Every calculator
All 1151 construction calculators
Grouped into 13 subjects. Every one shows the formula it used and cites the standard behind it, works in imperial or metric, and runs entirely in your browser — nothing you type is uploaded. Results can be collected into a project and exported as a priced bill of materials. Looking for work rather than subjects? The same calculators by trade.
- 13Categories
- 1151Calculators
Where most jobs start
Renovation & Construction
Paint, flooring, drywall, concrete, framing, and general remodeling estimators.
- Kitchen Unit and Cabinet Run Calculator
- Floor Sanding and Finish Calculator
- Wallpaper Calculator
- Miter Angle Calculator — Mitre Saw Corners, Frames and Crown
- Stair Rise & Run Calculator
- Drywall Finish Level Compound Calculator
Electrical
Wire sizing, circuit load, breaker, and outlet-count calculators.
- Electrical Box Fill Calculator (NEC 314.16, US)
- Cable Voltage Drop Calculator (mm², Copper or Aluminium)
- Copper to Aluminum Wire Size Calculator (Aluminium Equivalent, AWG and mm²)
- Wire Gauge Voltage Drop Calculator (Copper or Aluminum, AWG to 1,000 kcmil)
- Watts, Amps and kVA Calculator (Any Voltage, AC or DC)
- Single-Phase Motor Full-Load Current Calculator (Amps from hp or kW)
Plumbing & HVAC
Pipe sizing, water heater capacity, BTU load, and ventilation calculators.
- Room Heat Loss and Radiator Size Calculator (Watts and BTU)
- Range Hood and Cooker Hood Airflow Calculator (CFM, L/s and Make-Up Air)
- Rainwater Tank and Cistern Size Calculator
- Gas Pipe Sizing Calculator (Longest-Length Method)
- Radiator Output at Lower Flow Temperature (ΔT Correction) Calculator
- Air Conditioner Size Calculator
Insulation & Efficiency
R-value, insulation quantity, and energy-savings estimators.
- Insulation R-Value by Climate Zone Calculator (IECC 2021 and NBC 2020)
- Attic and Loft Ventilation Calculator (Intake, Exhaust and Vent Count)
- Surface Temperature Factor (fRsi) Calculator (BS EN ISO 13788, BRE IP 1/06)
- Electric Underfloor Heating Mat Area Calculator
- Insulation Thickness for a Target U-Value Calculator (BS EN ISO 6946)
- Attic Bypass Sealing Material Calculator
Materials & Quantities
Concrete, gravel, mulch, brick, and tile quantity calculators.
- Lumber Weight Calculator — Timber Weight by Species and Moisture
- Tank Volume Calculator (Litres and Gallons at Any Depth)
- Roof Tile and Slate Calculator (Gauge, Battens and Ridge Tiles)
- Lime Mortar Mix Calculator (NHL and Lime Putty)
- Cavity Wall & Stud Bay Insulation Fill Calculator
- Floor Screed Calculator — Sand and Cement, Bagged or Liquid
Financial-Adjacent
Project cost, material cost, labor-hour and programme estimators — arithmetic only, not financial advice.
- Critical Path and Float Calculator (CPM)
- UK Stamp Duty (SDLT) Calculator
- Working Days to Finish Calculator
- Ontario Land Transfer Tax Calculator
- Repetition Learning Curve Calculator (Wright and Crawford)
- Delay Cost and Acceleration Break-Even Calculator
Measurements & Conversions
Construction-specific unit conversions and measurement helpers.
- Drawing Scale Calculator (Plan to Real Size and Back)
- Triangle Calculator — Right Triangle and Any Triangle Solver
- Decimal Inches to Fraction Calculator (and Fraction to Decimal)
- Feet and Inches Calculator (Add, Subtract, Multiply, Divide)
- Court Diagonal and Squaring Triangle Calculator
- Equal Spacing Calculator (Balusters or Spindles, Posts, Battens)
Auto/Utility
Driveway, fencing, and other outdoor/utility project calculators.
- Accessible Parking Space Count Calculator
- MPG to Litres per 100 km Calculator
- Skip & Dumpster Size Calculator
- Driveway Separation Geotextile Roll Calculator
- Asphalt Driveway Calculator
- Concrete Driveway Calculator
Landscaping & Outdoor
Soil, mulch, turf, irrigation, paving and hardscape quantities for gardens, yards and grounds.
- Fence Panel and Post Calculator (Lap, Closeboard and Privacy Panels)
- Gabion Basket and Stone Calculator
- Artificial Grass and Synthetic Turf Calculator
- Pond Volume and Liner Size Calculator
- Sleeper Retaining Wall Calculator (Sleepers, Steel Posts and Post Concrete)
- Plant Spacing Calculator (Plants per Bed or Row, Square or Triangular)
Pools & Water Features
Pool volume, chemical dosing, circulation, heating and covers — plus liners and water storage.
- Pool Volume Calculator (Rectangular, Round, Oval or Kidney)
- Pool Calcium Hardness Increaser Calculator
- Pool pH Adjustment Calculator (Acid or Soda Ash)
- Pool Stabilizer (Cyanuric Acid) Calculator
- Pool Total Alkalinity Adjustment Calculator
- Pool Cover & Liner Area Calculator
Solar & Energy Storage
Array sizing, inverters, battery banks, off-grid autonomy, PV wiring and payback.
- Battery Bank Sizing Calculator
- Off-Grid Autonomy Calculator
- Solar Array Row Spacing and Shading Pitch Calculator
- Solar Inverter Sizing Calculator
- Solar Water Heater Collector Size Calculator
- Solar Water Heater Savings Calculator
Sustainability & Compliance
Embodied carbon, recycled content, waste diversion and stormwater, and the noise, vibration, exposure and welfare figures a site is held to.
- Construction Plant Noise at a Neighbour Calculator (BS 5228-1 / FHWA RCNM)
- Daily Noise Exposure (LEP,d) Calculator
- OSHA Noise Dose and 8-Hour TWA Calculator
- Embodied Carbon in Concrete Calculator
- Hand-Arm Vibration Exposure (A(8)) and Points Calculator
- Hearing Protection Attenuation Calculator (SNR, HML, NRR)
Heavy Civil & Infrastructure
Pavement design, deep excavation support, piling, cranes and the project controls that govern them.
- Trench Sloping & Excavation Width Calculator
- Pavement Design ESAL Calculator
- Crane Lift Utilisation Calculator
- Driveway Throat Queue Length Calculator
- Erosion Control Blanket Roll and Staple Calculator
- Pile Group Block Failure Calculator (Clay)
Not a calculation yet?
- Job takeoffsone job, every trade at once
- Trade guideshow the work is actually done
- Comparisonsthe choice before the calculation
- Methodologythe equations, derived in full
- Field toolsmeasure with the phone in your hand