Ladder Height Calculator

Choosing the Correct Ladder Length

One of the most common ladder selection mistakes is choosing a ladder that is too short. Always check that the ladder length matches your required vertical access height, and remember to allow extra length if you need to step safely onto a landing area.

Standard Leaning Ladder Setup

This guidance applies to conventional leaning ladders (such as push-up multi-section extension ladders) used at a 1-in-4 lean angle, which is approximately 76° from horizontal.

• 1-in-4 rule: position the ladder 1 unit out at the base for every 4 units of vertical height
• Example: for 4m of vertical height, the ladder base should be set 1m away from the wall

Why Ladder Angle Matters

• Too steep: the ladder can move or slip away from the wall
• Too shallow: excessive loading is applied to the stiles
• As the ladder approaches a horizontal position, structural forces increase significantly

Important: never use a standard leaning ladder as a bridge.

When Different Angles Are Acceptable

There are specialist exceptions. For example, our shelving access ladders and industrial loft ladders are designed to work at a reduced angle (around 67°). These models feature deeply ribbed flat treads and are manufactured from stepladder-grade materials specifically for that use case.

Need Advice?

If you are unsure which ladder length or type is right for your application, contact our team via website chat, email, or phone.