Chain Sprocket Calculator
Calculate exact mechanical chain lengths, center distances, and sprocket pitch ratios.
Targets
- Conveyor and roller-table drive layouts
- Motorcycle and bicycle final drives
- Whole-pitch link counts and take-up travel
Mechanical and field engineering calculators that survive the workshop floor.
Engineering Kit builds focused calculators for chain drives, planar linkages, epicyclic gear trains, belt drives and pumping systems, in metric or imperial units.
100% offline
Every calculation runs on your device
No account, no sign-in, no data connection. The apps keep working in plant rooms, basements, workshops and field locations where there is no signal.
The app portfolio
Swipe the deck to compare the tools. Each card lists the engineering cases it targets.
Four Bar Linkage
Synthesize, analyze, and animate 4-bar planar mechanical linkages.
Targets
- Crank-rocker layouts and dead-centre checks
- Wiper, hinge and clamping mechanism design
- Coupler curve and transmission angle studies
Planetary Gear Calculator
Analyze epicyclic gear ratios, sun/planet/ring gear teeth counts, and rotational speeds.
Targets
- Servo gearhead and robotics reduction stages
- Automatic transmission member speeds
- Tooth-count feasibility and assembly spacing
Pulley Calculator
Calculate belt lengths, speed ratios, pitch diameters, and RPM settings.
Targets
- Fan, blower and compressor drive trims
- Machine-tool spindle speed changes
- Belt span and centre distance selection
Pump Sizing
Total dynamic head, pipe friction loss, fitting losses and the pump duty you need to specify.
Targets
- Pressure, velocity and elevation head breakdown
- Custom fluids and multi-material pipe roughness
- Client-ready PDF calculation reports
Triangle Calculator
Solve remaining sides and angles, then read perimeter, area and all three heights.
Targets
- SSS, SAS, ASA and SSA input sets
- Roof, brace and truss layout on site
- Heights, area and perimeter in one pass
Interactive engineering demos
Drive the inputs and watch the geometry redraw in real time. These previews deliberately stop short of the numbers: chain lengths, centre distances, gear ratios and belt lengths all stay in the Android apps.
Chain Sprocket Calculator demo
Adjust pitch, tooth counts and centre distance to reshape the chain wrap.
12.7 mm
21 T
13 T
420 mm
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Four Bar Linkage demo
Change the four link lengths and watch the mechanism cycle and trace its coupler curve.
200 mm
60 mm
200 mm
160 mm
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Planetary Gear Calculator demo
Enter sun and ring tooth counts to rebuild and animate the epicyclic train.
24 T
96 T
Planet count
Planet teeth follow the concentric constraint, and the drawn planet count drops back whenever the requested planets would not clear each other.
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Pulley Calculator demo
Size the driver and driven pulleys and watch the belt span redraw.
200 mm
100 mm
450 mm
The belt follows the external tangents, so the wrap angle on the small pulley shrinks as the ratio opens up.
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Built for the people who have to make it fit
Engineering Kit apps are deliberately narrow. Each one solves a single sizing problem completely, with the assumptions written down next to the result.
Metric and imperial
Switch unit systems per field. ANSI and ISO chain pitches, module and diametral pitch, L/s and GPM.
Geometry you can see
The drive calculators redraw as you type, so an impossible selection shows up before you order the parts.
Contact us
Questions about a calculation, bug reports and feature requests are all welcome by email.
support@engineeringkit.net