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GCSE physics equation calculator
Pick a GCSE physics equation, enter your values with their units, and see the working in exam layout: the equation, the rearrangement, the substitution and the answer with units and significant figures.
No equation matches that search.
Motion
Forces
Energy and power
Waves
Electricity
- Q = I tCharge, current and time
- V = I ROhm’s law
- P = V IElectrical power
- P = I2 RElectrical power
- E = Q VEnergy transferred
- Rtotal = R1 + R2Resistors in series
- 1 / Rtotal = 1 / R1 + 1 / R2Resistors in parallel
- Vout = Vin R2 / (R1 + R2)Potential divider
- Vp / Vs = Np / NsTransformer turns ratio
- Vp Ip = Vs IsTransformer power
Thermal physics and gases
Nuclear and particles
Practise with a random question
Press the button for a question with random numbers. Work it out on paper first, then type your answer.
How the calculator works
- Choose an equation from the list above.
- Pick the quantity you want to find. Every other quantity becomes an input.
- Type your values and pick the units they are in. Standard form such as 3e8 or 3 x 10^8 works.
- Read the working underneath. It is set out like a marked answer: equation, rearrangement, substitution, answer.
Common questions
Which equations does this physics calculator cover?
It covers 36 GCSE physics equations, grouped by topic: motion, forces, energy and power, waves, electricity, thermal physics, nuclear physics. Check your exam board’s specification and equation sheet for the equations you must remember and the ones you are given.
Does the calculator show the working?
Yes. For each calculation it writes the equation, the rearrangement, any unit conversions, the substitution, the calculation and the final answer with units and the number of significant figures you choose.
Can I use it in an exam?
No. It is a revision and homework tool. In exams use the calculator your exam board allows. Use this page to check your own working and to practise.
Is it free to use?
Yes. It is free, with no sign-up, no adverts and no personal tracking.
Looking for a physics formula rather than a calculator? See the formula library, or try the other tools.