Olutil stands for Online Utilities — a growing suite of privacy-first, browser-native web tools. This sub-site gives DIYers and home renovators a focused set of material calculators that run entirely in your browser. Estimate how much paint, tile, flooring or concrete you need before you head to the store — all in one place. 100% Local Processing
Work out how much paint a room needs from its size, doors, windows and number of coats, in litres and gallons.
Estimate the number of tiles and boxes for an area from the tile size, grout gap and wastage.
Estimate how many floor boards or planks and boxes you need from the area, board size and wastage.
Estimate concrete volume and cement, sand and aggregate amounts for a slab or a cylinder.
Estimate cement, sand and water for a mortar batch from its volume and mix ratio.
Estimate how many wallpaper rolls you need, with the pattern repeat and wastage allowed for.
Estimate tile grout from the tile size, joint width, thickness and area.
Split a renovation budget across project categories by finish level, with a contingency.
Estimate how many light fittings a room needs and the total lumens and watts.
Estimate cable length from circuits, run distance and device drops, with a size hint.
Work out risers, treads, total run and stringer length from the total rise.
Work out the angle, grade and ratio of a ramp, with accessibility guidance.
Estimate drywall sheets, joint tape and screws for a wall or ceiling.
Estimate insulation volume, packs and the R-value, with a target R-value check.
Estimate fence posts, rails, pickets and concrete from the run and spacing.
Estimate grass seed, topsoil and starter fertiliser for a lawn.
All tools on this site perform their work locally in your browser. Your data is never sent to any server, so the room sizes and measurements you enter stay on your device. Pick a tool, fill in the options, click the run button and read or copy the output.
Yes. Every calculator on this site is free to use, with no account and no sign-up required.
No. The results are approximate estimates for general guidance and planning only. Material use depends on the product, surface and site conditions, so always check the manufacturer's coverage figures and your local building requirements, and buy a little extra for cuts and waste.
Yes. All processing runs locally in your browser. The measurements you enter are not uploaded to any server, and you can use the tools while offline once the page is loaded.