Home & Garden Calculators Comparison
All 52 Home & Garden calculators in one comparison table, with the formula and a worked example for each.
What you can work out with these calculators
Home and garden calculators turn room and plot measurements into quantities and costs: paint and wallpaper, lighting, air-conditioning capacity, soil volume and DIY material estimates. They follow standard estimating practice with waste allowances shown separately, so you order once rather than twice.
- Work out paint litres from wall area, number of coats and coverage per litre.
- Estimate wallpaper rolls from room dimensions and pattern repeat.
- Size a room air conditioner from floor area, ceiling height and sun exposure.
- Calculate soil or mulch volume for beds from area and depth.
Compare calculators by what you enter
All 52 calculators here, one row each: what each tool works out and the fields it asks for before it does. Open any row to use the calculator itself.
| Calculator | What it works out | What you enter |
|---|---|---|
| Room Area & Flooring Calculator | Calculate room area and flooring materials needed | Length (ft) · Width (ft) · Waste % |
| Wallpaper Rolls Needed Calculator | Calculate wallpaper rolls required for a room | Total Wall Width (ft) · Ceiling Height (ft) · Roll Width (inches) · Roll Length (ft) |
| Fence Material Calculator | Calculate fence posts, rails, and pickets needed | Perimeter (ft) · Fence Height (ft) · Post Spacing (ft) |
| Deck Stain & Sealant Calculator | Calculate deck stain or sealant needed | Deck Length (ft) · Deck Width (ft) · Number of Coats |
| Curtain Length & Fabric Calculator | Calculate curtain panel length and fabric yardage | Window Width (inches) · Window Height (inches) · Fullness Factor · Rod Above Window (inches) |
| Rug Size & Room Fit Calculator | Find the right rug size for any room | Room Length (ft) · Room Width (ft) · Furniture Clearance (inches) |
| Room Lighting Needs Calculator | Calculate lumens and bulbs needed for a room | Room Length (ft) · Room Width (ft) · Ceiling Height (ft) · Room Type |
| Paint Cost Estimator | Estimate total paint cost for a room or house | Total Sq Ft · Gallons Needed · Price per Gallon ($) · Primer Needed? · DIY Hours |
| AC/BTU Size Calculator | Calculate the right AC BTU size for a room | Room Length (ft) · Room Width (ft) · Ceiling Height (ft) · Sunlight Exposure · People in Room |
| Water Heater Size Calculator | Find the right water heater size for your home | Showers per Hour · Dishwashers per Day · Laundry per Day · Bathrooms · Temp Rise Needed (°F) |
| Generator Size Calculator | Calculate generator wattage needed for your home | Refrigerator (W) · AC Unit (W) · Lights (W) · TV/Electronics (W) · Water Pump (W) |
| Garden Soil & Mulch Calculator | Calculate soil, mulch, or compost needed for garden beds | Bed Length (ft) · Bed Width (ft) · Depth (inches) |
| Plant Spacing & Quantity Calculator | Calculate plants needed for a garden bed with proper spacing | Bed Length (ft) · Bed Width (ft) · Spacing Between Plants (inches) · Rows per Bed |
| Grass Seed Calculator | Calculate grass seed needed for lawn overseeding or new lawn | Lawn Area (sq ft) · Seed Type · Application |
| Fertilizer Application Calculator | Calculate fertilizer amount for your lawn or garden | Area (sq ft) · N-P-K Ratio · N Needed (lb/1000 sqft) |
| Compost Bin Size Calculator | Find the right compost bin size for your household | People in Household · Yard Waste (gallons/week) · Kitchen Waste (gallons/week) |
| Rain Barrel / Rainwater Harvesting Calculator | Calculate rainwater collection from your roof | Roof Area (sq ft) · Monthly Rainfall (inches) · Barrel Size (gallons) |
| Garden Irrigation Flow Rate Calculator | Calculate drip irrigation or sprinkler flow rate needed | Garden Area (sq ft) · Number of Plants · Water per Plant (gal/hr) · Minutes per Day |
| Pool Water Volume Calculator | Calculate pool water volume in gallons | Length (ft) · Width (ft) · Deep End Depth (ft) · Shallow End Depth (ft) |
| Pool Chemical Balance Calculator | Calculate pool chemical dosages to balance water | Pool Volume (gallons) · Current Chlorine (ppm) · Target Chlorine (ppm) · Current pH |
| Furniture Room Layout Calculator | Plan furniture arrangement and spacing in a room | Room Width (ft) · Room Length (ft) · Sofa Length (ft) · Sofa Depth (ft) · Coffee Table Length (ft) |
| TV Mount Height Calculator | Find the ideal TV mounting height for your room | TV Size (inches, diagonal) · Seat Eye Height (inches) · Viewing Distance (ft) · TV Tilt? |
| Staircase Dimensions Calculator | Calculate staircase rise, run, and stringer length | Total Rise (inches) · Max Riser Height (inches) · Tread Depth (inches) |
