Free Tools
A directory of free online calculators and utilities from our wider network. No sign-ups, no paywalls — just handy tools for everyday calculations, conversions and developer tasks. These open in a new tab.
Square Footage Calculator
Work out area in square feet for rooms, floors and projects.
thesquarefootagecalculator.comPercentage Calculator
Percent of a number, increases, decreases and differences.
bestpercentagecalculator.netAge Calculator
Calculate exact age in years, months and days from any date.
theagecalculator.netHours Calculator
Add up hours and minutes between times — timesheets and shifts.
calculatehours.netMargin vs Markup
Convert between profit margin and markup, and price products.
marginvsmarkup.comGirth Calculator
Calculate combined length-plus-girth for parcels and shipping.
girthcalculator.comBox Volume Calculator
Volume of a box from its dimensions, in your chosen units.
boxvolumecalculator.comDimensional Weight
Work out dimensional (volumetric) weight for couriers.
dimweightcalc.comEMI Calculator
Work out loan EMIs, total interest and repayment schedules.
indiaemi.comTotal Interest Calculator
See the total interest paid over the full life of a loan.
totalinterestcalc.comSIP Calculator
Project mutual fund SIP returns by rate, tenure and step-up.
sipcalculatorhub.comGPA Calculator
Calculate GPA and CGPA from grades and credit hours.
gpacalculatorhq.comCalorie Calculator
Estimate daily calorie needs, BMR and macros for your goals.
calorieskit.comBMI & BMR Calculator
Find body mass index and basal metabolic rate in seconds.
bmibmrcalc.comFraction Calculator
Add, subtract, multiply and divide fractions step by step.
fractionsteps.comVoltage Drop Calculator
Calculate voltage drop by wire gauge, length and current.
voltdropcalc.comAC Tonnage Calculator
Size an air conditioner in tons from room area and climate.
actonnagecalc.comBackup Power Calculator
Size a generator or battery backup by wattage and runtime.
backuppowercalc.comSolar Battery Bank Calculator
Size a solar battery bank by load, autonomy and discharge depth.
solarbatterybankcalc.comTank Volume Calculator
Volume and fill level of cylindrical, oval and rectangular tanks.
tankvolumecalc.comPool Volume Calculator
Pool water volume in gallons or litres for any shape and depth.
poolvolumecalc.comCubic Yardage Calculator
Cubic yards of concrete, gravel, mulch and soil for projects.
cubicyardage.comConcrete Material Calculator
Estimate concrete, cement, sand and aggregate for slabs.
concretematerialcalc.comRoofing Material Calculator
Estimate shingles and materials by roof area and pitch.
roofingmaterialcalc.comStair Calculator
Work out stair rise, run, stringer length and step count.
staircalculators.netConstruction Calculators
A hub of construction calculators for materials and estimates.
constructioncalchq.comUnit Cheat Sheet
Quick reference for unit conversions across measurement systems.
unitcheatsheet.comCase Converter
Change text between upper, lower, title, sentence and other cases.
transformcase.comWord Counter
Count words, characters, sentences and paragraphs in your text.
wordcounterfree.comText Repeater
Repeat any text or phrase a set number of times instantly.
textrepeat.netOnline Clock
Clock, time zones and simple time tools in your browser.
clockwithus.comCrontab Cheat Sheet
Build and decode cron schedule expressions with ease.
crontabsheet.comRegex Guide
Reference and helper for building regular expressions.
regexguide.comCooking Measurement Converter
Convert cups, grams, ounces and spoons for any recipe.
measurechef.comNumber to Words
Convert numbers to words for cheques, invoices and documents.
numtotext.comColor Code Kit
Pick and convert colours across HEX, RGB and HSL, and build palettes.
colorcodekit.comBase64 Encode / Decode
Encode text to Base64 or decode Base64 back to text.
base64decode.toolsURL Encode / Decode
Percent-encode or decode URLs and query strings.
urlencodedecode.comJSON Tools
Format, validate and minify JSON in your browser.
jsontools.toolsHash Generator
Generate MD5, SHA and other hashes from your input.
hashgenerator.toolsUUID Generator
Generate random UUIDs / GUIDs for development use.
uuidcore.comEpoch / Unix Time
Convert between Unix timestamps and human-readable dates.
epochtime.toolsPassword Strength
Check how strong a password is against common attacks.
passwordstrength.netRemove Metadata
Strip EXIF and other metadata from files for privacy.
removemetadata.toolsPicture Toolkit
Resize, convert and edit images online — a handy image kit.
pictoolkit.comPDF Tools
Merge, split, compress and convert PDF files in your browser.
corepdftools.comBarcode & QR Generator
Generate QR codes and barcodes for URLs, text and products.
barcodeandqr.comCIDR Calculator
Calculate IP ranges, hosts and blocks from CIDR notation.
cidrcalculator.netSubnet Mask Calculator
Work out subnet masks, ranges and host counts for networks.
subnetmaskcalc.netInternet Speed Test
Test your download, upload and ping speed in the browser.
checkinternetspeed.toolsWhat Is My IP
See your public IP address, location, ISP and browser details.
checkmyipnow.comWHOIS Lookup
Look up domain registration, ownership, expiry and DNS records.
whoislookuppro.com