Tools for students
Coursework, exams and projects come with small jobs that eat time: working out marks, keeping an essay inside a word limit, checking a calculation or getting a file under an upload limit. The tools here are grouped by those jobs. None of them needs installing or an account, so they work on a library or lab computer too.
Gathered from the Math, Science, PDF, Text, Education, Image, Engineering, Utility, Data, Design and Finance categories.
Grades, marks & exams
13 toolsFor working out marks, grades and exam scores.
- Percentage Calculator Eight percentage calculators, each showing the working for its answer.
- CGPA to Percentage Calculator CGPA to percentage by the official rule of your board or university, with the source.
- GPA Calculator Term and cumulative GPA from letter or percentage grades and credits, with the working.
- Grade Calculator Your course grade from weighted categories or points — plus what you need on the rest.
- Marks Percentage Calculator Total, percentage and best-of-five from your subject marks, with a pass check.
- Attendance Calculator Your attendance %, the classes you need for 75% and the ones you can still miss.
Show all 13 Show fewer Grades, marks & exams tools
- Final Grade Calculator What you need on the final for each letter grade, and the grade a final score gives you.
- Z-Score & Normal Distribution Calculator z-scores, normal probabilities and percentiles — with a shaded bell curve and a z-table.
- Exam Score Calculator with Negative Marking Your score from right and wrong answers, with each exam’s official marking scheme.
- Test Grade Calculator Number wrong → percentage and letter grade, with a printable chart for the whole test.
- IELTS Band Score Calculator Your overall IELTS band with the official rounding, and what you need for a target.
- SGPA Calculator Semester grade point average from credits and grades, with the working and backlogs shown.
- CGPA Calculator CGPA from your semester SGPAs and credits, with what-if semesters and a target planner.
Essays & writing
21 toolsFor drafts, word limits and proofreading.
- Word Counter Live word, character and sentence counts with reading time.
- Character Counter Live character counts with X, SMS, search and social media limits.
- Text Diff See what changed between two versions — by line, word or character.
- LaTeX Table Generator Edit a table like a spreadsheet and get clean LaTeX code with the packages it needs.
- Sentence Counter Every sentence with its word count, plus average, median and long-sentence flags.
- LLM Token Counter Exact token counts for OpenAI and open models — your text never leaves the browser.
Show all 21 Show fewer Essays & writing tools
- Reading Time Calculator How long your text takes to read or say — and how many words fill a 5-minute talk.
- Readability Checker Seven readability formulas with their workings, plus the hardest sentences to fix.
- Spell Checker Hunspell dictionaries in your browser: suggestions, replace all, your own word list.
- Passive Voice & Writing Style Checker Find passive voice, wordiness and other habits that make writing hard to read.
- PDF Word Counter Word, character and sentence counts for PDFs — per page, per file and in total.
- Syllable Counter & Haiku Checker Syllables by sound, line by line — with a 5-7-5 check for haiku.
- Text to Handwriting Typed text written out by hand on notebook paper, ready to save as PDF or PNG.
- Document Word Counter Word and character counts for a whole batch of documents — with a quote.
- Rhyme Finder Rhymes by sound, not spelling — plus the rhyme scheme of your lyrics.
- Unicode Character Inspector Paste text to see each character — and the invisible or look-alike ones hiding in it.
- Thesaurus (Synonyms & Antonyms) Synonyms and opposites grouped by meaning, with definitions and examples.
- Inclusive Language Checker Spot words that may exclude or hurt readers — with alternatives and the reason why.
- Sentiment Analyzer Is it positive, negative or neutral? Every sentence scored, with the words behind it.
- Text Summarizer (Extractive) Pick the key sentences of any article — your own words, never rewritten.
- Text Similarity Checker How much do two texts share? Four measures and every copied passage, side by side.
Citations & references
5 toolsFor references and bibliographies.
- APA Citation Generator (7th Edition) APA 7 references and in-text citations, with autofill from a DOI, ISBN or URL.
