Combined Group Mean CalculatorFree online math calculator — instant results, no sign-up
Combine two group means using group sizes as weights.
Sign in to save results and favorites.
About the Combined Group Mean Calculator
Combine two group means using group sizes as weights. Uses the stated mathematical model and consistent units. Display is rounded to six decimal places; preserve precision for chained calculations.
- First group mean
- Enter first group mean. Accepted minimum: -1000000000000.0.
- First group size
- Enter first group size. Accepted minimum: 1.
- Second group mean
- Enter second group mean. Accepted minimum: -1000000000000.0.
- Second group size
- Enter second group size. Accepted minimum: 1.
Formula and method
Result = (mean1 * n1 + mean2 * n2) / (n1 + n2)
- mean1First group mean
- n1First group size
- mean2Second group mean
- n2Second group size
Combine two group means using group sizes as weights. Substitute the variables using the units defined above. Uses the stated mathematical model and consistent units. Display is rounded to six decimal places; preserve precision for chained calculations.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- First group mean10
- First group size20
- Second group mean20
- Second group size30
Results
- Result16
How to use the Combined Group Mean Calculator
- 1Enter first group mean.
- 2Check first group size, second group mean, second group size.
- 3Read the numerical result and compare the stated assumptions with your situation.
Reading your result
Combine two group means using group sizes as weights. The displayed quantity is dimensionless. A negative value, when the formula permits one, describes the direction of the difference—not a positive gain.
Limitations
Uses the stated mathematical model and consistent units. Display is rounded to six decimal places; preserve precision for chained calculations. Numeric results are rounded for display; the calculation does not establish that your chosen inputs represent a realistic or permitted scenario.
Common questions
Which units does Combined Group Mean require?+
First group mean: dimensionless number; First group size: dimensionless number; Second group mean: dimensionless number; Second group size: dimensionless number. Do not mix incompatible units.
What assumptions matter for Combined Group Mean?+
Uses the stated mathematical model and consistent units. Display is rounded to six decimal places; preserve precision for chained calculations.
How should I check a Combined Group Mean result?+
Use the formula above with the shown starting inputs and compare the worked example generated from the tool. Check the original measurements and terms before using the figure.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
You might also like
Symmetric Percentage Difference Calculator
Compare two positive values using their mean as denominator.
Midrange Calculator
Find the midpoint between minimum and maximum values.
Relative Frequency Calculator
Compare observed category count with total observations.
Binary Entropy Calculator
Compute Shannon entropy of a binary outcome probability.
Geometric Sequence Term Calculator
Find a specified geometric-sequence term.
Arithmetic Sequence Term Calculator
Find a term from initial value and constant difference.
Results are estimates for informational purposes and are not financial, medical or legal advice.