Common Tasks
Paint Walls and Ceilings
Tile or Install Flooring
Hang and Finish Drywall
All Surfaces & Finishes Calculators
Paint Coverage Calculator
paint
Calculate how many liters of paint you need for walls, ceilings, and trim using room dimensions, coat count, and standard coverage rates.
Room Paint Calculator
paint
Calculate paint needed for a room by entering length, width, and height. Wall area auto-computed with L/gal toggle — no door or window counting required.
Exterior Paint Calculator
paint
Estimate exterior paint quantity with a surface type selector for brick, wood, stucco, and render. Coverage rates adjusted per surface with L/gal toggle.
Paint Cost Calculator
paint
Estimate total paint cost from quantity and price per liter or gallon. Includes coats, waste factor, and an itemized cost breakdown table.
Tile Calculator
flooring
Work out how many tiles to order for floors and walls, with waste factors adjusted for grid, diagonal, and herringbone patterns.
Flooring Calculator
flooring
Estimate flooring materials — laminate, vinyl, or hardwood — for any room size, including waste allowance for cuts and fitting.
Drywall Calculator
interior
Calculate the number of drywall sheets for walls and ceilings, with deductions for doors, windows, and standard sheet sizes.
Drywall Paint Calculator
paint
Calculate paint quantity for drywall with surface condition selector — unprimed new drywall requires more paint due to absorption. Includes L/gal toggle.
Decking Calculator
outdoor
Calculate deck boards needed for your outdoor deck, with waste factors adjusted for board direction, joist spacing, and deck shape.
Self-Leveling Compound Calculator
flooring
Calculate bags of self-leveling compound for floor preparation based on area, pour depth, and product coverage rate.
Primer Calculator
paint
Calculate primer gallons needed for drywall, wood, masonry, or previously painted surfaces with coverage rates by surface type.
Joint Compound Calculator
interior
Calculate joint compound, paper tape, and drywall screws by sheet count and finish level per Gypsum Association standards.
Trim Paint Calculator
paint
Calculate trim and baseboard paint quantity from linear metres. Converts trim length to effective area using trim type width — baseboard, door casing, or window trim.
Fence & Deck Stain Calculator
paint
Calculate fence and deck stain quantity with wood type selector. Species-specific coverage rates for rough cedar (4 m²/L), smooth pine (8 m²/L), and pressure-treated pine (6 m²/L).
Spray Paint Coverage Calculator
paint
Calculate spray paint quantity with sprayer type selector. Airless and HVLP modes adjust for transfer efficiency. Aerosol mode outputs can count instead of volume.
In-Depth Guide
Learn the concepts behind these calculators with worked examples and reference tables.
Surfaces & Finishes Guide →