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BMI, TDEE, calorie deficit, heart rate zones, fitness timers and more
Loan EMI, mortgage, compound interest, SIP and money calculators
Online ruler, age calculator, word counter, date difference and more
Step-by-step solvers for quadratic equations and expressions
Projectile motion, SUVAT, optics, waves and forces with diagrams
Molar mass, equations, pH, periodic table and more
JSON formatter, JWT decoder, regex tester, UUID generator and more
Standard deviation, distributions, hypothesis testing and more
Riemann sums, derivatives, integrals and limits with working shown
Planets, stars, cosmic distances and space calculators
Sorting visualizers, binary arithmetic, logic gates and algorithms
Area, volume, triangles, trig functions and more
DNA, genetics, ecology and life science calculators
Results
Measure objects on your screen with a pixel-accurate virtual ruler.
Find your exact age in years, months, days, hours and minutes.
Count words, characters, sentences and estimate reading time instantly.
Convert text between UPPER, lower, Title, camelCase, snake_case and more.
Pick a random name or item from your list with an animated spinning wheel.
Calculate the exact number of days, weeks or months between two dates.
Convert between units of length, weight, temperature, volume, speed, data, and more — fast, accurate, bidirectional conversions.
Calculate the tip and total for any bill, split it between any number of people, and round up — fast, with preset and custom tip percentages.
Calculate a missing width or height from an aspect ratio, or simplify any resolution to its ratio — with common presets and a live proportion preview.
A simple online countdown timer — set a duration or count down to a date and time, with presets, an alarm, and a screen that stays awake.
A precise online stopwatch with lap and split times — start, stop, and record laps, with fastest/slowest highlighting and centisecond accuracy.
Generate strong, random passwords in your browser — adjustable length, character options, a strength meter, and one-click copy. Nothing leaves your device.
Pick a color and convert instantly between HEX, RGB, and HSL, with alpha support, a live preview, and one-click copy.
Create QR codes free from a URL, text, WiFi, contact, and more — customise size and colors, and download as PNG or SVG. Everything stays in your browser.
Solve any percentage problem — percent of a number, percentage change, percentage increase/decrease, and more — with clear results and working.
Convert numbers to Roman numerals and back instantly, with validation and an optional breakdown — supports 1 to 3,999.
Instantly see your screen resolution, browser viewport size, pixel ratio, color depth, and aspect ratio — detected live, with a copy button.
Generate lorem ipsum placeholder text by paragraphs, sentences, or words — with a classic-start option, HTML output, and one-click copy.
Calculate your BMI in metric or imperial units, see your WHO weight category, and view the healthy-weight range for your height.
Format, validate, minify and compare JSON data instantly.
Decode and inspect JWT tokens or encode new ones, fully client-side.
Encode or decode Base64 strings and files including images.
Encode and decode URLs and query parameters online, with component and full-URL modes and full Unicode support — all in your browser.
Test and debug regular expressions live — highlight matches, inspect capture and named groups, and try replacements, all in your browser.
Convert Unix timestamps to human-readable dates and back, in seconds or milliseconds, UTC or local time — with a live current-timestamp readout.
Parse cron expressions online — get a plain-English description and the next 10 run times.
Generate UUID v4, v7, and ULID values in bulk — free, client-side, cryptographically secure.
Encode and decode HTML entities — named, decimal, and hex — with full Unicode support, safely in your browser.
Generate complementary, analogous, triadic, and monochromatic color palettes from any base color — copy HEX, RGB, or HSL codes instantly.
Build linear, radial, and conic CSS gradients visually — add color stops, adjust angles, preview live, and copy the CSS.
Write Markdown and see the rendered HTML output side by side.
Compare two texts and highlight the differences — line and word-level, side-by-side or inline — entirely in your browser.
Format and beautify SQL queries online for MySQL, Postgres, and SQLite — with keyword casing, indent options, and a minify mode, all in your browser.
Look up any HTTP status code instantly — all 1xx–5xx codes with plain-English descriptions, searchable and filterable by class, with one-click copy.
