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Average Calculator – Average of Two Numbers
Quick answer
If first number is 12 and second number is 18, the average is 15.
Average = (a + b) ÷ 2.
Enter your values
Average
15
The arithmetic average — every value added together, divided by how many there are.
You enter First number 12, Second number 18. You get Average 15.
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About the Average Calculator – Average of Two Numbers
The average of two numbers is the value exactly halfway between them. Add the numbers and divide by 2. It is handy for midpoints, finding a typical value and splitting a difference.
The average of 12 and 18 is 15.
Average
Average = (a + b) ÷ 2
Things to keep in mind
- For more than two numbers, use the Mean calculator.
- The average always lies between the two numbers.
- If both numbers are equal, the average equals that number.
See how the result changes
Each table re-runs this calculator with one value changed and everything else left as it is.
Average by first number
If first number goes from 12 to 18, average changes from 15 to 18 (+20%).
| First number | Average |
|---|---|
| 6 | 12 |
| 9 | 13.5 |
| 12start | 15 |
| 18 | 18 |
| 24 | 21 |
Average by second number
If second number goes from 18 to 27, average changes from 15 to 19.5 (+30%).
| Second number | Average |
|---|---|
| 9 | 10.5 |
| 13.5 | 12.75 |
| 18start | 15 |
| 27 | 19.5 |
| 36 | 24 |
MATH GUIDE
A quick guide to Average of Two Numbers
Use it to get an accurate average in seconds — free, with no sign-up.
Instant results
See your average the moment you enter your numbers.
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Every calculator here is free to use, with no account required.
Accurate & transparent
The same standard formula runs on our server for every calculation.
How to Use the Average of Two Numbers Calculator
1
Enter First number
Provide your first number.
2
Enter Second number
Provide your second number.
3
View Your Results
Get your average instantly, calculated on our server.
What is Average of Two Numbers?
This math tool works out your average instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your average before you decide.”
What Affects Your Average
Your average depends on the values below.
First number
Changing your first number changes your average.
Second number
Changing your second number changes your average.
Example Result
Here's what you can expect from an average of two numbers calculation:
- First number
- 12
- Second number
- 18
- Average
- 15
Frequently Asked Questions
- How does first number affect average?
- If first number goes from 12 to 18, average changes from 15 to 18 (+20%).
- How does second number affect average?
- If second number goes from 18 to 27, average changes from 15 to 19.5 (+30%).
- How to calculate average of two numbers?
- Fill in first number and second number in the Average Calculator – Average of Two Numbers above and your average is calculated instantly. Change any value to see how the result responds.
- What does an example average of two numbers calculation look like?
- If first number is 12 and second number is 18, the average is 15.
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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