Education & Study

Convert CGPA or GPA to percentage on 4, 5 or 10-point scales, including HEC and CBSE formulas.

Add, subtract, multiply, divide and find powers and roots of complex numbers, with polar form, modulus and argument.

Find the definite integral (area under a curve) of any function between two limits using Simpson’s rule, with a graph of the shaded area.

Find the derivative of any function – first, second and third derivatives with simplification – and evaluate the slope at a point. Supports trig, log, exponential and powers.

Solve any equation in x – linear, quadratic, cubic, trig or exponential – and find all real roots in a range, with a check for each answer.

Calculate your semester GPA on a 4.0 scale from course grades and credit hours.

Plot graphs of functions online – y = x², sin(x), 2x+3, log(x) and more. Multiple functions in colours, pinch/drag to zoom and pan, trace points, find roots. Free graphing calculator for students.

Find the line of best fit (y = mx + b), correlation coefficient r, R² and predictions from x and y data, with a scatter plot.

Convert obtained marks into percentage and grade for exams, matric, inter and university results.

Find the mean (average), median, mode and range of any list of numbers – with sorted data, quartiles, variance and step-by-step working for homework.

Calculate the molar mass (molecular weight) of any chemical formula – H2O, C6H12O6, Ca(OH)2, CuSO4·5H2O – with element breakdown and mass percent composition.

Find probabilities under the normal (bell) curve from mean and standard deviation – P(X < x), P(X > x), between two values – plus z-scores and inverse normal.

Find all real and complex roots of a polynomial up to degree 8 from its coefficients – quadratic, cubic, quartic and higher.

Free online scientific calculator with trig, logs, powers, roots, factorial and history.

Create a personalised exam study timetable – add subjects, chapters and difficulty, set your exam date and daily hours, and get a day-by-day revision plan with review days. Tick off progress and print.

Help kids learn to read an analogue clock – interactive clock with draggable hands, quiz mode (o’clock, half past, quarter, 5 minutes) and printable clock worksheets.

Practise multiplication tables 1–20 with a fun timed quiz – choose tables, number of questions and speed mode. Big number pad for phones and a report of mistakes.

Find vector addition, subtraction, dot product, cross product, magnitude, unit vector and the angle between two vectors in 2D or 3D.

Calculate acceleration from speed change and time, or from force and mass (F = ma) – with units in m/s², km/h and g-force.

Find the nth term, the sum of n terms and list the terms of an arithmetic progression (AP) from the first term and common difference.

Calculate your attendance percentage and how many classes you can miss or must attend to reach 75%.

Find exact and cumulative binomial probabilities P(X = k), P(X ≤ k), P(X ≥ k) with mean, variance and a probability chart.

Calculate the area, circumference, diameter and radius of a circle from any one value – plus arc length and sector area.

Generate APA, MLA, Harvard and Chicago citations for websites, books and journal articles.

Calculate the confidence interval for a mean (z or t) or a proportion at 90%, 95% or 99% confidence, with margin of error.

Convert decimals to fractions, fractions to decimals and percentages – with simplified fractions, mixed numbers and repeating decimals.

Calculate density, mass or volume with ρ = m / V – with common unit conversions and a table of material densities.

Solve dilution problems with C1V1 = C2V2 – find the stock volume, final concentration or final volume, and how much solvent to add. Works with %, M, mM and mg/mL.

Find the empirical and molecular formula from percent composition or grams of each element, step by step.

Calculate powers and exponents – x to the power of n, negative and fractional exponents – with the expanded form and scientific notation.

Find all factors of a number, factor pairs, prime factorization and the number of divisors – fast and with clear explanations.

Find out what score you need on your final exam to get the overall grade you want.

Make your own flashcards online and study them – flip cards, shuffle, mark what you know and review the rest. Saved in your browser.

Calculate force, mass or acceleration using Newton’s second law F = ma – plus weight (W = mg) – with unit conversions for N, kN, kgf and lbf.

Add, subtract, multiply and divide fractions and mixed numbers with simplified answers.

Calculate free fall time, impact velocity and height for an object dropped from rest – on Earth, Moon, Mars or Jupiter – ignoring air resistance.

Find the nth term, the sum of n terms and the sum to infinity of a geometric progression (GP) from the first term and common ratio.

Calculate the gravitational force between two masses with Newton’s law F = Gm₁m₂/r², or solve for mass or distance.

Calculate remaining quantity, half-life, elapsed time or initial amount for radioactive decay and drug elimination using N = N₀(½)^(t/T). Includes a decay chart.

Solve the ideal gas equation PV = nRT for pressure, volume, moles or temperature – with unit conversions for atm, kPa, mmHg, bar, L, m³, °C and K.

Interactive periodic table with all 118 elements – atomic number, mass, group, period, category and electron configuration. Search and tap any element.

Calculate kinetic energy from mass and velocity – or find mass or speed from energy – using KE = ½mv². Unit options for kg, g, m/s, km/h and J, kJ.

