Everything on the site
All 139 calculators, tools and guides on one page.
Calculators
Concrete & Masonry
5Concrete Slab Calculator — Bags and Cubic Yards for a Slab, Footing or PierCubic yards and bag count for a slab, footing or padBrick and Block Calculator — How Many Bricks or CMU per Square Foot of WallUnit count, mortar and sand for a brick or CMU wallMortar Mix Calculator — Bags of Type N, S or M for Laying and RepointingMortar volume for laying or repointing, as bags or as portland, lime and sandRetaining Wall Block Calculator — Courses, Caps, Base Gravel and Drain StoneBlock count, courses, caps and gravel for a segmental retaining wallPaver Patio Calculator — Pavers, Base Gravel and Joint Sand by PatternPaver count, base gravel, bedding sand and joint sand for a patio or walkway
Paint, Tile & Flooring
12Curtain Size Calculator — Panel Width, Length and Fabric Yardage With FullnessFinished panel width and length, panel count and yardageDrywall Sheet Calculator — Sheets, Screws, Tape and Joint Compound for a RoomSheets, screws, tape and mud for walls and ceilingInsulation Calculator — Batts or Blown Bags for a Target R-ValueBatt count or bags of blown, and the depth an R-value needsLighting Layout Calculator — Recessed Light Spacing, Count and Lumens per RoomLumens for the room, fixture count and the spacing gridRoofing Squares Calculator — Shingle Bundles, Starter, Ridge Cap and NailsSquares, bundles, starter, ridge cap and nails for a shingle roofRoof Pitch Calculator — X-in-12 to Degrees, Percent and the Slope MultiplierConvert pitch to degrees, percent and the area multiplierGutter and Downspout Sizing Calculator — 5 in or 6 in K-Style and How Many LeadersGutter size, downspout count and spacing from roof area and rainfallRoof Underlayment and Drip Edge Calculator — Rolls, Sticks and Ice BarrierUnderlayment rolls, drip edge sticks and ice barrier coveragePaint Calculator — Gallons per Coat for a Room, With Door and Window DeductionsGallons per coat and the can sizes to actually buyTile Calculator — Tiles, Boxes, Thinset and Grout With Diagonal WasteTiles, boxes, thinset and grout for a floor or wallFlooring Calculator — Boxes of LVP, Laminate or Hardwood Plus UnderlaymentBoxes of LVP, laminate or hardwood, plus the last-row widthWallpaper Calculator — Rolls Needed With Pattern Repeat and Half DropRolls, strips per roll, and what the pattern repeat costs you
Plumbing & Water
4Pipe Volume Calculator — Gallons of Water in a Run of Copper, PEX or PVCGallons, weight and flush time for a length of pipeWater Flow Pressure Drop Calculator — Friction Loss and Velocity in a Pipe RunFriction loss in psi and velocity in ft/s over a runPool Volume Calculator — Gallons in a Rectangular, Round or Oval Pool or TankGallons and turnover time for a pool, pond or tankDrain Slope Calculator — Fall Per Foot for a Waste Line or French DrainTotal fall and invert elevations for a sloped drain run
Metal & Welding
4Metal Weight Calculator — Steel, Stainless, Aluminum and Brass Bar, Tube, Plate and AngleWeight of plate, bar, tube and angle in steel, stainless, aluminum, brass or copperBend Allowance Calculator — Flat Pattern, Bend Deduction and K-Factor for Sheet MetalFlat blank length from thickness, bend radius, angle and K-factorTap Drill Size Calculator — Tap and Clearance Drills for UNC, UNF and Metric ThreadsTap drill and clearance drill for any common thread, at the engagement you chooseWeld Cost Calculator — Deposited Metal, Filler, Gas and Labor per JointDeposited weld metal, filler consumed, gas used and cost per joint
Vehicle & Garage
4Tire Size Comparison Calculator — Diameter, Circumference and Speedometer ErrorCompare two tire sizes and the speedometer error between themGear Ratio Speed Calculator — MPH from RPM, Axle Ratio and Tire DiameterRoad speed and cruising rpm from gearing and tire sizeTowing and Payload Calculator — What Is Left After Passengers, Cargo and Tongue WeightPayload left over once passengers, cargo and tongue weight are countedOil Change Cost Calculator — Cost per Change, per Year and per MileCost per oil change, per year and per mile, comparing two options
Solar & Off-Grid
4Solar Panel Array Sizing Calculator — Array kW, Panel Count and Roof Area for a Daily LoadArray kW and panel count for a daily kWh loadBattery Bank Sizing Calculator — Amp-Hours, Usable kWh and Series/Parallel LayoutAmp-hours and battery count for a backup or off-grid bankInverter and Charge Controller Sizing Calculator — Continuous Watts, Surge and MPPT vs PWM AmpsInverter continuous and surge watts, plus controller ampsSolar Payback Calculator — Years to Break Even and 25-Year Savings on a Solar SystemBreak-even years and lifetime savings on a solar system
