Calculator categories.
Find the right calculator faster by browsing tools grouped by trade, material, measurement type, and common homeowner project. Existing calculator URLs stay unchanged.
Category quick links
Category 01
Conversions
Unit converters for weight, liquid volume, medication concentration, and material quantities.
12 tools
Weight Converter
Convert kilograms, pounds, ounces, grams, stone, and tons in one practical tool.
Open toolKnots to mph Converter
Convert knots into miles per hour, km/h, m/s, and ft/s with nautical speed context.
Open toolMillimeters to Inches Converter
Convert millimeters into inches with decimal and practical fractional inch output.
Open toolLinear Feet to Square Feet Converter
Convert linear feet into square feet by adding the width needed for a true area calculation.
Open toolCubic Feet to Cubic Yards Converter
Convert cubic feet into cubic yards with practical supporting outputs for bulk material planning.
Open toolmg to mL Calculator
Convert milligrams to milliliters using a known liquid concentration in mg/mL or mg per 5 mL.
Open toolmcg to mg Converter
Convert micrograms to milligrams, grams, and kilograms with a direct metric mass conversion.
Open toolkg to Gallons Converter
Convert kilograms to US or imperial gallons using liquid density presets or a custom kg/L value.
Open toolQuarts to Pounds Converter
Convert quarts to pounds using density-based material presets or a custom pounds-per-quart value.
Open toolGallons to Ounces Converter
Convert US or imperial gallons to fluid ounces, cups, pints, quarts, liters, and milliliters.
Open toolFeet to Inches Calculator
Convert decimal feet or mixed feet-and-inches values into inches and metric equivalents.
Open toolInches to Fraction Calculator
Convert decimal inches into common tape-measure fractions with selectable rounding precision.
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Category 02
Electrical
Electrical planning tools, including wire sizing for practical project estimates.
12 tools
Wire Size Calculator
Estimate minimum wire gauge from amp load, run length, conductor material, and voltage drop.
Open toolConduit Fill Calculator
Check raceway fill by conduit type, trade size, conductor insulation, and conductor count.
Open toolGenerator Size Calculator
Estimate generator size from running load, startup surge, phase, voltage, and extra headroom.
Open toolBattery Charge Time Calculator
Estimate recharge time from battery capacity, charger current, chemistry, efficiency, and taper allowance.
Open toolBattery Backup Calculator
Estimate battery runtime or size a practical battery bank from load watts, voltage, amp-hours, inverter efficiency, and usable discharge assumptions.
Open toolOhm's Law Calculator
Calculate voltage, current, resistance, and power from common Ohm's law input pairs.
Open toolParallel Resistor Calculator
Calculate equivalent resistance for parallel resistor networks and optional branch current and power.
Open toolPower Factor Calculator
Calculate power factor, kW, kVA, kVAR, phase angle, and estimated current from practical electrical inputs.
Open toolVoltage Divider Calculator
Calculate ideal and loaded divider output voltage, current, and resistor power from practical resistor-divider inputs.
Open toolWire Ampacity Calculator
Calculate base and adjusted wire ampacity from conductor size, material, insulation rating, ambient temperature, and conductor count.
Open toolVoltage Drop Calculator
Calculate voltage drop, delivered voltage, and percent loss for copper and aluminum wire runs.
Open toolBox Fill Calculator
Check electrical box fill from conductor counts, wire gauge, device yokes, grounds, clamps, fittings, and box volume.
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Category 03
Exterior
Fence, deck, siding, pond, paver, and outdoor improvement calculators.
14 tools
Mulch Calculator
Estimate mulch volume, cubic yards, liters, and bag count for beds, borders, and landscape areas.
Open toolTopsoil Calculator
Estimate topsoil volume, cubic yards, weight, and truckload context for grading, lawns, and planting areas.
Open toolRiver Rock Calculator
Estimate river rock coverage, cubic yards, tons, and bag count for decorative landscape beds and borders.
Open toolCrushed Stone Calculator
Estimate crushed stone volume, cubic yards, and tons for driveways, base layers, and sitework.
Open toolFencing Calculator
Estimate panels, posts, rails, and spacing for fence runs.
Open toolVinyl Fence Calculator
Estimate vinyl fence sections, posts, rails, gate deductions, and concrete bags for practical residential fence layouts.
Open toolDeck Stain Calculator
Estimate deck stain coverage for boards, railings, stairs, and multiple coats.
Open toolDecking Calculator
Estimate deck board rows, lineal footage, stock board count, and screw quantity from deck size and board layout.