- MLA Citation Generator (9th Edition) MLA 9 Works Cited entries and in-text citations, built from the core elements.
- Chicago Citation Generator (18th Edition) Chicago 18 notes, bibliography and author-date citations, with a Turabian mode.
- Harvard Referencing Generator Cite Them Right Harvard references, with switches for your university’s version.
- Citation Generator Seven citation styles from one form — autofill from a DOI or ISBN and build your list.
Math
51 toolsFor homework and problem sets.
- Basic Calculator A desk calculator that never drifts: exact decimals, % that works, and a paper tape.
- Circle Calculator One value gives the rest — plus arcs, sectors, segments and the circle’s equation.
- Math Worksheet Generator Printable maths worksheets and answer keys for nine primary skills, made in your browser.
- Matrix Calculator Matrices up to 10 × 10 in exact fractions — every step, from determinants to the SVD.
- Multiplication Table Generator Any times table, a highlighted multiplication chart and a timed quiz, printable as PDF.
- Prime Factorization & Factors Calculator 360 = 2³ × 3² × 5 — with the factor tree, the ladder and every factor.
Show all 51 Show fewer Math tools
- Quadratic Equation Solver Any rearranged quadratic solved exactly three ways, with discriminant, vertex and graph.
- Ratio & Proportion Calculator Simplify, solve, scale and share ratios — with every step shown.
- Standard Deviation Calculator σ and s with the full working — for lists, frequency tables and class intervals.
- Area Calculator Area and perimeter of 22 flat shapes, with the formula, every step and a labelled diagram.
- LCM & HCF (GCD) Calculator HCF and LCM with the working shown three ways — prime factors, ladder and Euclid.
- Mean, Median, Mode & Average Calculator Every kind of average with the working — lists, frequency tables and class intervals.
- Scientific Calculator Type or tap: trig, logs, roots and constants, with exact answers when they exist.
- Significant Figures Calculator Counts sig figs digit by digit, rounds correctly and applies the rules to + − × ÷.
- Slope & Line Equation Calculator Two points, a point and slope, or an equation — every form of the line, with steps.
- System of Equations Solver Linear systems in exact fractions — six methods, every step, and a graph for two unknowns.
- Distance, Midpoint & Section Formula Calculator Distance, midpoint and section formula in 2D or 3D, with every step and a plot.
- Factoring Calculator (Factor, Expand & Simplify) Complete factorisation over the integers with named steps, plus expand and simplify.
- Graphing Calculator Plot equations, curves and regions, then trace them, slide them and share them.
- Number Base Converter Binary, octal, decimal, hex and every base to 36 — exact, with the working shown.
- Scientific Notation Calculator Standard form ⇄ a × 10ⁿ, E notation and SI prefixes — plus + − × ÷ with the steps.
- Volume Calculator Volume of 14 solids with steps and diagrams, in litres, m³, ft³ or gallons, plus weight.
- Fraction Calculator Exact fraction answers with the working shown — LCD, cross-cancelling and all.
- Probability Calculator Exact answers with the working — from coin tosses and dice to Bayes’ theorem.
- Roman Numeral Converter 1994 ⇄ MCMXCIV — with a strict notation check, dates and a full chart.
- Sequence & Series Calculator (AP, GP & Pattern Finder) Arithmetic, geometric and harmonic progressions, pattern finder and exact Σ / Π.
- Square Root & Cube Root Calculator Roots to any precision, simplified radicals with steps, and every complex root.
- Surface Area Calculator CSA, LSA and TSA of 14 solids with formulas, slant-height working and diagrams.
- Trigonometry Calculator Six functions and their inverses, exact values, equations and identity checks.
- Decimal to Fraction Converter Decimals, repeating decimals, fractions and percents — converted exactly, with the method.
- Derivative Calculator Every rule shown — product, quotient, chain — plus partials, implicit dy/dx and tangents.
- Logarithm & Antilog Calculator log, ln and log_b to high precision — with change of base, log laws and log tables.
- Number to Words Converter 12,34,567 → twelve lakh thirty-four thousand … — and back, exactly.