Lumber & Framing
8Wood Movement Calculator — Seasonal Width Change and the Gap a Joint NeedsSeasonal width change by species and grain, and the slot or gap to allow for itWood Finish Coverage Calculator — How Much Stain, Oil, Poly or Shellac to BuyQuantity of stain, oil, polyurethane or shellac for an area and a number of coatsGlue and Clamp Calculator — Glue Quantity, Clamp Count, Spacing and PressureGlue quantity for a glue-up, plus how many clamps, how far apart and how hardShelf Sag Calculator — Deflection by Span, Thickness, Material and LoadPredicted deflection of a shelf, and whether it clears an acceptable-sag limitBoard Foot Calculator — Nominal vs Actual, Quarter Sizes and Lumber CostBoard feet and cost for dimensional lumber and rough hardwoodStud Wall Framing Calculator — Studs at 16 or 24 On Center, Plates and HeadersStuds, plates, headers and board feet for a framed wallDeck Board Calculator — Boards, Linear Feet, Joists and FastenersDeck boards, lineal feet, fasteners and joist count for a deck surfacePlywood Sheet Calculator — How Many 4x8 Sheets and How Much OffcutSheets of plywood, OSB or MDF for a given area, with offcut left over
Yard & Garden
8Sod and Grass Seed Calculator — Rolls, Pallets and Pounds of Seed by Lawn SizeSod rolls, pallets and pounds of seed for a lawn areaFertilizer Calculator — Pounds of Product From an N-P-K Analysis and a Nitrogen TargetPounds of product from the bag analysis and a lb-N targetFirewood Cord Calculator — Cords, Face Cords, Price per Cord and Heat ValueCords and face cords from stack size, with price and heat valueIrrigation Zone Calculator — Heads per Zone, Zone Count and Sprinkler Run TimeHeads per zone, zone count and run time from GPM and head spacingMulch Calculator — Cubic Yards and 2 Cu Ft Bags by Bed Size and DepthCubic yards, bag count and bulk order for bedsTopsoil Calculator — Cubic Yards, Bags and Tons With a Settling AllowanceCubic yards, bags and approximate tons of soil or garden mixGravel Driveway Calculator — Yards and Tons per Layer With CompactionCubic yards and tons of gravel by layer, with compactionFence Post Calculator — Post Count, Spacing and Concrete per HolePost count, rails or panels, and concrete per hole
Shop Math
18CFM Calculator from Air Changes per Hour — Fan Sizing for a Bathroom, Kitchen or ShopRequired CFM from room volume and a target ACH, and the reverseDuct Size Calculator — Round and Rectangular Duct from CFM, Velocity or Friction RateRound diameter and equivalent rectangular sizes from CFMDust Collection Calculator — CFM Per Machine, Duct Velocity and Whether Your Collector Is EnoughRequired CFM, transport velocity check and system resistanceDehumidifier Size Calculator — Pints Per Day for a Basement, Crawlspace or ShopPints per day from area, dampness level and conditionsMoving Truck Size Calculator — Cubic Feet, Truck Length and How Many TripsCubic feet of household goods, truck length, and trips for a smaller truckStorage Unit Size Calculator — Square Footage, Unit Size and Monthly CostSquare footage and unit size from a volume, with stacking and an aisleMoving Box Calculator — How Many Small, Medium and Large Boxes, With Tape and PaperBox counts by size, plus tape, paper, bubble wrap and costFurniture Fit Calculator — Will It Fit Through the Door, Hallway and Stair TurnDoorway, tilt angle, corner turn and the diagonals that governCut List Optimizer — How Many Boards or Bars, With Kerf and OffcutFit a list of parts onto stock lengths with the kerf accounted forMiter Angle Calculator — Compound Miter and Bevel for Any Number of SidesMiter and bevel settings for corners, polygons and compound sloped workAppliance Running Cost Calculator — What a Device Costs per Day, Month and YearCost per day, month and year from watts and hoursLED Conversion Savings Calculator — Annual Savings, Payback and Lifetime CostAnnual savings, payback and lifetime cost of switching to LEDAir Conditioner BTU Calculator — Room AC Sizing With the Oversizing CaveatA starting BTU range for a room air conditionerWater Heater Running Cost Calculator — Annual Energy and Cost, Tank vs TanklessAnnual energy and cost, and tank against tanklessRafter Length Calculator — Common Rafter, Roof Pitch and Plumb Cut AnglesRafter length, roof angle and plumb and seat cut settings from pitch and runStair Stringer Calculator — Risers, Treads, Total Run and Stringer LengthRiser count, actual riser height, total run and stringer length from a total riseSlope and Grade Calculator — Percent, Ratio, Degrees and Rise Over a RunConvert between percent grade, a 1-in-X ratio, degrees and rise over a runFraction to Decimal Converter — Shop Fraction Math for InchesAdd and subtract inch fractions, and round decimals to 64ths, 32nds, 16ths or 8ths
