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Home improvement & construction calculators

Home Improvement & Construction Calculators for Real Projects

Measure the project, calculate the quantity, then continue into planning, takeoff, purchasing or field work only when the job needs it. Assumptions stay visible and prices stay user-entered.

CalculatePlan a ProjectMeasure a Blueprint

Vendor-neutral planning. Prices stay user-entered. Plan images stay browser-local in Visual Takeoff.

One project evidence path

MEASURE → CALCULATE → PLAN → PRICE → BUY → BUILD → RECORD

Start with only the step you need. Deeper tools remain available without forcing every visitor through the entire platform.

How methods and evidence are handled →Continue from takeoff to estimate →

Three ways to start

Choose the shortest path to the next project decision.

A calculator, project workflow and calibrated takeoff can share the same browser-local project trail later.

Calculate

Calculate a project quantity

Get the measurement, material or package answer first, then open deeper project tools only when you need them.

Find a calculator →Plan a Project

Follow one whole project

Use a guided sequence that connects measurements, calculators, worksheets, estimates, purchasing and closeout without duplicating the arithmetic.

Choose a project →Measure a Blueprint

Measure from a plan or image

Load a PDF or image locally, calibrate a known dimension and trace length or area before handing geometry to a project calculator.

Open Visual Takeoff →

Practice before a real plan

Train calibrated takeoff on six synthetic construction drawings.

Measure area, length and repeated-item counts in Visual Takeoff, then compare your export with transparent answer schedules. No customer plan or account is required.

Open Takeoff Practice LabOpen Visual Takeoff

High-demand project starts

Start with the project family, then choose the shortest tool path.

These clusters connect a quick calculator, a guided project path and plan-based takeoff so you can start with the shortest useful workflow.

Guided project workflows

Follow the job from measurement to shopping and closeout.

Workflows connect the calculators, worksheets and workspace that belong to one real project without duplicating the underlying tools.

View all workflows →
Interior finish workflow

Paint a Room

Measure one room, deduct openings, estimate primer and paint, plan trim touchpoints, then carry the purchase plan into the browser-local workspace.

Open workflow →Floor finish workflow

Install Flooring

Verify floor geometry, plan whole packages or carpet roll length, build an entered-rate budget, compare supplier options, receive materials and carry the project through execution and closeout.

Open workflow →Bathroom finish workflow

Tile a Bathroom

Measure wet-area surfaces, calculate field tile, niche tile, grout and trim, then compare package options and close the project with a punch list.

Open workflow →Outdoor project workflow

Build a Fence

Capture fence runs and gates, coordinate the multi-material fence planner with detailed post, rail, picket and gate-infill takeoffs, then stage the purchase plan.

Open workflow →

Fall project planning · September–November

Weather-sealing, lawn and drainage planning for cooler-season work.

Use these tools as planning starts, then verify local climate, product labels, site conditions and any applicable local requirements before buying or building.

Weather-seal the homeWeather-Seal a Home WorkflowPlan the task →Plan attic coverageAttic Insulation CalculatorPlan the task →Size door/window sealingWeatherstripping CalculatorPlan the task →Plan fall overseedingLawn Seed CalculatorPlan the task →Plan lawn feedingLawn Fertilizer CalculatorPlan the task →Check drainage materialFrench Drain Gravel CalculatorPlan the task →

Priority project tools

Start with high-value measurement and material decisions.

These tools solve common measurement and material decisions and connect directly to deeper project planning when the job needs it.

View all 224 calculators →
Concrete & Masonry

Concrete Form Board Calculator

Estimate concrete form-board run and whole stock pieces from slab dimensions, unformed edges, explicit waste allowance and selected stock length.

Open calculator →Insulation & Sealing

Foam Board Insulation Calculator

Estimate rigid foam-board sheets for a rectangular insulation surface from measured area, openings, actual sheet dimensions and an explicit cut allowance.

Open calculator →Measurement

Square Footage Calculator

Calculate square footage for rectangles, circles or triangles, multiply repeated areas and optionally estimate cost per square foot.

Open calculator →Measurement

Rectangle Diagonal Calculator

Calculate the expected corner-to-corner diagonal of a rectangle and compare it with a field-measured diagonal without treating the result as a structural tolerance.

Open calculator →Walls & Ceilings

Wallpaper Calculator

Estimate wallpaper rolls from room dimensions, wall-by-wall strip rounding, wall height, roll dimensions, pattern repeat and an entered trim allowance.

Open calculator →Roofing & Exterior

Roof Area Calculator

Estimate simple-gable roof square footage and roofing squares from horizontal footprint, overhang and roof pitch before material-specific waste or packaging.

Open calculator →Plumbing & Drainage

Pipe Slope Calculator

Calculate vertical drop from pipe run and an entered slope percentage, with grade ratio reference for layout checks.

Open calculator →Kitchen & Bathroom

Cabinet Linear Feet Calculator

Total base, wall and tall-cabinet runs with an editable planning allowance for preliminary cabinet scope comparisons.

