Grade Calculator: Weighted Average, Final Exam Score Needed and GPA

Work out your grade, and what you still need to score.

Calculated from standard textbook formulas, with every step shown. The formulas are fixed, so the working does not need checking: what matters is the numbers you type in. Use these calculators only if you are competent to choose the inputs (loads, material strength, dimensions, supports) and check your units and assumptions. For learning and checking your own working: design and sign-off are for a qualified engineer. Drafting Central does not store the numbers you type.

How this calculator works

Choose weighted average, the final exam mark needed, or GPA.

For an average enter each mark with its weight. For the final exam enter your average so far, the weight of the final and your target. For a GPA enter each grade with its credit points.

The calculator gives the result with the working, and the mark needed for each grade band.

Formulas used

  • A = \frac{\sum w_ix_i}{\sum w_i}
  • F = \frac{T - C(1 - w)}{w}
  • GPA = \frac{\sum g_ic_i}{\sum c_i}

Worked example

With the default numbers in the calculator above:

  1. Weighted average of the marks you entered: 82.889 % [78 x 20 + 85 x 30 + 92 x 25 + 70 x 15]
  2. Total weight entered and the marks earned so far out of that weight: 90 % of the subject, giving 74.6 marks so far
  3. Average needed on the remaining 10 percent to reach the target of 80 percent: 54 %

Change the numbers in the calculator to see the full working, every step, for your own case.

A second worked example

A different case, with these numbers: What do you want? The mark needed on the final exam.

  1. Mark needed on the final exam to reach the target: 92 %
  2. The mark needed for the usual grade bands (Australian university pattern): High Distinction (85): not possible; Distinction (75): 79.5 %; Credit (65): 54.5 %; Pass (50): 17 %
  3. Your result if you score the same as your average so far: 72 %
  4. Your result if you score 100 percent, and if you score 0 percent on the final: 83.2 % at best and 43.2 % at worst

Common questions

How do I calculate what I need on the final exam?

Take the target, subtract your average so far times the share of the subject that is not the final, and divide by the weight of the final exam.

What is a weighted average?

An average where each mark counts in proportion to its weight. A mark worth 30 percent counts three times as much as one worth 10 percent.

How is GPA worked out?

Multiply each grade point by the credit points of the subject, add them up and divide by the total credit points.

Related calculators

Got a question about this? Ask an engineering question and get a plain-language answer with references.

Further reading: General arithmetic. Your institution's own rules decide how grades and GPA are calculated.

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