All Calculators
Home improvement calculators first, from concrete and decks to roofing, walls, floors and yards, plus energy, tax, auto and developer tools. Free, no signup, and everything runs in your browser.
JSON Formatter
Free JSON formatter and beautifier. Pretty-print JSON with 1, 2, or 4-space indents, catch syntax errors, or minify it, all instantly in your browser.
JSON Validator
Validate JSON online for free. Paste your data to find syntax errors with line numbers, plus counts of keys, objects, arrays, and nesting depth.
JSON Minifier
Free JSON minifier that strips whitespace and line breaks, validates your data first, and shows the bytes and percentage saved. Runs in your browser.
JSON Size Calculator
Free JSON size calculator. Paste a payload to see its size in bytes, KB and MB, the minified and real gzipped size, and which keys take up the most room.
JSON to CSV Converter
Convert JSON to CSV online for free. Turn JSON arrays into spreadsheet-ready CSV with comma, semicolon, tab, or pipe delimiters and optional headers.
CSV to JSON Converter
Free CSV to JSON converter. Paste CSV with comma, semicolon, tab, or pipe delimiters and get a clean JSON array using your header row as keys. No signup.
Word Counter
Free word counter that tracks words, characters with and without spaces, sentences, paragraphs, reading time, and top words as you type, privately.
Text Case Converter
Free text case converter: switch text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, or kebab-case in one click.
Lorem Ipsum Generator
Generate lorem ipsum placeholder text by paragraphs, sentences, or words. Choose the amount, start with the classic opening, and copy it for mockups.
Text Diff Checker
Compare two texts online and see every change highlighted line by line: green for additions, red for deletions. Ignore case or whitespace. Free.
Base64 Encoder/Decoder
Free Base64 encoder and decoder. Convert text to Base64 or decode Base64 strings back to readable text, with full UTF-8 and Unicode support. Instant.
URL Encoder/Decoder
Encode or decode URLs online for free. Percent-encode query parameters or full URLs, or turn %XX sequences back into readable text, right in your browser.
HTML Encoder/Decoder
Free HTML encoder and decoder. Convert <, >, & and quotes to HTML entities to display code safely, or decode entities back into plain characters.
UUID Generator
Free UUID generator for random version 4 UUIDs. Create one or many at once, switch to uppercase or remove dashes, and copy them instantly. No signup.
Hash Generator
Free online hash generator. Create MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text at once, with an uppercase option. Runs in your browser.
Password Generator
Free secure password generator to create strong random passwords with uppercase, lowercase, numbers, and symbols.
Regex Tester
Test regular expressions online with live match highlighting, capture groups, and g/i/m/s flags. Includes ready-made email, URL, phone, and IP patterns.
Color Converter
Free color converter for HEX, RGB, HSL, and CMYK. Enter any color value to get every format instantly, with a color picker and copy-ready codes.
Unix Timestamp Converter
Convert Unix timestamps to readable dates and back. Shows the current epoch time, local and ISO 8601 formats, and relative time. Detects seconds or ms.
HTML Formatter
Free HTML formatter and beautifier. Indent messy markup with spaces or tabs for readable code, or minify HTML to shrink it for production. No signup.
CSS Formatter
Format and beautify CSS online for free. Clean up indentation, sort properties A to Z, or minify stylesheets and compare original versus minified size.
JavaScript Formatter
Free JavaScript formatter to beautify minified or messy JS. Choose 2 or 4-space indents, single quotes, and semicolons, or minify code for production.
SQL Formatter
Free SQL formatter that puts each clause on its own line, indents conditions, and uppercases keywords for readable queries. Minify SQL too. In-browser.
Markdown Preview
Free online Markdown editor with live preview. Type Markdown and instantly see headings, lists, links, code blocks, and quotes rendered side by side.
Concrete Calculator
Free concrete calculator for slabs, footings, columns, and stairs. Get cubic yards and cubic meters plus 40, 60, and 80 lb bag counts with 10% waste.
BTU Calculator
Free BTU calculator to size an air conditioner or heater for any room. Enter dimensions, ceiling height, insulation, and sun exposure to get BTU and tons.
Square Footage Calculator
Free square footage calculator for rooms, yards, and complex shapes. Calculate area in sq ft, sq m, and acres.
Stair Calculator
Free stair calculator that finds riser height, tread depth, number of steps, stringer length, and stair angle from your total rise, with code checks.
Roofing Calculator
Free roofing calculator that turns roof size and pitch into shingle bundles, underlayment rolls, ridge caps, drip edge, and nails, plus a cost estimate.
