Civil engineering guides & calculators
Practical, IS-code-based notes on quantity estimation, concrete, and house planning — for engineers, contractors and homeowners. Every calculation can be run automatically inside CivilOS.
Bar Bending Schedule (BBS)
Cutting length, bend deductions, hooks, laps & stirrups per IS 2502 / SP 34 — with worked examples.
BOQBrickwork quantity calculation
Bricks, cement & sand needed per m³ of brickwork (IS 2212), with a worked example.
ConcreteConcrete mix (M20) calculation
Cement bags, sand and aggregate per m³ for M20 nominal mix — the 1:1.5:3 method.
IS CodesIS 456 concrete cover
Nominal cover to reinforcement for slabs, beams, columns and footings — quick table.
PlanningMake a house plan online
How to turn a plot size into a scaled floor plan and AutoCAD drawing in minutes.
EstimationCPWD & PWD Schedule of Rates
What an SOR/BSR is, how rates feed a BOQ, and how to keep them current.
LightingLux levels for rooms
Recommended lux for every room type, uniformity and glare limits, and the lumen method to count lights.
BOQPlaster quantity calculation
Cement bags and sand for 6, 12, 15 and 20 mm plaster, with the dry-volume method worked through.
ReinforcementSteel weight calculation (D²/162)
Where D²/162 comes from, a kg/m table for 6–40 mm bars and a worked example.
CADAutoCAD commands list
Every alias a drafter types — draw, modify, dimension, layers, blocks, plot, 3D — with F-keys and Ctrl keys.
The software behind the guides
Every calculation above has a tool that does it for you. Each one has its own page — what it does, how to use it, and honestly what it does not do.
CAD software · BIM software · 3D building design software · architecture software · MEP drafting software · structural detailing software · bar bending schedule software · estimation software · cost estimation software · BOQ software · quantity surveying software · construction planning software · GIS software · site audit & QA/QC app · AI civil engineer — or the full software index.