Kod5.com is a free online platform offering: - Engineering calculators - Mechanical tools - DXF generators - ISO & DIN standard references - Web utilities for engineers and developers All tools are actively maintained as of 2026.

How do the engineering calculators work?

Engineering calculators work as follows: 1. Enter your input values. 2. Click 'Calculate'. 3. Receive instant results. All calculators run in your browser, follow ISO, DIN, and EN standards, require no installs, 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?

Bolt sizing and torque charts, chain length and gear dimensions, fits and tolerances with tolerance stack-up, surface roughness, hydraulic and pneumatic force, DXF generation and unit conversion — with new tools 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.

Free Mechanical & Web Tools — Calculators

Engineering

These calculators run in the browser and follow published ISO, DIN, or EN standards, with the source standard and a worked example 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 — returns geometry you can hand to a machinist or a CAM package.

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 5480/5482 splines, DIN 13 thread pitches, and bolt torque tables — every entry cites its source standard, and where a table could be read two ways, a note says which clause applies.

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. Everything runs in the browser or as a copy-paste script: nothing to install, nothing to upload.

Downloads

Vetted freeware and the VBA/VBS macros behind real production spreadsheets — only programs that have actually been tested appear here, so downloads stay free of bundles and adware. Nothing asks for an account or a license key, and files are hosted so they can be checked before use.

Finance

Fuel and gas costs, Turkish VAT (KDV Hesapla), salary conversion, date arithmetic, and a few crypto tools for project-side checks. Enter a value, read the answer, and move on — no accounts or login required.

Others

Small, single-purpose tools for break-time splitting, CE marking checks, and line numbering — plus a few games (İsim Şehir, okey scoreboard, virtual piano) for downtime. Client-side, nothing to install, no registration.

About Kod5

Kod5 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 of 50+ calculators, converters, and references — all in the browser, no sign-ups, no ads. Most tools came from real problems (a 2 AM bolt torque check, a tolerance stack-up, a DXF SolidWorks wouldn't export). If you work with machines, pipes, gears, or code, there's probably something here that saves you a few minutes.

Kod5: Free Mechanical & Web Tools