Find the LCM and GCD (HCF) of two or more numbers with prime factorization.

Calculate logarithms in any base – log10, natural log (ln), log2 and custom bases – plus antilog, with clear explanations.

Divide numbers with long division and see every step – quotient, remainder and decimal answer. Perfect for kids and homework.

Multiply big numbers with the long multiplication method, showing every partial product and carry, step by step – great for kids and teachers.

Practice mental math online – addition, subtraction, multiplication tables and division – with 3 levels, a 60-second challenge and instant scores. Great for kids.

Matrix calculator: add, subtract, multiply, transpose, determinant and inverse for 2×2 to 5×5 matrices with fractions.

Calculate molarity, moles, grams of solute or solution volume, using molar mass – for preparing lab solutions.

Calculate momentum, mass or velocity using p = mv, plus impulse and kinetic energy – with unit conversions.

Generate printable multiplication tables (times tables) from 1 to 100 – single table, range or practice quiz.

Calculate voltage, current, resistance and power with Ohm’s law – enter any two values and get the other two with formulas.

Calculate percent error, absolute error and relative error between measured and true (accepted) values – for science and lab reports.

Calculate permutations (nPr) and combinations (nCr) with and without repetition – with formulas, factorials and examples.

Check if a number is prime, see its prime factors and find the next and previous prime.

Calculate probability of single and multiple events – A and B, A or B, not A, conditional probability and odds – with clear explanations.

Calculate projectile range, maximum height, flight time and impact speed from launch speed, angle and height – with an animated trajectory graph.

Make a Punnett square for monohybrid or dihybrid crosses (Aa × Aa, AaBb × AaBb) and get genotype and phenotype ratios.

Find the missing side of a right triangle with the Pythagorean theorem (a² + b² = c²) – with steps, area and angles.

Solve quadratic equations ax² + bx + c = 0 with real and complex roots, discriminant and vertex.

Test your reading speed in words per minute (WPM) with a short passage and comprehension questions. Compare with average readers and get tips to read faster.

Find a resistor’s value from its colour bands – 4, 5 or 6 bands with tolerance and temperature coefficient – or get the colour bands for any resistance value. Visual resistor preview.

Round numbers to the nearest whole number, tenth, hundredth, ten, hundred or any decimal place – round up, down or half-even.

Find how many people you need to survey for a chosen confidence level and margin of error, with finite population correction.

Convert numbers to and from scientific notation and E notation – with engineering notation, significant figures and word names.

Calculate total resistance of resistors in series or parallel (or capacitors and inductors) – add any number of values with k/M prefixes and see the working.

Count significant figures in any number and round to a chosen number of sig figs – with the rules explained, scientific notation and decimal places.

Find the slope, line equation (y = mx + b), distance, midpoint and angle between two points – with step-by-step working.

Calculate heat energy, mass, specific heat capacity or temperature change using Q = mcΔT, with common material values.

Practise spelling with audio – the tool reads each word aloud and you type it. Use your own weekly spelling list or ready word lists by grade. Shows mistakes letter by letter.

Find the square root, cube root or any nth root of a number – with simplified radical form, perfect square check and steps.

Calculate standard deviation, variance, mean and standard error for sample or population data.

Solve systems of linear equations with 2 or 3 unknowns (x, y, z) – using Cramer’s rule, with determinant and step-by-step check.

Solve the lens and mirror equation 1/f = 1/u + 1/v for focal length, object distance or image distance, with magnification and image type.

Solve any triangle from three sides or two sides and an angle – get all angles, area, perimeter, type of triangle and heights.

Calculate sin, cos, tan, cosec, sec and cot for any angle in degrees or radians, plus inverse functions (arcsin, arccos, arctan) with exact values for common angles.

Calculate the volume and surface area of a cube, box, cylinder, sphere, cone, pyramid and hemisphere – in litres, gallons and cubic units.

Convert between wavelength, frequency and photon energy for light, radio and sound waves using v = fλ and E = hf. Shows the part of the electromagnetic spectrum.

Find out how much you would weigh on the Moon, Mars, Jupiter and every planet in the solar system – plus how high you could jump. A fun science tool for kids.

Calculate a weighted average (weighted mean) – for grades with different weightages, portfolio returns or survey scores. Add rows of value and weight; see the working.

Calculate work done (W = F × d × cosθ) and power (P = W ÷ t) – in joules, watts, kilowatts and horsepower – for physics homework and real-life problems.

Test your geography with a world capitals quiz – 120+ countries, multiple choice, country-to-capital or capital-to-country, by region, with score and review.

Calculate the z-score of a value from the mean and standard deviation, and find the percentile and probability from the normal distribution.

Calculate pH, pOH, hydrogen ion [H+] and hydroxide [OH-] concentration – from any one value, or from the molarity of a strong acid or base. Shows acid/base scale.