The average, the weighted average and what grade you need to get there. Free, nothing to install, no sign-up.
This calculator does the three grade sums that actually come up: the ordinary average, the weighted average for when each mark counts for a different amount, and the one everybody searches for at the end of term — what you need to score on what is left to reach the average you want. Add your marks with the add button, pick the mode and calculate. It runs inside your browser and downloads as a PDF.
Add all the marks and divide by how many there are. Four marks — 6, 7, 8 and 5 — come to 26, and 26 ÷ 4 = 6.5. But that sum is only right if they ALL count the same. The moment the final exam is worth more than a piece of coursework, the simple average stops telling the truth, and that is where the trouble starts.
Multiply each mark by what it is worth, add those up and divide by the total of the weights. An exam of 8 worth 60% and coursework of 5 worth 40%: 8 × 0.6 = 4.8, 5 × 0.4 = 2, and 4.8 + 2 = 6.8. The simple average would have told you 6.5. Nearly four tenths of difference, and at a grade boundary that decides it.
This is the useful question. If you are carrying a 5 worth 70% and you have one exam left worth 30%, and you want a 6 overall: what you have contributes 5 × 0.7 = 3.5, you are short by 6 − 3.5 = 2.5, and that 2.5 has to come out of the remaining 30%, so 2.5 ÷ 0.3 = 8.33. You need 8.33. The calculator does that sum for you, and if the number comes out above the maximum mark it says so — which is the honest answer even when it is not the welcome one.
Entering the weights inconsistently: if you are told 60% and 40%, use 0.6 and 0.4, or use 60 and 40, but never one of each. And the check that never fails: the average HAS to land between your lowest and your highest mark. If your marks run from 5 to 8 and you get 9, something is entered wrong. If it lands right in the middle when your weights were very different, you are probably in simple mode without noticing.
The simple one only holds if every mark counts equally. As soon as the syllabus says the exam is 60% and the practicals 40%, you have to use the weighted one, or the number you get is not your grade.
Either works, as long as they all match: all percentages (60 and 40) or all decimals (0.6 and 0.4). Mixing them is the commonest slip, and it gives an answer that looks reasonable and is wrong.
No. The sum divides by the total of the weights, so 3, 2 and 1 works fine: they count for a half, a third and a sixth. That is handy when a teacher says "the exam counts double" instead of giving you percentages.
No. Everything happens inside your browser: the marks you type never leave your device and are not stored anywhere. No account, no email address.
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