Free calculators & tools

Measure a roof, pick a pitch and order the right number of shingle bundles, underlayment rolls and gutters.

• Gable roof calculatorRoof area, rafter length and materials for a two-sided gable roof.
• Hip roof calculatorArea and ridge/hip lengths for four-sided hip roofs.
• Roof area calculatorTurn a footprint and pitch into true roof square footage and squares.
• Roof pitch calculatorRise over run, degrees and the pitch multiplier.
• Shingle calculatorSquares and bundles of shingles, with waste.
• Shingle bundle calculatorHow many bundles to order for a given roof area.
• Underlayment calculatorRolls of felt or synthetic underlayment.
• Metal roof calculatorPanels, trim and screws for a metal roof.
• Rafter length calculatorRafter length from span, pitch and overhang.
• Roof truss calculatorTruss count and spacing for a building length.
• Gutter calculatorGutter runs, downspouts and hangers.
• Asphalt shingle roof cost calculatorInstalled cost range for a shingle roof.
• Metal roofing cost calculatorMaterial and labor cost for metal roofing.
• Minimum roof pitch calculatorLowest allowed slope for shingles, metal and other roof coverings (IRC R905).
• Hip rafter calculatorHip and jack rafter lengths and side cuts.
• Valley rafter calculatorValley rafter length for equal or unequal pitches.
• EPDM rubber roof calculatorMembrane sheets, adhesive and seam tape for a flat roof.
• Rolled roofing calculatorRolls of roll roofing for sheds and low-slope roofs.
• Collar tie calculatorCollar tie length, height and spacing (IRC R802.4.6).

Size the framing, count the boards and price a deck before you buy lumber.

• Deck cost calculatorMaterial and labor cost for wood or composite decks.
• Deck board calculatorBoards and linear feet for any deck size.
• Deck joist calculatorJoist count and size for your span and spacing.
• Deck footing calculatorFooting count, size and concrete.
• Deck block calculatorPier blocks for a floating deck.
• Stair stringer calculatorRise, run and stringer length for deck stairs.
• Deck railing calculatorPosts, rails and balusters for the railing.
• Deck stain calculatorGallons of stain or sealer for your deck.
• Composite vs wood deck calculatorCompare upfront and lifetime cost.
• Deck joist span chartAllowable joist spans by lumber size and spacing.
• Deck ramp calculatorRamp length at 1:12, landings and materials (IRC or ADA).
• Stair handrail calculatorHandrail length along the stair nosing line.

Posts, pickets, panels and concrete for wood, vinyl and chain link fences.

• Fence linear footage calculatorMeasure the run of a fence line.
• Fence post calculatorPosts needed for a fence length and spacing.
• Fence picket calculatorPickets for any fence length and gap.
• Fence post concrete calculatorBags of concrete per post and in total.
• Wood fence calculatorPosts, rails, pickets and cost for a wood fence.
• Vinyl fence calculatorPanels and posts for vinyl fencing.
• Chain link fence calculatorFabric, posts, rails and fittings.
• Fence gate calculatorGate width, hardware and framing.
• Fence cost per foot calculatorInstalled cost per linear foot by material.
• Picket spacing calculatorEqual gaps between pickets, with pool-code presets.
• T-post calculatorLine posts, post length and clips for wire fencing.
• Fence board calculatorBoards for a privacy fence using real dressed widths.
• Fence paint and stain calculatorGallons to paint or stain a fence, one or both sides.

Tile, grout and thinset for floors, showers and backsplashes, with waste built in.

• Tile calculatorTiles and boxes for any floor or wall, with waste.
• Bathroom tile calculatorFloor and wall tile for a bathroom.
• Shower tile calculatorTile for shower walls, floor and niche.
• Backsplash calculatorTile for a kitchen backsplash.
• Grout calculatorPounds of grout for tile size and joint width.
• Thinset calculatorBags of thinset mortar by trowel size.
• Herringbone tile calculatorTile and waste for herringbone layouts.
• Tile cost calculatorMaterial and installation cost for a tile job.
• Shower niche size calculatorNiche size that fits whole tiles and the stud bay.
• Deck mud calculatorDry-pack mortar for a sloped shower pan.
• Tile edge trim calculatorTrim sticks and profile height for tile edges.

Reach a target R-value, count bags and batts, and plan drywall.

