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    8461

    AQA GCSE Biology Equation Sheet (8461)

    Every AQA GCSE Biology equation you need — all 9 formulas by topic. AQA gives no equation sheet for Biology, so all of these must be memorised.

    9

    Formulas listed

    9

    You must memorise

    0

    No sheet given

    Cells

    Magnification

    Memorise
    magnification=image sizeactual size\text{magnification} = \dfrac{\text{image size}}{\text{actual size}}

    Real size from image

    Memorise
    actual size=image sizemagnification\text{actual size} = \dfrac{\text{image size}}{\text{magnification}}

    Surface area to volume ratio

    Memorise
    SA:V=surface areavolume\text{SA:V} = \dfrac{\text{surface area}}{\text{volume}}

    Health

    Body Mass Index (BMI)

    Memorise
    BMI=mass (kg)(height in m)2\text{BMI} = \dfrac{\text{mass (kg)}}{(\text{height in m})^2}

    Waist : hip ratio

    Memorise
    ratio=waist circumferencehip circumference\text{ratio} = \dfrac{\text{waist circumference}}{\text{hip circumference}}

    Circulation

    Cardiac output

    Memorise
    cardiac output=stroke volume×heart rate\text{cardiac output} = \text{stroke volume} \times \text{heart rate}

    Transport

    Percentage change in mass (osmosis practical)

    Memorise
    % change=final−initialinitial×100\%\text{ change} = \dfrac{\text{final} - \text{initial}}{\text{initial}} \times 100

    General

    Rate (general)

    Memorise
    rate=changetime\text{rate} = \dfrac{\text{change}}{\text{time}}

    Statistics

    Mean

    Memorise
    mean=sum of valuesnumber of values\text{mean} = \dfrac{\text{sum of values}}{\text{number of values}}
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