Average Inputs
Choose an average type and enter the values you want to compare.
Average Calculator
Find simple, weighted, and combined averages for a set of numbers
How It Works
Use the simple mean for equally important values, the weighted average when values have different importance, or the combined average when you are merging existing groups.
All calculations run in your browser and show the count, total, and resulting average so the result is easy to audit.
- Simple average = total of values divided by the number of values.
- Weighted average = sum of value x weight divided by total weight.
- Combined average = combined total divided by combined count.
- Blank values are ignored when entering a list of numbers.
Formulas
Simple mean = sum of values / number of values
Weighted mean = sum(value x weight) / sum(weights)
Combined mean = (average 1 x count 1 + average 2 x count 2) / (count 1 + count 2)
Daily numbers
12, 18, 20, 25
18.75 average
The simple mean gives every value equal weight.
Course grade
90 at 60% and 80 at 40%
86 weighted average
Weights let larger assignments influence the result more.
Merge groups
82 average across 20 items and 90 across 10 items
84.67 combined average
A combined average must use group counts, not just the two averages.
What is the difference between an average and a mean?
In everyday use, average usually means the arithmetic mean: add the values and divide by how many values there are.
When should I use a weighted average?
Use it when some values count more than others, such as assignment grades, survey groups, or investment allocations.
Can I combine two existing averages?
Yes, but you also need the count behind each average. The combined mode uses both counts.
What happens if every field is blank?
The calculator shows a friendly input message instead of treating missing values as a valid average.