Project Guides
Start with a worked example, understand the assumptions that change the answer, then open the matching calculator with your own measurements.
Project planning guides
Worked quantity, budget, layout, and safety checks for common projects.
How much concrete for a 10×10 slab?
Compare slab thicknesses, concrete yards, bag counts, and extra material.
Read guide →DrivewaysGravel driveway depth and tonnage
Turn driveway measurements into cubic yards and tons without mixing loose and compacted quantities.
Read guide →PaintingHow much paint do I need?
Estimate wall paint from room size, openings, coats, and product coverage.
Read guide →RoofingHow many bundles of shingles do I need?
Convert measured roof area into squares and bundles with a realistic waste allowance.
Read guide →FencingFence post spacing and panel count
Plan installed sections, gates, corners, posts, and spare panels without mixing the counts.
Read guide →LandscapingHow much mulch do I need?
Compare coverage by depth and convert landscape-bed volume into yards or bags.
Read guide →DecksHow much does it cost to build a deck?
Build a transparent budget from area, material, labor, railing, permits, and contingency.
Read guide →FlooringHow much flooring do I need?
Convert room measurements into waste-adjusted square footage and whole cartons.
Read guide →DrivewaysAsphalt driveway thickness and tonnage
Separate compacted pavement depth from the volume and weight calculation.
Read guide →StairsStair rise, run, and riser count
Turn total rise into equal risers, tread count, total run, and a code-check list.
Read guide →Backup powerHow to size a generator
Organize running watts, added startup demand, margin, and critical CO safety checks.
Read guide →Concrete bagHow many bags of concrete do I need?
Turn cubic feet into whole bags using manufacturer-listed yield and a practical extra-material allowance.
Read guide →Lumber measurementHow to calculate board feet
Use thickness, width, length, and quantity to estimate rough-lumber board feet without confusing nominal and actual dimensions.
Read guide →Bulk materialHow many cubic yards do I need?
Convert feet and inches into cubic yards for soil, stone, mulch, concrete, and other bulk materials.
Read guide →Area measurementHow to calculate square footage
Measure common shapes, add separate areas, subtract exclusions, and apply material waste without hiding the assumptions.
Read guide →Roof measurementHow to calculate roof square footage
Use footprint area and a pitch factor to estimate sloped roof area before adding valleys, overhangs, or waste.
Read guide →Tire sizingTire size comparison explained
Decode metric tire sizes and estimate how a size change affects diameter, circumference, and indicated speed.
Read guide →EV chargingHow much does it cost to charge an EV?
Calculate grid energy and charging cost without confusing battery energy with electricity drawn from the wall.
Read guide →3D printing costHow to price a 3D print
Separate print cost from selling price with a worked example covering material, energy, machine time, overhead, and markup.
Read guide →How CalcCaddy guides are prepared
Each guide begins with transparent geometry or unit conversion, separates planning assumptions from product specifications, links to the calculator used for the example, and cites manufacturer, government, or university guidance where appropriate. Final quantities should always be checked against field measurements, product instructions, suppliers, and local requirements.