Trades · Tools
Concrete & Masonry
Slabs, footings, columns, mortar, and block counts.
Concrete volume calculator
How much concrete do I need?
Available nowConcrete for any shape
How much concrete for a driveway that isn't a rectangle?
Available nowTape measure calculator
Add and subtract tape-measure lengths (to 1/64)
Available nowSlope & grade meter
What's the slope of this surface?
Available now
Carpentry & Framing
Stairs, beams and spans, board feet, cut angles.
Stair calculator
How do I lay out a staircase to code?
Available nowRafter calculator
How long do I cut a common rafter?
Available nowWall framing takeoff
How many studs and plates does this wall need?
Available nowDeck boards & joists
How many joists, boards, and screws for this deck?
Available nowJoist & rafter span checker
What size lumber carries this span?
Available nowDeck beam sizer
What beam do I need between these posts?
Available now
Electrical
Ohm's law, wire gauge, voltage drop, conduit fill.
Industrial Electrical
Three-phase power, motor circuits, feeders, and voltage drop.
Automation & PLC
Signal scaling, ladder logic, timers and counters, I/O.
PLC signal scaling
4–20 mA, raw counts, engineering units — what does this signal read?
Available nowLadder logic simulator
Seal-ins, timers, interlocks — watch the classic circuits scan live
Available nowLadder logic builder
Pick your devices, wire your own rungs — and run them live
Available nowPLC troubleshooting trainer
The machine misbehaves and the ladder looks fine — find the fault
Available now
Industrial Robotics
Robot cells from the PLC side: handshakes, program select, safety chains.
Industrial Maintenance
Drive ratios, belts and gears, bolt torque, alignment.
Painting
Room area, gallons, coverage by paint type, costs.
Plumbing
Drain slopes, pipe sizing, pressure.
Estimating
Multi-trade project estimates, markup and margin.