Kod5: Free Mechanical & Web Tools
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:
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.
Not sure where to start? Shortest path to the right section:
- Need a single engineering number? — bolt size, torque, power, chain length, unit → Engineering.
- Need a drawing, DXF, or layout? → Design.
- Working with pressure, force, or flow? → Fluid Systems.
- Checking tolerances, fits, or risk? → QA and Std & Ref.
- Cleaning text, HTML, or mail? → IT.
- Want a reusable spreadsheet or a tested download? → Downloads and Excel kits.
- Quick cost or date check? → Finance.
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
These mechanical calculators run in the browser and follow published ISO, DIN, or EN standards:
The source standard is named on each page:
The full list is on the DIN EN ISO Standards reference.
- Results follow ISO, DIN, or EN, so the number matches what a drawing or supplier expects.
- The formula is shown on each page, so the math can be reproduced by hand before you trust it.
- Runs in the browser with no installs, sign-ups, or data leaving your device.
- Formulas are fixed to the standard method — custom coefficients or non-standard choices are not supported.
- One value at a time, so comparing many cases across a table is manual.
- Static inputs: material grade, tooling, and conditions must be entered by you.
When to use: sizing a bolt, setting torque, checking friction or chain length, gear dimensions, or any single-value engineering number.
Choose Engineering when you need a single standards-backed number — torque, force, size — and you can enter the measured inputs yourself; ideal for engineers doing design checks before a drawing is released.
If you need a ready-to-print table value instead, see Std & Ref; if the deliverable must be geometry, see Design.
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.
Each tool accepts the units you already work in and returns geometry you can hand to a machinist or a CAM package:
- Produces real, downloadable output — DXF profiles, ISO 5455 layouts, and printable geometry.
- Built on published standards (ISO 5455, 5457, 3040), so output matches shop expectations.
- Accepts the units you already work in and returns geometry a CAM package can import.
- Geometry only — no assemblies, constraints, or full CAD modeling.
- Fillets, threads, tolerances, and finish still need manual checks.
- DXF output is 2D profile generation; complex 3D parts are out of scope.
When to use: producing a drawing or DXF, planning a layout sheet, or checking geometry before it goes to a machinist.
Choose Design when your deliverable has to be a file or drawing a machinist or CAM package can open — designers and mechatronics teams — not when you need parametric modeling.
If you only need a dimension value rather than geometry, see Engineering; for drawing-scale rules see Std & Ref.
Fluid Systems
Hydraulic and pneumatic sizing from pressure, area, and flow: cylinder force, motor torque, air consumption, and tank capacity in standard units.
- Sizes cylinders, motors, tanks, and compressors directly from pressure, area, and flow.
- Works in standard SI or imperial units with consistent conversion.
- Covers both hydraulic and pneumatic sides, including duty-cycle air consumption for compressor sizing.
- Assumes static working values; dynamic losses and long-line friction are not modeled.
- Pump curves and valve pressure drops must be supplied by the user.
- Simplified assumptions mean full system simulation is still needed for precision work.
When to use: sizing cylinders, motors, pumps, tanks, or compressor air consumption from a working pressure and bore or flow.
Choose Fluid Systems when you know the working pressure and duty and need a component size — hydraulics designers and maintenance engineers — not when you need a complete pipe-network simulation.
If you need the motor power behind a drive instead of the cylinder size, see Engineering → Power Calculation.
QA
Tolerance stack-up, FMEA-style risk scoring, a revision request form, and SMD code decoding — checks that catch problems before fabrication.
- Catches tolerance collisions before machining using worst-case or statistical stacks.
- Keeps decisions traceable — risk scores and revision requests are recorded on the page.
- Applies FMEA-style scoring (probability × severity) without a spreadsheet.
- Requires an accurate dimension chain — bad inputs give false confidence.
- A gate check only; it does not replace a moderated FMEA session or CMM inspection.
- Statistical stacks assume normal distributions, which real machining may not follow.
When to use: tolerance stack-up, FMEA-style risk scoring, a revision check, or decoding an SMD resistor label.
Choose QA when a dimension chain, failure mode, or drawing change needs a quick documented gate check before fabrication — quality engineers and design reviewers.
If you need the fit letter or number behind the stack instead, see Std & Ref → ISO Fits.
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.
- Values come straight from published ISO/DIN/EN documents with the source clause named.
- Broad coverage — fits, threads, keyways, splines, circlips, torques, and roughness.
- Each entry cites its standard, so a value can be defended in a design review.
- Covers standard sizes and standard series only.
- Obsolete or non-standard variants (custom pitches, legacy fits) may not be listed.
- Reference only — it gives values, not application judgment.
When to use: looking up a standard table — fits, threads, keyways, torques, splines, circlips, or roughness with the source cited.
Choose Std & Ref when you need a table value with its source standard — engineers, students, and procurement teams doing drawing reviews.
If you need to compute the interaction of those values in a stack, see QA → Tolerance Stack-up.
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 here runs in the browser or as a copy-paste script, so there is nothing to install and nothing to configure. Line and mail filters de-duplicate exports before they go into a spreadsheet, and the IT services page lays out the coding and admin work Kod5 can take on.