Minify HTML, CSS, and JavaScript online to shrink file size — with a bytes-saved readout and copy/download, all in your browser.
Solve any quadratic equation with step-by-step working, real and complex roots, discriminant analysis, and a parabola graph.
Solve 2×2 and 3×3 systems of linear equations with full step-by-step working — substitution, elimination, and special-case handling, all in your browser.
Factor any polynomial expression fully — GCF, difference of squares, trinomials, cubes, and grouping — with step-by-step working shown, all in your browser.
Calculate slope, intercepts, and the equation of a line from two points, a point and slope, or an equation — with step-by-step working and a live graph.
See how much you'd weigh across two planetary systems — our Solar System and the real TRAPPIST-1 exoplanet system — by entering your weight just once.
Find out how old you'd be on Mars, Jupiter, and even planets in the TRAPPIST-1 system — enter your birth date once and compare your age across worlds.
See the Moon's phase for any date — phase name, illumination, and the dates of the next new and full moon, with a visual moon.
Convert light-years to kilometers, miles, AU, and parsecs instantly, or find how long light takes to travel any distance.
Calculate the escape velocity of any planet, moon, or star — or enter a custom mass and radius.
Calculate compound interest with adjustable compounding frequency, regular contributions, and a year-by-year growth breakdown.
Calculate the molar mass of any chemical formula with a per-element breakdown, percent composition, and mass-to-moles conversion.
Find the empirical and molecular formula of a compound from percent composition or mass data.
Calculate population and sample standard deviation with full step-by-step working, plus mean, variance, and more from your data set.
Paste a data set and get all descriptive statistics plus a histogram.
Convert between a z-score and a percentile with a shaded bell curve.
Approximate the area under a curve with left, right, midpoint, and trapezoidal Riemann sums, visualised against the function.
Differentiate functions step by step showing chain, product and quotient rules, with a graph and higher-order derivatives.
Calculate range, maximum height, flight time, and impact velocity, and watch the trajectory animate on a live canvas.
Solve for any two unknowns using the five kinematic equations, with step-by-step working.
Work out your monthly loan payment (EMI), total interest, and total repayment, with a full amortization schedule and a principal-vs-interest breakdown.
Estimate your monthly mortgage payment including taxes, insurance, and PMI, with a full amortization schedule and total-cost breakdown.
Estimate the future value of your SIP and lump-sum investments, with total invested vs returns, a step-up option, and a year-by-year growth breakdown.
See how inflation erodes the buying power of money over time, or compare historical values between any two years.
Alternates 3-minute fast and slow walking cycles with audio cues and session tracking.
A customisable HIIT interval timer with adjustable work and rest periods, rounds, audio cues, and a screen that stays awake.
Convert your steps into distance, time, and calories burned using your height, weight, and pace — with optional progress toward a daily step goal.
Estimate your VO2 max from a resting heart-rate, Cooper, 1.5-mile run, or Rockport walk test, with age and sex reference ranges — an educational fitness estimate.
Calculate running pace, finish time, or distance from any two values, with per-km/mile splits, race finish-time predictions, and metric or imperial units.
Estimate calories burned for any activity — walking, running, cycling, sports, gym and more — from your weight and duration using standard MET values.
Estimate your one-rep max from a weight-and-reps set using Epley, Brzycki, and other formulas, with a training-percentage table — no risky max-out needed.
A fast, no-fuss rest timer for between sets — quick presets, a big one-tap countdown, set counter, audio cue, and a screen that stays awake.
Estimate your daily water intake from your body weight and activity level, in metric or imperial units, with a clear guide to how hydration needs vary.
Understand calorie deficits and energy balance — estimate your maintenance calories and learn how a deficit works, with clear safe-use guidance.
See how a calorie intake splits into protein, carbs, and fat using preset or custom ratios — an educational reference with a clear guide to each macronutrient.
Compare what classic formulas (Devine, Robinson, Miller, Hamwi) and the BMI healthy range suggest for your height — shown as a range of reference estimates, not a target.
