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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.
ripe.net
ripe.net hosts RIPEstat, offering BGP AS Lookup and other network monitoring tools to help users analyze and understand the global Internet infrastructure.
rjl.io
Collection of free, privacy-focused developer tools designed to work without accounts or tracking. ([rjl.io](https://rjl.io/htaccess-generator/?utm_source=openai))
radformation.com
Radformation.com hosts tools for radiation safety and health professionals. The BED Calculator helps estimate bone marrow equivalent doses from exposure data.
rapidtoolsonline.com
Rapid Tools Online offers a toolbox of utilities and unit converters. ([rapidtoolsonline.com](https://www.rapidtoolsonline.com/unit-converters/prefixes-converter))
rapidtables.com
RapidTables.com hosts 518 tools for quick calculations and conversions, including a battery capacity calculator, lux to watts converter, millicandela to lumens converter, random number generator, AWG to mm converter, and date calculator.
ray.so
Ray.so by Raycast is a modern alternative to Carbon for creating beautiful code-snippet images with curated themes.
readycalculator.com
ReadyCalculator.com hosts a variety of practical tools to help with everyday tasks, including a Bathroom Mirror Size Calculator to determine optimal mirror dimensions for your space.
realtor.com
Realtor.com is a major real estate marketplace that also provides mortgage tools and resources. ([realtor.com](https://www.realtor.com/mortgage/?utm_source=openai))
bakingcalc.com
bakingcalc.com hosts a Baker's Percentage Calculator tool for bakers to accurately measure ingredients in recipes.
redcrab-software.com
Redcrab Software is a platform offering educational calculators for mathematics and science. Their sample tools include an Associative Property Calculator and a Bessel Function Calculator, designed to help users learn and solve complex problems in algebra and engineering.
regexr.com
RegExr is a long-running visual regular expression tester for JavaScript and PCRE flavours, with side-by-side reference and shareable patterns.
relahconvert.com
RelahConvert.com hosts File Converter Suite, a set of tools for converting files between various formats.
rheumcalc.com
RheumCalc is rheumcalc.com hosts a BASDAI Score Calculator tool to help healthcare providers assess the severity of rheumatoid arthritis in patients.
ritzelrechner.de
Ritzelrechner.de hosts a Bike Gear Calculator tool for determining optimal gear ratios based on bicycle specifications and riding conditions.
rootutils.com
RootUtils.com hosts a collection of useful tools for developers and tech enthusiasts, including a .gitignore Generator to help create configuration files for Git repositories.
runbikecalc.com
RunBikeCalc is a site where you can find bike cadence calculators and other cycling-related tools to help improve your riding experience.
ryanoconnellfinance.com
Ryan O'Connell Finance hosts an Asset Allocation Calculator & Visualizer to help users optimize their investment portfolios by balancing various asset classes.
sceditor.com
sceditor.com hosts a BBCode Editor tool, allowing users to create rich text content using simple BBCode syntax.
sqlnice.com
Browser-based SQL formatter with subquery recognition — no signup, no uploads.
ssllabs.com
Qualys SSL Labs runs a deep TLS/SSL configuration analysis on any web server, the gold-standard report for HTTPS security posture.
jakearchibald.github.io/svgomg
SVGOMG is Jake Archibald's web GUI for the SVGO optimiser — the standard tool for shrinking SVG files for production use.
safeaudiokit.com
safeaudiokit.com offers an Audio File Size Calculator tool to help determine the file size of audio files based on their length and bitrate.
sagecalculator.com
Sage Calculator is a website hosting several practical tools for everyday use. It offers an Ast Alt Ratio Calculator for astronomy enthusiasts, a Baby Formula Calculator for new parents, and a Baby's Milk Intake Calculator to help determine appropriate feeding amounts. The site provides quick access to these useful resources without requiring registration or subscription.
fabric-calculator.com
Sailrite’s long-running DIY sewing and upholstery calculator platform for planning fabric and supplies.
salary.com
Salary.com provides online salary calculators and compensation insights for job seekers. ([salary.com](https://www.salary.com/research/salary/?utm_source=openai))
satnow.com
SatNow is an engineering marketplace and knowledge platform with RF/satellite resources, calculators, and technical tools.
savvycalculator.com
Savvy Calculator is a site that offers handy tools for various calculations. One of its features includes a Baud Rate Calculator, which helps determine the number of bits transferred per second in digital communication systems.
schoolmykids.com
Educational site with learning resources and built-in calculators, including force unit conversion tools. ([schoolmykids.com](https://www.schoolmykids.com/learn/calculators/attonewton-to-femtonewton-conversion-force-converter-calculator?utm_source=openai))
securityheaders.com
Security Headers scans a site's HTTP response headers and assigns a letter-grade security score with detailed remediation guidance.
sendcutsend.com
SendCutSend.com hosts tools for engineering and manufacturing, including a Bend Allowance Calculator to help with metal forming calculations.
