For students 94
Step-by-step equation and calculus solvers, unit conversion, grade calculators, study timers
Units & math 25
- Triangle & Angle CalculatorEnter a run and a rise to get the slope length and angle. Solves right, isosceles and general triangles, and arcs
- Function GrapherType an equation and see its graph on the coordinate plane — made for the classroom screen
- Percentage & Percent Change CalculatorFind what percent of a number is, X as a percent of Y, percent increase or decrease, and a price after a discount, all on one screen as you type
- Unit Converter — Length, Weight & TempConvert inches to cm, lbs to kg, °F to °C, psi to bar and GB to GiB across 19 categories, with every unit shown at once like a conversion chart.
- Discount CalculatorSale price from a percent off, or the percent off from two prices
- Fraction CalculatorAdd, subtract, multiply and divide fractions, with the steps shown
- Area & Volume CalculatorArea and perimeter of flat shapes, volume and surface area of solids
- Proportion & Ratio CalculatorSolve a : b = c : x, simplify ratios and split an amount by a ratio
- Scientific CalculatorA scientific calculator with trig, logs, powers and history
- Matrix CalculatorAdd and multiply matrices, and find the determinant, inverse, transpose, rank and RREF
- Permutation & Combination CalculatornPr, nCr, factorials, and versions with repetition
- Derivative CalculatorDifferentiate a function symbolically, with the rules used and a graph of f and f′
- Integral CalculatorEvaluate definite integrals with the area shaded, and find antiderivatives of common forms
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 with the quadratic formula, with steps, exact roots and a graph
- System of Equations SolverSolve 2 to 4 linear equations with steps by elimination, in exact fractions
- Slope, Distance & Midpoint CalculatorDistance, slope, midpoint and line equation from two points
- Factoring CalculatorFactor polynomials step by step, or expand a product
- GCF & LCM CalculatorGreatest common factor and least common multiple of several numbers, with the working shown
- Prime Factorization CalculatorBreak a number into prime factors, with a factor tree, all divisors and a prime check
- Long Division CalculatorQuotient and remainder with every step of the long division written out
- Rounding CalculatorRound to decimal places, to the nearest ten, hundred or any multiple, or to significant figures
- Unit Circle & Trig ValuesDrag an angle around the unit circle to see sin, cos and tan, with the exact values for special angles
- Scientific Notation ConverterConvert numbers to and from scientific, engineering and E notation, and calculate with them
- Roman Numeral ConverterConvert numbers to Roman numerals and back, including years and dates
- Linear Interpolation CalculatorFind a value between two known points, or look up in-between values in a table, with bilinear interpolation
Students 24
- Cornell Notes TemplatePrint a Cornell notes page at your spacing, or type into one on screen
- Equation EditorWrite an equation, preview it, and take it away as an image (PNG, SVG) or LaTeX code
- Group Meeting Time FinderOverlay everyone's availability to find a time that works for all. No accounts — it travels in a link
- GPA & Grade Scale ConverterConvert between 4.0, 4.3 and 4.5 GPA scales, percentages, letter grades and 10-point CGPA
- Timetable MakerBuild a weekly class schedule, then save it as an image or print it
- Attendance & Absence CalculatorHow many classes you can still miss and stay above the required attendance
- Table to LaTeX & MarkdownPaste a spreadsheet table and get LaTeX, Markdown or HTML table code
- FlashcardsMake two-sided cards and flip through them; the ones you miss come back more often
- Fill-in-the-Blank Study ToolPaste your notes, hide the key words and test yourself
- Study Time TrackerTime your study sessions by subject and see daily and per-subject totals
- Study PlannerEnter your exam dates and what you need to cover, and get a day-by-day plan
- Grade Calculator (Weighted)Work out your current grade from assignment, midterm and final scores and their weights
- Elevator Pitch PracticePractise a one-minute self-introduction with a timer and recording
- Ticket Drop Click PracticePractise clicking the instant a countdown hits zero; see your reaction time in milliseconds
- Essay Outline BuilderFill in thesis, arguments and evidence to plan an essay
- GPA CalculatorCalculate semester and cumulative GPA on the 4.0 scale, weighted or unweighted
- Final Grade CalculatorWhat you need on the final exam to finish with the grade you want
- Citation Generator (APA, MLA, Chicago)Enter a book, article or web page and get the reference in APA, MLA or Chicago style
- English Vocabulary QuizPractise English words by level: pick the meaning, spell it, or listen and type
- Mind Map MakerGrow a mind map quickly from the keyboard and save it as an image
- Flag Quiz & Capitals QuizGuess the country from its flag and match countries with their capitals
- English Irregular Verbs List & QuizA searchable table of irregular verbs with past and past participle forms, plus a drill
- Function Grapher & Equation VisualizerGraph linear, quadratic, cubic, quartic and general functions; see roots, vertex, intercepts and intersections, derivative and tangent lines, and the area of a definite integral, with coefficient sliders
- Equation Solver with StepsSolve linear, simultaneous, quadratic, cubic and quartic equations step by step and see the roots on a graph
Also on this shelf 45
- White NoisePlay white, pink or brown noise, rain and more for focus or to settle a baby, with a sleep timer
- Voice RecorderRecord from your microphone and save the file. Recordings stay on your device
- 3D Shape NetsWatch the nets of cubes, prisms, pyramids, cylinders, cones and Platonic solids fold into 3D, and print them to build
- Teaching ClockAn analog clock with movable hands for teaching and practising telling the time
- Fraction Bars & CirclesShow fractions as bars and circle pieces and compare them
- Printable Graph, Lined & Music PaperMake graph paper, lined paper, dot grid and music staff paper at any spacing, ready to print
- Days Until & Days Since CalculatorCount how many days until an exam, trip or birthday, or the days since a date. Shows 100 days from today, day 1000, anniversary dates and weekdays left.
