Kod5: Free Engineering & Web Tools
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Kod5.com
Kod5.com started as a side project by a mechanical engineer who got tired of hunting for the same formulas every week. It grew into a toolbox with 50+ calculators, converters, and reference pages — all running in the browser, no sign-ups, no ads.
Most of the tools here came from real problems: a bolt torque check at 2 AM, a tolerance stack-up that needed a fast answer, a DXF export that SolidWorks wouldn't do right. If you work with machines, pipes, gears, or code, there's probably something here that saves you a few minutes.
Every formula follows published standards — ISO, DIN, EN — and the Kod5 team keeps the math current as standards are revised. Details on who we are on the About page.
Connect, Share & Info:
For more information, users can share tools via social media or access detailed walkthroughs on the YouTube channel and source code on GitHub.
Browsing the site is set up like a deck of cards. The 'Previous' (‹) and 'Next' (›) buttons in the top menu walk you through the pages in order — start at the index, flip through Engineering and Design, then land on Downloads.
The order follows the menu categories, so you always know roughly where the next page takes you. It works without JavaScript: bookmarks and direct links to any tool load on their own.
The search box at the top filters pages live by name — jump straight to "torque" or "tolerance" instead of scrolling. If you find something missing or a formula that looks wrong, the suggestion link is always open.
Engineering
Engineering calculators run entirely in the browser and follow published ISO, DIN, or EN standards. They cover bolt sizing, friction, chain length, power, and unit conversion. No installation, and no data leaves your device.
The source standard is named on each page:
The full list is on the DIN EN ISO Standards reference.
Design
Geometry and drawing output: a DXF generator that runs in the browser, ISO 5455/5457 layout planning, cones (ISO 3040), keyways, cutting offsets, and a quick shaft check.
Fluid Systems
Hydraulic and pneumatic sizing from pressure, area, and flow: cylinder force, motor torque, air consumption, and tank capacity in standard units.
QA
Tolerance stack-up, FMEA-style risk scoring, a revision request form, and SMD code decoding — checks that catch problems before fabrication.
Standards & References
ISO 286 fits, DIN 471/472 circlip grooves, DIN 6885 keyways, DIN 13 thread pitches, and bolt torque tables — every entry cites its source standard.
IT
Small text and code utilities: HTML compressors, line and mail filters, character-set adjusters, an ASCII reference, and VBS fixes for aging Windows scripts.
Downloads
Vetted freeware and the VBA/VBS macros behind real production spreadsheets.
Finance
Fuel and gas costs, Turkish VAT, salary conversion, date arithmetic, and a few crypto tools for project-side checks.
Others
Practical tools for break-time splitting, CE marking checks, and line numbering — plus a few games for downtime.
How the tools work
Every tool page tells you which ISO, DIN, or EN method it follows, shows the formula it uses, and explains the result in plain steps — so you can reproduce a value by hand before you trust it on the drawing.
Example — tightening torque (M10, property class 8.8):
Every chart on Kod5 follows the same pattern — size, grade, value, and the standard it came from.
Calculator, DXF, or Excel kit?
Kod5 delivers the same standards in three formats. Pick the one that fits the job:
Same method, same numbers — only the delivery medium changes.
Most alternatives are paid CAD add-ons that need installs and licenses, or free pages that return a result without ever naming the standard behind it. Kod5 stays free, runs in the browser, needs no account, and states the ISO, DIN, or EN method behind every number — so the value you read is one you can defend in a design review.
Questions About Kod5.com
What is Kod5.com?
Kod5.com is a free online platform offering:
All tools are actively maintained as of 2026.
How do the engineering calculators work?
Engineering calculators work as follows:
- Enter your input values.
- Click 'Calculate'.
- Receive instant results.
All calculators run in your browser, follow ISO, DIN, and EN standards, require no installs and no sign-ups, and no data leaves your device.
Why are the tools free to use?
Kod5 was built to remove friction from routine engineering work. Keeping the tools free and browser-based means engineers, students and hobbyists anywhere can reach them from any device.
What kind of tools does the site offer?
New tools are added throughout 2026.
Does Kod5 collect my data?
No. There is no account, no sign-up, and no analytics. Every calculation runs entirely in your browser, so your inputs never reach the Kod5 server. Data only leaves your device if you choose to use one of the share buttons.