Tile Calculator
Free tile calculator for floors, walls, and backsplashes. Enter area, tile size, and grout width to get tiles and boxes needed with waste, plus cost.
Mulch Calculator
Free mulch calculator for rectangle, circle, or triangle beds. Enter area and depth to get cubic yards and 2 cu ft bags needed, with an optional cost.
Gravel Calculator
Free gravel calculator for driveways, paths, and landscaping. Get cubic yards and tons of stone for rectangular, circular, or triangular areas, plus cost.
Voltage Drop Calculator
Free voltage drop calculator for copper or aluminum wire. Enter AWG gauge, amps, one-way length, and system voltage to get drop percent and end voltage.
Resistor Calculator
Free resistor color code calculator for 4, 5, and 6-band resistors. Pick the band colors to get resistance, tolerance, and the min and max values.
Ohms Law Calculator
Free Ohm's law calculator. Enter any two known values to solve for voltage, current, resistance, or power, with V = I x R and P = V x I formulas shown.
Electricity Cost Calculator
Free electricity cost calculator. Add appliances by wattage and hours of use per day to estimate daily, monthly, and yearly kWh and cost at your rate.
IP Subnet Calculator
Free IPv4 subnet calculator. Enter an IP and CIDR prefix to get the network and broadcast addresses, subnet and wildcard masks, and usable host range.
Bandwidth Calculator
Free bandwidth calculator to estimate how long a file takes to download or upload at your connection speed in Kbps, Mbps, or Gbps, plus unit conversions.
Fuel Cost Calculator
Free fuel cost calculator for road trips. Enter distance, MPG, and gas price to see total cost, gallons needed, cost per mile, and round-trip totals.
Gas Mileage Calculator
Free gas mileage calculator to find your car's MPG from one fill-up or track many. Get L/100km, km/L, cost per mile, and best and worst MPG figures.
Horsepower Calculator
Free horsepower calculator using HP = torque x RPM / 5252. Solve for horsepower, torque in lb-ft, or engine RPM when you know the other two values.
Quarter Mile Horsepower Calculator
Estimate engine horsepower from vehicle weight and quarter-mile elapsed time or trap speed. Free calculator with a 1/4 mile performance reference.
Tire Size Calculator
Free tire size calculator to compare two tire sizes by width, aspect ratio, and wheel diameter. See diameter change, revs per mile, and speedometer error.
Aquarium Volume Calculator
Free aquarium volume calculator: get fish tank gallons, liters and water weight for rectangle, cube, cylinder, bow-front and hexagon tanks.
Baker's Percentage Calculator
Baker's percentage calculator: turn bread and pizza formulas into gram weights from flour or total dough weight, or weights into percentages and hydration.
Battery Runtime Calculator
Battery runtime calculator: estimate how long a lead-acid, AGM or LiFePO4 battery will run a load, with depth of discharge and inverter losses.
BBQ Meat Calculator
Free BBQ meat calculator: how much brisket, pulled pork, ribs, chicken, burgers or hot dogs to buy per person, with raw weights from cooking yield.
Bike Size Calculator
Bike size calculator: estimate your road, mountain, hybrid or gravel bike frame size from your inseam and height, with a size chart by height.
Board Foot Calculator
Board foot calculator for lumber: enter thickness, width, length and quantity to get board feet, cubic meters and optional cost.
Capital Gains Tax Calculator
Capital gains tax calculator for 2026: estimate federal tax on selling stock, crypto or property, short or long term, including the 3.8% NIIT.
Coffee Ratio Calculator
Coffee ratio calculator for pour-over, drip, French press, AeroPress, cold brew and espresso. Get grams of coffee, water, tablespoons and scoops.
Corporate Tax Calculator
Free 2026 corporate tax calculator: estimate C corporation federal tax at the 21% rate, add a state rate, and see double taxation on dividends.
Deck Calculator
Deck calculator: estimate deck boards, joists and screws from your deck size, board width, gap, board length and joist spacing.
Dehumidifier Size Calculator
Dehumidifier size calculator: find the pints per day you need from room area and dampness using the AHAM sizing chart, with notes on 2019 ratings.
Dog Food Calculator
Free dog food calculator: estimate daily calories and cups of food from your dog's weight, life stage and the food's kcal per cup.
Drywall Calculator
Drywall calculator: find how many 4x8, 4x10 or 4x12 sheets you need for walls and ceilings, plus joint compound, tape and screws.
Federal Income Tax Calculator
Free 2026 federal income tax calculator: AGI, taxable income, Child Tax Credit, capital gains and a bracket-by-bracket breakdown with effective rate.