• Attic insulation calculatorBags or rolls to reach a target R-value.
• R-value calculatorTotal R-value of a wall or ceiling assembly.
• Blown-in insulation calculatorBags of blown cellulose or fiberglass.
• Spray foam calculatorBoard feet and kits of spray foam.
• Wall insulation calculatorBatts for stud walls by cavity size.
• Insulation cost calculatorCost by material, area and R-value.
• Soundproofing calculatorMaterials to quiet a wall or room.
• Drywall calculator app (Android)Sheets, mud, tape and screws for walls and ceilings.
• Insulation thickness calculatorInches of insulation needed to hit a target R-value.
• Wall assembly R-value calculatorWhole-wall R-value with studs, sheathing and air films.
• Reverberation time calculatorHow long a room echoes, and what absorption cuts it (Sabine).
• R-value insulation chartCode-minimum R-values by climate zone, plus R per inch and depth.
• How much drywall will I need?Sheets, mud, tape, screws and installed cost for a room.

Cubic yards and tons of gravel, stone, soil and mulch, plus concrete and pavers.

• Gravel calculatorCubic yards and tons of gravel for any area.
• Gravel tons calculatorConvert yards of gravel to tons.
• #57 stone calculatorTons of #57 crushed stone for drainage and bases.
• Pea gravel calculatorPea gravel for paths, patios and play areas.
• Gravel driveway calculatorBase and top layers for a gravel driveway.
• Crushed stone calculatorTons of crushed stone by depth.
• Mulch calculatorCubic yards or bags of mulch for beds.
• Topsoil calculatorTopsoil for lawns and garden beds.
• Concrete calculatorYards or bags of concrete for slabs and footings.
• Paver calculatorPavers, base and sand for a patio.
• Sod calculator app (Android)Sod rolls and pallets for a new lawn.
• Sod calculatorSlabs, rolls and pallets of sod for a lawn.
• Raised bed soil calculatorCubic feet, yards and bags for raised beds, with an equal-thirds mix.
• Flagstone calculatorTons of flagstone by thickness, plus base and sand.
• Playground surfacing calculatorPea gravel, wood chips, mulch or sand at CPSC fill depth, use zone included.
• Dry well calculatorRoof runoff, pit size and #57 stone for a gravel dry well.
• How many yards in a ton of gravelTons to cubic yards, dump-truck loads and driveway examples.
• How much sod is in a palletPallet coverage, rolls and slabs for any lawn size.

Ingredient-specific grams-to-cups conversions — a cup of flour and a cup of sugar don't weigh the same.

• Flour grams to cupsAll-purpose flour by weight and volume.
• How many grams in a cup of flourThe number most recipes need.
• Sugar grams to cupsGranulated sugar conversions.
• Brown sugar grams to cupsPacked brown sugar conversions.
• Butter grams to cupsButter in grams, cups, sticks and tablespoons.
• Almond flour grams to cupsAlmond flour weighs less than wheat flour.
• Cups to grams converterAny ingredient from cups to grams.
• Grams to tablespoonsSmall quantities for spices and leaveners.
• Recipe converterScale a recipe up or down.
• Oven temperature converterFahrenheit, Celsius and gas mark.
• Baking pan converterSwap pan sizes and adjust the batter.
• Sourdough calculatorBaker's percentages and true hydration, starter included.
• Coffee ratio calculatorGrams of coffee to water for any brew size.

Payments, affordability, refinancing and PMI, with the math shown.

• Mortgage calculatorMonthly payment with taxes, insurance, HOA and PMI.
• How much house can I affordPrice range from income, debts and down payment.
• Amortization scheduleEvery payment split into principal and interest.
• Rent vs buy calculatorCompare the total cost of renting and buying.
• Refinance break-even calculatorMonths until a refinance pays for itself.
• PMI removal calculatorWhen private mortgage insurance can come off.
• Early mortgage payoff calculatorInterest saved by paying extra.
• Salary needed for a houseIncome it takes to afford a price, using the 28/36 rule.
• Mortgage recast calculatorNew payment after a lump sum, recast vs prepaying.

Plan a budget, split bills and pay down debt faster.

