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    The student toolkit that thinks alongside you.

    23+ interactive calculators and a real-time graphing tool for maths, physics, chemistry, biology, economics and finance. Built by tutors. Tuned to IGCSE, A-Level and IB syllabi.

    23+
    Calculators
    6
    Subjects
    Real-time
    Graphing
    100%
    Free, no signup
    Featured tool

    Graphing calculator

    Graphing calculator

    Plot multiple functions. Drag to pan, use the buttons to zoom.

    y =
    y =
    Supported: + - * / ^, sin, cos, tan, log, ln, sqrt, abs, exp, pi, e

    Every tool, one place

    23 tools · click any card to start calculating

    Scientific calculator

    Evaluate expressions with sin, cos, log, sqrt, π, e, ^

    Result
    —

    Quadratic equation

    ax² + bx + c = 0

    x₁
    -
    x₂
    -

    Linear equation

    ax + b = 0 → x = −b / a

    x
    -

    Trigonometry

    sin, cos, tan of any angle

    sin
    -
    cos
    -
    tan
    -

    Percentage calculator

    What % is A of B? And A% of B.

    A is __% of B
    - %
    A% of B
    -

    Standard deviation

    Sample mean and standard deviation

    n
    -
    Mean
    -
    σ (sample)
    -

    Permutations & combinations

    nPr and nCr

    nPr
    -
    nCr
    -

    Molarity calculator

    Concentration of a solution in mol / L

    Molarity
    - mol/L

    pH calculator

    From hydrogen ion concentration [H⁺]

    pH
    -

    Dilution (C₁V₁ = C₂V₂)

    Find the final volume after dilution

    V₂ required
    - mL

    Molar mass

    Molecular weight from chemical formula

    Molar mass
    - g/mol

    Population growth

    Exponential model: N = N₀ · e^(rt)

    Final population
    -

    Enzyme rate (Michaelis–Menten)

    v = Vmax·[S] / (Km + [S])

    Reaction rate v
    -

    Genetics (Punnett)

    Probability of offspring genotypes

    AA25%
    Aa50%
    aa25%

    BMI calculator

    Body Mass Index = kg / m²

    BMI
    -

    Ohm's law

    V = IR · P = VI

    Resistance
    - Ω
    Power
    - W

    Kinetic energy

    KE = ½ m v²

    Kinetic energy
    - J

    Projectile motion

    Range, flight time, peak height (g = 9.81)

    Range
    - m
    Flight time
    - s
    Peak height
    - m

    Price elasticity (midpoint)

    PED = %ΔQ / %ΔP

    PED
    -

    Cost & revenue

    TR = P × Q · π = TR − TC

    Revenue
    -
    Profit
    -

    GDP estimator

    GDP = C + I + G + (X − M)

    GDP
    -

    Compound interest

    A = P(1 + r/n)^(nt)

    Future value
    -
    Interest earned
    -

    Unit converter

    Length & mass conversions

    Result
    3.28084 ft

    Help & FAQ

    Questions students ask about our tools

    Are these calculators free for students?+

    Yes — every tool on this page is 100% free, runs in your browser, requires no signup, and works on mobile, tablet and desktop.

    Which exam boards do these tools cover?+

    The calculators are designed for IGCSE, O-Level, A-Level, IB, AP and undergraduate science, maths and economics. They match the formulas in those curricula.

    Can I use the graphing calculator for exams or homework?+

    Yes. The graphing calculator plots any function in real time, supports zoom, pan and trace, and is great for visualising derivatives, transformations and intersections.

    Do you store my inputs or results?+

    No. All calculations happen locally in your browser. Nothing you type is sent to a server.

    Where can I get help understanding a topic?+

    Book a free trial lesson with one of our specialist tutors — they walk you through the concept behind the number.

    Need more than a number?

    A calculator solves the problem. A tutor solves the gap.

    Book a free 1-to-1 trial with an expert tutor and master the concept behind the answer.

    Book a free trialBrowse courses

    No card required · 30-minute diagnostic · Written learning plan