School & study tools.

Work out an unweighted, weighted, and cumulative GPA on the 4.0 scale from grades and credits.

Percentage and letter grade from questions wrong or points earned, with a printable grading chart.

Make a printable marking chart for every number of points wrong, with optional half points and letter grades.

The score you need on the final exam for the course grade you want.

Attendance percentage, classes needed to reach a target, and classes you can miss.

A revision timetable from your exam dates, exported to your calendar.

Create several local flashcard decks, import two-column text, study due cards and print duplex paper cards.

Words a day to reach a word count by a deadline, with a daily log, pace, and progress chart.

Japanese standard score from score, average, and standard deviation, or the score a hensachi needs.

Abitur grade from Block I and II points by the KMK formula, with the points for the next grade.

Weighted average of German school grades with + and −, and 0–15 points to grades.

PAU access mark out of 10 and admission mark out of 14, with subject weightings.

Baccalauréat général average and mention with the 2026 and 2027 coefficients.

Pass or fail at JLPT N1–N5 from section scores, with the official pass marks and section minimums.

Convert SAT totals to ACT composites and back with the official 2018 concordance tables.

Your IELTS overall band from the four section bands, with the official rounding to the nearest half band.

Convert any grade to the German 1 to 5 scale with the modified Bavarian formula.

ECTS credits to hours of study, years and semesters, and UK credits, and back.

Convert French marks to linear percentages, see the mention band and rescale to a maximum of your choice.

Look up CEFR alignment for English test scores, or compare the published score ranges for a CEFR level.

Compare NATO military ranks by code, with English and native names, or browse eight non-member national ladders without an alignment.

Explore official grade ladders for seven countries, with native terms, English glosses and source-specific examples of posts.

An online scientific calculator with trigonometry, logarithms, powers, roots, factorials, and history.

Plot functions of x with zoom and pan, zeros, intersections, a table of values, and PNG or SVG export.

Differentiate an expression with named rules, a symbolic cross-check, optional point evaluation and a plot.

Find verified antiderivatives or finite definite integrals, with rule-based working, an area plot and a numerical error estimate.

Add, subtract, multiply, and divide fractions and mixed numbers exactly, in simplest form.

Decimals, including repeating ones, as simplest fractions and mixed numbers, with an optional denominator limit.

Mean, median, mode, quartiles, standard deviation, and variance from a list of numbers.

Solve ax² + bx + c = 0 with the discriminant, exact and decimal roots, vertex, and graph.

Determinant, inverse, rank, RREF, and linear systems with exact fractions and steps.

Prime factors with exponents, all divisors, and the GCD and LCM of several numbers.

Square, cube, and nth roots as decimals and simplified radicals.

log, ln, log₂, and any base, with a check and change of base.

Numbers in scientific, engineering, and E notation, and back to standard form.

Count significant figures and round to any number of them, with the rules for zeros.

Percent error between measured and true values, with absolute and signed error.

The missing side of a right triangle from any two sides, with steps and a drawing.

Direct and inverse rule of three with the working shown, and a compound rule of three.

Speed, distance, or time from the other two, in any common unit, with running pace.

Long division with the working laid out step by step, with a remainder or decimals.

Solve any triangle from three known parts: sides, angles, area, and a drawing.

Slope, equation, intercepts, angle, and distance of the line through two points.

The midpoint of two points and the distance between them, with the formulas shown.

Split a length in the golden ratio, or find the whole from one part, with a golden rectangle.

See any fraction as a pie and a bar, with its simplest form, decimal, percent, and equivalents, and compare two fractions.

Put any number in a place value chart, from hundred millions to thousandths, with each digit's value and the expanded form.

Practise reading an analogue clock with a quiz from o'clock to any minute, and print clock worksheets with answers.

Drag an angle around the unit circle, read exact special-angle values and export a full or blank practice chart.

Explore a multiplication grid up to 30 × 30 and download filled or seeded practice charts with separate answer keys.

Balance chemical equations, ionic ones included, with an atom-by-atom check and clear error messages.

Molar mass of any formula, hydrates included, with each element's mass percentage and grams-to-moles conversion.

Explore 118 elements by category or property, search their names and inspect electron configurations and changes of state.

Read 4-, 5-, and 6-band resistor colours, or find the colours for a value, with E12, E24, and E96 standard values.

Voltage, current, resistance, and power from any two, with SI prefixes.

Your weight on the Moon, Mars, Jupiter, and every planet, from NASA's gravity figures.

Find the amount left, starting amount, time, or half-life of a decay.

Solve PV = nRT for pressure, volume, moles, or temperature.

Convert between light-years, parsecs, astronomical units, and kilometres, and see how long light takes.

How old you are on Mercury, Mars, Jupiter, and the other planets, and when your next birthday there is.

Square, dot, isometric, and hexagon graph paper as an exact-size PDF for A4 or Letter.

Wide, college, and narrow ruled paper, handwriting lines, Chinese character grids, and music staves to print.

Printable tian zi ge and mi zi ge practice paper, with optional pinyin lines.

Watch Chinese stroke order, check pinyin and stroke counts, trace characters in a quiz and print practice sheets.

Watch kanji and kana stroke order, inspect numbered steps and print practice squares on A4 or Letter.

Print joined cursive letters, words or sentences with grey tracing rows, blank practice and four-line guides.

Printable addition, subtraction, multiplication, and division worksheets with answer keys and shareable links.

Printable word searches from your own words, in any language, with an answer key.

