Calculations
Cross out every consonant in your name and you're left with something that looks less like a name and more like a chant.
That leftover string of vowels is the entire raw material for the soul urge number — everything else about the calculation is just arithmetic from there.
Quick answer
To calculate a soul urge number, write out your full birth name, identify every vowel (A, E, I, O, U, and Y in some conventions), convert each to a number using a Pythagorean letter chart, sum the results, and reduce to a single digit — preserving 11, 22, or 33 if your method treats them as master numbers.
This walkthrough shows one common convention. It does not establish that the resulting number reveals anything true about a person's desires.
Overview
Arithmetic can be checked
The soul urge number leans on the same nine-column Pythagorean letter chart used for the expression and personality numbers — A through I map to 1 through 9, then the sequence repeats. The only thing that changes is which letters from the name actually get used.
Below is one transparent worked example, using only the vowels of a sample name, so the arithmetic is visible before any interpretation begins.
Write out the full birth name exactly as it appears on the birth record — first, middle, and last.
Identify the vowels: A, E, I, O, U are always counted; Y is counted only when it makes a vowel sound and no other vowel does the job in that syllable (so "Bryan" counts the Y, "Yolanda" usually doesn't).
Convert each vowel to a number using the chart where A=1, E=5, I=9, O=6, U=3, and Y=7 when applicable, then sum every value.
Reduce the total to a single digit, unless the sum lands on 11, 22, or 33 and your convention preserves master numbers.
Sum the numeric values of every vowel in the full birth name, then reduce to a single digit, preserving 11, 22, and 33.
Name: MARIA ELENA SOTO
Input: MARIA ELENA SOTO
1. Isolate the vowels
A, I, A, E, E, A, O = 0
Reading through MARIA ELENA SOTO, the vowels are A-I-A (Maria), E-E-A (Elena), and O (Soto).
2. Convert and sum
1 + 9 + 1 + 5 + 5 + 1 + 6 = 28
Using A=1, I=9, E=5, O=6, each vowel is converted and added together.
3. Reduce the total
2 + 8 = 10
28 reduces to 10, which reduces again.
4. Final reduction
1 + 0 = 1
10 is not a preserved master number, so it reduces to 1.
Result: 1
A school that counts Y as a vowel in other names, or reduces each name part separately before summing, could arrive at a different total — always state the method used.
Verdict
The soul urge number uses only the vowels of a full birth name.
Practical Use
The letter chart is the same one used for other name-based numbers.
Important Limit
Name your Y-handling convention — it's the most common source of disagreement between calculators.