Paint quantity calculator
Estimate wall area, paint volume and can counts from room dimensions.
A little less busywork
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Tile quantity calculator
Estimate tiles, boxes and material cost for an area with a waste allowance.
Concrete volume calculator
Calculate concrete volume for a slab, cylinder or rectangular footing.
Solar energy estimator
Estimate daily and monthly output from panel capacity, sun hours and losses.
Solar payback calculator
Estimate simple payback from installation cost, generation and electricity value.
Room floor-plan designer
Arrange furniture to scale in a simple 2D room.