- Permutation & Combination Calculator Exact counts with the formula and steps — and the actual arrangements for small cases.
- Scatter Plot Maker Scatter and bubble charts with trendlines, their equations and R².
- Triangle Calculator Any three values give every side, angle, height, median, radius and centre — with steps.
- Unit Circle Chart & Calculator Drag the point to see (cos θ, sin θ) — and print a unit circle chart.
- Descriptive Statistics Calculator Every summary statistic of your data, with a box plot, histogram and stem-and-leaf.
- Equation Solver Solve for x: exact answers where they exist, every root checked, both sides graphed.
- Integral Calculator Antiderivatives with steps, definite and improper integrals — every answer checked.
- Long Division Calculator Long division written out step by step, in the US/UK or Indian layout.
- Prime Number Checker & Generator Is it prime? Plus factors, next primes, the nth prime, π(x) and twin primes.
- Pythagorean Theorem Calculator a² + b² = c² with every step: exact surds, the converse, box diagonals and triples.
- Sample Size Calculator How many to ask or measure — for a survey, a mean or a comparison of two groups.
- Big Number Calculator Every digit exact: huge sums, products, powers, roots and factorials.
- Long Multiplication Calculator Column, grid or lattice multiplication written out with every carry.
- Order of Operations Calculator (BODMAS & PEMDAS) BODMAS/PEMDAS one step at a time, in exact fractions, with every rule named.
- Percent Error Calculator How far a measurement is from the accepted value — with the working shown.
- Random Word Generator Random nouns, verbs and adjectives for games, prompts and practice — truly random.
- Rounding Calculator Decimal places, sig figs or any multiple — every rounding mode side by side.
- Exponent Calculator Exact powers, radical forms, bˣ = y solved and the exponent laws explained.
Science
42 toolsFor physics, chemistry and biology work.
- Unit Converter Exact conversions for 14 kinds of units, with the formula and a full table.
- AQI Calculator (US EPA & India NAQI) Pollutant readings to AQI, category and health advice — US EPA or India CPCB.
- Capacitor Code Calculator Read any capacitor marking, or find the codes for a value — in pF, nF and µF at once.
- Dilution Calculator (C1V1 = C2V2) & Serial Dilutions C₁V₁ = C₂V₂, mixing, serial dilutions and dilution ratios — with the volumes to pipette.
- Kinetic Energy Calculator KE = ½mv² for any variable, spinning and rolling objects, and a relativity check.
- Molar Mass Calculator Molar mass, % composition and more from any formula, with IUPAC 2024 atomic weights.
Show all 42 Show fewer Science tools
- Ohm's Law Calculator Any two of V, I, R and P give the other two — with the working shown.
- Punnett Square Calculator Any cross from Aa × Aa to a 256-square tetrahybrid, with ratios and a χ² test.
- Speed, Distance & Time Calculator Speed, distance or time from the other two — in any units, with the working shown.
- Acceleration Calculator Acceleration three ways — or any other variable — with g-force and 0–100 km/h times.
- Density Calculator ρ = m/V for any variable, shape volumes, specific gravity and a float-or-sink check.
- DNA to Protein Translator (Transcription & Translation) DNA → mRNA → protein in any frame and any NCBI genetic code, with an ORF finder.
- Grams to Moles Calculator Mass, moles, particles and gas volume of any substance, with every step shown.
- Moon Phase Calculator & Moonrise Times Today’s Moon or any date’s — phase, moonrise, supermoons and eclipses.
- pH Calculator Exact pH of acids, bases, salts and mixtures — or convert pH, pOH, [H⁺] and [OH⁻].
- Series & Parallel Resistor Calculator Combine parts, solve whole networks and make odd values from two standard parts.
- Chemical Equation Balancer Smallest whole-number coefficients for any reaction, checked atom by atom.
- Ideal Gas Law Calculator (PV = nRT) PV = nRT in any units, plus gas density, molar mass, STP volumes and real gases.
