Free tools
Free tools for maths, puzzles and cubing.
31 free tools: maths calculators and games, a Rubik's Cube timer, scramble generator and virtual cube, loan and interest calculators, and study planners. No sign-up, and nothing you type leaves your device.
Maths, puzzles & learning
Maths practice & games
Mental maths practice
Quick-fire sums for kids and adults: add, subtract, multiply, divide, squares and percentages at four levels, with a 60-second sprint.
Use the tool โTimes tables trainer
See any times table up to ร30, copy it, or hide the answers and test yourself. Includes pattern tips for the 5s, 9s and 11s.
Use the tool โ24 game & solver
Make 24 from four numbers using + โ ร รท. A classic puzzle for kids, parents and maths fans, with hints and a solver for any target.
Use the tool โMaths, puzzles & learning
Maths calculators
Percentage calculator
Find X% of a number, what percent one number is of another, percentage change, add or take off a percentage, and reverse percentages.
Use the tool โFraction calculator
Add, subtract, multiply and divide fractions and mixed numbers, with the answer simplified and the working shown step by step.
Use the tool โLCM & HCF calculator
Find the lowest common multiple and highest common factor (GCD) of up to eight numbers, with a prime factor table that shows why.
Use the tool โPrime number checker
Check whether a number is prime, see its prime factorisation, all its factors, the nearest primes, or list every prime up to 100,000.
Use the tool โQuadratic equation solver
Solve axยฒ + bx + c = 0 with the discriminant, both roots (including complex ones), the vertex and the factorised form, step by step.
Use the tool โMean, median & mode calculator
Mean, median, mode, range, quartiles and standard deviation for any list of numbers, such as marks, prices, runs or temperatures.
Use the tool โRatio calculator
Simplify ratios, share an amount in a ratio, or solve a : b = c : x. Handy for recipes, profit sharing, maps and scaling.
Use the tool โPythagoras theorem calculator
Find the missing side of a right-angled triangle from any two sides, with the area, perimeter and both acute angles.
Use the tool โArea, perimeter & volume calculator
Area, perimeter, circumference, volume and surface area for 12 shapes: rectangle, triangle, circle, cuboid, cylinder, cone, sphere and more.
Use the tool โNumber to words converter (Indian rupees)
Turn numbers into words in the Indian system (lakh, crore) or the international system, with a rupees and paise format for cheques and invoices.
Use the tool โRoman numeral converter
Convert numbers to Roman numerals and back, from 1 to 3999, with the rules and symbol chart.
Use the tool โBinary, decimal & hex converter
Convert between binary, octal, decimal, hexadecimal and any base from 2 to 36, with grouped bits for easy reading.
Use the tool โUnit converter (length, weight, area & more)
Convert length, weight, volume, area, speed, time, data and temperature, including Indian units such as quintal, tola and bigha.
Use the tool โAge calculator
Exact age in years, months and days, total days and weeks lived, next birthday, and age on any date such as a school admission cut-off.
Use the tool โCGPA to percentage calculator
Convert CGPA to percentage (CBSE ร9.5 or your own multiplier), percentage to CGPA, and marks to percentage with a grade band.
Use the tool โScientific calculator
A free online scientific calculator with brackets, powers, roots, logs, trigonometry in degrees or radians, factorials and a history.
Use the tool โStudy timetable maker
List your subjects and hours and get a weekly study timetable with short blocks and breaks, giving the hardest subjects the most time.
Use the tool โMarks percentage calculator
Add subject-wise marks to get total, percentage and a CBSE-style grade, with a best-of option for boards that count the best subjects.
Use the tool โAttendance percentage calculator
Find your attendance percentage, how many classes you can miss and keep 75%, or how many to attend to recover.
Use the tool โSchool class by age calculator
Enter a date of birth and the school cutoff date to see whether your child matches Nursery, LKG, UKG or Class 1 to 12.
Use the tool โMaths revision planner
Enter the exam date and your weekly hours. Get a week-by-week plan counted back from the exam: gaps, topics, full papers and a calm final week.
Use the tool โRubik's Cube
Rubik's Cube & puzzles
Rubik's Cube timer
A speedcubing timer with scrambles for 2ร2 to 7ร7, Pyraminx, Skewb and Megaminx, WCA-style Ao5 and Ao12, inspection time and saved sessions.
Use the tool โRubik's Cube scramble generator
Random scrambles for 2ร2, 3ร3, 4ร4, 5ร5, 6ร6, 7ร7, Pyraminx, Skewb and Megaminx, with a picture of the scrambled cube.
Use the tool โVirtual Rubik's Cube
Play with a 3D Rubik's Cube online: 2ร2 to 5ร5, turn faces with buttons or keys, scramble, undo, and watch all your moves play back.
Use the tool โRubik's Cube notation guide
Learn what R, U, F, R', U2, Rw, M and x mean. Tap any move or famous algorithm and watch it on a cube.
Use the tool โMaths in everyday money
Money, loans & interest
EMI calculator
Monthly EMI, total interest and total payment for any loan, with a year-by-year and month-by-month repayment schedule.
Use the tool โSimple & compound interest calculator
Compare simple and compound interest on any amount, with yearly, half-yearly, quarterly, monthly or daily compounding and a year-by-year table.
Use the tool โNot sure where to start?
Learning something? Try the mental maths practice or the 24 game, or open the Rubik's Cube timer. Parents and students can also see our parents' guide and the student page.
Start a conversation
Questions about a class?
Tell us the learner's age or class and what they would like to try, and we'll point you to a sensible next step.
- Tell us the learnerโs age or grade and goals
- Weโll suggest a suitable class or learning path
- Weโll confirm format, timing and fees with a parent or guardian
Play it, don't just read it
Take a break and play
Free games that need no sign-up. Pick one and play for five minutes.
Pick a game
- Make 24Combine four numbers with + โ ร รท to make exactly 24. Tap a number, anโฆPlay
- Fraction Number LinePlace fractions, mixed numbers, decimals and percentages on a numberโฆPlay
- Percent PowerPractise finding percentages of amounts and understanding percentageโฆPlay
- Ratio RecipeScale recipes and compare quantities while learning to simplify ratios.Play