Network
Free tools network
A network of 46+ free, browser-based calculators and utilities from the same team. Every tool runs client-side, with no signup and nothing stored on a server.
Roofing, construction & measurement
staircalculators.netDesign code-compliant stairs — rise, run, stringer length, headroom and total run — for interior, deck and basement stairs, with the geometry worked out for you.concretematerialcalc.comEstimate concrete volume and the bags or ready-mix loads needed for slabs, footings, columns and walls, with a waste margin built in.cubicyardage.comConcrete and bulk-material calculators that work the way contractors do, in cubic yards, for slabs, footings, columns, walls and stairs, with bag counts and a waste margin.thesquarefootagecalculator.comMeasure square footage for floors, walls, rooms and land across many shapes including rectangles, triangles, circles and irregular layouts, with unit conversion handled for you.boxvolumecalculator.comCalculate the volume and capacity of boxes, cartons and rectangular containers in any units, useful for packing, shipping and storage planning.tankvolumecalc.comFind the volume and fill level of tanks in many shapes — cylindrical, oval, rectangular and capsule, horizontal or vertical — for water, fuel and chemical storage.dimweightcalc.comCompute dimensional (volumetric) weight for FedEx, UPS, USPS and other carriers and compare it against actual weight, so you can predict shipping charges before you ship.girthcalculator.comMeasure a package's girth and combined length-plus-girth and check it against carrier oversize limits before you pay for shipping.
Solar, electrical & energy
voltdropcalc.comCalculate voltage drop and the correct wire gauge for any DC or AC run across NEC, CEC, BS 7671, AS/NZS and IEC standards.prosolarcalc.toolsA set of professional solar sizing and design tools for installers and serious DIY builders, covering the calculations behind planning a photovoltaic system.solarbatterybankcalc.comOff-grid and backup solar battery sizing done with real engineering — usable capacity, C-rate, voltage and chemistry — not sales-tool shortcuts.backuppowercalc.comSize a backup generator or power station accurately, accounting for surge loads as well as running watts, so the unit actually carries what you need.actonnagecalc.comWork out the air-conditioner tonnage and cooling load a room or whole home needs, based on area, climate, insulation and sun exposure.
Finance & business
totalinterestcalc.comSee the full lifetime cost of a mortgage or loan — total interest, amortization schedule and the effect of extra payments.indiaemi.comAn EMI calculator built for India, covering home, car and personal loans plus credit-card EMI plans with GST.marginvsmarkup.comConvert between margin and markup and price products correctly, clearing up the common confusion that quietly erodes profit.bestpercentagecalculator.netHandle every kind of everyday percentage problem — percentage of a number, change, increase, decrease and reverse percentages — in one clear tool.sipcalculatorhub.comProject the growth of systematic investment plans and lump-sum investments, with returns, maturity value and contribution breakdowns.
Developer & web utilities
jsontools.toolsFormat, validate, minify and explore JSON in your browser, with a tree viewer that makes large or messy payloads easy to read and debug.base64decode.toolsEncode text and files to Base64 or decode them back, entirely client-side so nothing you paste ever leaves your machine.urlencodedecode.comPercent-encode and decode URLs and query strings so special characters are transmitted safely, with full Unicode support.hashgenerator.toolsGenerate MD5, SHA-1, SHA-256 and other cryptographic hashes from text or files for checksums, integrity checks and fingerprinting.uuidcore.comGenerate UUIDs in bulk and learn how the different versions work, with copy-ready output for development and testing.regexguide.comBuild, test and understand regular expressions with live matching and a reference that explains each token in plain language.crontabsheet.comBuild cron schedules visually and read back exactly when a crontab expression will run, with a cheat sheet of common patterns.epochtime.toolsConvert between Unix epoch timestamps and human-readable dates in any time zone, in seconds or milliseconds, in both directions.cidrcalculator.netWork out network and broadcast addresses, host ranges and subnet sizes from CIDR notation, with clear breakdowns for network planning.subnetmaskcalc.netCalculate subnet masks, host counts and address ranges, with worked examples and code snippets in several languages for network engineers.barcodeandqr.comGenerate barcodes and QR codes in many formats and export them print-ready as PNG or PDF, all rendered locally in your browser.removemetadata.toolsStrip hidden metadata — EXIF, location, author and more — from images, PDFs, Office files, audio and video entirely in your browser.corepdftools.comMerge, split, compress, rotate and password-protect PDF files client-side, keeping your documents private because they never leave your device.colorcodekit.comConvert color codes between HEX, RGB, HSL and more, build palettes and gradients, and export tokens for SwiftUI, Flutter and Jetpack Compose.pictoolkit.comA toolkit of browser-based image utilities for resizing, converting and editing pictures without uploading them anywhere.
Text & time
wordcounterfree.comCount words, characters, sentences and paragraphs and estimate reading time as you type, useful for essays, articles and content limits.transformcase.comConvert text between upper case, lower case, title case, sentence case and more in one click, handy for cleaning up copy and code.textrepeat.netRepeat, duplicate and generate blocks of text quickly, with control over separators and counts for testing and formatting.numtotext.comConvert numbers to words, including Indian rupee amounts in words, for cheques, invoices and legal documents.unitcheatsheet.comA fast reference and converter for units of length, weight, volume, temperature and more, with the common conversions you actually look up.calculatehours.netAdd up the hours between start and end times, including overnight spans and breaks, useful for timesheets, shifts and payroll.clockwithus.comCheck the current time across world cities and time zones at a glance, for scheduling calls and coordinating across regions.theagecalculator.netCalculate exact age in years, months and days, plus milestones, birthday countdowns and age comparisons between people.passwordstrength.netTest how strong a password is and how long it would take to crack, with practical guidance, checked locally and never sent anywhere.
Health, education & everyday
calorieskit.comA suite of calorie, macronutrient and body-composition calculators — daily calorie needs, protein targets, lean body mass and more.bmibmrcalc.comCalculate BMI and BMR alongside daily energy needs and goal planning, with the methodology shown behind every number.fractionsteps.comSolve and learn fractions step by step — add, subtract, multiply, divide, simplify and compare — built for students and teachers.measurechef.comKitchen measurement and recipe calculators — scale recipes, convert cups to grams, and handle oven and ingredient conversions.
These are sites in our own network, linked openly with rel="nofollow noopener". We link them because they are built to the same standard, not as paid placements.