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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.
apps.engineeringtoolbox.com
Engineering ToolBox is a long-running engineering reference site with calculators, data tables, and technical guides. Its app subdomain hosts quick browser-based calculation tools.
envlock.io
Env Lock.io provides a .env file generator tool to help manage environment variables securely and easily across different development environments.
eontools.com
Eon Tools is a site offering various financial calculators, including an Average Variable Cost Calculator, to help users make informed decisions about their expenses and productivity.
equalsmoney.com
Equals Money is a resource for financial calculations, offering a Basis Point Calculator to help with percentage conversions in finance.
everydaycalculator.net
Everyday Calculators.net hosts simple calculators for everyday use, such as a Bedridden Patient Height Calculator to assist with daily living needs.
everydayconverters.com
EverydayConverters.com hosts Base64 to Octal converter and offers a variety of online tools for unit conversion, data encoding, and more.
evite.com
Evite.com hosts tools to organize social gatherings and events. Their Beer Pong Calculator helps plan and manage beer pong tournaments efficiently.
exchange-rates.org
Exchange-Rates.org publishes live currency rates and conversion tools for major world currencies. ([exchange-rates.org](https://www.exchange-rates.org/converter/aud-nzd?utm_source=openai))
experian.com
experian.com hosts various financial tools to help users manage their credit scores and make informed decisions, including an Auto Lease Calculator.
eyecalculator.com
EyeCalculator is a site that provides tools for parents and caregivers. It includes a Baby Eye Color Calculator to help predict eye color combinations in newborns based on their parents' eye colors.
ezgif.com
Ezgif is a long-running free online GIF maker and editor with broad coverage of animation tools — GIF creation, optimisation, conversion between video and image formats, and lightweight video editing.
freeandclear.com
freeandclear.com hosts a suite of practical financial calculators designed to help users manage their money effectively. One featured tool is the Bi-Weekly Mortgage Payment Calculator, which helps homeowners understand how switching to bi-weekly payments can reduce mortgage interest and save money over the long term.
fairviewmicrowave.com
fairviewmicrowave.com hosts educational RF design tools, including a Balanced Attenuator Calculator, to help professionals and students design radio frequency circuits accurately.
feedmyguests.com
FeedMyGuests.com hosts tools to help with planning and organizing events for guests, such as a BBQ Party Calculator to estimate food and supplies needed.
ferty9.com
ferty9.com hosts useful health calculators including a Period Calculator and a Pregnancy Due Date Calculator. These tools assist with tracking menstrual cycles and estimating pregnancy timelines.
figma.com
Figma Colors is figma.com's collection of color palettes and design resources for users to enhance their visual projects.
financialtoolset.com
Financial Toolset.com hosts 475 financial planning and management tools. Calculate bank fees, convert savings units, maximize cashback, optimize credit card rewards, estimate high-yield savings impact, and avoid overdraft fees with its comprehensive suite of calculators.
fincent.com
Fincent is a finance-focused website offering various tools to help manage personal and business finances effectively. One of its sample tools is an Average Fixed Cost Calculator, which assists in determining the average cost per unit of production over time.
finder.com
Finder.com hosts Bank Fee Comparison Calculator - Find the Best Account and similar tools to help users compare financial options.
finlytics.org
Finlytics.org hosts financial planning tools, including an Asset Allocation Calculator & Visualizer to help users optimize their investment portfolios.
fnbo.com
fnbo.com provides financial calculators and tools to help with various aspects of personal finance. The Back to School Calculator is an example of the kind of resource available on the site.
fitliferegime.com
Fit Life Regime is a fitness website offering a Bench Press Pyramid Calculator to help users calculate optimal bench press sets and reps for their training regimen.
fitbaseline.com
Fitbaseline.com hosts a Baseline Grid Calculator tool to help designers create visually balanced layouts.
flattools.com
FlatTools.com hosts two useful battery-related tools: a Battery Charge Time Calculator to estimate how long it will take for a device's battery to charge fully, and a Battery Charge Manager to help optimize charging habits for longer-lasting battery life.
fontjoy.com
Fontjoy is a free tool for discovering harmonious font pairings using deep-learning-assisted matching across Google Fonts.
footprinthero.com
Footprint Hero is a website providing practical tools for daily life, including a Battery Capacity Calculator to help estimate how long your device will last on a single charge.
foreach.id
ForEach.id hosts unit conversion tools for various measurements, including a Barrel Per Minute to Lpm converter.
forbes.com
Forbes Advisor publishes personal finance guidance and tools, including currency converters. ([forbes.com](https://www.forbes.com/advisor/money-transfer/currency-converter/aud-cad/?utm_source=openai))
fotor.com
fotor.com hosts online tools for graphic design and creation, including a banner size calculator to help determine optimal dimensions for website headers and banners.
freeonlinecalc.com
Free Online Calc is a site that hosts calculators for various statistical distributions, including the Beta Distribution Calculator. It offers tools to help users perform calculations and understand data analysis concepts.
freecodeformat.com
FreeCodeFormat.com hosts several handy online tools for web developers and enthusiasts. It offers a BBCode Viewer to preview how BBCode formatted text will appear on websites, a BBCode Editor to create and edit BBCode content, and a Base64 to Hexadecimal converter to convert between these two encoding formats.