Find your five heart rate training zones from your age and max heart rate, with optional resting-HR personalisation and a clear guide to what each zone is for.
Enter a blood pressure reading you've measured to see which standard AHA category it falls into — a reference, not a diagnosis.
Measure your resting pulse and see which standard range it falls into — normal, low, or high — with age and fitness context. A reference, not a diagnosis.
Estimate your pregnancy due date from your last period, conception date, or ultrasound — with your current gestational age, trimester, and a normal due window.
25-minute focus blocks with 5-minute short breaks and 15-minute long breaks.
A guided breathing timer with an animated pacer for box breathing, 4-7-8, and Wim Hof–style rounds, with audio cues and a screen that stays awake.
Reflect on recent life changes with the Holmes-Rahe stress scale — tick the events from your past year to see a general stress-load score, with supportive context.
Estimate your Total Daily Energy Expenditure from your BMR and activity level, in metric or imperial units, with a clear breakdown of how it's calculated.
Check blood type transfusion compatibility for donors and recipients, and predict a child's possible blood types from the parents' types.
Watch sorting algorithms run step by step — bubble, selection, insertion, merge, quick, and heap sort — with adjustable size and speed and Big-O complexity info.
Solve any triangle given any 3 values using SSS, SAS, ASA, AAS, or the ambiguous SSA case, with a diagram and steps.
Transcribe a DNA strand into its mRNA transcript instantly, with base-by-base display and GC content.
Click any of the 16 standard angles, or drag freely, to see exact sine, cosine and tangent values with a reference triangle.
Solve for voltage, current, resistance or power from any two known values, with unit conversion and a formula triangle.
Find the event horizon radius of Earth, the Sun, Sagittarius A*, or any custom mass using r = 2GM/c².
Convert between binary, octal, decimal and hexadecimal live as you type, with step-by-step positional-weight and division working.
Calculate a confidence interval for a mean (z or t interval) or proportion, with margin of error and critical value shown step by step.
Build a monohybrid or dihybrid Punnett square from two parent genotypes with the full offspring grid and genotype/phenotype ratios.
Find the limiting reactant, theoretical yield, and leftover excess reagent for any balanced chemical reaction.
Find the break-even point in units and revenue from fixed costs, variable cost, and price, with contribution margin and a chart.
Compute all six trig functions for any angle, or find the angle from a ratio using inverse trig, with exact values shown.
Apply Newton's second law to solve for force, mass, or acceleration, with unit conversion and an optional net-force mode.
Apply AND, OR, XOR, NOT, NAND, NOR and bit shifts to decimal, hex, or binary numbers with aligned bit-column visualization.
Convert between apparent magnitude, absolute magnitude, and distance, plus compare star brightness with the Pogson ratio.
Find the p-value from a z, t, chi-square, or F statistic with a shaded distribution graph and significance flags.
Solve oblique triangles for ASA, AAS, and SSA, with full ambiguous-case handling and step-by-step working.
Balance any chemical equation instantly using linear algebra, with an atom-count verification table.
Browse the full 64-codon genetic code table, look up any amino acid, and translate an mRNA sequence.
Solve v=fλ and T=1/f for wave speed, frequency, wavelength, or period, with unit conversion and an animated wave.
Calculate a galaxy's recession velocity or distance using Hubble's law with an adjustable Hubble constant.
Apply Kepler's third law to find the orbital period of any body from its semi-major axis and central mass.
Add, subtract, and multiply binary numbers with full carry, borrow, and partial-product working shown.
Find percentage increase or decrease between two values, or reverse a known percentage change to find the original value.
Run one-sample, two-sample (Welch), or paired t-tests and get the t-statistic, degrees of freedom, and p-value.
Solve for any side of a right triangle from the other two, with a scaled diagram and steps shown.
Compute definite integrals with Simpson's rule, with symbolic antiderivatives shown for polynomial and 1/x functions.
Convert between moles, mass, and particles for any species in a balanced chemical equation.