Open toolSiding Calculator
Estimate siding area, openings deductions, gables, and box or bundle counts with waste.
Open toolPaver Calculator
Estimate paver count, bedding sand, base material, and edge restraint for hardscapes.
Open toolSod Calculator
Estimate sod area, pallets, rolls, and topsoil for lawn installation with waste allowance.
Open toolPotting Soil Calculator
Estimate potting soil volume and bag count for planters, pots, grow bags, and raised beds.
Open toolPond Calculator
Estimate pond volume, liner size, excavation, edging length, and pump flow for garden and koi ponds.
Open toolBaluster Calculator
Calculate baluster count, equalized spacing, center marks, and waste for deck and porch railings.
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Category 04
Finishes
Paint, wallpaper, and finish material calculators for rooms and surfaces.
4 tools
Paint Calculator
Estimate paint needed by room size, coats, and surface coverage.
Open toolWallpaper Calculator
Estimate rolls and repeat allowances for wallpapered spaces.
Open toolBoard and Batten Calculator
Estimate board count, batten count, lineal footage, wall coverage, and paintable area for board and batten layouts.
Open toolEpoxy Resin Calculator
Estimate epoxy volume for pours and coatings, including Part A and Part B mix amounts.
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Category 05
HVAC
Free calculators in the HVAC category.
6 tools
HVAC Load Calculator
Estimate heating and cooling load in BTU per hour from room size, climate, insulation, air tightness, windows, and internal heat factors.
Open toolFurnace Size Calculator
Estimate heating BTU and suggested furnace size using area, climate, insulation, and efficiency.
Open toolBTU Calculator
Estimate room cooling BTU per hour using room size, climate, insulation, sun exposure, occupants, and windows.
Open toolTonnage Calculator
Convert BTU per hour to cooling tons, convert tons to BTU, or estimate AC tonnage from area and room conditions.
Open toolCFM Calculator
Calculate airflow in CFM from room volume and air changes or from duct size and air velocity.
Open toolDuct Size Calculator
Size round or rectangular HVAC ducts from airflow and target velocity, or check velocity in an existing duct.
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Category 06
Interiors
Flooring, tile, drywall, carpet, grout, and thinset calculators for indoor projects.
6 tools
Flooring Calculator
Measure floor area and material quantities for tile, wood, or vinyl installs.
Open toolTile Calculator
Calculate tile counts, carton quantities, and coverage for floors and walls.
Open toolDrywall Calculator
Estimate drywall sheet count and coverage for walls, ceilings, and room layouts.
Open toolCarpet Calculator
Estimate carpet purchase area, roll usage, seams, and linear footage for room layouts.
Open toolThinset Calculator
Estimate thinset mortar bags for tile installs using area, trowel coverage, waste, and back-buttering allowance.
Open toolGrout Calculator
Estimate grout bags for tile installs using area, tile size, joint width, joint depth, grout type, and waste.
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Category 07
Lumber
Framing, boards, plywood, board feet, and wood material planning calculators.
6 tools
Board Foot Calculator
Calculate board feet, lumber volume, and lineal totals for hardwood and framing stock.
Open toolLumber Calculator
Plan lumber quantities for framing, decking, and structural layouts.
Open toolLog Weight Calculator
Estimate log weight, wood volume, and board-foot context from log size, species, and moisture state.
Open toolPlywood Calculator
Estimate plywood sheet counts for floor and wall sheathing with waste allowance.
Open toolFraming Calculator
Estimate wall studs, plates, headers, opening framing, sheathing sheets, and waste allowance.
Open toolFloor Joist Calculator
Estimate floor joist count, joist lineal footage, blocking, rim length, stock pieces, and subfloor sheets.
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Category 08
Masonry
Brick, mortar, and masonry material estimators for wall and repair work.
3 tools
Brick Calculator
Calculate brick counts, net wall area, and mortar volume for masonry walls.
Open toolConcrete Block Calculator
Estimate CMU block count, courses, mortar volume, and grout fill for concrete block walls.
Open toolMortar Calculator
Estimate wet and dry mortar volume plus premix bag count for masonry walls.
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Category 09
Measurements
Area, room size, square footage, cubic feet, and cubic meter calculators.
19 tools
Room Size Calculator
Measure room dimensions, usable area, and layout planning totals.
Open toolPipe Weight Calculator
Estimate pipe weight per foot, per meter, per piece, and total load from actual section dimensions and material type.
