Engineering calculators and tools
Explore geometry, construction quantities, units, mechanics and fluids. Each tool explains its inputs, calculation and scope.
Plan your home
Start an editable home brief: record your needs and priorities without assumed layouts or estimates.
Reinforcement guides
Development length · Lap length. These guides explain the information needed for a design check; they do not calculate design lengths.
Connected engineering model
Explore the BIM foundation example: stable identities, relationships, revisions and IFC exchange.
RCC member workflows
RCC beam · RCC column · RCC slab: supplied-force section design aids and full reinforcement views.
Laboratory worksheets
Cement, aggregate and soil lab calculators with observation tables and calculation traces.
Choose a calculator
- Rectangular area & perimeter
- Rectangular tank capacity
- Slope & gradient
- Length unit converter
- Circle measurements
- Triangle measurements
- Trapezoid area
- Circular tank capacity
- Hollow pipe geometry
- Rectangular concrete quantity
- Formwork contact area
- Straight reinforcement weight
- Equal-spacing layout
- Engineering unit converter
- Arc and sector
- Circular segment
- Annulus
- Regular polygon
- Coordinate polygon
- Right circular cone
- Right circular frustum
- Sphere and spherical cap
- Horizontal circular tank
- Sloped rectangular excavation
- Rectangle section properties
- Circular section properties
- Rectangular hollow section
- Annular section properties
- Isosceles triangle section
- T section properties
- Symmetric I section properties
- Channel section properties
- Parallel-axis area moment
- Area radius of gyration
- Distance between coordinates
- Line azimuth and distance
- Offsets from distance and azimuth
- Intersection of two straight lines
- Along-line distance and offset
- Elevation from a grade
- Single-setup level reduction
- Level-run closure arithmetic
- Average-end-area earthwork
- Prismoidal earthwork volume
- Net masonry volume
- Modular brick quantity
- Plaster wet volume
- Paint quantity from coverage
- Rectangular tile grid
- Linearly tapered screed
- Loose fill volume allowance
- Material mass and weight
- Trapezoidal stockpile volume
- Rectangular duct sheet area
- Average axial stress
- Elastic axial deformation
- Free thermal length change
- Two springs in series
- Two springs in parallel
- Ideal lever equilibrium
- Simply supported point load
- Simply supported uniform load
- Cantilever end point load
- Plane stress transformation
- Hydrostatic pressure
- Pressure expressed as head
- Mean velocity in circular pipe
- Circular pipe discharge
- Pipe Reynolds number
- Darcy–Weisbach head loss
- Local loss from coefficient
- Manning uniform-channel flow
- Hydraulic pump power
- Tank filling time
- Room finishing quantity estimate
- Stirrup & link cutting length — review draft
- Spiral reinforcement length — review draft
Interactive calculators require JavaScript and the calculation service.