IB command term
Calculate in IB exams: what the command term means
By Michael Thompson - Head of Teaching Excellence; 15 years as an IB Coordinator
In IB exams, calculate means you work out a numerical answer and show the relevant stages of your working. The number alone is not the whole response: the formula, the substitution and the intermediate steps belong on the page.
Paraphrased from the command-term definitions in the IB Diploma Programme subject guides (International Baccalaureate Organization).
At a glance
Data, working and diagrams
Answer shape: Visible working, read data or a labelled diagram
What calculate asks you to do
Calculate has two parts. You must reach a numerical answer, and you must show the relevant stages of working that led to it. A bare number answers only half of the question. The examiner needs to see how you got there.
Show the working, not just the number
Write the formula, then the substitution, then the result. Method marks can survive an arithmetic slip, but only if the method is visible on the page. If a wrong final number comes with clear working, the method can still be credited. If it comes with nothing, there is nothing to credit.
Layout, units and precision
Lay the working out vertically, one stage per line, and label intermediate results so each stage can be credited. Units and sensible precision are part of the answer, not decoration. A correct value with a missing or wrong unit is an incomplete answer.
Check the answer before moving on
Before you leave the question, check the magnitude and the sign against the context. Ask whether the result is plausible for the situation described. A quick sanity check can catch a slipped decimal or a sign error that would otherwise cost you the final answer.
Calculate and its neighbouring terms
Calculate is often confused with determine, derive and deduce. They are different command terms and each has its own page. Check which term the question uses, because it tells you what kind of response is expected. Do not treat them as interchangeable.
Where it appears
Economics
When an economics question says calculate, give a numerical answer and the working behind it. Write the formula you use, substitute the values from the data, and state the result with its unit or label.
Economics tutoringPhysics
In physics, calculate means a numerical result with visible working. Quote the relationship, substitute with units, label intermediate values, and give the final answer with a unit and sensible precision.
Physics tutoringChemistry
In chemistry, a calculate question wants the numerical answer and the stages that produced it. Lay the steps out one under another, label each intermediate quantity, and finish with the correct unit.
Chemistry tutoringBusiness Management
In business management, calculate asks for a worked numerical answer. Show the formula, the figures you substituted from the case or data, and the result, so the method can be credited even if a slip occurs.
Business Management tutoringCommon mistakes
- Writing only the final number and leaving out the formula and substitution.
- Leaving out units, or giving a result with unreasonable precision.
- Cramming the working into a messy block so the stages cannot be followed.
- Skipping the sanity check on magnitude and sign against the context.
- Treating calculate as the same as determine, derive or deduce without checking what the question asks.
Frequently asked questions
- What does calculate mean in IB exams?
- It means work out a numerical answer and show the relevant stages of your working. Both the result and the visible method matter.
- Do I lose marks if I only give the final answer?
- You risk it. Calculate requires the working, not just the number. Method marks can only be awarded for steps the examiner can see on the page.
- Are units really part of the answer?
- Yes. Units and sensible precision belong to the answer itself. A correct number without its unit is incomplete.
- How is calculate different from determine, derive and deduce?
- They are separate command terms, each with its own expectations. Read the dedicated pages for each, and always follow the exact term used in the question.
Related command terms
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