# toolstud.io

**Role:** Founder · **Website:** [toolstud.io](<https://toolstud.io>)

[![toolstud.io](<https://www.forret.com/portfolio/img/toolstudio.jpg>)](<https://www.forret.com/portfolio/img/toolstudio.jpg>)

toolstud.io is a collection of free web-based calculators, converters and other tools, and one of my oldest projects.

## Tools by audience

- [Bandwidth converter](<https://toolstud.io/data/bandwidth.php>): GB/month, Mbps, MB/hour
- [Megapixel calculator](<https://toolstud.io/photo/megapixel.php>): image size for TIF, BMP, JPG and PNG, plus aspect ratio
- [HTTPS config check](<https://toolstud.io/network/https.php>)
- [HTTP redirection check](<https://toolstud.io/network/redirect.php>)

- [BPM calculator](<https://toolstud.io/music/bpm.php>): BPM to milliseconds
- [Audio delay calculator](<https://toolstud.io/music/delay.php>)
- [Musical frequency calculator](<https://toolstud.io/music/hertz.php>): notes and Hz

- [Aspect ratio calculator](<https://toolstud.io/photo/aspect.php>)
- [Video file-size calculator](<https://toolstud.io/video/filesize.php>)
- [Video frame-rate conversion](<https://toolstud.io/video/framerate.php>)
- [Depth-of-field calculator](<https://toolstud.io/photo/dof.php>)