Minimum ladder length
0.0m Round up to the next available ladder size.Leaning ladder length calculator
Choosing the correct ladder length
When you select a ladder, one of the common mistakes is to choose one that is not long enough. This calculator is based on a conventional leaning ladder such as a push-up multi section extension ladder at a one-in-four lean angle, which equates to roughly 76 degrees from the horizontal plane.
A one-in-four lean angle means the base should sit one metre out for every four metres of vertical height. Never attempt to use a ladder intended for 1-in-4 at a steeper or shallower angle, and never use a ladder as a bridge.
Ladder Length Calculator
Leaning ladder length calculator based on the 1-in-4 lean angle. Do not forget the additional length required if you intend stepping off onto a landing place.
m
0.5m
8m
m
Base distance from wall
0.0m One metre out for every four metres up.Lean angle
76° Equivalent to about 76 degrees from horizontal.
Vertical height
0.0m
Ladder length
0.0m
Landing overhang
0.0m
1-in-4 setup
Base distance = vertical height ÷ 4 Lean angle: 76°Trigonometry check
Ladder length = vertical height ÷ sin 76° Add landing overhang if stepping off onto a landing place.Alternatively, you can use trigonometry: sin 76° = opposite / hypotenuse.
There are exceptions. We also manufacture ladders for access to shelving and industrial loft ladders with deeply ribbed flat treads set at 67 degrees. These are made from stepladder materials and are specifically designed to be used at this reduced lean angle.
If in doubt, get in touch and we will be happy to recommend the correct ladder for your purpose.
Need something tailored?
Need a tweak, customisation or advice?
If you need a product adapted, a bespoke version made, or just want to check you are ordering the right thing, we are happy to help.
Send over your dimensions, photos, drawings or a quick outline of what you need and we will point you in the right direction.
- Questions about fit, size or suitability
- Custom ladder, platform or access changes
- Help matching the right product to the job
Get in touch
Tell us what you need
Use the contact form to tell us what needs changing, what you are unsure about, or what your site needs demand.
Prefer to call or email?
We can help directly
If it is easier, use the direct contact details below and we will help you from there.