Free calculators and converters
This website contains a bunch of web-based tools (you don't need to install anything, just run them here) that I have developed through the years. Use them like you want (within reason) and if you really like them, let me know.
How could you use these tools?
Bash tools
Bash boilerplate
Create bash scripts fast with a slick boilerplate
Create bash scripts fast with a slick boilerplate
Calculator tools
Acceleration calculator
Convert m/s² into in/s², g
Convert m/s² into in/s², g
Battery calculator
What does the kWh of a battery mean?
What does the kWh of a battery mean?
Distance calculator
Speed x time → distance
Speed x time → distance
Electric Car calculator
How much $ does your electric car use in kWh per year?
How much $ does your electric car use in kWh per year?
Exponential growth
Exponential growth / logarithmic decay
Exponential growth / logarithmic decay
Fuel Cost calculator
How much $ does your car fuel cost per year?
How much $ does your car fuel cost per year?
Gladwell's 10000 hours
Deliberate practice according to Malcolm Gladwell
Deliberate practice according to Malcolm Gladwell
Speed converter
m/s ⇆ km/h, mph, mach
m/s ⇆ km/h, mph, mach
Frequency Calculator
Hertz -> wavelength, spectrum
Hertz -> wavelength, spectrum
Electrical power
Volt x Amp → Watt, kWh, Ah, Joule, calorie
Volt x Amp → Watt, kWh, Ah, Joule, calorie
Wavelength Calculator
Wavelength -> Hz, spectrum
Wavelength -> Hz, spectrum
Mortgage loan calculator
Calculate monthly payments for a mortgage loan
Calculate monthly payments for a mortgage loan
Color tools
CMYK conversion
CMYK ⇆ RGB, HSV, XYZ ...
CMYK ⇆ RGB, HSV, XYZ ...
HTML Color list
List of named HTML colors
List of named HTML colors
Pantone Color list
List of named Pantone colors
List of named Pantone colors
RGB conversion
RGB ⇆ CMYK, HSV, XYZ ...
RGB ⇆ CMYK, HSV, XYZ ...
Websafe Color list
List of websafe colors
List of websafe colors
Data tools
Bandwidth convert
Mbps ⇆ KB/s, GB/day, TB/week ...
Mbps ⇆ KB/s, GB/day, TB/week ...
Download calculator
file size & network speed ⇆ time to download
file size & network speed ⇆ time to download
Data size calculator
Calculate 10 Mbps x 6.5 hours = ? GB
Calculate 10 Mbps x 6.5 hours = ? GB
Music tools
Beats-per-minute
Convert BPM to Hz, bar length, fractions
Convert BPM to Hz, bar length, fractions
Audio delay
Calculate audio delay length in msec
Calculate audio delay length in msec
Music Frequency
Convert pitch to musical note and wavelength
Convert pitch to musical note and wavelength
Song length
Calculate song length from BPM
Calculate song length from BPM
Music Scale
Generate scales with frequencies
Generate scales with frequencies
Tap your tempo
Tap to find the BPM of a song or a heartbeat
Tap to find the BPM of a song or a heartbeat
Photo tools
Aspect ratio
Image Width x Height → aspect ratio
Image Width x Height → aspect ratio
Composition Calculator
Focal length, distance, crop factor → image composition
Focal length, distance, crop factor → image composition
Depth-of-Field Calculator
Aperture, focal length, subject distance, crop → depth-of-field
Aperture, focal length, subject distance, crop → depth-of-field
DPI calculator
Print Width x Height and dpi → megapixels
Print Width x Height and dpi → megapixels
Image filesize calculator
Image Width x Height JPG/RAW/PNG → bytes
Image Width x Height JPG/RAW/PNG → bytes
Light calculator (EV)
Aperture, shutter time, ISO → Exposure Value
Aperture, shutter time, ISO → Exposure Value
Megapixel calculator
Image Width x Height → megapixels
Image Width x Height → megapixels
Megapixel Aspects
See megapixels in different aspect ratios
See megapixels in different aspect ratios
Video tools
Audio file size calculator
Estimate audio file size for (un)compressed audio
Estimate audio file size for (un)compressed audio
Common bitrates
List of common video bitrates (Prores, DV, DCP, MPEG...)
List of common video bitrates (Prores, DV, DCP, MPEG...)
DCP file size
Calculate DCP audio and video filesizes
Calculate DCP audio and video filesizes
Foot-Lambert Calculator
Foot-Lambert Calculator for luminance of a screen
Foot-Lambert Calculator for luminance of a screen
Screen size
Calculate screen size from diagional and aspect ratio
Calculate screen size from diagional and aspect ratio
Video bitrate
Estimate video bitrate based on resolution, fps and bit depth
Estimate video bitrate based on resolution, fps and bit depth
Frame rate convert
Framerate conversion with ffmpeg and sox
Framerate conversion with ffmpeg and sox
Video file size calculator
Estimate video file size from resolution and duration
Estimate video file size from resolution and duration
Web tools
Content Security Policy
Create your Content Security Policy header fast!
Create your Content Security Policy header fast!
Redirection check
Is your site redirection correctly configured?
Is your site redirection correctly configured?
Security Policy Framework check
Is your SPF correctly configured?
Is your SPF correctly configured?
HTTPS config check
Is your site correctly configured for HTTPS?
Is your site correctly configured for HTTPS?
HTML char map
View all special HTML characters «»
View all special HTML characters «»
Emoji char map
View all special Unicode characters 🥠
View all special Unicode characters 🥠
HTML encoder
(HTML/URL) Encode text full of àçčéñtš
(HTML/URL) Encode text full of àçčéñtš
SEO Performance
Check your site on 10+ performance test sites
Check your site on 10+ performance test sites
About this site
Development blog
New tools and other announcements
New tools and other announcements
Contact
Remarks about this site? Let me know!
Remarks about this site? Let me know!
History
How toolstud.io grew since 2006 until now
How toolstud.io grew since 2006 until now
Privacy Statement
Privacy statement (GDPR compliant)
Privacy statement (GDPR compliant)
Terms & Conditions
Terms & conditions
Terms & conditions
How to use the tools
Show me how I can use these tools
Show me how I can use these tools