Evaluate limits as x approaches a value or infinity, with left/right limits and L'Hôpital's rule shown.
Find allele and genotype frequencies from an allele frequency, or test genotype counts for Hardy-Weinberg equilibrium.
Calculate work done, kinetic energy, gravitational potential energy, and power, with formulas shown.
Convert between currencies using live exchange rates, with a swap button and a multi-currency quick view.
Convert between pH, pOH, [H+], and [OH-], with a strong acid/base mode and a visual acid-base scale.
A searchable Big O reference table, growth-rate chart, and an operations estimator for any input size N.
Solve SAS and SSS triangles using the law of cosines, with step-by-step working and a diagram.
Calculate AND, OR, and conditional probabilities for two events, including Bayes' theorem, with a Venn diagram.
Calculate GC content, base composition, and melting temperature from any DNA/RNA sequence, with FASTA support.
Calculate gravitational force using Newton's law of universal gravitation, with planet presets and scientific notation.
Convert CTC to take-home pay for India (new/old tax regime) or gross salary to net pay for the US.
Calculate an object's angular diameter, true size, or distance, with Moon/Sun/Jupiter presets.
Solve C1V1=C2V2 for any missing value, or work out a full serial dilution series step by step.
Convert signed integers to two's complement binary and back, with step-by-step working and overflow checks.
Find all real and complex roots of any polynomial equation, with a graph and verification.
Explore all 118 elements with full data, category color-coding, and search.
Find the best-fit line equation, R², and correlation for your x,y data, with a scatter plot.
Convert between degrees, radians and gradians with an exact π fraction form and a unit circle diagram.
See how time slows down as you approach the speed of light, using special relativity's Lorentz factor.
Find radius, diameter, area and circumference from any one value.
Visualise the recursion tree for any recurrence relation.
Calculate nPr and nCr with step-by-step factorial working.
Expand functions as Taylor series and plot partial sums.
Calculate the arc length of a curve with the formula and graph.
Find volumes using the disk or shell method with a 3D visual.
Find the electrostatic force between two point charges.
Calculate GST-inclusive or exclusive prices at any rate.
Solve PV=nRT for any variable with real gas comparison.
Calculate concentrations at each step in a serial dilution series.
Distinguish between sidereal and synodic orbital periods.
Calculate the area of triangles, rectangles, circles, trapezoids and more.
Generate truth tables for any boolean expression.
Find probabilities and plot the full binomial distribution.
Calculate radioactive decay with an exponential decay graph.
Calculate the period of a pendulum with an animated visual.
Find the final price and savings for any original price and discount.
Calculate the volume of spheres, cylinders, cones, cubes and pyramids.
Model exponential and logistic population growth with graphs.
Calculate the molecular weight of a protein from its amino acid sequence.
Estimate your sky quality and what you can observe from your location.
Convert numbers to and from scientific notation, and perform arithmetic on them.
Tally your assets and liabilities to find your net worth.
Solve linear, quadratic, and compound inequalities with a number line.
Simplify ratios, solve proportions, scale ratios, and split a total by ratio.
Convert a quadratic to vertex form with full algebraic steps.
Solve any cubic equation for all three roots using Cardano's formula.
Find the GCF and LCM using prime factorisation with a Venn diagram.
Add, subtract, multiply and divide fractions with step-by-step simplification.
Add, multiply, find the determinant and inverse of matrices with full steps.
Divide polynomials step by step in a clear vertical layout.
Simplify algebraic expressions with each rule shown.
Calculate logarithms in any base with change-of-base steps shown.
Calculate the midpoint and distance between two coordinates.
Calculate fixed deposit maturity value with compound interest.
Calculate return on investment and annualised return.
Get the full and noble-gas shorthand electron configuration for any element or ion.
Build a Huffman tree and encode any string with compression stats.
Run goodness-of-fit and independence tests with observed vs expected data.
Solve classic related-rates problems with implicit differentiation steps.
Approximate integrals with the Trapezoidal, Simpson's, or Midpoint rule.