- Pomodoro TimerA focus timer that alternates 25 minutes of work with 5-minute breaks
- Millisecond Clock for Ticketing (Server-Synced)Standard time to the millisecond, corrected with this site's server, with a countdown and alert beeps for ticket sales and registrations, and how far your device clock is off
- Truth Table GeneratorEnter a logic expression to get its truth table and a simplified form
- Student Loan Repayment CalculatorMonthly payment, total interest and payoff date for student loans
- Online Ruler — actual size cm and inchAn actual size cm, mm and inch ruler for your phone or monitor. Calibrate with a bank card or coin, measure between two cursors and add up long objects
- Online ProtractorMeasure an angle with a protractor on your screen, or on top of a photo
- Error Propagation & Significant Figures CalculatorPropagate measurement uncertainty through a formula and round the result to the right significant figures
- Molarity & Dilution CalculatorMass needed for a molar solution, and C1V1 = C2V2 dilutions
- Molar Mass CalculatorType a chemical formula to get its molar mass and percent composition
- Periodic TableAn interactive periodic table: tap an element for its atomic weight, configuration and more
- Physical ConstantsLook up and copy physical and chemical constants such as c, h, k and Avogadro's number
- Statistics CalculatorPaste data to get descriptive statistics, t-tests, ANOVA, correlation and regression, each with a plain-language reading
- Chart MakerPaste data to draw box plots, histograms, scatter plots, Pareto charts and more, then save as an image
- Probability Distribution CalculatorProbabilities and critical values for the normal, t, chi-square and F distributions
- Sample Size CalculatorHow many responses or samples you need for a given confidence level and margin of error
- Typing Speed TestType the passage and get your words per minute and accuracy
- Word Counter & Character Count ToolCount characters with and without spaces, words, sentences, paragraphs and UTF-8 bytes as you type, with a character limit bar and reading and speaking time.
- Words to Pages ConverterHow many pages a word count makes, and the other way round, by font and spacing
- Speech & Reading Time CalculatorEstimate how long a script takes to say aloud or to read
- Sentence of the dayOne sentence a day in the language you are learning: listen, repeat, rebuild it from its words, then type it
- Flash drillA word flashes for a moment and disappears. Recall it, check, and it comes back at the right interval
- Copywork Sheets (handwriting practice)Turn a poem, a classic passage or any text you paste into printable copywork pages to trace or copy by hand, on ruled lines, squares or vertical columns, in the font you choose
- Times Tables & Mental Math PracticeTimed practice for multiplication tables and arithmetic, with your weak spots repeated
- Habit TrackerTick off daily habits and watch your streaks, stored only on this device
- Voice Typing (Speech to Text)Speak and get text, using your browser's speech recognition
- Number Base Converter (Binary, Hex, Decimal)Convert between binary, octal, decimal, hexadecimal and any base, with steps and bitwise operations
- Chemical Equation BalancerBalance a chemical equation with the smallest whole-number coefficients
- Venn Diagram MakerFill in a 2- or 3-circle Venn diagram and print it or save it as an image
- Number Line GeneratorDraw number lines with your range and steps, and print them as fill-in-the-blank worksheets
- Curve Fitting CalculatorFit a line, polynomial, exponential, logarithmic or power curve to your data and get the equation and R²
- Equation Worksheet Maker (Linear · Quadratic · Cubic · Quartic)Generate linear, quadratic, cubic and quartic equation practice by grade level, with answer keys, to print or save as PDF
- Calculus Worksheet Maker (Derivatives · Integrals)Generate derivative and integral practice — polynomials, product and chain rule, indefinite and definite integrals — by level, with answer keys, to print or save as PDF
- Picture Addition & Subtraction WorksheetsMake counting, addition and subtraction problems with pictures (apples, candies, stars…) for preschool and first grade, with answer keys, to print or save as PDF
- Base Ten Blocks — Carrying and Borrowing VisualizedEnter two numbers and watch hundreds, tens and ones blocks regroup step by step to explain carrying in addition and borrowing in subtraction, plus arrays for multiplication and sharing for division
- Fraction Visualizer — Why Flip and Multiply?Enter any fraction operation and see it explained with moving pictures: common denominators, the area model for multiplication, and why dividing means multiplying by the reciprocal
- Soma Cube Solver (3D step by step)Shows how the 7 Soma pieces build the 3×3×3 cube and dozens of figures, one piece at a time in 3D; enter any shape and it finds a solution
- Pentomino Puzzle SolverSolve 6×10, 5×12, 4×15 and 3×20 rectangles or any shape you draw with the 12 pentominoes, see every solution, and get a hint for the next piece
- Sudoku Solver with Hints (scan from photo)Photograph or type a sudoku, get the solution, and learn which rule fills the next cell step by step; also 4×4 and 6×6 kids' sudoku