freeconvert.com
FreeConvert is a file conversion service covering video, audio, image, document, ebook, and archive formats, with a generous free tier limited only by file size.
freeformatter.com
FreeFormatter is a free toolbox of 40+ developer utilities — formatters, validators, converters, encoders, minifiers, and string escapers — covering JSON, XML, HTML, CSS, SQL, YAML, JavaScript, and more.
freereicalc.com
FreePropertyCalc is a real-estate focused calculator site aimed at homebuyers and investors. ([freereicalc.com](https://freereicalc.com/?utm_source=openai))
freesmartcalculator.com
FreeSmartCalculator.com provides an array of handy calculators for various needs, including audio file size calculation, average triathlon finishing time, BC to AD date conversion, batting strike rate, Bertrand's paradox exploration, and bicarbonate deficit assessment, among others.
fundsindia.com
Investment platform for mutual funds and other financial products with planning content and calculators. The site provides retirement-related tools and explanations. ([fundsindia.com](https://www.fundsindia.com/apy-calculator?utm_source=openai))
fussfreebrowserapps.com
Fuss-Free Browser Apps hosts simple, offline-capable tools that run in your browser. ([fussfreebrowserapps.com](https://fussfreebrowserapps.com/audio-duration-filesize-calculator.html))
gihep.com
GI Hep provides clinical calculators and hepatology-focused reference tools intended for quick medical calculations. ([gihep.com](https://gihep.com/calc_astalt.php?utm_source=openai))
gigacalculator.com
GIGAcalculator.com provides a range of calculators for various financial and statistical needs, including an Average Percentage Calculator and an Average Return Calculator to help users with their calculations.
gpsvisualizer.com
GPS Visualizer is an online tool for visualizing GPS data and calculating distances between points. It offers a Bearing Calculator to determine the direction from one point to another.
gtmetrix.com
GTmetrix benchmarks website performance from multiple test locations and reports Web Vitals, page details, and waterfall data.
gearfinder.cc
Gearfinder.cc hosts online tools for cyclists, offering calculators like a Bike Cadence and Speed Calculator, as well as a Bike Gear Calculator to help with gear selection.
geeksforgeeks.org
GeeksforGeeks Utilities hosts useful online tools for developers and tech enthusiasts. One featured tool converts Base64 to XML, demonstrating its functionality in data transformation tasks.
geogebra.org
GeoGebra is a suite of free interactive math tools spanning algebra, geometry, calculus, statistics, and CAS — used widely in classrooms from middle school through university.
mysterytoolbox.organisingchaos.com
Geocaching Mystery Toolbox is a domain hosting various tools for solving puzzles and challenges, including the Beaufort Cipher, which aids in decoding messages using wind direction information.
getrandomgenerator.com
Get Random Generator is a directory hosting various random generators for users to generate numbers, words, colors, and other random data.
globalrph.com
GlobalRPH is a long-running clinical reference site with drug information, dosing resources, and medical calculators used by healthcare professionals.
goallcalculator.com
Go All Calculator is goallcalculator.com hosts calculators to help you assess environmental impacts and economic sustainability, such as the Atom Economy Calculator and Bag Footprint Calculator.
godigit.com
Insurance company with consumer finance guides and calculators for pensions and policies. It offers informational tools for retirement planning. ([godigit.com](https://www.godigit.com/finance/atal-pension-yojana-scheme/atal-pension-yojana-calculator?utm_source=openai))
gowebtool.com
GoWebTool.com hosts a collection of online tools, including a Barrel Wine to Liters Converter for easy unit conversions.
goodcalculators.com
GoodCalculators.com hosts a variety of calculators to simplify complex mathematical tasks, including the Balloon Payment Calculator for financial planning.
gridlover.net
Gridlover.net hosts a Baseline Grid Calculator tool for designers and developers to create responsive layouts based on a 12-column grid system.
guidecalculator.com
General-purpose calculator directory offering free online tools across many categories such as chemistry, finance, and health. ([guidecalculator.com](https://guidecalculator.com/))
guitarchalk.com
guitarchalk.com hosts BPM Calculator to help musicians determine the beats per minute for their songs.
hdfcbank.com
HDFC Bank is an Indian banking and financial services company. It provides a Bike EMI Calculator to help customers estimate their monthly installment payments for purchasing a bike.
hsh.com
HSH.com hosts financial tools for homeowners. Bi-weekly mortgage payment calculator is among its offerings to help manage home loans effectively.
htmlcolorcodes.com
htmlcolorcodes.com provides a simple tool to find and use HTML color codes, including a sample for beige.
happyhues.co
Happy Hues is a curated colour-palette inspiration site, showing palettes applied to a real interface for context.
health.harvard.edu
health.harvard.edu hosts a collection of health-focused tools designed to help users manage their well-being and make informed decisions about their health. Their BMI calculators provide a quick way for individuals to assess their body mass index, a key indicator of overall health.
healthcalculatoronline.com
Health Calculator Online is healthcalculatoronline.com hosts various online calculators designed to help users make informed decisions about their health and nutrition. Their Baby Formula Calculator allows parents to quickly determine the right amount of formula for their baby based on age and weight.