off.

Masonry wall calculator header with the PASS badge — The header: PASS 56 %, governed by the lateral check (moment parallel to the bed joints).

2. The inputs, group by group

Input	What it means	Typical value
Wall	Design code and design type: unreinforced, or one of the reinforced options.	SANS 10164-1, unreinforced
Geometry	Construction (single leaf, cavity with one or both leaves loaded, collar-jointed), thickness, clear height and the effective height factor ρ.	single leaf, 190 mm, 2700 mm, ρ 0.75
Masonry	The unit (standard brick, hollow or solid block), unit strength, mortar class and strength.	brick, f_u 14, class II
Unit size	Under More inputs: the unit height and width (the page opens at a standard brick, 73 × 106) and the 90 × 90 modular brick choice, No by default.	73 × 106, modular No
Loads	Factored axial load N_Ed per metre and its eccentricity, the panel length and the wind pressure on the face.	120 kN/m, e_x 7, L 3.6 m, 0.7 kPa

Masonry wall inputs: wall, geometry, masonry and loads — The inputs. ρ 0.75 (enhanced) needs a concrete floor or roof bearing on the wall at both ends; use 1.0 if in doubt.

3. How to read the result

The wall sketch shows the vertical load with its eccentricity on the wall section, and the panel under wind with its support edges.

Wall under vertical load and the lateral panel under wind — Vertical load (f_k 5.1 MPa, β 0.957) and the lateral panel under wind, governing at 56 %.

The design values card is the calculation in order. On the left the vertical check: f_k, the material factor, h_ef and the slenderness ratio, the eccentricities, β, N_Rd against N_Ed. On the right the lateral check: the section modulus, the moments applied in each direction against the resistances, and the lateral utilisation. The EN 1996 row is an alternative value for comparison.

Design values card for vertical and lateral checks — Design values: f_k 5.1 MPa, SR 10.66, β 0.957, N_Rd 265 kN/m against 120 (45 %); lateral 56 %.

The badge names the governing check; here the lateral moment parallel to the bed joints. Walls with light vertical load often fail under wind first, because the load that would help hold them straight is small. Anything the engine could not run shows as NOT CHECKED.

Design checks summary for the masonry wall — Design checks: SANS 10164-1 · 8 pass.

4. Calc sheet and summary

The result (pass / fail and utilisation) stays free for everyone. Every check with its clause, the calc sheet and the bending schedule are open to signed-in users. Sign in free: 3 designs a month (one calculator, open for 24 hours). Unlimited with a calculator pack.

The full detail drawings are part of the paid plan. The combined wall summary lists every wall in the project with its code, thickness, f_k, SR, β, N_Rd, utilisations and verdict.

Combined wall summary of all walls — The wall summary: one wall, passing.

5. A 2-minute walk-through

Open the calculator: a 190 mm brick wall, 2.7 m clear height, ρ 0.75, f_u 14 with class II mortar, N_Ed 120 kN/m, wind 0.7 kPa on a 3.6 m panel.
Read the badge: PASS 56 %, lateral.
Change ρ to 1.0 (simple resistance) and see the slenderness and β change.
Change the unit to a hollow block, f_u 7, and set the unit size to 190 × 140 under More inputs.
Make it a cavity wall with one leaf loaded and compare.

6. Common mistakes

The modular factor for bricks that are not modular. Choose “Yes — 90 × 90 modular units” only for real 90 × 90 modular bricks; standard bricks do not get it.
The unit size left at the page default for a block. f_k of a block depends on its height over width; set the real size.
ρ 0.75 without a concrete floor bearing on the wall. Use 1.0 for a timber floor or a roof that does not restrain the top.
Characteristic load as N_Ed. The vertical load is the factored ULS value.
Defaults as data. The flexural strengths and other values are cited defaults; confirm them for your units.

8. Learn more

Try it nowThe calculator opens with the walk-through inputs above. The result is free; sign in for the checks, calc sheet and schedule.
Open the masonry wall calculator

A guide to using the calculator, not a design. Check every value against the current code and your own project, and have the design checked and signed by a registered professional engineer.

Early access

Be first to use STATIX 3D and STATIX 2D.

Leave your email and we will tell you when each part is ready for testing. One confirmation now, one message then. A short monthly update only if you tick the box.