Use-case guides
Answers for one specific scenario at a time
Each guide takes a real question, shows the assumptions behind the answer, walks through a worked example, and hands you the calculator so you can swap in your own numbers.
Use-case index
2
scenario guides
Why these exist
Calculators answer the general question. Use-case guides answer the exact one people search for, then route into the calculator for the rest.
Use-case guides
Pick the scenario closest to yours, then adjust the inputs in the calculator.
2 guides
How much concrete do I need for a patio slab?
Estimate the concrete for a patio slab, with a worked 12x12 example at 4 inches thick, a 10% waste factor, and a calculator to size your own pour.
How much paint do I need for a 12x12 room?
Figure out how much paint a 12x12 room needs, with a worked wall-area example, real coverage numbers, and a calculator to run your own measurements.
Need the calculator directly?
The directory is the shortest path from inputs to a result.