Air Purifier Size Calculator
Required smoke CADR and wildfire rating from room area.
Home and DIY
Concrete, paint, and other project quantities for houses and gardens.
Asphalt Calculator
Blacktop tons, volume, and area from length, width, and depth in both systems.
Attic Vent Calculator
Required net free vent area split between soffit and ridge vents.
Bathroom Fan Size Calculator
Bath fan CFM from room size or fixtures, HVI method.
Board Feet Calculator
Lumber volume in board feet from thickness, width, length, and piece count.
Brick Calculator
Brick count and cost for walls from area.
BTU Calculator for Room AC Size
Right air conditioner size in BTU and tons from room area and conditions.
Carpet Calculator
Carpet square feet, square yards, and cost with waste.
Ceiling Fan Size Calculator
Ceiling fan diameter from room length and width.
Chimney Flue Size Calculator
Chimney flue size from fireplace opening per IRC ratios, with stock liner picks.
Christmas Lights Power Calculator
Holiday light season cost from bulb type, hours, and electric rate.
Circuit Breaker Load Calculator
Safe continuous watts for any breaker at 120 or 240 volts.
CO Alarm Calculator
CO alarm count, placement, and replace date.
Concrete Block Calculator
CMU blocks and cost for walls from area.
Concrete Calculator
Cubic yards, bag count, and cost for slabs from length, width, and thickness.
Concrete Cure Time Calculator
Cure percent, traffic verdict, and guidance from slab age.
Concrete Strength Calculator
Cylinder break strength in psi or MPa.
Cylinder Volume Calculator
Tank, well, and pipe volume in liters and gallons from diameter and height.
Deck Boards Calculator
Deck boards, screws, and area from deck size and board width.
Dehumidifier Size Calculator
Minimum pints per day from room size and dampness, per ENERGY STAR.
Door Clearance Calculator
Door clear opening and code pass check.
Drip Irrigation Runtime Calculator
Weekly drip hours from need, heads, and flow.
Dryer Vent Length Calculator
Dryer vent effective length vs 35 ft code max.
Drywall Calculator
Sheets, screws, and cost for walls and ceilings from area.
Egress Window Calculator
Egress opening area and code verdict.
Electricity Cost Calculator
Monthly kWh and cost for any device from watts, hours, and your rate.
Extension Cord Size Calculator
Minimum AWG cord gauge from tool amps and cord length.
Fence Calculator
Pickets, posts, and rails for a privacy fence from length and picket size.
Fence Stain Calculator
Fence stain gallons per coat and two-coat total.
Fire Extinguisher Calculator
Extinguisher A-units and count from floor area, NFPA 10.
Firewood Calculator
Cords, face cords, and cost from stack dimensions.
Firewood Heat Calculator
Cord heat in BTU, kWh, and propane gallons.
French Drain Calculator
Gravel yards and pipe feet from trench size.
Garden Lime Calculator
Limestone pounds, bags, and split timing from pH gap and texture.
Grab Bar Size Calculator
Grab bar minimums by wall with height.
Grass Seed Calculator
Seed pounds, bags to buy, and rate used from lawn area, grass type, and job.
Gravel Calculator
Tons and cubic yards of gravel for driveways and paths.
Grout Calculator
Grout volume from tile size and joint width, with order quantity.
Gutter and Downspout Calculator
Gutter feet, downspout and elbow counts from eaves.
Home Generator Size Calculator
Generator kW class from appliance running watts and motor surge.
Humidifier Size Calculator
Humidifier gallons per day from home size and tightness.
Insulation Calculator
Packs needed and cost to insulate any attic, wall, or floor area.
Kitchen Outlet Calculator
Kitchen receptacle count and GFCI rules.
Laminate Flooring Calculator
Flooring boxes needed from room size, waste allowance, and box coverage.
Lawn Fertilizer Calculator
Nitrogen, product, and bags from lawn area and feed rate.
Lawn Mowing Time Calculator
Cutting minutes from lawn size and mower pace.
Lawn Overseeding Calculator
Overseed pounds, bags, and cost from lawn area.
Lawn Watering Calculator
Gallons and sprinkler minutes from lawn area, inches, flow, and days.
LED Savings Calculator
Yearly dollars and kWh saved by swapping bulbs to LED.
Light Bulb Replacement Calculator
Turn bulb count, daily hours, and bulb life into yearly hours and replacements.
