A Level Physics Calculator: What to Use & Why

For A level physics, the calculator you need is a scientific calculator—one that handles trigonometric functions, logarithms, exponentials, and standard form. You don’t need a graphing calculator or a programmable one; the exam boards specify that calculators must be non-programmable and cannot have symbolic algebra or calculus capabilities. This article explains what to look for, how to use it effectively in exams, and common pitfalls to avoid.

Formula

The calculator above computes average speed from distance and time. The formula is:

v = d / t

• v = average speed (m/s)
• d = distance travelled (m)
• t = time taken (s)

The second output converts the result to km/h by dividing distance by 1000 (to get km) and time by 3600 (to get hours).

Worked Example

Using the default values: d = 100 m, t = 2.5 s.

1. Substitute into v = d / t: v = 100 / 2.5
2. Calculate: v = 40 m/s
3. Convert to km/h: (100 / 1000) / (2.5 / 3600) = 0.1 / 0.0006944 = 144 km/h

The calculator shows 40.00 m/s and 144.00 km/h, matching the manual calculation.

What the Exam Boards Allow

Most A level physics exam boards (including AQA, OCR, Edexcel, and CIE) follow the same rule: calculators must be non-programmable. That means no graphing calculators with CAS (computer algebra system), no calculators with text storage, and no calculators that can connect to other devices. In practice, a standard scientific calculator like the Casio fx-83GT X or fx-991EX (non-programmable) is fine. Check the specific board’s regulations, but the general rule is consistent.

Key Functions You Need

Your calculator should have these functions, which appear constantly in A level physics:

• Trigonometric functions (sin, cos, tan) and their inverses – for resolving vectors and waves
• Exponentials and logarithms (e^x, ln, log) – for radioactive decay and capacitor discharge
• Powers and roots (x², x³, √, x^y) – for inverse-square laws and Kepler’s third law
• Standard form (×10^x) – for very large and very small quantities like the Planck constant (6.63×10^-34 J s)
• Memory functions – to store intermediate results

How to Choose a Calculator

When picking a calculator, consider these factors:

• Non-programmable – this is non-negotiable for exams.
• Solar or battery – both work, but a solar one can run out of light in an exam hall; a battery one is more reliable.
• Display – a natural display (shows fractions and roots as they appear in textbooks) reduces entry errors.
• Price – a basic scientific calculator costs around £10-15; there’s no need to spend £50+ on a graphing one.
• Familiarity – use the same calculator for all your practice and exams; don’t switch models right before the test.

Common Mistakes and How to Avoid Them

Even with the right calculator, students make errors. Here are the most common:

• Degrees vs radians – Physics often uses radians, especially in circular motion and oscillations. Always check the mode. A common error: forgetting to switch back to degrees for a question about angles in a triangle.
• Standard form entry – Use the ×10^x button, not the letter x. Typing 6.63×10^-34 as 6.63×10^-34 can cause order-of-operations errors.
• Negative numbers – Use the (-) key, not the minus key, for negative values. This prevents errors in exponential calculations.
• Rounding too early – Keep intermediate values in the calculator’s memory; round only at the final answer.

Limits of a Calculator in Physics

A calculator is a tool, not a substitute for understanding. In A level physics, you must also:

• Estimate answers – Before pressing equals, estimate the magnitude. If you’re calculating the speed of a car and get 10⁸ m/s, you know it’s wrong.
• Use significant figures – Your final answer should match the least precise data, typically 2 or 3 significant figures.
• Check units – Always convert to SI units before calculating. If you input distance in km and time in minutes, the result will be meaningless.

Frequently Asked Questions

Can I use a graphing calculator in A level physics?

No, most exam boards prohibit graphing calculators because they can store text and have advanced functions. Stick to a non-programmable scientific calculator. If you’re unsure, check your exam board’s official calculator policy.

Do I need a calculator with a natural display?

It helps, but it’s not essential. A natural display shows fractions and roots as they appear in textbooks, reducing input errors. Many students find it easier to check their entries, but you can do well with a standard display if you’re careful.

What does “non-programmable” mean exactly?

It means the calculator cannot store user-written programs or text. It can still have standard functions and memory for numbers. Some calculators have a “lock” mode that disables programming for exams; if yours does, use it.

How do I switch between degrees and radians?

Most scientific calculators have a MODE button. Press it and select DEG or RAD. On some models, you press SHIFT then MODE to access the setup menu. Always check the mode before starting a calculation involving trig functions.

Why does my calculator give a different answer for sin(30) than my friend’s?

Almost certainly because one is in degrees and the other in radians. sin(30°) = 0.5, but sin(30 rad) ≈ -0.988. Always ensure your calculator is in the correct mode for the problem.

Is it worth buying a more expensive calculator for A level?

Not usually. A mid-range scientific calculator (around £15-20) has everything you need. Expensive graphing calculators are unnecessary and may even be disallowed. Spend the extra money on a good revision guide instead.

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in t | Time | s | 2.5 | 0
in d | Distance | m | 100 | 0
out v | Average speed | m/s | d / t | 2
out v_kmh | Speed in km/h | km/h | (d / 1000) / (t / 3600) | 2