Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Ideal right-triangle geometry only. It does not approve a ladder placement or account for required extension above a landing.
Example Calculation
- Ladder length: 5 m
- Foot distance from wall: 3 m
A 5 m ladder 3 m from the wall reaches 4 m.
Frequently asked questions
How do I use this calculator?
Enter ladder length, foot distance from wall. The result updates automatically. Use Reset to restore the example values.
What method does it use?
height=√(length²−distance²); angle=acos(distance/length).. Ideal right-triangle geometry only. It does not approve a ladder placement or account for required extension above a landing.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.