# Project Quantity Lab

> Free, product-neutral browser calculators for home project materials, costs, and printable shopping lists. No account or protected API exists. Project inputs stay in the browser unless the user creates a URL containing them.

## Calculators

- [Paint & primer calculator](https://home.utilitas.app/calculators/paint/): Plan paint and primer for multiple rooms, openings, ceilings, coats, coverage, waste, and price.
- [Flooring & tile calculator](https://home.utilitas.app/calculators/flooring-tile/): Combine rectangular, circular, and triangular areas, then estimate pieces, boxes, waste, and cost.
- [Mulch, soil & gravel calculator](https://home.utilitas.app/calculators/landscape-materials/): Estimate volume across multiple beds and compare bagged material with bulk delivery pricing.
- [Concrete volume & bag calculator](https://home.utilitas.app/calculators/concrete/): Combine slabs, footings, post holes, and steps, then compare bag yields and ready-mix volume.
- [Fence material calculator](https://home.utilitas.app/calculators/fence/): Plan runs, gates, post spacing, panels, rails, pickets, concrete, and an editable shopping list.

## Guides

- [How to measure a room for paint](https://home.utilitas.app/guides/measure-room-for-paint/): Measure wall perimeter, height, ceilings, doors, and windows for a paint estimate you can audit.
- [How much paint does a gallon cover?](https://home.utilitas.app/guides/paint-coverage/): Understand label coverage, surface porosity, colour changes, and why exact paint volume differs from cans to buy.
- [Do I need one coat or two?](https://home.utilitas.app/guides/paint-coats/): Choose a realistic coat count based on colour change, surface condition, sheen, and product instructions.
- [How to subtract doors and windows](https://home.utilitas.app/guides/subtract-doors-windows/): Decide which openings are worth subtracting and keep trim calculations separate.
- [Interior painting shopping checklist](https://home.utilitas.app/guides/painting-shopping-checklist/): Build a practical paint-day list covering preparation, protection, application, cleanup, and safety.
- [How to measure an irregular floor](https://home.utilitas.app/guides/measure-irregular-floor/): Break an L-shaped or curved floor into auditable rectangles, triangles, and circles.
- [Choosing a flooring waste allowance](https://home.utilitas.app/guides/flooring-waste-allowance/): Set waste for straight, staggered, diagonal, and pattern layouts without hiding the assumptions.
- [Landscape depth and volume explained](https://home.utilitas.app/guides/landscape-depth-and-volume/): Convert bed area and installed depth into bags, cubic yards, or cubic metres.
- [Bags versus bulk landscape delivery](https://home.utilitas.app/guides/bags-versus-bulk/): Compare usable volume and total delivered cost instead of package sticker prices.
- [Concrete volume and bag yield](https://home.utilitas.app/guides/concrete-volume-and-bag-yield/): Translate form dimensions into concrete volume and compare bag sizes using label yield.
- [When to order ready-mix concrete](https://home.utilitas.app/guides/when-to-order-ready-mix/): Compare bag mixing with ready-mix based on volume, placement time, access, and total effort.
- [How to measure fence runs and gates](https://home.utilitas.app/guides/measure-fence-runs/): Turn a property sketch into straight runs, corners, gates, and auditable material quantities.
- [Fence post spacing explained](https://home.utilitas.app/guides/fence-post-spacing/): Understand target spacing, equalized sections, panel widths, and why field layout can change the count.

## Site information

- [About Project Quantity Lab](https://home.utilitas.app/about/): Why this free, independent home project planning site exists and how its estimates are designed.
- [Contact Project Quantity Lab](https://home.utilitas.app/contact/): Send calculator feedback, correction details, accessibility notes, or security reports.
- [Privacy](https://home.utilitas.app/privacy/): How Project Quantity Lab handles local project data, share links, logs, and future third parties.
- [Terms and estimate disclaimer](https://home.utilitas.app/terms/): Planning-estimate limitations, acceptable use, and user responsibilities.
- [Security](https://home.utilitas.app/security/): Security design, reporting channel, deployment boundary, and supported product surface.
- [Access for people and agents](https://home.utilitas.app/access/): Anonymous access, browser-local state, and the absence of accounts or a protected API.
- [Sitemap](https://home.utilitas.app/sitemap.xml): Canonical public URL inventory.

## Access and limitations

- No registration, credentials, server API, OAuth, MCP, A2A, or remote-agent endpoint exists.
- Calculator actions change browser-local state. Share links expose the encoded project inputs to anyone who receives the URL.
- Results are planning estimates and must be checked against product labels, site conditions, professional guidance, and local requirements.