Which Calculator Is Allowed in GCSE Maths

The rule is a list of things a calculator must not do

JCQ does not publish a list of approved calculators, and this is the source of most of the confusion. There is no stamp of approval to look for on a box. Instead the regulations define a calculator as an electronic device whose primary purpose is carrying out mathematical calculations — which is why a phone is not one — and then set out the capabilities that disqualify it.

JCQ is explicit that no approved or banned model list exists, because the market changes faster than any list could. That puts the check on the buyer: read the disqualifying capabilities below against what the machine can actually do.

• It must not do symbolic algebra manipulation
• It must not do symbolic differentiation or integration — numerical versions of both are allowed
• It must not communicate with another machine or with the internet
• It must not hold retrievable information: databanks, dictionaries, mathematical formulae or text
• It must be desk-sized, quiet, and battery or solar powered
• Any lid, case or cover with printed instructions or formulae must be removed

What that rules out in practice

The line that matters is the symbolic one. A calculator that returns 2x + 3 when you ask it to differentiate x² + 3x is doing symbolic calculus and is not permitted. A calculator that returns the value of a gradient at x = 2 is doing it numerically and is permitted. The same distinction applies to algebra: solving an equation numerically is fine, rearranging it symbolically is not.

That rules out computer algebra system models — the ones sold for A level and beyond — and it rules out phones, tablets, smart watches and anything with a keyboard that stores text. Most standard school scientific calculators sit comfortably inside every one of these rules and always have.

Exam mode, and who is responsible

Some graphic and advanced scientific calculators have an exam mode that locks down the prohibited functions. JCQ accepts this, provided the mode genuinely removes the banned capabilities and stays active for the whole examination. Centres are entitled to require that it be activated before the paper starts and to check it.

Responsibility for the calculator sits with the candidate. If a model turns out to break a rule, that is the candidate's problem on the morning, not the invigilator's — which is a strong argument for taking the same ordinary scientific calculator into the exam that has been used all year rather than borrowing something unfamiliar the week before.

The advice we actually give students

Buy an ordinary school scientific calculator in Year 9 and use that one model for two years. Fluency with a specific keypad is worth marks: knowing where the fraction key, the table function and the previous-answer key sit saves seconds on every question, and seconds compound across an 80-mark paper.

Then check three things before the series. That the memory is clear. That the cover carries no printed formulae. And that the batteries are new — a fading solar-and-battery model in a dim hall is a genuinely common way to lose an hour of a calculator paper.

A spare calculator of the same model, left in the bag, removes the last of the risk. Centres are not obliged to lend one, and a candidate improvising on an unfamiliar keypad for ninety minutes loses more marks to the machine than to the mathematics.