Free tools network
Free tools
A growing network of 52 free, no-signup tools and calculators — built the same way as this site: fast, private, and run entirely in your browser. Explore the rest of the network below.
Everyday calculators
thesquarefootagecalculator.comWork out square footage for rooms, walls, flooring and land in any unit. Handles rectangles, circles and irregular shapes, and converts between feet, inches, yards and meters.bestpercentagecalculator.netSolve every common percentage problem in one place — percentage of a number, percentage change, increase and decrease. Shows the working so you can check the math, not just the answer.theagecalculator.netFind an exact age in years, months, weeks and days from any birth date, plus the difference between any two dates. Useful for birthdays, milestones, eligibility dates and document deadlines.calculatehours.netAdd up worked hours and time spans across a day or week, with breaks, overtime and decimal-hour output. Built for timesheets, payroll and tracking billable time.clockwithus.comCompare the current time across cities and time zones at a glance. Handy for scheduling calls, coordinating remote teams and planning around daylight saving changes.unitcheatsheet.comFast, printable reference sheets for converting length, weight, volume, temperature and more. Skip the calculator when you just need the conversion factor at hand.calorieskit.comA full set of nutrition and body-metric calculators — calories, macros, BMI, body fat and protein targets. Designed to support healthy planning without accounts or tracking.bmibmrcalc.comCalculate body mass index and basal metabolic rate from height, weight, age and sex. Shows where you sit on the standard scale and the calories your body burns at rest as a planning baseline.fractionsteps.comAdd, subtract, multiply and divide fractions and mixed numbers with every step of the working shown. Built for homework, recipes and workshop measurements that refuse to become tidy decimals.gpacalculatorhq.comWork out grade point average and cumulative CGPA from letter grades and credit hours across common scales. Track where you stand and the marks you still need for a target.measurechef.comConvert cups, grams, ounces, millilitres and spoons for any recipe, ingredient by ingredient. Scale servings up or down and switch between metric and imperial without the kitchen guesswork.
Finance
marginvsmarkup.comConvert cleanly between profit margin and markup, the two figures retailers constantly confuse. Enter a cost and either value to see selling price, profit and the full pricing breakdown.indiaemi.comEMI and loan calculators tailored to Indian home, car, personal and credit-card borrowing, including GST and advance/arrears options. Shows the amortization schedule and total interest paid.totalinterestcalc.comSee the total interest you'll pay over the full life of a mortgage or loan, not just the monthly payment. Uses live reference rates and breaks down principal versus interest over time.sipcalculatorhub.comProject the maturity value of a mutual-fund SIP from your monthly contribution, expected return and tenure, with optional annual step-ups. See how compounding builds the corpus year by year.
Construction & engineering
dimweightcalc.comCalculate dimensional (volumetric) weight for FedEx, UPS, USPS and other carriers so you can predict billed shipping weight. Compares actual versus dimensional weight and applies each carrier's divisor.boxvolumecalculator.comFind the volume and capacity of a box or carton for shipping, storage and packing decisions. Works in metric and imperial and helps you compare box sizes quickly.girthcalculator.comMeasure parcel girth to check against carrier size limits before you ship, and body-girth measurements for fitness tracking. Flags when a package exceeds common length-plus-girth maximums.actonnagecalc.comSize an air conditioner by tonnage for a room or whole home, with separate logic for US and Indian climates. Factors in area, sun exposure, occupancy and insulation for a realistic estimate.voltdropcalc.comCalculate voltage drop across a wire run to NEC and international standards, and check whether a conductor size is adequate. Built for electricians, inspectors and engineers sizing circuits.prosolarcalc.comPlan a solar installation by sizing panels, batteries, inverters and expected output. Helps estimate system capacity and energy production before committing to a design.tankvolumecalc.comCalculate the volume and fill level of cylindrical, rectangular, oval and capsule tanks in any unit. Useful for water storage, fuel, aquariums and process vessels where you need exact capacity.poolvolumecalc.comFind the water volume of a swimming pool in gallons or litres for rectangular, round, oval and irregular shapes. The number behind dosing chemicals, sizing a heater and estimating refills.staircalculators.netWork out stair rise, run, stringer length and step count to meet building-code comfort and safety limits. Plan a safe staircase precisely before any timber is cut.concretematerialcalc.comEstimate the concrete, cement, sand and aggregate needed for slabs, footings and columns, with the mix ratio. Plan a pour and buy the correct number of bags without over-ordering.roofingmaterialcalc.comEstimate shingles, underlayment and materials from your roof's area and pitch, with waste factored in. Budget a re-roof accurately and cut the leftover bundles you would otherwise pay for.constructioncalchq.comA hub of construction calculators covering materials, areas, volumes and project estimates in one place. The everyday jobsite math that builders and serious DIYers reach for repeatedly.solarbatterybankcalc.comSize a solar battery bank from daily energy use, days of autonomy and depth of discharge. The storage math that decides whether an off-grid or backup system lasts through the night.backuppowercalc.comSize a generator or battery backup from the combined wattage of your appliances and how long you need them. Plan for outages without buying far more capacity than you'll use.