Turn pasted text or a text file into a repeatable word cloud, with stop words, shapes, a frequency table and image exports.

Printable sudoku, easy to hard, each with exactly one solution, and answer sheets.

Printable mazes from very easy to expert, with one route and a solution sheet.

Printable crosswords from your words and clues, laid out automatically, with an answer page.

Make a class timetable with week ranges, odd/even weeks, rooms and teachers; print, save a phone wallpaper or export to your calendar.

Draw, write, and sketch with pen, shapes, and text; undo, chalkboard backgrounds, full screen, and PNG export.

Random classroom seating in rows or groups, keeping pairs apart, ready to print.

A visual classroom volume monitor that turns red when the room is too loud.

Spelling tests read aloud from your list, with marking and a shareable link.

Draw and print number lines for any range and step, with jumps that show an addition or subtraction.

Print number bond worksheets to 5, 10, 20, 50, or 100, with a part or the whole left blank and an answer key.

Type dates and events and get a clean horizontal timeline, evenly spaced or to scale, as PNG or SVG.

Print name badges for an event from a pasted list of names, with a role line, event name, and colour band.

Make a big, bold sign to print, such as Closed, Out of order, or Wet floor, with text that fills the page.

Print Japanese manuscript paper: 400 or 200 squares, for vertical or horizontal writing, on A4 or B4.

Print your words as dotted or outlined letters with four-line handwriting guides and blank practice rows.

The series resistor for one or more LEDs, rounded to a standard value, with its power rating.

Output voltage, input voltage, or either resistor of a voltage divider, with a diagram.

Read capacitor codes such as 104 or 473J as pF, nF, and µF, or find the code for a value.

Read 3-digit, 4-digit, R, and EIA-96 markings on surface-mount resistors.

AWG sizes to diameter, mm², and copper resistance, and mm² to the nearest AWG.

Minimum PCB trace width for a current and temperature rise, by IPC-2221.

Frequency, duty cycle, and pulse length of a 555 timer in astable or monostable mode.

Decibels to power and voltage ratios, and dBm, dBW, dBV, and dBu to watts and volts.

Frequency to wavelength and back, with half-wave and quarter-wave antenna lengths.

RC time constant, charge and discharge table and curve, and the RC filter cut-off frequency.

Draw on an 8×8 or 16×16 LED matrix and get the byte array for Arduino.

Design 5×8 custom characters for HD44780 LCDs and get Arduino createChar code.

Mean, median, mode, range, and standard deviation of a list of numbers.

The weighted average of values such as grades with credits or exam weightings.

The survey responses needed for a margin of error and confidence level.

nPr and nCr, with or without repetition, as exact numbers.

Z-scores from a value, mean, and SD, and z-scores to percentiles and back, with the normal curve.

One-sample, Welch, Student, and paired t-tests from your data, with p-values.

χ² tests of independence and goodness of fit from counts, with expected values.

One-way ANOVA with F, p, η², and the full ANOVA table.

Pearson's r and Spearman's ρ with p-values and a scatter plot.

Line of best fit, R², standard errors, predictions, and residuals.

p-values from z, t, χ², and F statistics, one- and two-sided.

Cohen's d, Hedges' g, r, overlap, and U3 from two groups' means and SDs.

Confidence intervals for a mean, from summary or data, and for a proportion (Wilson).

Sample size per group for a two-sample t-test, or the power of a planned design.

Cohen's kappa and weighted kappa for two raters from an agreement table.

Per-question means, medians, agreement shares, and stacked bars from Likert responses.

C₁V₁ = C₂V₂ for any unknown, with diluent volume and a serial dilution table.

Mass to weigh for a molar solution, or the molarity or volume from the others.

pH, pOH, [H⁺], and [OH⁻] for strong and weak acids and bases, or from a pH.

Acid and base amounts for a buffer at a target pH by Henderson–Hasselbalch.

Punnett squares for one, two, or three genes, with genotype and phenotype ratios.

Reverse complement, GC content, six-frame translation, and the longest ORF of a DNA sequence.

Primer melting temperature by nearest neighbour, Wallace, and GC methods, with self-complementarity.

Cells per mL and viability from hemocytometer square counts and dilution.

Range, flight time, maximum height, and impact speed for any launch speed, angle, and height, with the path drawn.

Solve the SUVAT equations: enter any three of s, u, v, a, and t to find the other two, with the equation used.

Image distance, magnification, and image height for converging and diverging lenses and mirrors, with a ray diagram.

Angle of refraction and critical angle between two materials, with refractive index presets and a diagram.

Set dot spacing in millimetres or inches, dot diameter, colour and margins for a bullet journal or sketch page.

Print five-line music staves, grand staff, six-line guitar TAB or paired staff and TAB systems with optional clefs.

Print adjustable cue, notes and summary areas, a title and date header, and lined, dotted or blank note space.

Connect logic gates, switches, clocks and LEDs on a board, watch the signals, and generate a circuit truth table.

Turn a boolean expression into a truth table, minimal sum of products, canonical SOP and POS, and a CSV file.

Explore the sky above your horizon for a location and UTC time, with bright stars, the Moon and planets.

Find countries on a world map or name the highlighted shape, then review your score, time and mistakes.

Practise the capitals of 192 countries with multiple choice or typing, continent filters and mistake review.

Estimate DC, single-phase or balanced three-phase voltage drop from one-way length, current, copper or aluminium and AWG or mm².