free web tools & calculators

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?

Data tools

Bandwidth convert
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
Volt x Amp → Watt, kWh, Ah, Joule, calorie

Bash boilerplate
Deliberate practice according to Malcolm Gladwell

Color tools

RGB conversion

CMYK conversion

HTML Color list
List of named HTML colors

Pantone Color list
List of named Pantone colors

Websafe Color list
List of websafe colors

Photo tools

Aspect ratio
Image W x H → aspect ratio

Megapixel calculator
Image W x H → megapixels

Image filesizes
Image W x H → bytes

Megapixel Aspects
See megapixels in different aspect ratios

DPI calculator
Print W x H and dpi → megapixels

Composition calc
Focal length, subject distance, crop factor → image composition

Aperture, focal length, subject distance, crop → depth-of-field

Light calculator (EV)
Aperture, shutter time, ISO → Exposure Value

Video tools

Frame rate convert
Framerate conversion with ffmpeg and sox

Video bitrate
Estimate video bitrate based on resolution, fps and bit depth

Common bitrates
List of common video bitrates (Prores, DV, DCP, MPEG...)

Video file size
Estimate video file size from resolution and duration

Screen size
Calculate screen size from diagional and aspect ratio

Audio file size
Estimate audio file size for (un)compressed audio

DCP file size
Calculate DCP audio and video filesizes

Music tools

Convert BPM to Hz, bar length

Audio delay
Calculate delay length in msec

Song length
Calculate song length from BPM

Tap your tempo
Tap to find the BPM of a song or a heartbeat

Web tools

HTML encoder
Encode text full of àççéñts

HTML char map
View all special HTML characters «»

Emoji char map
View all special Unicode characters 🥠

SEO Performance
Check your site on 10+ performance test sites

HTTPS config check
Is your site correctly configured for HTTPS?

Redirection check
Is your site redirection correctly configured?

Calculator tools

Speed converter
m/s ⇆ km/h, mph, mach

Acceleration calculator
Convert m/s² into in/s², g

Distance calculator
Speed x time → distance

Exponential growth
Exponential growth / logarithmic decay

Mortgage loan calculator
Calculate monthly payments for a mortgage loan

Fuel Cost calculator
How much $ does your car fuel cost per year?

Electric Car calculator
How much $ does your electric car use in kWh per year?

Gladwell's 10000 hours
Deliberate practice according to Malcolm Gladwell

About tools

How to use the tools
Show me how I can use these tools

What? Who? Why? How?

Remarks about this site? Let me know!

Development blog
Progress on the technical side

Terms & Conditions
Terms & conditions

Privacy Statement
Privacy statement (GDPR compliant)