PencilSum
Home-project calculators that show the answer first and the working behind it.
- Answer as you type
- Every figure sourced and dated
- No sign-up, ever
Concrete
- Concrete calculator How much concrete your slab needs, in cubic yards and bags, with the working shown.
- Concrete cost calculator What your slab costs three ways: bags, ready-mix delivered, or a pro, as honest dated ranges.
- Concrete bag calculator How many bags of concrete you need for any bag size, and how much they weigh in total.
- Fence post concrete How many bags of concrete your fence posts need, with the right hole size and depth.
Roofing
- Roofing calculator Your roof area, squares, shingle bundles and the main accessories to order, from the ground.
- Roof replacement cost What a new roof costs for your house and material, as an honest dated range. No sign-up.
- Roof pitch calculator Your roof pitch from a rise and run or an angle, with the angle, pitch factor and slope.
Plan a whole job in one list
Add results from any calculator and get one shopping list for the whole job, ready to share, print or take to the store.
Open your project listEvery figure comes from manufacturers, building codes and dated price surveys, and every page shows its working.
How PencilSum works