20 free calculators

Tools for the project in front of you.

Calculate materials, waste, purchase quantities and optional costs. Every tool includes its method, assumptions, a worked example and clear planning limits.

20
live toolsAll free · no sign-up

Paint & Finishing

2 calculators

Plan coatings and wall finishes from the surfaces being covered, not from room size alone. Coverage rate, coats, pattern repeat and package size can all change the shopping quantity.

Use the actual product label whenever possible, especially for paint coverage and wallpaper roll dimensions.

Floors & Walls

5 calculators

Turn room dimensions into tiles, flooring packs, drywall sheets, grout and trim. The key planning step is separating theoretical area from waste-adjusted and package-rounded purchase quantities.

Layout complexity, openings, offcuts and stock lengths can make two projects with the same area use different amounts of material.

Construction

5 calculators

Estimate concrete, masonry, roofing, siding and insulation quantities using transparent geometry and product-specific coverage inputs.

These tools estimate material quantity only. Structural adequacy, code compliance, reinforcement and building-envelope design require separate project decisions.

Outdoor

6 calculators

Plan landscaping and exterior projects using area, depth, spacing and linear measurements. Gravel, mulch, soil, pavers, fencing and decking all convert dimensions into different purchase units.

Ground conditions, drainage, compaction, foundations and structural framing are outside a simple quantity estimate and may require additional planning.

Energy

2 calculators

Estimate a room AC capacity starting point and model appliance running costs from power, usage and your own electricity rate.

Energy and HVAC results are scenario estimates. Whole-building load calculations, electrical suitability and tariffs with complex charging structures need more detailed assessment.
Transparent calculations

See what the number means before you use it.

PlanCalq publishes calculation logic, assumptions, worked examples and limitations alongside the calculators. Product labels and local project requirements still take precedence where they provide more specific information.

Read methodology & editorial standards →