Convert marks to percentage

Divide the earned marks by the available marks and multiply by 100. If you earn 72 out of 90, your percentage is 80%. For a reliable marks to percentage result, check the total possible marks before entering the numbers.

72 ÷ 90 × 100 = 80%

Combine assessments with different totals

Suppose one test is 18 out of 20 and another is 60 out of 100. Add the earned marks to get 78 and the available marks to get 120. The combined points percentage is 65%.

Averaging 90% and 60% gives 75%, which assigns equal weight to the tests. That may be correct only if the course explicitly weights them equally. It is not the same as combining all available points.

Use assigned course weights

If coursework is worth 40% of the final grade and an exam is worth 60%, multiply each percentage score by its weight. Coursework of 85% and an exam of 70% yield 85 × 0.40 + 70 × 0.60 = 76%.

Weighted result = Σ(score × weight)

Missing assessments

A result calculated only from completed work is not necessarily the final course percentage. Decide whether uncompleted assessments count as zero, are excluded temporarily or have a separate policy. The calculator cannot infer that rule.

A percentage is not a GPA conversion

Schools use different grade boundaries and conversion scales. Do not apply an arbitrary percentage-to-GPA formula and describe it as universal. Use the grading policy for your institution or course.

Put the method into practice

Choose the percentage calculator for parts and wholes, or use the percentage change calculator for movement from an original value. For a sale price, the discount calculator and reverse percentage calculator answer two different questions.

Questions to check before calculating

Which number is the reference?

Identify the whole or original amount before calculating. If neither value is the natural reference, consider whether a mean-based percentage difference fits your question.

Should I round intermediate values?

For a mathematical result, keep intermediate precision and round the final display. Actual transaction rules may require a particular rounding policy.

Can I use this as an official grade or financial determination?

These guides explain arithmetic. Institutional grading rules, financial policies and legal requirements must be checked separately.

Take the formula with you

Write the question in words, label the known values and choose the denominator deliberately. Check the answer with an estimate or by reversing the calculation. A short explanation alongside the number makes the result easier to understand and less likely to be misused.