| Countertop Square Footage Calculator | Calculate countertop area for kitchen or bathroom | Section 1 Length (inches) · Section 1 Depth (inches) · Section 2 Length (inches) · Section 2 Depth (inches) · Backsplash Height (inches) |
| Closet Organizer Size Calculator | Plan closet shelving, hanging space, and storage | Closet Width (inches) · Closet Depth (inches) · Closet Height (inches) · Hanging Space % |
| Cabinet & Drawer Size Calculator | Calculate cabinet door and drawer dimensions | Cabinet Width (inches) · Cabinet Height (inches) · Number of Doors · Overlay (inches) |
| Tile Grout & Mortar Calculator | Calculate grout and thin-set mortar needed for tiling | Tile Area (sq ft) · Tile Size · Grout Line Width (inches) · Tile Thickness (inches) · Trowel Notch (mortar bed) |
| LED Bulb Savings Calculator | Calculate savings from switching to LED bulbs | Current Bulb Wattage · LED Wattage · Number of Bulbs · Hours On per Day · Electricity Rate ($/kWh) |
| Home Square Footage Calculator | Calculate total square footage of a house or apartment | Room Length (ft) · Room Width (ft) · Stories · Garage (sq ft) · Unfinished Basement (sq ft) |
| Kitchen Remodel Budget Calculator | Plan your kitchen remodel budget across all categories | Kitchen Size · Quality Level |
| Roof Area Calculator | Estimate roof square footage and shingle quantity | Home Footprint (sq ft) · Roof Pitch · Complexity |
| Vinyl / Laminate Flooring Calculator | Calculate vinyl plank or laminate flooring needed | Room Area (sq ft) · Per Box Coverage (sq ft) · Waste % · Underlayment Needed? |
| Solar Panel System Size Calculator | Calculate solar panel system size and savings | Monthly Electricity Usage (kWh) · Peak Sun Hours per Day · Panel Wattage (W) · Available Roof Area (sq ft) |
| Solar Battery / Home Battery Calculator | Calculate home battery needs for solar energy storage | Daily Energy Use (kWh) · Backup Coverage % · Battery Capacity (kWh) · Depth of Discharge % |
| Home EV Charger Installation Cost | Calculate the cost to install an EV charger at home | Distance from Panel (ft) · Charger Type · Panel Upgrade Needed? |
| Raised Bed Soil Calculator | Soil volume for a raised garden bed | Length (ft) · Width (ft) · Depth (in) |
| Garden Fence Calculator | Fencing for a garden perimeter | Length (ft) · Width (ft) · Height (ft) · Post Spacing (ft) |
| Lawn Watering Calculator | Water needed for your lawn | Lawn Length (ft) · Lawn Width (ft) · Water (in/week) |
| Sprinkler Head Count | How many sprinkler heads you need | Zone Length (ft) · Zone Width (ft) · Sprinkler Radius (ft) |
| Compost Bin Calculator | Compost bin size for your yard waste | People in Household · Yard Waste (gal/week) |
| Firepit Size Calculator | Firepit ring size and stone count | Firepit Diameter (in) · Stone Length (in) · Wall Height (in) |
| Deck Post Spacing | Deck joist and post layout | Deck Length (ft) · Joist Spacing (in) · Max Beam Span (ft) |
| Porch Light Size | Recommended porch light size | Mounting Height (ft) · Door Width (ft) · Fixture |
| Ceiling Fan Size Calculator | Right ceiling fan size for a room | Room Length (ft) · Room Width (ft) · Ceiling Height (ft) |
| Humidifier Size Calculator | Humidifier capacity for a room | Room Size (sq ft) · Current RH % · Target RH % |
| Tree Spacing Calculator | How many trees fit in an area | Area Length (ft) · Area Width (ft) · Spacing (ft) |
| Tile Grout Calculator | Grout needed for a tiled area | Tile Area (sq ft) · Tile Length (in) · Tile Width (in) · Joint Width (in) · Joint Depth (in) |
| Appliance Running Cost Calculator | Electricity cost of a single appliance | Appliance Wattage (W) · Hours per Day · Days per Month · Electricity Rate ($/kWh) |
| Firewood Calculator | Cords in a stack and what they cost | Stack Length (ft) · Stack Height (ft) · Log Depth (ft) · Price per Cord ($) |
| Solar Panel Payback Calculator | Estimate solar panel payback period, net cost after incentives and lifetime savings from production and rate. | System cost · Annual production (kWh) · Annual usage (kWh) · Electricity rate per kWh · Incentive or tax credit (percent) |
| Household Carbon Footprint and Offset Calculator | Estimate a household annual carbon footprint from flights, driving and home electricity, plus the offset cost. | Return flights a year · Average hours per flight · Car miles a year · Home electricity a year (kWh) · Offset price per tonne |
| First-Year Homeowner Cost Calculator | Total the cash you need in the first year of owning a home, from closing and moving to taxes and maintenance. | Home price · Closing costs · Moving cost · Furnishing and setup · Emergency repairs |
Prefer the annotated list? Browse the full list with one line on what each calculator does.
Last updated