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Tools in this directory come from 658+ source sites — from established names like Calculator.net and Omni Calculator to specialised single-purpose tools.
unitjuggler.com
UnitJuggler.com hosts a collection of unit conversion tools for various physical quantities, including energy (Barrel of Oil Equivalent to Joules), pressure (Atmospheres to PSI Pressure Converter), radiation (Becquerel to Curie Radiation Converter), distance (Astronomical Unit Calculator), and volume (Barrels to Liters Volume Converter).
unitarium.com
Online unit conversion calculators covering metric, imperial, nautical, and astronomical measurements. ([unitarium.com](https://www.unitarium.com/length))
unitsconverter.io
UnitsConverter.io provides unit conversion tools and reference information across categories like weight. ([unitsconverter.io](https://unitsconverter.io/convert/weight/atomic-mass-unit-to-kilogram/))
unitsconverters.com
UnitsConverters.com hosts a suite of 7 conversion tools for various units of measurement, including pressure (Atmospheres to PSI), volume flow rate (Barrel Per Minute to Lpm), mass (Atomic Mass Units to Kilograms), force (Attownewton to Fn), and distance (Barleycorn to Millimeters).
colorado.edu
University of Colorado Boulder (Vaccine Simulator) hosts educational tools to help users understand and explore complex issues related to vaccines, including a Biden's Vaccine Plan Calculator to simulate different vaccination strategies.
homepage.divms.uiowa.edu
homepage.divms.uiowa.edu hosts a variety of probability calculators for statistical analysis, including a Beta Distribution Calculator to help with statistical inference and hypothesis testing.
unixtimestamp.com
UnixTimestamp.com generates and converts Unix epoch timestamps in seconds and milliseconds.
usefuldevtools.com
Useful DevTools is a resource for parents and pet owners, offering practical tools like a Benadryl dosage calculator for dogs to help manage their children's health safely.
utilitiesbunker.com
Utilities Bunker offers free online utilities and electronics calculation tools. The dB calculator page provides multiple modes including voltage ratio conversions. ([utilitiesbunker.com](https://www.utilitiesbunker.com/modules/electronics/db-calc.php))
vdo.ninja
VDO.Ninja hosts a collection of handy online tools to simplify web development tasks. Their Base64 to CSS converter is just one example of how they assist users in creating and manipulating stylesheets more efficiently.
covid19vaccineallocation.org
covid19vaccineallocation.org hosts Vaccine Allocation Planner (Ariadne Labs + Surgo), providing a tool like Biden’s Vaccine Plan Calculator to help understand and plan vaccine distribution strategies during the COVID-19 pandemic.
valoremfirst.com
Valorem Reply is a platform hosting various tools to enhance productivity and efficiency. One of its offerings is the Backup Recovery Time Calculator, which helps users estimate how long it will take to recover their data in case of a backup failure.
valuta.exchange
Valuta Exchange is a currency data site with real-time exchange rates and conversion calculators. It includes tools for comparing rates across amounts.
valutafx.com
ValutaFX provides foreign exchange rate data, historical charts, and currency conversion tools. The site focuses on exchange-rate information and related guidance.
vanguard.com.au
Vanguard’s insights site with investor education content and tools such as the Asset Class Tool. ([insights.vanguard.com.au](https://insights.vanguard.com.au/static/asset-class/app.html?utm_source=openai))
venngage.com
Venngage.com hosts a bar graph maker, allowing users to easily create visual representations of data with customizable options for colors and labels.
venom-powersports.com
Venom Powersports provides financing-related resources for powersports purchases. The financing section includes tools intended to help shoppers plan payments. ([venom-powersports.com](https://venom-powersports.com/financing-calculator))
versapay.com
Versapay.com provides financial management tools for businesses, including an Average Collection Period Calculator to help track payment timelines.
visual-paradigm.com
Visual Paradigm Online hosts an average rating calculator tool to help users assess the quality of various options based on user ratings and reviews.
voicedeck.io
VoiceDeck is an AI-powered audio review and delivery platform for voice production teams. ([voicedeck.io](https://voicedeck.io/tools/sample-rate-converter/))
wallaceracing.com
Wallace Racing is a site dedicated to motorsport enthusiasts, offering tools like the BSFC Calculator to help with engine performance analysis.
wallethub.com
WalletHub is wallethub.com hosts various financial tools to help users analyze banking costs and compare fees between different accounts.
watercalculator.org
Water Footprint Calculator (EcoRise) is a domain hosting various water usage calculators. The site offers a Bath vs Shower Calculator to compare the water consumption of different bathing methods.
web.archive.org
The Internet Archive's Wayback Machine lets you view historical snapshots of any web page — over 800 billion pages archived since 1996.
webtoolplus.com
Web Tool Plus is a site that offers various useful online tools to help with tasks like encoding and decoding Base64 data.
webmd.com
WebMD.com hosts useful health and wellness tools like BMI calculators for teens and adults to help manage weight and overall wellbeing.
webthemez.com
WebThemez Tools is webthemez.com's resource for handy online utilities. It offers a suite of tools like BBCode Viewer and Base64 to XML converter to help with various tasks efficiently.
