Build tools
Quantities and sizes for a job
How many gallons, bundles or cartons, which size, and where two running costs cross. Each one shows the working, the assumptions and the sources.
- Paint calculatorPaint for this room2.1 gallonsExample case
- Roof shingle bundle calculatorShingle bundles for the roof62 bundlesExample case
- Fence materials calculatorPickets for the fence204 picketsExample case
- Flooring box calculatorCartons of flooring24 cartonsExample case
- Heat pump vs gas furnaceWhere running costs cross over34 °F outsideExample case
- Water heater size calculatorHot water in the busiest hour36 gallonsExample case
What these are, and are not
These are arithmetic checks built from published sizes and rules, with the constants shown on each page. They are not designs, inspections or code rulings. The people who do the work and the local building office decide what is built.
Where a figure is a guess it is marked as an estimate. How the numbers are built.