- Reverse Complement Generator (DNA/RNA) Reverse-complement any DNA or RNA — FASTA, GenBank or plain — with IUPAC codes.
- Specific Heat & Heat Energy Calculator q = mcΔT for any variable, phase changes with latent heat, and calorimetry.
- Sunrise, Sunset & Golden Hour Calculator Sun times for any place and date — twilight, golden hour and day length included.
- SUVAT Calculator (Kinematic Equations) Any three of s, u, v, a, t in — the other two out, with both roots and every substitution.
- Voltage Divider Calculator Divider output, the resistors for a target voltage, and bridges — with the load included.
- Dew Point, Humidity & Wet-Bulb Calculator Dew point, humidity and wet bulb from any one humidity reading, in °C or °F.
- Force Calculator (Newton’s Second Law) F = ma for any variable, weight on any planet, and the resultant of several forces.
- Gas Laws Calculator (Boyle, Charles, Combined) Two-state gas laws, partial pressures, gas over water and effusion — in any units.
- LED Resistor Calculator The right resistor for your LEDs, its wattage, the real current and the power wasted.
- Stoichiometry & Limiting Reactant Calculator Limiting reactant, excess, theoretical and percent yield — step by step.
- Wavelength, Frequency & Photon Energy Calculator λ, f, T, wavenumber and photon energy for light or sound — with the band and colour.
- Weight & Age on Other Planets How much you’d weigh — and how old you’d be — on other worlds, from NASA data.
- Electron Configuration Calculator Any element or ion: configuration, orbital diagram, exceptions and quantum numbers.
- Empirical & Molecular Formula Calculator From percentages, masses or combustion data to a formula, with every rounding shown.
- Half-Life & Radioactive Decay Calculator (incl. Carbon Dating) Half-life maths for any isotope, with activity in Bq or Ci, carbon dating and rock ages.
- Heat Index Calculator (Feels-Like Temperature) How hot it feels: the NWS heat index, its risk category, humidex and apparent temperature.
- Projectile Motion Calculator Range, height and flight time from any launch — with air drag and a target solver.
- Resistor Color Code Calculator Colours to ohms and ohms to colours — IEC 60062:2016, with the E-series check.
- Free Fall Calculator (with Air Resistance) How long a fall takes and how fast it ends — with or without air resistance.
- Interactive Periodic Table Every element’s data, trend heat maps, search, filters and side-by-side comparison.
- Lewis Structure Generator (with VSEPR Shape) Lewis structures with formal charges and resonance, plus VSEPR shape and polarity.
- Molarity Calculator Mass to weigh, molarity or volume — with a ready-to-follow preparation recipe.
- SMD Resistor Code Calculator Read chip-resistor markings or find the code for a value — every scheme, both ways.
- Wind Chill Calculator & Frostbite Time How cold the wind makes it feel, and how fast exposed skin can freeze.
Study & revision
5 toolsFor planning, timing and practising.
- Countdown Timer Live days, hours, minutes and seconds until any date, in any time zone.
- Stopwatch Start, pause and record laps with split times — exact even in background tabs.
- Timer Presets or any duration, several at once, with an alarm that rings until you stop it.
- Typing Speed Test Find your WPM in English or Hindi — with live accuracy and the keys you miss most.
- Study Focus Timer Focus sessions and breaks, with tasks, a session log and daily stats saved on your device.
Files for assignments
37 toolsFor getting documents and photos ready to submit.
- Image Compressor Make photos and graphics smaller — or fit them under a KB limit — without uploading.
- Image Resizer Exact pixel or print sizes, social presets, crop or pad to fit — in your browser.
- Merge PDF Combine PDFs in any order, with page ranges, bookmarks and links kept.
- Split PDF Break a PDF into single pages, page ranges or equal parts — preview first.
- PDF to Image Converter Turn PDF pages into sharp PNG or JPG images, right in your browser.
- PDF Compressor Shrink PDFs by recompressing their images — real sizes, nothing uploaded.
Show all 37 Show fewer Files for assignments tools
- PDF Page Extractor Extract, delete, reorder or rotate pages — click thumbnails or type ranges.
