calcs.homes

All calculators

Every free calculator on calcs.homes, in one place. More categories ship every week.

Measuring & volume

Square Footage Calculator
Find the square footage of any room or lot — rectangle, circle, or triangle.
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Cubic Yard Calculator
Convert any length, width, and depth into cubic yards of material.
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Volume Calculator
Interior volume of a box or cylinder, shown in cu ft, cu yd, and gallons.
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Cubic Feet Calculator
Cubic feet from your dimensions, plus a quick cu ft ⇄ sq ft mode.
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Circle Calculator
Solve for a circle's diameter, radius, circumference, or area.
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Square Meters Calculator
Sq m from dimensions, or a direct sq ft ⇄ sq m converter.
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Concrete & masonry

Concrete CalculatorPopular
Bags, cubic yards, and cost for a slab, footing, or column.
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Gravel Calculator
Tons of gravel or crushed stone needed for a driveway or path.
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Dirt Calculator
Fill dirt volume, weight, and cost, with a compaction allowance.
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Paver Calculator
Paver count and gravel base material for a patio or walkway.
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Asphalt Calculator
Tons of asphalt and cost for a driveway.
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Stone Calculator
Tons of fieldstone, flagstone, river rock, or limestone.
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Retaining Wall Calculator
Block count and gravel base material for a retaining wall.
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Cinder Block Calculator
Cinder block count and mortar bags for a wall.
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Deck Footing Calculator
Concrete needed for deck post footings.
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Brick Calculator
Brick count and mortar bags for a single-wythe wall.
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Mortar Calculator
Mortar bags needed for a block or brick count.
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Sand Calculator
Tons of sand for a paver base, play area, or leveling layer.
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Countertop Calculator
Granite or quartz square footage and material cost.
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Rip Rap Calculator
Tons of rip rap for embankment or drainage erosion control.
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Aggregate Calculator
Compacted base material with a custom density option.
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Concrete Stair Calculator
Concrete volume for a solid stepped stair pour.
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Lumber & framing

Stair Calculator
Riser height, number of risers, total run, and stringer length.
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Board Foot Calculator
Board feet and cost from thickness, width, and length.
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Deck CalculatorPopular
Decking boards needed and material cost for any deck size.
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Fence Calculator
Posts, pickets, and cost for a fence line.
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Siding Calculator
Siding squares needed and cost, minus windows and doors.
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Stud Calculator
Wall framing stud count, including corners and openings.
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Lumber Calculator
Boards needed and cost from total linear footage.
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Baluster Spacing Calculator
Deck and stair railing baluster count and code-compliant spacing.
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Slope Calculator
Rise over run as an angle, percent grade, and ratio.
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Ramp Calculator
ADA-compliant ramp length and landing requirements.
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Shelf Span Calculator (Sagulator)
Estimate shelf sag from material, thickness, span, and load.
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Epoxy Resin Calculator
Resin and hardener amounts for a tabletop or river table pour.
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Deck Load Calculator
Total design load and estimated occupancy for a deck.
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Insulation

Blown-In Insulation Calculator
Bags, depth, and cost to reach a target attic R-value.
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R-Value Calculator
Total wall or ceiling assembly R-value from its layers.
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Pool & spa

Pool Gallons Calculator
Quick gallons for a rectangle, round, oval, or kidney pool.
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Pool Volume Calculator
Full volume with a sloped deep end, or an above-ground preset.
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Pool Chemical CalculatorAll-in-one
Dosing for chlorine, alkalinity, calcium, stabilizer, or salt in one tool.
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Pool pH Calculator
Soda ash or muriatic acid dose to hit your target pH.
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Pool Salt Calculator
Pounds of salt to hit your saltwater chlorinator's target.
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Pool Alkalinity Calculator
Raise or lower total alkalinity with baking soda or acid.
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Muriatic Acid Pool Calculator
Acid dose for either pH or total alkalinity adjustment.
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Pool Shock Calculator
Shock dose for routine maintenance, algae, or heavy recovery.
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Pool Chlorine Calculator
Raise free chlorine ppm with liquid or granular product.
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Baking Soda Calculator
Raise total alkalinity with plain baking soda.
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Pool LSI Calculator
Langelier Saturation Index — is your water balanced?
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Cyanuric Acid Calculator
Raise stabilizer / conditioner (CYA) level.
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Calcium Chloride Calculator
Raise calcium hardness to protect plaster and equipment.
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Pool Pump Size Calculator
Flow rate needed and a recommended pump horsepower.
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Pool Heater Size Calculator
BTU sizing from surface area and desired temperature rise.
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Pool Pump Run Time Calculator
How many hours a day to run your pump.
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Pool Evaporation Calculator
Daily and weekly water loss from evaporation.
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Pool Pump Electricity Cost Calculator
What running your pump actually costs, monthly and yearly.
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Electrical & utilities

kWh / Electricity Cost Calculator
Daily, monthly, and yearly running cost for any appliance.
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Solar Panel Calculator
How many solar panels you need to cover your usage.
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Solar Cost Calculator
Net system cost after your incentive or tax credit rate.
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Electrical Load Calculator
NEC-style home service size, Optional Method.
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Wire Size / Gauge Calculator
Wire size by ampacity and voltage drop.
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CFM Calculator
Exhaust fan sizing for a bathroom, kitchen, or laundry room.
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Ceiling Fan Size Calculator
Right blade span for your room's square footage.
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Whole House Fan Size & CFM Calculator
Fan sizing for attic-vented whole-home cooling.
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Conduit Bending Calculator
Offset bend marks and shrinkage for EMT conduit.
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Utilities Calculator
Rough monthly estimate for electric, gas, water, and more.
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Home insurance