sensorsone.com
sensorsone.com hosts an online toolset for various unit conversions, including frequency (e.g., Attohertz to Hertz) and pressure (e.g., Bar to PSI). These utilities help with quick calculations across different scientific and engineering measurements.
shapesense.com
shapesense.com hosts a BAI Calculator to help assess body fat percentage based on weight and height measurements.
sheldonbrown.com
Sheldon Brown provides cycling-related tools like a bike gear calculator and speed calculator to help riders optimize their performance.
shields.io
Shields.io generates SVG status badges for README files — for build, version, license, downloads, and dozens of other endpoints.
simplecalculator.co
SimpleCalculator.co is a site that offers various calculators to simplify everyday math tasks. It includes an Average Rating Calculator to help find the mean of multiple numbers quickly and easily.
sixpacksmackdown.com
SixPackSmackdown.com hosts a Bench Press Pyramid Calculator tool designed to help fitness enthusiasts optimize their bench press routine for maximum strength gains.
skyciv.com
SkyCiv.com provides engineering and construction professionals with a suite of calculation tools for beams, including beam load, span, bending stress, and deflection calculators.
smart-calculators.net
Smart Calculators.net hosts a BMI Calculator to help users determine their body mass index based on weight and height.
smartasset.com
smartasset.com provides financial planning tools like an asset allocation planner calculator, banking cost analyzer tool, and bank fee comparison calculator to help users make informed decisions about their money.
smokedbbqsource.com
Smoked BBQ Source is a website that offers tools for anyone interested in smoking and grilling. It provides a Bacon Curing Calculator to help determine the right amount of time and salt needed to properly cure bacon at home.
socalculator.com
So Calculator is socalculator.com hosts an average fixed cost calculator and other business-related tools to help with financial calculations.
soberstandard.com
Sobriety-focused site with free tools and calculators for recovery and wellness. ([soberstandard.com](https://www.soberstandard.com/sobriety-tools-calculators/))
socscistatistics.com
Social Science Statistics is a resource for statisticians and researchers in social sciences, offering tools like Bayes' Theorem Calculator to assist with data analysis and probability calculations.
solutioinsilico.com
Solutio in silico is a platform providing various tools for genomic data analysis. It includes a BED Calculator to help with the conversion and manipulation of genomic intervals.
songguru.ai
SongGuru.ai Free Tools is a platform hosting BPM (beats per minute) calculators for musicians and producers to help in creating and mixing their tracks.
sonnysbbq.com
Sonny's BBQ provides online tools to help plan and organize barbecues effectively. Their BBQ Party Calculator helps estimate the number of guests and food requirements for a party.
sounddevices.com
Sound Devices is a professional audio equipment company that also provides support tools for recording workflows. ([sounddevices.com](https://www.sounddevices.com/audio-recording-calculator/))
sourdoughtalk.com
Sourdough Talk hosts a Baker's Percentage Calculator, helping bakers accurately measure ingredients for their recipes.
sourdough.guru
SourdoughGuru is a site providing tools for sourdough bakers, including a Baker's Percentage Calculator to help with recipe conversions and fermentation times.
sourdoughy.com
Sourdoughy.com hosts a Baker's Percentage Calculator tool to help bakers measure ingredients accurately for their sourdough bread recipes.
sfwmd.gov
South Florida Water Management District is the official government body overseeing water resources in South Florida. It provides tools to help residents manage water use efficiently, such as a Bath vs Shower Calculator to compare water consumption between bathtubs and showers.
swfwmd.state.fl.us
Southwest Florida Water Management District (WaterMatters) is a government site providing water conservation tools and information for residents of Southwest Florida. It offers a Bath vs Shower Calculator to help users compare water usage between baths and showers, promoting节水 practices.
southwire.com
southwire.com provides an online electrical converter tool for converting AWG to Amps, helping DIYers and professionals calculate electrical needs accurately.
sparkycalc.com
SparkyCalc.com hosts Battery Size Calculator, helping users determine appropriate battery sizes for various devices and applications.
speedguide.net
SpeedGuide.net hosts Bandwidth Delay Product Calculator to help users understand how network latency and bandwidth affect data transfer times.
spherion.com
Spherion provides a free salary comparison tool that benchmarks pay by job title and location. ([spherion.com](https://www.spherion.com/job-seekers/salary-comparison?utm_source=openai))
spondylitis.org
spondylitis.org provides resources and support for individuals with spondylitis, offering a BASDAI Score Calculator to help track disease activity.
sport-calculator.com
Sport Calculator is a website offering tools for sports enthusiasts to calculate and track performance metrics. It includes an Average Triathlon Finishing Time Calculator to help athletes analyze and improve their times across different races.
sportcalculators.com
sportcalculators.com hosts online calculators for various sports activities, including a Bike Cadence Calculator, Bike Pace Calculator, and Bike Cadence and Speed Calculator.
stlouischildrens.org
stlouischildrens.org hosts educational tools for parents and caregivers, including a Benadryl Dosage Calculator to help determine appropriate medication doses for children.