Open calculator →Kitchen & Bathroom

Shower Niche Tile Calculator

Estimate tile coverage for rectangular shower niches from back, side, top and bottom surfaces plus an explicit cut/layout allowance.

Open calculator →Lawn & Garden

Lawn Seed Calculator

Estimate grass seed weight from lawn area and the seed label application rate.

Open calculator →Plumbing & Drainage

Trench Backfill Calculator

Estimate net trench backfill volume after subtracting entered pipe displacement and a defined bedding layer from measured excavation volume.

Open calculator →Interior

Baseboard Calculator

Estimate baseboard or trim linear feet and number of stock pieces for a rectangular room.

Open calculator →

Project discovery

Start with a real project, not a tool name.

These paths connect calculators that commonly belong to the same job while keeping every calculator on its own canonical URL.

Browse every project calculator →

One project, many measurements

Build a material shopping plan as you calculate.

Save results from paint, flooring, trim, landscaping and other tools into one browser-based project. Keep room or area labels, review quantities together, total entered material costs, then print or share a clean summary.

Plan one roomPlan a deckPlan a fenceOpen Project PlannerNo account required. Saved only in this browser.
Example renovation plan
  • Living room paint · 3 gal
  • Flooring · 9 boxes
  • Baseboard · 7 pieces
Combined estimate · when prices are entered

Planning reference

Measure once. Understand the assumption.

Guides explain the inputs behind the calculators so a purchase plan stays auditable.

View all guides →

Paint & Walls

How to Measure a Room for Paint

A practical room-measuring workflow for wall paint: perimeter, wall height, openings, coats and product coverage without double-counting surfaces.

Read guide →

Paint & Walls

Paint Coverage per Gallon: How to Use the Label

Understand paint coverage ratings, why a gallon does not cover every surface equally, and how coverage should feed a room paint estimate.

Read guide →

Paint & Walls

How Many Coats of Paint Should You Plan For?

Learn how coat count changes paint quantity and which project conditions can require more coverage than a one-coat estimate.

Read guide →

Paint & Walls

Paint Waste and Touch-Up Allowance

Plan paint overage without hiding it inside the room measurement, and understand when leftover paint is useful rather than waste.

Read guide →

Paint & Walls

How to Subtract Doors and Windows from Wall Area

Decide when door and window deductions improve a wall-area estimate and how to avoid subtracting surfaces that will still be painted.

Read guide →

Flooring & Tile

How to Measure a Room for Flooring

Measure rectangular and irregular rooms for flooring without hiding closets, alcoves or waste inside a rough square-foot estimate.

Read guide →

Measurement & reference

Convert a measurement or scan a lookup chart.

Use converters when the quantity is known but the unit changes. Use charts when you want common values at a glance.

Open converters →
Converter

Length & Dimension Converter

Convert home-project lengths between feet, inches, yards, meters, centimeters and millimeters on one page without creating separate unit-pair URLs.

Convert units →Converter

Area Converter

Convert area between square feet, square yards, square meters, acres, hectares, square kilometers and square miles for home, lawn and site-planning measurements.

Convert units →Converter

Volume Converter

Convert volume between cubic feet, cubic yards, cubic meters, US gallons and liters for concrete, soil, water and bulk-material planning.

Convert units →
Popular charts:Fractional Inch to Decimal & Millimeter ChartFeet & Inches to Centimeters ChartSquare Feet to Square Meters ChartSquare Yards to Square Feet ChartAll charts →

Maintain after the project

Turn recurring upkeep into a schedule you can actually follow.

Open a seasonal checklist or generate a 12-month reminder plan from your climate profile and home features. The schedule runs locally in your browser.

Build a maintenance scheduleBrowse checklists
Example rhythm
  • Monthly · visible leak and filter checks
  • Spring · drainage and exterior reset
  • Fall · weatherproofing and winter prep
Open whole-home checklist →

Estimate before you commit

Turn project scope into an itemized budget, then compare real quotes.

Use the Project Estimator for materials, labor, rentals, permits, subcontracted work and contingency. Import material quantities from Project Workspace, then move to Purchase Planner when supplier quotes arrive.

Open Project EstimatorCompare supplier quotesPrint estimate worksheet
Estimate evidence ladder
  • Planning allowance
  • Supplier / contractor quote
  • Selected buying plan
  • Actual receipt / invoice
Keep each stage separate instead of overwriting the original plan.

Take the project off-screen

Print a clean worksheet before you measure, shop or inspect.

Use focused browser-local sheets for room measurements, material shopping, punch-list closeout and maintenance records. Your entries stay in this browser unless you print or download them.

Browse printablesOpen measurement worksheet
Project-ready records
  • Scope & assumptions
  • Room measurements
  • Material shopping & supplier quotes
  • Receiving, punch list & maintenance history

Built for decisions

See the math before you buy.

US + Metric

Switch units inside the same calculator. Inputs are converted numerically, not merely relabeled.

Purchase quantities

Results separate measured need, waste allowance and whole-package rounding so overage is visible.

Formula transparency

Each tool explains its formula, assumptions, worked example and product values you should verify.