Kod5: Free Mechanical Calculators & Web Tools

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.

Standards & References

Our DIN EN ISO standards reference covers 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.

Example: for a Ø25 mm H7 hole (18–30 mm range), the lower deviation is 0 µm and the upper deviation is +21 µm (IT7, ISO 286-2). Full calculation: ISO Fits and Tolerances.

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.

Fasteners

Bolt sizing, bolt torque charts, thread pitches, nut dimensions, circlip grooves (DIN 471/472), keyways (DIN 6885), and a fastener ordering tool — all the dimensioning and ordering references for metric fasteners in one place.

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

Tolerance stack-up calculator, FMEA-style risk scoring, and a revision request form — checks that catch problems before fabrication.

IT

Small text and code utilities — HTML compressors, line and mail filters, character-set adjusters, an ASCII reference, VBS fixes for aging Windows scripts, plus vetted freeware and production macros. Everything runs in the browser or as a copy-paste script: nothing to install, nothing to upload.

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, and line numbering — plus a few games (İsim Şehir, okey scoreboard, virtual piano) for downtime. Client-side, nothing to install, no registration.

About Kod5

  • Started as a side project by a mechanical engineer who got tired of hunting for the same formulas every week.
  • Grew into a toolbox of 50+ calculators, converters, and references, all running in the browser.
  • No sign-ups, no ads.
  • Most tools came from real problems: a 2 AM bolt torque check, a tolerance stack-up, or a DXF that SolidWorks would not export.
  • If you work with machines, pipes, gears, or code, there is probably something here that saves you a few minutes.

Ways to Get the Same Numbers

Values such as fit tolerances, thread dimensions, torque figures and gear geometry can be found in several ways. Each option trades off cost, setup and speed.

  • Official standard documents (ISO, DIN, EN): the authoritative source. Usually paid, and you look up the tables yourself. Not in browser.
  • Spreadsheet (e.g., Excel): flexible, and you control every formula. You build and check the formulas and tables yourself. Not in browser.
  • CAD built-in tools: useful inside your design, but they need a CAD license and only work within that software.
  • Printed handbooks and charts: quick to check at the bench, but they cover fewer sizes and may not be current.
  • Kod5 tools: free, no install or sign-up, and they run in the browser. Each tool page names the standard it is based on, so you can check it against the original document.

Use Kod5 for a quick, standard-referenced answer. For a certified or contractual design, confirm the final value against the original standard.

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