Semester average calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
average = t₁ × w + t₂ × (1 − w)
Where this usually goes wrong
Weight is the first term’s share as a decimal: two equal terms is 0.5. The second term takes whatever is left.
Worked example
78% and 88% weighted 40/60 averages to 84%.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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