Construction Trade Calculators
Built for the Job Site

Calculate concrete needed in cubic yards and bags for slabs, footings, and columns. Includes waste factor and cost estimates.

Calculate stair rise, run, number of treads, total height, and stringer length. Checks against IRC building code requirements.

Calculate the correct wire gauge for a circuit based on amps, distance, voltage, phase, and maximum voltage drop per NEC standards.

Calculate the BTU cooling or heating load for a room based on square footage, insulation, sun exposure, occupants, and climate zone.

Calculate sheets of drywall, joint compound, tape, and screws needed for walls and ceilings. Accounts for doors, windows, and waste.

Calculate roof pitch, angle, and slope from rise and run measurements. Convert between pitch ratios, degrees, and percentages.

Calculate gallons of paint needed for walls, ceilings, and trim. Accounts for doors, windows, number of coats, and surface texture.

Calculate cubic yards, bags, and estimated weight of mulch, gravel, topsoil, or sand needed for a given area and depth.

Calculate insulation R-value needs, square footage, and material quantities for walls, attics, and crawlspaces by climate zone.

Calculate voltage drop for a given wire gauge, distance, and load. Shows voltage at the load and NEC compliance status.

Calculate posts, rails, pickets, and concrete needed for fence installation. Supports privacy, picket, ranch, and chain link styles.

Calculate number of bricks, mortar bags, and sand needed for walls, patios, and veneers. Supports standard, modular, and queen sizes.

Calculate number of pavers, base gravel, and sand needed for a patio or walkway. Supports common sizes and patterns.

Calculate the right water heater size based on number of bathrooms, people, and fixtures. Supports tank and tankless systems.

Calculate the correct circuit breaker size and wire pairing for a given load per NEC standards. Handles continuous, non-continuous, and motor loads.

Calculate minimum conduit size based on number and size of conductors per NEC Chapter 9 fill requirements.

Calculate board feet from lumber dimensions. Convert between nominal and actual sizes, estimate costs per board foot for hardwood and softwood.

Calculate number of tiles, thinset, and grout needed for floors and walls. Supports custom tile sizes, patterns, and waste factors.

Get recommended MIG welder settings — voltage, wire feed speed, and gas flow — for carbon steel, stainless, and aluminum by material thickness.

Calculate how many sod pieces, rolls, or pallets you need for a given area. Includes waste factor and cost range.

Calculate the minimum pipe diameter for a given flow rate and maximum velocity. Supports copper, PEX, CPVC, and PVC.

Calculate the correct duct diameter for a given CFM and velocity. Includes equivalent rectangular duct sizing.

Calculate total electrical service load per NEC Article 220. Determine the right service panel size for residential installations.

Calculate heating BTU requirements for winter based on square footage, insulation, windows, exterior walls, and climate zone.

Calculate required drain slope and total drop based on pipe diameter and run length per IPC/UPC code requirements.

Calculate pressure loss from elevation changes, pipe friction, and fittings. Determine available pressure at the fixture.

Calculate rebar quantity, spacing, and weight for slabs, footings, and walls. Includes lap splice lengths and total linear footage.

Calculate recommended TIG welding amperage, tungsten size, filler rod, cup size, and gas flow based on material type and thickness.

Compare energy costs between two SEER ratings. Calculate annual savings, 10-year savings, and payback period for an HVAC upgrade.

Calculate blocks, cap units, backfill gravel, and base material needed for a segmental retaining wall by height and length.

Calculate the minimum electrical box size per NEC 314.16 based on conductor count, grounds, clamps, and devices.

Calculate additional refrigerant charge needed based on line set length for R-410A, R-22, and R-32 systems.

Calculate room ventilation CFM requirements per ASHRAE 62.1 and 62.2 standards for residential and commercial spaces.

Calculate water flow rate from pipe diameter and velocity, or velocity from flow rate and diameter. Includes Reynolds number and flow type.

Calculate cut and fill volumes for site grading projects. Estimates truck loads and accounts for soil compaction and swell factors.

Calculate welding heat input in kJ/in from voltage, amperage, and travel speed. Includes process efficiency factors for SMAW, GMAW, GTAW, FCAW, and SAW.

Calculate recommended shielding gas flow rate and tank duration for MIG and TIG welding based on nozzle/cup size and conditions.

Count drainage and water supply fixture units (DFU/WSFU) to size drain and supply lines per plumbing code.

Calculate filler metal weight and quantity needed for butt, fillet, and V-groove weld joints based on dimensions and material.

Estimate the total cost per weld including labor, filler metal, shielding gas, and electricity for any welding process.