Solve Boyle's, Charles's, Gay-Lussac's, Avogadro's, and Combined Gas Law problems.
Calculate percent yield from actual and theoretical yield.
Convert between molarity, molality, percent mass and ppm.
Use the Henderson-Hasselbalch equation for buffer pH problems.
Calculate ΔH of reaction using Hess's law and formation enthalpies.
Balance redox equations by the half-reaction method in acidic or basic solution.
Convert between Ksp and molar solubility for sparingly soluble salts.
Add, subtract vectors and find dot product, cross product and magnitude.
Solve Q=mcΔT for any variable with a material reference table.
Animate push, pop, enqueue, and dequeue operations on stacks and queues.
Build and simulate circuits using AND, OR, NOT and XOR gates.
Convert characters to ASCII codes, hex and binary representations.
Animate breadth-first and depth-first traversal on a custom graph.
Find the network address, broadcast address and usable IP range.
Convert decimal numbers to IEEE 754 binary32 or binary64 format.
Find Q1, Q2, Q3, IQR and outliers with a box-and-whisker diagram.
Find the area under the normal curve between any two values.
Calculate Pearson's r from two data sets with a scatter plot.
Calculate Poisson probabilities and plot the distribution.
Solve separable, linear, and homogeneous first-order ODEs with steps.
Find critical points and classify them using the first derivative test.
Differentiate implicit equations step by step with clear dy/dx notation.
Find interior and exterior angles for any regular polygon.
Calculate surface areas of all common 3D shapes with formulas.
Find distance, slope, midpoint and line equations in one tool.
Calculate the compass bearing between two map coordinates.
Calculate centripetal force, acceleration and orbital speed.
Find the buoyant force and determine if an object sinks or floats.
Solve the thin lens equation and draw the ray diagram.
Convert between decibels and sound intensity or pressure ratios.
Convert any time between time zones — compare multiple zones at once with correct DST handling and day-change indicators.
Convert text to binary, hex, or decimal bytes and back — full Unicode support, live in both directions.
Generate random numbers in any range — one or hundreds at once, with no-repeat mode, dice and coin presets, and secure randomness.
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Computezy is a free online calculator and tool hub built for students, professionals, and curious minds. Whether you need a math calculator for homework, a science calculator for lab work, a developer tool for debugging, or a finance calculator for budgeting, Computezy has a free, instant, browser-based solution ready the moment you land on the page — no account required, nothing to download.
The everyday tools cover the tasks most people reach for first: an online ruler that measures objects on your screen at their true physical size using your display's actual pixel density, an age calculator that gives your exact age in years, months, days, and hours, a word and character counter for hitting assignment limits, and a date difference calculator for counting business days between two dates. Every tool is free and runs entirely in your browser.
The algebra calculators and calculus tools go deeper: they show every step of the solution so you understand the method, not just copy the answer. Solve quadratic equations, factor polynomials, differentiate and integrate functions, evaluate limits, and find volumes of revolution — all with the working shown at each stage. The geometry and trigonometry calculators add interactive diagrams, and the statistics tools walk through hypothesis tests and distributions with clear formula breakdowns.
Science subjects are covered by dedicated calculator online sections for physics, astronomy, chemistry, and biology. The physics tools handle SUVAT kinematics, Ohm's law, projectile motion, and more. The astronomy tools put the cosmos in context — find your weight on other planets or calculate how a black hole's event horizon scales with mass. The chemistry section balances equations, calculates molar mass, and even lets you explore an interactive periodic table.
Developers get a full suite of developer tools: a JSON formatter and validator, JWT decoder, regex tester, Base64 encoder, UUID generator, SQL formatter, Markdown previewer, and more — all running client-side so your data never leaves the browser. The finance calculators cover compound interest, EMI, mortgage, SIP, and more with visual charts. The computer science section brings sorting algorithms, binary arithmetic, logic gates, and graph traversal to life with interactive animations. Every tool on Computezy is free, private, and instant — open any calculator and start working immediately.