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.
Bandwidth converter
Mbps ⇆ KB/s, GB/day, TB/week ...
Data size calculator
Calculate 10 Mbps x 6.5 hours = ? GB
Cloud Storage Cost
Calculate storage cost for AWS, Google, Azure ...
Electrical power calculator
Volt x Amp → Watt, kWh, Ah, Joule, calorie
Bash boilerplate generator
Deliberate practice according to Malcolm Gladwell
RGB color conversion
RGB ⇆ CMYK, HSV, XYZ ...
CMYK color conversion
CMYK ⇆ RGB, HSV, XYZ ...
HTML Color list
List of named HTML colors
Pantone Color list
List of named Pantone colors
Websafe Color list
List of websafe colors
Aspect ratio calculator
Image W x H → aspect ratio
Megapixel calculator
Image W x H → megapixels
Megapixel Aspects
See megapixels in different aspect ratios
DPI calculator
Print W x H and dpi → megapixels
Composition calculator
Focal length, subject distance, crop factor → image composition
Depth-of-Field calculator
Aperture, focal length, subject distance, crop → depth-of-field
Light calculator (EV)
Aperture, shutter time, ISO → Exposure Value
Frame rate converter
Framerate conversion with ffmpeg and sox
Video bitrate calculator
Estimate video bitrate based on resolution, fps and bit depth
Common video bitrates
List of common video bitrates (Prores, DV, DCP, MPEG...)
Video file size calculator
Estimate video file size from resolution and duration
Screen size calculator
Calculate screen size from diagional and aspect ratio
Audio file size calculator
Estimate audio file size for (un)compressed audio
DCP file size calculator
Calculate DCP audio and video filesizes
Beats-per-minute
Convert BPM to beat, measure and song length
Tap your tempo
Tap to find the BPM of a song or a heartbeat
HTML encoder
Encode text full of àççéñts
HTML char map
View all special HTML/Unicode characters
Web Speed/SEO Performance Checks
Check your site on 10+ performance test sites
HTTPS readiness check
Is your site correctly configured for HTTPS?
Speed converter
m/s ⇆ km/h, mph, mach
Acceleration calculator
Convert m/s² into in/s², g
Distance calculator
Speed x time → distance
Mortgage loan calculator
Calculate monthly payments for a mortgage loan
Fuel Cost calculator
How much $ does your car fuel cost per year?
Gladwell's 10000 hour-rule
Deliberate practice according to Malcolm Gladwell
Examples of how to use the tools
Show me how I can use these tools
History & development
What? Who? Why? How?
Contact
Remarks about this site? Let me know!
Development blog
Progress on the technical side
Terms & Conditions
Terms & conditions
Privacy Statement
Privacy statement (GDPR compliant)
Donations/wishlist
How to show your appreciation