Construction
Rafter Calculator
Common rafter length, plumb cut, and seat cut from span or rise/run.
- Span + pitch or rise/run modes
- Plumb and seat cut angles
- Overhang along the slope
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Construction
Stair Stringer Calculator
Residential stringer layout from total rise and run.
- Automatic riser count selection
- Exact rise and tread depths
- Stringer length and stair angle
Construction
Roof Pitch Calculator
Convert pitch, angle, and slope percent with rafter factors.
- Pitch, angle, and slope % modes
- Common and hip/valley factors
- Rafter length from run
Construction
Concrete Bag Calculator
How many bags of concrete for slabs, footings, and round pours.
- Slab, footing, and round pours
- 40–80 lb bag presets
- Waste percentage options
Construction
Concrete Volume Calculator
Cubic feet and yards for slabs, walls, columns, and round forms.
- Multiple pour shapes
- Waste volume planning
- Cubic feet / yards / meters
Construction
Board Foot Calculator
Lumber board feet, linear feet, and volume from dimensions.
- Classic board-foot formula
- Quantity totals
- Linear and square footage
Popular free calculators
Search-friendly web tools first. Take the matching iPhone app to the job site when you need it offline.
Construction
Rafter Calculator
Common rafter length, plumb cut, and seat cut from span or rise/run.
Construction
Stair Stringer Calculator
Residential stringer layout from total rise and run.
Construction
Roof Pitch Calculator
Convert pitch, angle, and slope percent with rafter factors.
Construction
Concrete Bag Calculator
How many bags of concrete for slabs, footings, and round pours.
Construction
Concrete Volume Calculator
Cubic feet and yards for slabs, walls, columns, and round forms.
Construction
Board Foot Calculator
Lumber board feet, linear feet, and volume from dimensions.
Construction
Feet & Fraction Calculator
Add, subtract, multiply, and divide construction measurements.
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Construction
Rafters, stairs, roof pitch, concrete, lumber, and layout calculators for builders and carpenters.
Electrical
Field electrical tools for installers — conduit, box fill, and voltage drop (rolling out).
HVAC
Pressure-temperature and HVAC field references for technicians.
Plumbing
Pipe size, slope, and rolling offset tools for plumbers and installers.
Landscaping
Yard materials, fence, and deck layout calculators for outdoor work.
Business
Markup, VAT, and small-business math for contractors and operators.
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- Native iOS apps
- Free browser calculators
- Offline-ready iPhone tools
- Construction-aware units
Need a calculator on the job?
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