Developer tools
base64decode.toolsEncode and decode Base64 for text and files entirely in your browser, with nothing uploaded. Useful for data URIs, debugging APIs and inspecting encoded payloads.urlencodedecode.comPercent-encode and decode URLs, query strings and individual parameters safely. Handles reserved characters and Unicode so links and API calls don't break.jsontools.toolsFormat, validate, repair and explore JSON with a tree view and clear error reporting. Fixes common syntax problems and makes large payloads readable.hashgenerator.toolsGenerate MD5, SHA-1, SHA-256 and other hashes from text or files for checksums and integrity checks. Runs locally so sensitive input never leaves your machine.uuidcore.comGenerate and validate UUIDs singly or in bulk, across versions, for databases, keys and test data. Copy-ready output for developers who need identifiers fast.epochtime.toolsConvert between Unix timestamps and human-readable dates in any time zone, both directions. Indispensable for debugging logs, APIs and scheduled jobs.regexguide.comBuild, test and learn regular expressions with live matching and a built-in reference. Explains each token so you understand the pattern, not just copy it.crontabsheet.comBuild and decode crontab schedule expressions in plain English so cron jobs run when you intend. Includes a quick-reference cheat sheet for the fields and syntax.
Text tools
wordcounterfree.comCount words, characters, sentences, paragraphs and estimated reading time as you type. Handy for essays, articles, social posts and meeting any length limit.textrepeat.netRepeat or duplicate a word, line or block of text any number of times with custom separators. Saves tedious copy-pasting when generating lists or test content.transformcase.comConvert text between upper, lower, title, sentence, camel and snake case instantly. A set of extra text utilities rounds out everyday formatting tasks.passwordstrength.netCheck how strong a password is and learn what makes it weak, all locally in your browser. Offers practical tips for building passwords that resist guessing and cracking.numtotext.comConvert numbers into their written-out words for cheques, invoices, contracts and legal documents. Handles currency formatting and very large figures so the words always match the digits.
Files, media & network
colorcodekit.comConvert colors between HEX, RGB, HSL and more, and build palettes, gradients and named-color references. A complete toolkit for designers and developers working with color.pictoolkit.comResize, convert, compress and edit images right in the browser without uploading them. Quick fixes for photos and graphics with no software to install.corepdftools.comPrivacy-first PDF tools to merge, split, compress and convert documents entirely client-side. Your files stay on your device — nothing is sent to a server.removemetadata.toolsStrip hidden metadata such as EXIF, author and location from images, PDFs, Office and media files. Protects your privacy before you share or publish a file.barcodeandqr.comGenerate barcodes and QR codes in common formats with print-ready, downloadable output. Suitable for labels, inventory, products and links.cidrcalculator.netPlan IP networks with CIDR notation — work out address ranges, host counts and subnet boundaries. Built for network engineers and anyone learning subnetting.subnetmaskcalc.netCalculate subnet masks, usable host counts, network and broadcast addresses from any IP and prefix. A fast reference for designing and troubleshooting networks.checkinternetspeed.toolsMeasure your download, upload and ping speed straight in the browser, with a clear read on latency and throughput. A fast way to check whether a connection is performing as it should.checkmyipnow.comSee your public IP address along with the location, ISP and browser details any website can detect. Handy for troubleshooting connections, confirming a VPN and setting up remote access.whoislookuppro.comLook up domain registration, ownership, expiry dates and DNS records for any website. Useful for buying domains, tracking your own renewals and researching who is behind a site.