Home Insurance Calculator
Rebuild cost estimate, plus personal property and other structures coverage.
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Roofing

Roof Pitch CalculatorPopular
Pitch as x-in-12, roof angle, slope percent, and slope factor.
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Roof Area Calculator
Total roof surface area and roofing squares from footprint and pitch.
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Shingle Calculator
Squares, bundles of shingles, and material cost from roof area.
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Rafter Length Calculator
Common rafter length, overhang tail, and total board length by pitch.
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Metal Roof Panel Calculator
Panels, linear feet, and cost for a standing-seam or corrugated roof.
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Roof Truss Calculator
Truss count for a given length and on-center spacing, plus cost.
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Roof Ventilation Calculator
Net free area, balanced intake/exhaust, and ridge vent length.
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Gutter & Downspout Calculator
Downspout count and gutter slope for a roof drainage area.
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Flooring & tile

Tile CalculatorPopular
How many tiles you need with waste, plus coverage and cost.
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Flooring Cost Calculator
Material and labor estimate by flooring type and area.
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Carpet Calculator
Square yards of carpet, roll length, and installed cost.
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Laminate Flooring Calculator
Boxes of laminate or vinyl plank needed, with waste and cost.
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Thinset Calculator
50-lb bags of thinset mortar from tile area and trowel size.
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Grout Calculator
Pounds and bags of grout from tile size, joint width, and area.
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Square Feet to Linear Feet Calculator
Convert an area to linear feet of board or plank, with piece count.
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Self-Leveling Concrete Calculator
Bags of self-leveling underlayment from area and average depth.
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Paint & drywall

Paint CalculatorPopular
Gallons of paint for a room, with paintable area and cost.
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Wall Square Footage Calculator
Gross and net wall area from room size, height, and openings.
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Drywall Calculator
Sheets of drywall, screws, and cost from wall and ceiling area.
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Drywall Mud Calculator
Gallons and buckets of joint compound by area and finish level.
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Wallpaper Calculator
Rolls of wallpaper for a room, allowing for pattern repeat.
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Primer Calculator
Gallons of primer by area, coats, and surface type.
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Board and Batten Calculator
Even batten count, exact gap, and linear feet for an accent wall.
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House Painting Cost Calculator
Rough exterior repaint cost by size, stories, grade, and prep.
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HVAC — heating & cooling

BTU CalculatorPopular
Cooling BTU per hour and AC size from room size and conditions.
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AC Tonnage Calculator
Central AC size in tons and BTU from home size and climate.
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Mini Split Sizing Calculator
BTU load and nearest ductless mini-split head size for a room.
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Furnace Size Calculator
Heating BTU output and input rating from home size and climate.
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Heat Pump Size Calculator
Heat pump tons and BTU, with a rough cold-climate backup figure.
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SEER Savings Calculator
Yearly and 10-year savings from upgrading to a higher-SEER AC.
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Heating BTU Calculator
Garage / shop heater size in BTU and watts by volume and temp rise.
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Generator Sizing Calculator
Continuous and peak watts, and the generator size to buy.
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Everyday & hobby

Markup Calculator
Selling price, markup %, and margin % from any two of the three.
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Aquarium Calculator
Tank volume in gallons or liters, plus water weight.
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Dilution Ratio Calculator
Exact concentrate and water amounts for any ratio.
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Plant Spacing Calculator
How many plants fit a garden bed, laid out in rows.
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Circle Skirt Calculator
Waist radius, hem radius, and fabric width for sewing.
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Flag Calculator
A well-proportioned flag size for your flagpole height.
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Kitchen Remodel Cost CalculatorPopular
A rough budget range by kitchen size and finish tier.
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TV Mounting Height Calculator
Ideal mount height plus top and bottom edges.
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Desk Height Calculator
Ergonomic seated desk and chair seat height.
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Standing Desk Height Calculator
Standing desk height and monitor eye-level position.
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Fabric Calculator
Yardage needed from area and fabric bolt width.
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Will It Fit Through the Door?
Check furniture against a doorway, straight or at an angle.
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Furniture Resale Value Calculator
Depreciated resale value from price, age, and condition.
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Room Size Calculator
Square footage and how it compares to typical room sizes.
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Bean Bag Filler Calculator
Filler volume needed to refill or top off a bean bag.
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Ring Size Calculator
US ring size from a finger circumference or diameter measurement.
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Shoelace Length Calculator
Right lace length by eyelet count and lacing style.
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