• Credit card payoff calculatorMonths and interest to clear a balance.
• Debt snowball calculatorOrder and timeline for paying off debts.
• 50/30/20 budget calculatorSplit take-home pay into needs, wants and savings.
• Monthly budget calculatorIncome minus bills, at a glance.
• Prorated rent calculatorRent for a partial month.
• Salary needed to afford rentTypical rent in the 100 largest US metros and the pay the 30% rule asks for.
• Split bill calculatorShare bills fairly between roommates.
• Electricity cost calculatorWhat an appliance costs to run.
• Emergency fund calculatorHow much to keep set aside.
• How much to keep in checkingA checking balance that covers bills and a buffer.
• Overdraft fee calculatorWhat overdrafts cost over a month or a year.
• Yearly expenses calculatorAdd up weekly, monthly and annual costs into one yearly total.

Savings growth, retirement targets and what side work really pays.

• Compound interest calculatorGrowth of savings with regular deposits.
• FIRE number calculatorSavings needed to retire early.
• Hourly to salary calculatorHourly wage to yearly, monthly and weekly pay.
• Self-employment tax calculatorEstimated SE tax on freelance income.
• Freelance rate calculatorHourly rate needed to hit an income goal.
• Gig driver pay calculatorReal hourly pay after gas and wear.
• Etsy profit calculatorProfit per sale after Etsy fees.
• How long will my money lastYears your savings last at a given withdrawal.
• High-yield savings calculatorInterest earned at an APY, with monthly deposits.
• Coast FIRE calculatorWhen you can stop saving and let growth finish the job.
• Barista FIRE calculatorSavings needed when part-time work covers some costs.
• Coast FIRE calculator and table by ageRun your coast FIRE number in the page, with a table by age.

Pricing, tax and paperwork tools for small businesses and freelancers.

• Profit margin calculatorMargin from cost and price.
• Markup vs margin calculatorConvert between markup and margin.
• Sales tax calculatorAdd or back out sales tax.
• Break-even calculatorUnits needed to cover fixed costs.
• Card processing fee calculatorWhat card fees cost per sale.
• Free invoice generatorMake and print an invoice in the browser.
• Estimate generatorContractor-style estimates with line items.
• Timesheet calculatorHours and pay from clock-in times.
• Quote vs invoice vs estimateWhat each document is, when to send it and what it must show.
• Mileage deduction 2025 and 2026IRS rates, a worked example and what the log must show.

Everyday unit conversions and live currency tools for travel.

• Length converterInches, feet, meters, miles and more.
• Kilograms to poundskg to lbs with a reference table.
• Fahrenheit to CelsiusTemperature conversion with the formula.
• Centimeters to inchescm to in for everyday measurements.
• USD to EUR converterDollar to euro at the latest rate.
• Travel budget calculatorTrip costs in your home currency.
• Exchange rate markup calculatorWhat a bank or airport rate really costs.
• Shoe size converterUS men's and women's, UK, EU and cm sizes, or size from foot length.
• Torque converterN·m, ft-lb and in-lb, plus horsepower at rpm.
• VAT refund calculatorTourist VAT refund in 22 countries, after handling fees.
• Dynamic currency conversion calculatorWhat paying in your home currency abroad really costs.

Convert, compress and resize images in the browser — files aren't uploaded.

• WebP to JPG converterConvert WebP images to JPG in the browser.
• HEIC to JPG converteriPhone photos to JPG without uploading.
• PNG to JPG converterSmaller files for sharing and uploads.
• Compress image to 100 KBHit a form's file-size limit.
• Image resizerResize to exact pixel dimensions.
• Resize image for InstagramSquare, portrait and story sizes.
• Favicon generatorIcons for a website from one image.
• Make background transparentRemove a solid background in the browser, no upload.
• Add border to imageBorders, mats, rounded corners and square padding.
• How to convert WebP to JPGChange WebP to JPG in the browser, Paint or Preview.

Free browser logic puzzles and geography quizzes. No download or sign-up.

• NonogramPicture logic puzzles from 5×5 to 15×15, each solvable without guessing.
• Binary puzzleFill the grid with 0s and 1s; every puzzle has one solution.
• 50 states matching gamePair each US state with its capital, postal code or nickname, against the clock.
• US state nicknames quizSunshine State, Lone Star State and the other 48, with where each comes from.
• Continents and oceans quizThe 7 continents and 5 oceans by size, depth and which touches which.