Open toolAcreage Calculator
Convert land area into acres, hectares, square feet, square meters, and other practical parcel-size units.
Open toolArch Calculator
Solve circular arch geometry from span, rise, and radius with arc length and segment area outputs.
Open toolRamp Calculator
Calculate ramp run, slope ratio, angle, ramp length, and simple landing footprint from rise and slope inputs.
Open toolRolling Offset Calculator
Calculate true offset, travel, advance, bend angle, and rolling angle for conduit, pipe, tubing, and similar layout work.
Open toolStair Calculator
Calculate stair risers, treads, stringer length, total run, angle, and tread area for practical straight stair layouts.
Open toolSpindle Speed Calculator
Calculate spindle RPM, surface speed, and feed-per-minute context from cutter diameter, material speed, flute count, and chip load.
Open toolSquare Footage Calculator
Calculate total square footage for simple and multi-room plans.
Open toolCubic Feet Calculator
Calculate cubic feet for boxes, rooms, and cylinders with cubic yard and metric conversions.
Open toolCubic Meter Calculator
Calculate cubic meters for boxes, rooms, and cylinders with liters and imperial conversions.
Open toolPipe Volume Calculator
Calculate internal pipe capacity from inside diameter or outside diameter plus wall thickness.
Open toolFlow Rate Calculator
Calculate flow rate from volume and time, fill or drain time, or pipe flow from diameter and velocity.
Open toolGallon Calculator
Estimate gallons from common tank shapes or known volume units with US and imperial gallon outputs.
Open toolMetal Weight Calculator
Estimate stock weight for plate, bar, tube, and other common metal shapes using standard or custom density.
Open toolSteel Weight Calculator
Estimate per-piece and total steel weight for plate, bar, tube, and pipe with unit-length outputs.
Open toolCubic Yard Calculator
Calculate cubic yards for bulk materials using rectangular, circular, triangular, or area-depth measurements.
Open toolSquare Yards Calculator
Convert measured area into square yards using rectangle, triangle, circle, or known-area inputs.
Open toolTank Volume Calculator
Calculate full tank capacity and current fill volume for cylindrical, rectangular, and elliptical tanks.
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Category 10
Pools
Pool volume, pool chemical, pond, and water feature planning calculators.
3 tools
Pool Calculator
Plan volume, excavation, liner area, perimeter, and surrounding deck takeoffs for common pool shapes.
Open toolPool Volume Calculator
Calculate pool volume for rectangle, circular, and oval pools with flat or sloped depths.
Open toolPool Chemical Calculator
Estimate chlorine, pH, alkalinity, calcium, stabilizer, and salt dosing from pool volume.
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Category 11
Roofing
Roof pitch and roofing material calculators for planning roof projects.
5 tools
Roofing Cost Estimator
Estimate roof squares, bundles, underlayment, and material-only totals from your own pricing inputs.
Open toolRoof Pitch Calculator
Convert rise, run, span, and angle into pitch ratio, slope %, and rafter length.
Open toolRafter Length Calculator
Calculate common rafter length, overhang tail, cut length, and roof angle from pitch and span.
Open toolRoof Shingle Calculator
Estimate roofing squares, shingle bundles, starter, ridge cap, and underlayment for simple roofs.
Open toolRoof Truss Calculator
Estimate roof truss span geometry, top chord, bottom chord, heel height, and roof area per truss bay.
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Category 12
Sitework
Concrete, gravel, sand, asphalt, retaining wall, paver, and bulk material tools.
8 tools
Concrete Calculator
Work out slab, footing, and column volume for concrete pours.
Open toolGravel Calculator
Figure out gravel volume, depth, and tonnage for paths or pads.
Open toolRoad Base Calculator
Estimate road base volume, cubic yards, and tons for driveways, pads, access roads, and compacted support layers.
Open toolSand Calculator
Estimate sand volume, weight, and bag count for bedding, fill, and site prep.
Open toolAsphalt Calculator
Estimate asphalt tonnage, compacted volume, and truckloads for driveways and paved areas.
Open toolCubic Yards to Tons Calculator
Convert cubic yards to tons for gravel, sand, soil, asphalt, mulch, and other bulk materials.
Open toolSonotube Calculator
Estimate concrete volume, bag counts, and yardage for round pier forms and optional belled bases.
Open toolRetaining Wall Calculator
Estimate retaining wall blocks, caps, base gravel, drainage stone, pipe, fabric, and optional geogrid.
Open tool
Category 13
Structural
Reinforcement and structural material calculators for practical planning.
1 tool