862 calculators · every formula source-cited

Construction maths,
done properly.

Concrete, framing, roofing, drywall and MEP quantities — with the formula and the standard behind every number. Imperial and metric. Free, and it runs entirely on your device.

  • Cited formulas & standards
  • Works offline
  • Nothing leaves your device

Browse by trade

Renovation & Construction

Paint, flooring, drywall, concrete, framing, and general remodeling estimators.

All 59 tools

Electrical

Wire sizing, circuit load, breaker, and outlet-count calculators.

All 31 tools

Plumbing & HVAC

Pipe sizing, water heater capacity, BTU load, and ventilation calculators.

All 39 tools

Insulation & Efficiency

R-value, insulation quantity, and energy-savings estimators.

All 23 tools

Materials & Quantities

Concrete, gravel, mulch, brick, and tile quantity calculators.

All 572 tools

Financial-Adjacent

Project cost, material cost, and labor-hour estimators — arithmetic only, not financial advice.

All 38 tools

Measurements & Conversions

Construction-specific unit conversions and measurement helpers.

All 52 tools

Auto/Utility

Driveway, fencing, and other outdoor/utility project calculators.

All 26 tools

Landscaping & Outdoor

Soil, mulch, turf, irrigation, paving and hardscape quantities for gardens, yards and grounds.

All 6 tools

Pools & Water Features

Pool volume, chemical dosing, circulation, heating and covers — plus liners and water storage.

All 4 tools

Solar & Energy Storage

Array sizing, inverters, battery banks, off-grid autonomy and standby generation.

All 3 tools

Sustainability & Compliance

Embodied carbon, recycled content, waste diversion and stormwater — the figures green rating schemes and public tenders ask for.

All 5 tools

Heavy Civil & Infrastructure

Pavement design, deep excavation support, piling, cranes and the project controls that govern them.

All 4 tools