- Compress PDF to Exact Size (100 KB, 200 KB, 1 MB) Choose a limit and get the sharpest PDF that fits under it — made on your device.
- Image to PDF Converter (JPG, PNG, HEIC to PDF) Put photos, scans and screenshots into one tidy PDF — in any order, on any paper size.
- Photo & Signature Resizer for Exam Forms Exam-form photos and signatures at the right pixels and KB — in one step, on your device.
- PDF to Word Converter Turn a PDF into a Word document you can edit — headings, lists and tables included. Pro tool
- Word to PDF Converter Preview a .docx page by page and save it as a PDF with real, selectable text. Pro tool
- PDF to Excel Converter Turn tables in a PDF into a spreadsheet — columns you can fix, numbers that add up. Pro tool
- Bulk Image Resizer for Marketplaces One preset for a whole folder of photos: sized, padded, renamed and zipped on your device. Pro tool
- PDF Table to Excel / CSV Box the table once — get every page of it as one clean spreadsheet. Pro tool
- PDF to Text Extractor Pull clean, copyable text out of a PDF — in reading order or with its layout kept.
- SVG Optimizer Shrink SVG icons and illustrations with SVGO — previewed safely, nothing uploaded.
- OCR PDF (Make Scanned PDFs Searchable) Recognise the text in scans and photos — and get a searchable PDF, plain text or hOCR. Pro tool
- Passport & Visa Photo Maker Face-guided passport and visa photos, sized to the official rules — made on your device.
- Extract Images from PDF Get every picture out of a PDF at its original quality — nothing is uploaded.
- PDF to Markdown Converter Turn a PDF into Markdown or HTML — headings, lists, tables, code and pictures included. Pro tool
- Signature Maker Draw it or type it, and get a clean transparent signature file for any document.
- Markdown to PDF Converter Markdown in, a clean, print-ready PDF out — tables, code, footnotes and all.
- Passport & Exam Photo Studio (Batch for Studios and Cyber Cafés) Passport, visa and exam photos for every customer, made on the shop’s own computer. Business tool
- HTML to PDF Converter HTML code, a saved web page or a ZIP of one — to a PDF, safely and privately. Pro tool
- PDF to Grayscale / Black & White Make a colour PDF gray for cheaper printing, black and white, or a night-reading negative.
- Repair PDF Rescue a PDF that won’t open — and see exactly what was wrong with it.
- Bank Statement PDF to Excel / CSV Turn a statement PDF into a clean, checked transaction table for Excel. Pro tool
- Flatten PDF Make form fields, comments and layers part of the page — or turn pages into images.
- Text to PDF Converter Plain text, logs and code to a clean PDF — with headers, page and line numbers.
- Excel to PDF Converter (XLSX, CSV) Spreadsheets to print-ready PDFs — formatting, page setup and header rows kept. Pro tool
- Transparent Signature Maker Photo of your signature in, clean transparent PNG out — shadows and paper removed.
- PDF to PowerPoint (PPTX) Every page becomes a slide — a sharp picture of the page, with its text in the notes. Pro tool
- Email to PDF (EML, MSG) A saved e-mail as a PDF — header, message, pictures and attachments in one file. Pro tool
- SVG to PDF (Vector) SVG drawings as sharp vector PDF pages — paths, gradients and text kept as vectors.
- Split PDF Pages in Half Turn two-page scans and 2-up sheets back into single pages — without losing quality.
- Interleave PDF Pages (Collate Scans) Put single-sided scans of a double-sided document back in order.
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Good to know
- 169 of 174 tools run entirely in your browser. The other 5 explain on their pages what they send and why.
- 139 of 174 keep working without a connection once loaded.
- Calculator results and templates are starting points for planning, not medical or engineering advice. Check the method and assumptions on each tool’s page.
- Nothing to install and no account. 161 of the 174 tools are free to use without a limit; the other 13 are Pro and Business tools, which can be tried free every day, and a pass that unlocks them lifts that daily limit.
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