Build the job room by room and calculate paint, flooring, porcelain tile, adhesive, grout, brick, block and concrete, with waste, can combinations and a shopping list with cost.
You enter each room with its length, width, ceiling height, doors and windows, and the calculator derives the net wall area (perimeter x height minus the openings), the floor area and the baseboard meters. Each module then does its own math: paint divides area times coats by the coverage in m² per liter and picks the cheapest, or least wasteful, combination of 18 L, 3.6 L and 0.9 L cans; flooring adds the layout waste, converts it to boxes and estimates tile adhesive and grout; masonry uses the pieces per m² of the block size plus the joint and derives the laying mortar from the mix; concrete adds the piece volumes and applies a reference mix. The coefficients come from public data sheets and cost compositions, such as Coral, Suvinil, Puma and the Brazilian SINAPI compositions 87292 and 94964, and all of them are editable, because the figure on your own product package always wins. Everything runs in the browser, and the project can be saved, sent as a link and printed. For structural concrete the result is only a consumption reference: the design comes from an engineer, with ART in Brazil.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/construction-materials-calculator"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Construction Materials Calculator (Paint, Tile, Bricks)"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
Take the net wall area, multiply by the coats and divide by the coverage. A 4 x 3 m bedroom with a 2.7 m ceiling, one door (1.6 m²) and one window (2.0 m²) has 14 x 2.7 = 37.8 m² gross and 34.2 m² net. With 2 coats at 9.4 m²/L that is 7.3 L, and 8.0 L with a 10% margin. The best purchase at the example prices is two 3.6 L cans plus one 0.9 L can, or 8.1 L. The coverage printed on your own paint can always beats the default value.
Floor 20 m², walls 43 m² (openings deducted: 5.6 m²)
Floor 10.5 m², walls 31.5 m² (openings deducted: 3.6 m²)
A door of 0.80 x 2.00 m is 1.6 m² and a window of 1.00 x 2.00 m is 2.0 m². Edit them to match your job. With the deduction off, the numbers are more generous.
Estimated total: R$3,789.00 across 6 items.
Estimates for budgeting. Structure (slabs, beams, columns, foundations) needs an engineer and ART.