The Free Tools Network
AudioTestHQ is one of 68 free tools by Sri Murugan Systems. Like this site, the other 67 run in your browser and need no sign-up.
Everyday math and measurement (8)
Square Footage Calculator
Area in square feet from dimensions.
thesquarefootagecalculator.comPercentage Calculator
Percentages, percent change and tip splits.
bestpercentagecalculator.netAge Calculator
Exact age from a date of birth.
theagecalculator.netFraction Calculator
Add, subtract and simplify fractions, with steps.
fractionsteps.comUnit Cheat Sheet
Engineering unit converter with reference tables.
unitcheatsheet.comNumber to Words
Numbers written out in words.
numtotext.comGPA Calculator
GPA and CGPA from grades and credits.
gpacalculatorhq.comTire Size Calculator
Compare two tire sizes: height, width, sidewall and speedometer error.
tiresizecalc.net
Shipping and packing (3)
Box Volume Calculator
Box volume from length, width and height.
boxvolumecalculator.comGirth Calculator
Parcel girth against carrier limits.
girthcalculator.comDIM Weight Calculator
Dimensional shipping weight for many carriers.
dimweightcalc.com
Home, construction and energy (14)
Concrete Calculator
Concrete volume and bags for slabs and footings.
concretematerialcalc.comRoofing Calculator
Shingles, underlayment and roofing materials.
roofingmaterialcalc.comStair Calculator
Stair rise, run and stringer sizes.
staircalculators.netConstruction Calculator
Estimators for common construction materials.
constructioncalchq.comCubic Yardage Calculator
Cubic yards of concrete, mulch, gravel and soil.
cubicyardage.comTank Volume Calculator
Tank volume and fill level.
tankvolumecalc.comPool Volume Calculator
Pool water volume in gallons or litres.
poolvolumecalc.comAC Tonnage Calculator
Size air-conditioning tonnage for a room or building.
actonnagecalc.comProSolarCalc
Solar sizing, payback, battery and incentive calculators.
prosolarcalc.comSolar Battery Bank Calculator
Size a battery bank for a solar or off-grid system.
solarbatterybankcalc.comBackup Power Calculator
Battery or generator runtime for your loads.
backuppowercalc.comVoltage Drop Calculator
Size wiring from the voltage drop over a cable run.
voltdropcalc.comUtility Rate Calculator
US electricity bills by utility, from each utility's own tariff.
utilityratecalc.comEB Bill Calculator
Indian electricity bills for every state, from official tariffs.
ebbillcalc.com
Money and finance (13)
Paycheck Calculator
US take-home pay after federal and state taxes.
paycheckcalchq.comSales Tax Calculator
Add or remove US sales tax and find your state's official rate.
salestaxcalchq.comCapital Gains Tax Calculator
US capital gains tax: federal rates, the 3.8% NIIT and state tax.
capitalgainshq.comTotal Interest Calculator
The total interest paid over a loan.
totalinterestcalc.comMargin vs Markup
Convert margin and markup, with break-even.
marginvsmarkup.comEMI Calculator
Loan EMI and the full amortisation schedule.
indiaemi.comSIP Calculator
Mutual fund SIP returns and maturity value.
sipcalculatorhub.comVA Disability Calculator
Combine VA disability ratings and see the monthly pay.
vadisabilitycalc.netBAH Rate Calculator
BAH rates for every duty station, plus military pay calculators.
bahratecalc.comCouncil Tax by Council
Council tax bands and charges for councils in England, Wales and Scotland.
counciltaxhq.co.ukLong Service Leave Calculator
Long service leave for every Australian state and territory.
longserviceleave.comBrutto-Netto-Rechner
Swiss gross-to-net salary for all 26 cantons (in German).
bruttonettorechner.chSkattekalkulator
Norwegian salary after tax, month by month (in Norwegian).
skattekalkulator.net
Health and lifestyle (4)
Calories Kit
Daily calorie needs, TDEE and macros.
calorieskit.comBMI and BMR Calculator
Body mass index and basal metabolic rate.
bmibmrcalc.comCooking Measure Converter
Cups, grams and ounces for recipes.
measurechef.comNumerology Calculator
Name and birth-date numbers in the Pythagorean and Chaldean systems.
numerologywise.com
Developer and networking (14)
JSON Tools
Format, validate, minify and convert JSON.
jsontools.toolsHash Generator
MD5, SHA and other hashes for text or files.
hashgenerator.toolsBase64 Decoder
Decode Base64, JWTs and certificates in the browser.
base64decode.toolsURL Encode/Decode
Percent-encoded text to and from plain text.
urlencodedecode.comUUID Core
Generate, validate and convert UUIDs.
uuidcore.comCrontab Sheet
Explain and build cron expressions.
crontabsheet.comRegex Guide
Explain, test and build regular expressions.
regexguide.comCIDR Calculator
IPv4 and IPv6 ranges and subnet boundaries.
cidrcalculator.netSubnet Mask Calculator
Subnet masks, host bits and address ranges.
subnetmaskcalc.netColor Code Kit
HEX, RGB and HSL colours and palettes.
colorcodekit.comEpoch Time
Unix timestamps to dates and back.
epochtime.toolsInternet Speed Test
Download, upload and latency.
checkinternetspeed.toolsWhat's My IP
Your public IP address and network details.
checkmyipnow.comWHOIS Lookup
Domain registration, owner and expiry records.
whoislookuppro.com
Text and writing (5)
Word Counter
Words, characters, sentences and reading time.
wordcounterfree.comTransform Case
Title, sentence and programming cases.
transformcase.comText Repeat
Repeat words or emoji with separators.
textrepeat.netPassword Strength
Test a password and make a stronger one.
passwordstrength.netWord Unscrambler
Unscramble letters into every word they make.
letterzy.com
Files, images and media (4)
PicToolkit
Compress, convert, resize and crop images locally.
pictoolkit.comRemove Metadata
Strip EXIF, GPS and hidden metadata.
removemetadata.toolsPDF Tools
Merge, split, compress and convert PDFs in the browser.
corepdftools.comBarcode and QR
QR codes and barcodes from text or data.
barcodeandqr.com
Time and scheduling (2)
Calculate Hours
Work hours, timesheets and overtime.
calculatehours.netClock With Us
Alarm clock, timer, stopwatch and world clock.
clockwithus.com