webutility.io
WebUtility.io is a platform hosting various online utilities and tools for web developers and designers. It offers a Babel Formatter to help with JavaScript code transformation between different versions.
wellcalculate.com
WellCalculate.com hosts useful calculators including a Velocity Calculator and a D&D 5e HP Calculator, offering quick calculations for various needs.
whenmybaby.com
WhenMyBaby.com hosts BBT Calculator and Basal Body Temperature tracking tools to help users monitor their fertility and track ovulation.
wise.com
Wise provides international money services and a public currency converter with mid-market rates and historical charts. ([wise.com](https://wise.com/us/currency-converter/aud-to-nzd-rate?utm_source=openai))
wonsulting.com
Wonsulting (ResumAI) is a platform for AI-driven tools designed to enhance productivity and decision-making processes. Their sample tool, Before/After Transformer, offers users an interactive way to compare and analyze data visually.
gold.org
World Gold Council offers research and tools for portfolio analysis that include gold as an asset class. ([gold.org](https://www.gold.org/goldhub/portfolio-tools/simulator?utm_source=openai))
worldtimebuddy.com
worldtimebuddy.com hosts a time zone converter tool that allows users to check the current time in different parts of the world, such as Bangkok's current time now.
worldtimeserver.com
WorldTimeServer.com hosts a suite of time-related tools, offering current timestamps and time zone conversions for various locations around the world. Examples include showing BST time now and Bangkok time now.
wutools.com
WuTools is a website that offers various useful tools for users. One of its sample tools is an Audio Sample Rate Frequency Converter, which allows you to change the sample rate and frequency of audio files.
wurkn.com
HR-focused site that provides a free attrition calculator for estimating turnover impacts. ([wurkn.com](https://wurkn.com/attrition-calculator/?utm_source=openai))
wysibb.com
WysiBB is a long-running WYSIWYG BBCode editor project designed for forums and web apps.
x-rates.com
X-Rates provides exchange rate tools including calculators, tables, and charts for major currency pairs. ([x-rates.com](https://www.x-rates.com/calculator/?amount=1&from=AUD&to=NZD&utm_source=openai))
xconvert.com
XConvert is a multi-format file conversion service covering images, video, audio, PDFs, and developer-friendly utilities like hash and base conversion.
yangtool.com
yangtool.com hosts Bend Allowance Calculator, a practical tool for engineers and fabricators to calculate bend allowance in metal sheets.
yescalculator.com
yescalculator.com hosts a Bearing to Azimuth Angle Converter tool for converting bearing angles to azimuth angles in navigation and surveying.
zamzar.com
Zamzar.com hosts online file conversion tools, allowing users to transform various formats like BMP to PNG easily without downloading software.
zigwheels.com
ZigWheels.com hosts a Bike EMI Calculator tool to help you estimate your monthly bike loan payments based on various factors like interest rate and tenure.
acalculator.org
acalculator.org is an online resource for financial calculations, offering a Basis Point Calculator to help with percentage-based measurements in finance.
babymed.com
babymed.com hosts Baby Eye Color Calculator, a tool for predicting the color of a baby's eyes based on parents' eye colors.
buyupside.com
buyupside.com hosts tools for investors and traders, including a Beta Stock Calculator to measure volatility relative to the market.
dcode.fr
dcode.fr hosts 4 versatile tools including Base64 to Hexadecimal, Beaufort Cipher, Atbash Cipher, and Base64 to ASCII, offering users quick access to a wide range of encoding and decoding functions.
dbxpro.com
dbx Professional Audio provides system design tools and calculators for audio and electrical engineering tasks. The site includes a calculators page for common dB and voltage computations. ([dbxpro.com](https://dbxpro.com/en/tools/calculators))
everythingrf.com
everything RF is a domain providing resources and tools for RF design and engineering. The site hosts calculators like the Balanced Attenuator Calculator to assist in RF signal analysis and component design.
ezyzip.com
ezyZip provides free, in-browser file conversion tools for audio and other formats. ([ezyzip.com](https://www.ezyzip.com/convert-mp3-to-44.1kHz-online.html))
icalculator.com
Large calculator site with dedicated human resource calculators. ([human-resource.icalculator.com](https://human-resource.icalculator.com/turnover-rate-calculator.html?utm_source=openai))
iloveimg.com
iLoveIMG is a free online image editor toolbox covering compression, resizing, conversion, watermarking, background removal, and creative editing.
iuvotech.com
iuvotech.com hosts Backup Recovery Time Calculator, a tool to estimate how long it will take to recover data after a backup failure.
regex101.com
regex101 is the de-facto standard online regular expression tester for PCRE, JavaScript, Python, Go, Java, .NET, and Rust flavours.
unit-converter.org
Unit conversion site that provides conversions across length units, including astronomical measures. ([unit-converter.org](https://unit-converter.org/en/length/au.html?utm_source=openai))
wee.tools
Wee.tools hosts BUN Creatinine Ratio Calculator, a tool for estimating glomerular filtration rate in patients with kidney disease.
x-engineer.org
x-engineer.org hosts a BSFC Calculator to help engineers and mechanics measure brake specific fuel consumption for vehicle performance analysis.