Quick guide
How to use this calculator
- Add every value already known.
- Enter the desired final average and how many values remain.
- Use either the required total or the equal-value plan; different remaining values work if their total matches.
Calculation method
Reverse the arithmetic-mean relationship
The target final total is the target average multiplied by the final count. Subtracting the known sum gives the total still required.
Worked example
Raise three scores to a target
Scores 70, 80, and 75 need two more equal scores to finish at 80.
Required total = 80×5−225 = 175; equal values = 87.5
Supported inputs
Precision and limits
List size
Add 1–100 labelled value rows.
Decimal size
Each value may contain up to 200 digits and 100 decimal places.
Exactness
Exact rational results are never replaced by a rounded decimal; approximations are labelled.
Planning boundary
The calculator does not impose real-world minimum or maximum score limits; compare the required value with the rules of your situation.