Fence Calculator
Fence calculator: estimate posts, rails, pickets and bags of concrete for a wood fence from its length, post spacing, height and gates.
Fertilizer Calculator
Free lawn fertilizer calculator: enter your area, N-P-K and target nitrogen to get pounds of fertilizer and bags needed.
Flooring Calculator
Flooring calculator: add up one or more rooms, include 10% or 15% waste, and see how many boxes of laminate, vinyl plank or hardwood to buy.
Generator Size Calculator
Generator size calculator: tick your appliances to total running watts, peak starting surge and a recommended generator size with 20% headroom.
Grass Seed Calculator
Free grass seed calculator: pounds of seed for a new lawn or overseeding, by grass type, using typical seeding rates per 1,000 sq ft.
Insulation Calculator
Insulation calculator for attics and walls: find blown-in depth and bags or batt bags for your target R-value, with DOE attic R-value recommendations.
Paint Calculator
Free paint calculator: estimate how many gallons or quarts of paint you need for walls and ceilings, minus doors and windows, for any number of coats.
Paver Calculator
Paver calculator: count pavers for a rectangular or round patio, plus gravel base and bedding sand in cubic yards and tons.
Paycheck Calculator
Paycheck calculator for 2026: turn a salary or hourly wage into take-home pay after federal tax, Social Security, Medicare, state tax and deductions.
Pool Chlorine Calculator
Free pool chlorine calculator: how much liquid chlorine, cal-hypo, dichlor or trichlor to add to raise free chlorine to your target ppm.
Pool Volume Calculator
Free pool volume calculator: find how many gallons and liters your rectangle, round, oval or kidney pool holds, with constant or sloped depth.
Projector Throw Calculator
Projector throw calculator: find the throw distance for any screen size from your throw ratio, or the image size you get at a given distance.
Quarterly Estimated Tax Calculator
Quarterly estimated tax calculator for 2026: safe-harbor payments for the self-employed, split into four Form 1040-ES installments with due dates.
Retaining Wall Calculator
Retaining wall calculator: estimate wall blocks, courses, cap blocks and gravel base and backfill for a segmental block wall.
S Corp Tax Calculator
S corp vs LLC tax calculator for 2026: compare self-employment tax with S-corp payroll tax on a reasonable salary and see your net savings after costs.
Section 179 Calculator
Free Section 179 calculator for 2026: estimate your equipment and software deduction, the phase-out, the business income limit and your tax savings.
Self-Employment Tax Calculator
Free 2026 self-employment tax calculator: Social Security and Medicare on your net profit, the deductible half, and a rough federal income tax estimate.
Sod Calculator
Free sod calculator: find how many square feet, pieces and pallets of sod you need for your lawn, with an adjustable waste allowance.
Solar Panel Calculator
Solar panel calculator: estimate the system size in kW, number of panels and yearly production from your kWh usage and local peak sun hours.
Topsoil Calculator
Free topsoil calculator: enter area and depth to get cubic yards, cubic feet and bags of topsoil, plus an optional weight estimate.
TV Size Calculator
Free TV size calculator: find the best TV size for your viewing distance, or the ideal distance for a screen size, using SMPTE and THX guidelines.
Wallpaper Calculator
Free wallpaper calculator: work out how many rolls you need from room size, doors, windows, roll size and pattern repeat using the strip method.
Water Heater Size Calculator
Water heater size calculator: find the first-hour rating for a tank heater or the GPM and temperature rise for a tankless unit.
Wire Gauge Calculator
Free wire gauge calculator: find the smallest AWG copper or aluminum wire that meets NEC ampacity and 3% voltage drop for your amps, volts and run length.
Rebar Calculator
Rebar calculator: estimate bars each way, linear feet with laps, sticks to buy, steel weight and chairs for a concrete slab grid.
Roof Pitch Calculator
Roof pitch calculator: find pitch as X/12, angle in degrees, slope percent, pitch multiplier and rafter length from rise and run, angle or span.
Deck Footing Calculator
Deck footing calculator: estimate posts, tributary area and load per footing, minimum footing diameter or square size, and bags of concrete.
Siding Calculator
Siding calculator: add up walls and gables, subtract openings and get square feet, squares, vinyl boxes and panel or plank counts.
Concrete Block Calculator
Concrete block calculator: count 6, 8 or 12 in CMU blocks for a wall, plus mortar bags and grout to fill every core or every other core.
Baseboard & Trim Calculator
Baseboard and trim calculator: linear feet and 8, 12 or 16 ft pieces of baseboard, shoe molding, quarter round or crown, plus finish nails.