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Percentage Calculator
Find a percentage of a number, what percent one number is of another, or the whole from a part.
Factor Calculator
List every factor of a whole number, its factor pairs and its prime factorization.
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How to use this calculator
Enter your values. The result updates as you type; press Calculate to confirm and jump to the result on mobile. Use Share to send the calculator with your result.
What is a factor?
A factor of a number divides it exactly, with no remainder. The factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. Factors come in pairs that multiply to the number: 1 × 24, 2 × 12, 3 × 8, 4 × 6.
How the calculator finds factors
It tests every whole number from 1 up to the square root of your number. Each divisor a also gives its partner n ÷ a. Prime factorization repeatedly divides by the smallest prime that fits.
Factors of common numbers
| Number | Factors |
|---|---|
| 12 | 1, 2, 3, 4, 6, 12 |
| 18 | 1, 2, 3, 6, 9, 18 |
| 24 | 1, 2, 3, 4, 6, 8, 12, 24 |
| 27 | 1, 3, 9, 27 |
| 28 | 1, 2, 4, 7, 14, 28 |
| 30 | 1, 2, 3, 5, 6, 10, 15, 30 |
| 36 | 1, 2, 3, 4, 6, 9, 12, 18, 36 |
| 48 | 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 |
| 60 | 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60 |
| 72 | 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72 |
| 100 | 1, 2, 4, 5, 10, 20, 25, 50, 100 |
Frequently asked questions
What are the factors of 24?
1, 2, 3, 4, 6, 8, 12 and 24.
What are the factors of 27?
1, 3, 9 and 27.
Is 1 a prime number?
No. A prime has exactly two factors (1 and itself); 1 has only one.
About this tool
- Written by
- [Author: to be assigned]
- Reviewed by
- Formula tests passed · human review pending
- Last updated
- 31 Oct 2026
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