How to use this grade average calculator
Average assignment grades with explicit weights, or compare earned and possible points. Enter numerical percentages for weighted grading and use equal weights when assignments count equally. The calculator shows the method you selected; it does not assume a letter-grade scale or school policy.
- Enter the assignment percentage values in the labeled fields, using consistent units.
- Choose the input method that matches your records. Switching methods loads a labeled example so you can see the required structure.
- Select Calculate and check the result alongside its working. Reset starts a fresh calculation.
Grade Average formula
Grade average = Σ(percentage × weight) ÷ Σweights
A category percentage is already a summary. Check whether a gradebook weights categories, individual assignments, or all available points before entering the data. These arrangements can produce different final grades even from the same scores.
Follow the numbers
An assignment at 80% worth 40 weight units and one at 90% worth 60 produce a grade average of 86%.
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
Numeric grades only. Extra-credit scores above the possible total are not supported in points mode. Your school’s official result may apply additional rules.
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.
Choose a related calculator
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. Numeric grades only. Extra-credit scores above the possible total are not supported in points mode. Your school’s official result may apply additional rules.
Frequently asked questions
What formula does this calculator use?
Grade average = Σ(percentage × weight) ÷ Σweights. An assignment at 80% worth 40 weight units and one at 90% worth 60 produce a grade average of 86%.
What should I check about the method?
Numeric grades only. Extra-credit scores above the possible total are not supported in points mode. Your school’s official result may apply additional rules.
How many entries can I use?
Paste up to 10,000 values, or use up to 100 individual rows when the chosen input method supports them. 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.