Cornerstone
The cornerstone is simply the first letter of your first name, along with the number it carries in the Pythagorean chart. It describes how you tend to approach new situations and fresh starts. It works alongside the capstone, which looks at the last letter instead.
How it's calculated
- Take the first letter of your first name.
- Look up its number using the Pythagorean chart.
Example First name John: the first letter is J, which carries the value 1. The cornerstone is J, value 1.
Related terms
Common questions
- Do I reduce the cornerstone to a single digit?
- There is nothing to reduce. It is always a single letter with a value from 1 to 9, since the Pythagorean chart never assigns more than one digit.
- How is the cornerstone different from the capstone?
- The cornerstone is the first letter of your first name; the capstone is the last letter. One describes openings, the other describes endings.
- Is the cornerstone a core chart number?
- No. It is a minor detail that adds nuance about how you begin things, rather than a core number like the life path or destiny number.
Last reviewed: August 12, 2026