Baurechner

Baurechner is a website offering free online calculators for renovation materials and costs. It helps users estimate quantities and prices for paint, tiles, laminate, wallpaper, screed, and plaster based on room dimensions. The tools account for waste and round up results to whole purchasable units like cans, packages, rolls, and bags.

The platform displays the underlying formula for every calculation so users can verify the math. All results are explicitly stated as non-binding estimates that do not replace professional advice. Users must check their inputs because the figures are directional values without guarantee.

For paint, the calculator uses a standard efficiency of 6-8 square meters per liter per coat. It automatically deducts approximately 2 square meters for each standard door and 1.5 square meters for each window. The tool assumes two coats are typically needed but notes that three may be required for strong color contrasts or cheaper paints.

When calculating tiles, the tool includes a waste factor of 8% for straight layouts, 12% for diagonal patterns, and up to 15% for fishbone patterns or rooms with many corners. It also estimates adhesive consumption based on trowel tooth depth, ranging from 1.7 kg/m² at 4mm to 3.3 kg/m² at 10mm. Grout mass is calculated using a standard approximation formula involving tile format and joint width.

Wallpaper calculations follow the 'handwerker-faustformel' (tradesman's rule of thumb) and include the pattern repeat (Rapport). The tool notes that a small reserve is advisable for repairs, though the automatic rounding to whole rolls usually provides enough surplus.

The screed calculator converts area and thickness into dry mass, sacks, and volume. The plaster calculator supports gypsum, lime-cement, or decorative plaster, outputting both the total mass and the number of required packages or bags.

The website states that the most common issue with other material calculators is providing only a raw quantity, such as 11.3 liters of paint, which is difficult to use in a hardware store. Baurechner addresses this by rounding up to actual purchasable bundles and providing a rough cost framework with adjustable prices.

The tool explicitly warns that after-purchase tiles often come from a different production batch, leading to visible color differences. It advises storing surplus tiles from the waste factor for future repairs since matching decor can be difficult.

For laminate, the recommended direction is parallel to the light source coming from the window to minimize the visibility of joints. In narrow rooms, a longitudinal layout is suggested to stretch the visual space.

The FAQ section links directly to specific calculators for each topic, including wall paint, tiles, laminate, wallpaper, screed, and plaster. Each link takes the user straight to the corresponding tool on the website.

The site notes that the number of coats depends on the paint quality and contrast, with two being standard but three possible for difficult conditions. It also mentions that the efficiency of the paint is the decisive factor and should be taken from the product label.

The calculator allows users to adjust the price per liter to generate a cost estimate. It emphasizes that manufacturer consumption and processing data on the packaging are the authoritative sources for final decisions.

The official website of Baurechner is heimwerkerrechner.de.

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