Electrical
4Voltage Drop Calculator — Percent Drop Over a Run in Copper or AluminumVolts and percent lost over a run, for copper or aluminiumWire Size Calculator — AWG for a Given Load, Distance and Voltage Drop TargetConductor size a run needs to hold a target voltage dropCircuit Load Calculator — Amps on a Branch Circuit and the 80 Percent RuleAdd up the loads on a branch circuit against the breaker ratingGenerator Sizing Calculator — Running Watts vs Starting Surge by ApplianceRunning watts and starting surge for a list of appliances
3D Printing
2Filament Cost Calculator — Cost per 3D Print Including Power and FailuresWhat a 3D print actually costs — filament, power, wear and failuresResin Print Cost Calculator — Cost per Part Including IPA, FEP and FailuresCost per part for MSLA resin printing, including IPA, FEP and failures
Tools
Files & Code
30JSON Formatter and Validator — Pretty Print, Minify, Find the Syntax ErrorIndent, minify and validate JSON, with the error lineJSON Diff — Compare Two JSON Documents by Path, Not by LineAdded, removed and changed keys between two JSON documentsYAML to JSON Converter — Both Directions, with Indentation Errors LocatedConvert YAML to JSON and back, in the browserCSV to JSON Converter — RFC 4180 Quoting, Tabs and Semicolons, Both DirectionsCSV or a pasted spreadsheet to JSON, and backJSON to TypeScript — Generate Interfaces from a Sample ResponseInterfaces or type aliases inferred from a JSON sampleAPI Response Viewer — Explore JSON by Path, Type and NullEvery value in a JSON response, with its path and typeQR Code Generator — URL or Text to a Downloadable PNGEncode a link or text as a PNG QR code, offlineHash Generator — SHA-256, SHA-512, SHA-1, MD5 and CRC32 for Text or a FileSix digests of a string or a local file, computed in the pageUUID Generator — Random v4 Identifiers in Bulk, With Format OptionsBatch of random v4 UUIDs from the browser CSPRNGJWT Decoder — Read the Header and Claims of a JSON Web TokenBase64url-decode a token and read its claims and expirySQL Formatter — Break a One-Line Query into Readable ClausesIndent, wrap and case a query, or squash it back to one lineCSS Minifier and Beautifier — Strip a Stylesheet Down or Open It Back UpMinify or re-indent CSS, with the before and after byte countBase64 Encoder and Decoder — UTF-8 Safe, With the URL-Safe AlphabetEncode and decode Base64 without mangling UTF-8URL Encoder and Decoder — Percent Encoding for Query Values and Whole URLsPercent-encode a single value or a whole URLURL Parser — Split an Address Into Its Parts and Edit the QueryBreak a URL into parts and rebuild itQuery String Builder and Parser — Take Parameters Apart or Put Them TogetherParse a query string to a table, or build one from a listUTM Builder — Campaign Tracking Links That Do Not Split Your ReportsAdd utm_source, medium and campaign to a linkHTML Escape and Unescape — Entities, and JavaScript String EscapingConvert to and from HTML entities, or escape for a JS stringChmod Calculator — Octal 755, Symbolic rwxr-xr-x and the Special BitsOctal and symbolic permissions, converted both waysRead ls -l Output — Decode rwx Strings, Octal Modes and Risky PermissionsPaste ls -l output, get it read back in plain termsCron Expression Parser — Plain English Reading and the Next Five RunsRead a crontab line and see when it actually firesIPv4 Subnet Calculator — CIDR, Mask, Broadcast and Usable Host RangeCIDR to network, broadcast, host range and maskNumber Base Converter — Binary, Octal, Decimal, Hex and Two’s ComplementAny base 2-36, with two’s complement bit patternsUnix Timestamp Converter — Epoch Seconds and Milliseconds to Local Time and UTCEpoch seconds or milliseconds to a readable date, both waysRegex Tester — Match, Capture Groups and Replace Preview (JavaScript Engine)Test a pattern, see every match, group and replacementLuhn Checksum Validator — Card Number Format Check for Test DataLuhn check digit and issuer-range check for test numbersISBN Validator and Converter — ISBN-10 to ISBN-13 Check Digit CheckCheck an ISBN check digit and convert between 10 and 13 digitsEmail Format Checker — Syntax Validation and Domain Typo DetectionCheck address syntax and catch common domain typosURL Validator and Inspector — Parse a Link and Spot Phishing PatternsBreak a URL into its parts and flag suspicious shapesPassword Strength Estimator — Entropy, Patterns and Crack TimeEntropy estimate, pattern penalties and crack-time figures