Lighting Lumens Calculator
Lumens and bulbs needed for any room from IES levels.
MERV Filter Calculator
What each MERV rating captures, smoke suitability, and upgrade advice.
Mosquito Dunk Calculator
Bti dunk count and schedule from water area.
Mulch and Soil Calculator
Cubic yards and bag count for garden beds from length, width, and depth.
Paint Calculator
Gallons and cost for walls from size, coats, coverage, and openings.
Patio Slope Calculator
Patio fall from run length at 1 to 2 percent.
Paver Calculator
Paver count, rate per area, and waste allowance from patio size and paver size.
Plant Spacing Calculator
Plants, staggered count, and trays from bed area and spacing.
Playground Mulch Calculator
Safety surfacing yards, maintained depth, and fall verdict from area and material.
Pond Liner Calculator
Liner sheet size and area from pond size.
Pond Volume Calculator
Pond gallons, liters, and surface from shape and dimensions.
Pool Pump Runtime Calculator
Pump hours for one and two pool turnovers.
Pool Volume Calculator
Gallons or liters, water weight, and surface for rectangular and round pools.
Post Hole Concrete Calculator
Concrete volume and bags for round post holes and footings.
Radon Level Calculator
Radon average, unit conversion, and fix guidance from one or two home tests.
Rain Garden Size Calculator
Rain garden area and storage from roof drainage with shape suggestion.
Rainwater Collection Calculator
Harvest gallons from roof area, rainfall, and efficiency.
Raised Bed Soil Calculator
Soil volume, bag count, and compost share for any raised bed.
Range Hood CFM Calculator
Range hood CFM from burners and width with makeup air guidance.
Rebar Calculator
Bar count, total length, and sticks for slab grids.
Recessed Light Spacing Calculator
Can light spacing, wall gap, and count from room size.
Ridge Vent Calculator
Attic vent NFA with soffit/ridge split.
Roofing Calculator
Roof area, squares, bundles, and cost from footprint and pitch.
Room Air Changes Calculator
ACH and minutes per change from volume and flow.
Sandbag Calculator
Turn doorways, bags per row, and rows into bag totals and next row extras.
Septic Drainfield Calculator
Drainfield flow, area, and trench length from bedrooms and soil.
Septic Tank Size Calculator
Tank gallons, dimensions, and daily flow from bedroom count.
Siding Calculator
Siding squares and cost for house walls from area.
Smoke Detector Count Calculator
Alarm count from bedrooms and levels.
Snow Load Calculator
Roof snow load, total weight, and watch verdict from depth, ratio, and area.
Sod Calculator
Sod rolls, pallets, and cost for lawns from area.
Solar Panel Output Calculator
Daily and monthly kWh plus bill savings from system size and sun hours.
Space Heater Size Calculator
Heater watts, count, and amps from room area.
Sprinkler Spacing Calculator
Sprinkler precipitation rate and minutes from flow, area, and target depth.
Square Footage Calculator
Area in square feet, square meters, and acres from length and width.
Stair Calculator
Steps, riser height, run, and stringer length from total rise.
Stormwater Runoff Calculator
Roof and yard runoff gallons from rain depth.
Sump Pump Sizing Calculator
Pit gallons and empty time from pit size and pump rate.
Thermostat Savings Calculator
Yearly dollars saved by setting back degrees and hours.
Tile Calculator
Tiles, boxes, and cost for floors and walls from area and tile size.
Toilet Water Savings Calculator
Gallons and dollars saved swapping old toilets for 1.28 gpf.
Wall Stud Calculator
Stud count and plate length for 16 or 24 in on-center walls.
Wallpaper Calculator
Strips and rolls for walls from room size, roll size, and pattern repeat.
Water Filter Life Calculator
Turn gallons used and filter rating into percent used and days left.
Water Heater Size Calculator
Tank gallons and daily use from household size.
Water Softener Size Calculator
Softener grains per day, regen days, and salt per cycle.
Well Pressure Tank Calculator
Drawdown gallons and precharge from tank size.
Wheelchair Ramp Calculator
Ramp length and runs for any rise at 1:12 accessible slope.
Whole House Fan Size Calculator
Whole house fan CFM, vent, and window area.
Window Heat Loss Calculator
Glass heat loss from U, area, and gap.