- Fast, browser-based cleanup of HTML, lines, mail, encoding, and numbering.
- No install, no upload, no account — paste and run client-side.
- Covers legacy Windows script repair (VBS fixes) that modern tools no longer address.
- Manual, copy-paste workflow — no server-side bulk automation.
- Large batches are handled file by file, not in parallel.
- Results depend on input encoding; badly broken files may need manual prep.
When to use: compressing HTML, filtering or numbering lines, decoding ASCII, cleaning mail, or repairing legacy Windows scripts.
Choose IT when text or code needs a quick local cleanup and you want nothing uploaded — admin and support staff working on markdown or log files.
If the task is a calculation instead of text cleanup, see Engineering or Finance.
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. The macros and Excel kits come from production workbooks:
Nothing here asks for an account or a license key, and the files are hosted so they can be checked before use. Free software stays free software.
- Only tested, vetted freeware — no bundles, adware, or license traps.
- Macros and Excel kits come from production workbooks with real use behind them.
- Files are inspectable before running, keeping the download chain transparent.
- Must be downloaded and run locally — not browser-based.
- Macros require Excel and a one-time enable step.
- Compatibility depends on the host OS and Excel version you use.
When to use: grabbing vetted freeware or a macro/Excel kit you can run repeatedly in your own workbook.
Choose Downloads when you want a tested, reusable file or macro rather than a one-off browser calculation — Excel-heavy Windows users.
If you just need the answer right now, use the online calculator in the matching section instead.
Finance
Fuel and gas costs, Turkish VAT, salary conversion, date arithmetic, and a few crypto tools for project-side checks.
Enter a mileage and price to see a fuel or gas fill-up cost, work out a price with the Turkish VAT rate in KDV Hesapla, and follow net pay with the live salary tracker. Date math such as "x days later" and a crypto bot profit calculator round out the list.
These stay deliberately simple: enter a value, read the answer, and move on. The salary tracker updates against cost-of-living changes so a raise or a new rent shows up in net pay immediately, and the coin pages give a snapshot of markets without an account or a login.
- Immediate costing output — fuel, gas, VAT, salary, dates — with no accounts or login.
- Inputs match common real-world questions, so the number is useful right away.
- Runs client-side; nothing you enter is transmitted or stored.
- Static rates and assumptions — not a budgeting or forecasting platform.
- Crypto pages are snapshots for project-side checks, not live trading advice.
- Not financial or investment advice and not for compliance work.
When to use: quick costing — fuel or gas fill-ups, Turkish VAT, net salary, date arithmetic, or a project-side crypto check.
Choose Finance when you need a quick cost, VAT, salary, or date figure and do not want to build a spreadsheet — freelancers and small teams.
If the driver behind a cost is a mechanical size or torque, see Engineering for the underlying value first.
Others
Practical tools for break-time splitting, CE marking checks, and line numbering — plus a few games for downtime.
Split a lunch break fairly across a team, run a CE marking sanity check before a product ships, and number lines for documents or code. İsim Şehir and the okey scoreboard cover the downtime, and the virtual piano needs nothing but a keyboard.
Think of this as the utility drawer of the site — small, self-contained tools that each do exactly one job. They cost nothing, run client-side with no registration, and are small enough to keep open in a tab for the moments a quick number or a short game is needed.
- Tiny, single-purpose tools with zero setup or friction.
- Run fully client-side with no registration.
- Good for downtime (games) without installing anything.
- Each tool solves exactly one small job.
- No combined or multi-step workflows.
- Outputs are not saved or integrated across tools.
When to use: a one-off utility — splitting a break, a CE-mark sanity check, line numbering, or a short game for downtime.
Choose Others when a small one-off task or a short break is the only thing on your list — casual users doing quick sanity checks.
If the task grows beyond one small step, move to the matching main section — Engineering, IT, or Finance.
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.
If a result still does not line up with your drawing, the page names the variables, units, and the exact clause it used, so the discrepancy usually turns out to be a unit or diameter choice rather than a hidden constant.
Calculator, DXF, or Excel kit?
Kod5 delivers the same standards in three formats. Pick the one that fits the job:
| Format | Strengths | Limitations | Best for |
|---|---|---|---|
| Online calculator | Instant result in the browser; nothing to install; no data leaves your device. | Formula is fixed; result is not saved to your machine unless you copy it. | One-off checks — fits, torque, stack-ups. |
| DXF file | Downloadable, CNC/laser-ready geometry; imports into any CAD or CAM package. | Contains geometry only — the calculation itself is not stored in the file. | Outputs that go straight to machining or laser. |
| Excel kit / macro | Reusable offline; formula stays editable inside your own workbook. | Requires Excel; some macros need a one-time setup and enable step. | Repeatable workbooks, weekly recalculations. |
When to use: one-off check → online calculator; cut or machine it → DXF; repeat it every week → Excel kit.
Choose the online calculator for a single instant answer (engineers doing quick checks), the DXF when a machinist or laser needs a file, and an Excel kit when the same math returns every week (Excel-heavy users).
Not sure which section holds your tool? Use the decision guide above or the live search box.
Same method, same numbers — only the delivery medium changes.
Compared with the alternatives:
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 in 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 mechanical 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.
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