How to use this min and max average calculator
Find the midpoint between a minimum and maximum. This is the arithmetic average of the two endpoints, sometimes called the midrange. It does not recover the mean of an unknown dataset, because values between those endpoints may be distributed unevenly.
- Enter the minimum values in the labeled fields, using consistent units.
- Load the example to inspect the expected format, then replace it with your own values.
- Select Calculate and check the result alongside its working. Reset starts a fresh calculation.
Min and Max Average formula
Endpoint midpoint = (minimum + maximum) ÷ 2
The midpoint describes the center of the interval, not the center of the observations. It equals the dataset mean in some symmetric datasets, but symmetry cannot be inferred just from the endpoints.
Follow the numbers
For minimum 10 and maximum 20, the midpoint is 15. A dataset of 10, 10, 20 instead has mean 13.333333.
Load the example above to inspect the entries, then change one value and calculate again. The result follows your selected method. Display rounding changes how the answer is shown; it does not change the underlying observations or weights.
What to check before using the result
The true dataset mean is unknown without the other observations. Minimum must not exceed maximum.
Keep enough precision in the source values for your task. A result calculated from rounded summaries can only be as precise as those summaries. If a number was mistyped or an observation is missing, correct the inputs and calculate again before copying or exporting the answer.
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Common mistakes to avoid
- Confusing a blank with zero. A real zero is an observation. Missing information is not automatically zero.
- Mixing incompatible scales. Use consistent units, or normalize values before combining them.
- Rounding too early. Keep the original values and round at the result stage.
- Using the wrong weighting. The true dataset mean is unknown without the other observations. Minimum must not exceed maximum.
Frequently asked questions
What formula does this calculator use?
Endpoint midpoint = (minimum + maximum) ÷ 2. For minimum 10 and maximum 20, the midpoint is 15. A dataset of 10, 10, 20 instead has mean 13.333333.
What should I check about the method?
The true dataset mean is unknown without the other observations. Minimum must not exceed maximum.
How many entries can I use?
This tool takes exactly 2 numeric values. Numbers must be finite and no greater than 1 trillion in magnitude. Group and old-count inputs have additional whole-number requirements.
Are the displayed decimals exact?
The calculation uses standard floating-point numbers and compensated addition. Results are rounded only for display. Very small values use scientific notation so they do not silently appear as zero. Select the display precision you need, while respecting the accuracy of your original data.
Are my entries saved or sent anywhere?
The calculator performs its arithmetic in your browser. It does not automatically store entries or send them to a server. Copy, print, and CSV actions happen only when you choose them.
Read our calculation methodology for supported precision, validation, and assumptions.