Image Tools
8Image to Base64 — Data URL, img Tag and CSS Snippet, Nothing UploadedTurn a file into a data: URL with the HTML and CSS to paste itBase64 to Image — Decode a Data URL, Preview It and Save the FilePaste the string, see the picture, download it with the right extensionCrop Image to Ratio — 1:1, 4:5, 16:9, 9:16 and Custom, in the BrowserCut to a fixed aspect ratio, choosing which edge is keptRotate and Flip an Image — 90, 180, 270 Degrees and Mirroring, No UploadQuarter turns and mirroring, baked into the pixelsImage Info and EXIF Viewer — Dimensions, Format and Whether GPS Is AttachedReal format, pixel size, colour depth and what the metadata revealsFavicon Generator — PNG Set, Link Tags and Web Manifest from One ImageSix PNG sizes plus the head tags and manifest, built in the browserImage Resizer — Change Pixel Dimensions in the Browser, Nothing UploadedSet width or height, keep the proportions, download the resultImage Compressor — Shrink JPEG and WebP Files Without Uploading ThemRe-encode at a chosen quality, cap the long edge, see the saving
Design & CSS
8CSS Unit Converter — px to rem, em, pt, Percent, vw and vhOne length in every CSS unit, against your own base sizesColor Contrast Checker — WCAG AA and AAA Ratio for Text and UIWCAG contrast ratio, pass and fail by criterion, nearest passing colorCSS Gradient Generator — linear, radial and conic With Live PreviewTwo or three stops to a pasteable linear, radial or conic gradientCSS box-shadow Generator — Offset, Blur, Spread and Layered ShadowsBuild a one or two layer box-shadow and copy the CSSCSS border-radius Generator — Per Corner, Percent and EllipticalPer-corner radii, shorthand and longhand, elliptical slash syntaxCSS Grid Generator — grid-template Columns, Rows and Named AreasColumn and row tracks, named areas, HTML skeleton and a mobile breakpointAspect Ratio Calculator — Reduce Pixel Dimensions and Resize Without DistortionLowest-terms ratio, the missing dimension, and crop mathsPPI Calculator — Pixel Density, Dot Pitch and Retina Viewing DistanceResolution plus diagonal inches gives density, pitch and viewing distance
Color
2Color Converter — HEX to RGB to HSL, with White or Black Text ContrastHEX ↔ RGB ↔ HSL plus the WCAG contrast for text on itColor Palette Generator — Complementary, Analogous and Tint Scales from One Base ColorSix harmony rules plus a 9-step scale, with contrast on every swatch
Text
12Case Converter — camelCase, snake_case, kebab-case, Title Case and BackRe-case text between camel, snake, kebab, constant and prose formsLine Tools — Remove Duplicate Lines, Sort, Trim and Number a ListDedupe, sort, trim and number a list of linesSlug Generator — Turn a Title into a Clean URL SlugTitles to hyphenated, URL-safe slugsText Statistics — Word Count, Sentence Length and Readability ScoresCounts, sentence lengths and readability in one passText Diff — Compare Two Versions Line by LineLine-by-line comparison of two versionsWord Frequency Counter — Which Words You Actually RepeatRanked word counts with a tab-separated exportReading Time Estimator — Word Count to Minutes, With an Editable Reading SpeedHow long a piece takes to read silently or aloudSpeech Time Estimator — Script Word Count to Talk Length, With a Pause AllowanceHow long a script runs when spoken, including pausesKeyword Density Checker — Term Counts, Placement and Distribution in a DraftHow often terms appear in a draft and where they clusterSocial Preview Trimmer — Character Limits and Where Each Platform TruncatesCharacter count against platform limits, with the cut point markedHashtag Generator — Pull Tags From Post Text and Check Them Against Platform LimitsExtract tags from your own text and format them for postingText Similarity Checker — Jaccard, Cosine and Levenshtein Ratio Between Two TextsThree overlap measures between two pieces of text
Converters
6Morse Code Translator — Text to Morse and Back, With Audio at Your WPMText to morse and back, with playback at a chosen WPMBraille Converter — English Grade 1 Uncontracted Braille With Dot NumbersText to uncontracted braille cells and dot numbersText to Binary Converter — Binary, Octal and Hex From UTF-8 BytesText to binary, octal or hex bytes, and back againRoman Numeral Converter — Numbers to Roman Numerals and Back, With ValidationNumbers to roman numerals and back, with a validity checkNumber to Words Converter — Write Any Amount Out in English, Including ChequesNumbers written out in words, cheque format and ordinalsReverse Text Tool — Flip Characters, Words or Lines, and Clean Up SpacingReverse characters, words or lines, and tidy spacing