To determine the correct size step ladder you need, you should consider the maximum height you plan to reach while standing on the ladder. According to Sherwin-Williams, you can use the following guide, which assumes you can comfortably reach about 12 inches vertically from the top safe step.
Choosing the Right Step Ladder Size
Selecting the appropriate ladder size is crucial for safety and efficiency when working at height. The size of the step ladder is measured by its overall length when closed, but the usable height is lower, as you should not stand on the very top cap or the step below it.
Ladder Size Guide Based on Reach Height
The following table, based on information from Sherwin-Williams, provides a simple correlation between the maximum height you need to reach and the recommended step ladder size to purchase.
| Max. Height You Want to Reach | Buy This Size Ladder (assumes vertical 12-inch reach) |
|---|---|
| 8 feet | 4-foot |
| 9 feet | 5-foot |
| 10 feet | 6-foot |
| 11 feet | 7-foot |
Source: Choosing a Ladder - Sherwin-Williams
This guide helps ensure you have enough height to comfortably and safely perform your task without overreaching. Always follow manufacturer's instructions and safety guidelines when using any ladder.
