All Free Online Tools & Calculators

Open a 360 photo in your browser and drag to look around. Zoom and fullscreen. Your file stays on this device…

Open GLB, GLTF, STL, or OBJ in your browser. Orbit, wireframe, lighting, and mesh stats. Free — no install,…

How old am I? Exact age in years, months, and days from date of birth—plus age as of any date, days lived,…

Enter two birthdays to see who is older and the exact age gap in years, months, and days—plus how many days…

Enter your birth date to see your age on Mars, Mercury, Jupiter, and every planet—plus Earth days lived and…

Paste numbers (commas, spaces, or new lines) and get the arithmetic mean instantly—plus sum, count, min, max,…

Convert cups to grams by ingredient for flour, sugar, and butter. Instant baking measurement converter for US…

Estimate your biweekly paycheck from salary or hourly pay. See gross, 2026 federal/FICA take-home, overtime,…

Free adult BMI from height and weight (lb/ft/in or kg/cm). CDC category, healthy weight range, optional…

Estimate body fat % with the US Navy tape method. Height, waist, neck, and hip (women). Fat mass and lean…

Generate bold Unicode text and copy it into Instagram, LinkedIn, Discord, and other plain-text fields. Free…

Create CSS border-radius with a live preview. Adjust every corner, make pills, circles, and blobs, then copy…

Create CSS box shadows with a live preview. Adjust offset, blur, spread, color and opacity, stack layers,…

Find break-even units and sales revenue from fixed costs, price, and variable cost. Includes contribution…

Calculate circuit breaker size from watts or amps, including 120V/240V loads, continuous-load sizing,…

Calculate salt grams for wet, dry, or equilibrium brines from gallons, quarts, liters, or meat weight.…

Calculate cooling or heating BTUs for a room from size, ceiling height, climate, insulation, sun, and…

Convert cake pan sizes and scale batter for round, square, rectangular, loaf, and Bundt pans. Area or volume…

Free online calculator for +, −, ×, and ÷. Phone-style % (200+10%=220), tape saved on this device, keyboard…

Estimate how many calories you need per day. Mifflin-St Jeor BMR, activity TDEE, and lose/gain starting…

Find how much carpet you need in square feet and square yards from room size, roll width, and waste. Compare…

Count characters with and without spaces as you type. Optional limit, remaining characters, and UTF-8 bytes.…

Free charity calculator: estimate donations by income, percentage, or a fixed gift. Compare monthly and…

Circuit load calculator: add appliance watts on an existing circuit → amps, breaker load %, remaining…

Check foreground and background colors against WCAG 2.2 AA and AAA, including UI/non-text 3:1, alpha…

Generate random, complementary, analogous, triadic, or image-based color palettes and copy HEX, RGB, HSL,…

Calculate nCr (n choose r) with exact integers, formula steps, and optional repetition. Runs in your browser.

Calculate compost from area and depth — cubic yards, cubic feet, liters, and bags. Optional buffer. Runs in…

Calculate concrete for slabs, footings, post holes, and steps — cubic yards, cubic feet, cubic meters, and…

Convert a GLB, STL, or OBJ to PNG or JPG in your browser. Transparent PNG and square thumbnails. The file…

Compare U.S. city cost of living and estimate the salary needed to keep similar purchasing power. Optional…

Design custom CSS buttons with a live preview. Customize colors, gradients, hover effects and shadows, then…

Generate responsive CSS clamp() values for font size, padding, margin, gap, and spacing. Live preview, rem/px…

Create CSS clip-path shapes visually with draggable polygon points, circle, ellipse, and inset controls, live…

Create CSS image filters with live preview. Adjust blur, brightness, contrast, grayscale and more. Upload…

Create CSS gradients online with live preview. Customize colors, angles, opacity and stops; copy linear,…

Free CSS Grid generator — build rows, columns, gaps, and named areas visually, then copy CSS, HTML, Tailwind,…

Create CSS text shadows, glow, neon, outline, and 3D type. Edit up to eight layers, then copy CSS or…

Convert px, rem, em, %, vw, and vh with root, parent, and viewport context. Copy CSS in your browser.

Free date calculator to add or subtract days, weeks, months, or years, find days between dates, and count…

Find sale price and savings from a percent or dollar off. Stack coupons, estimate sales tax, or reverse the…

Calculate drain pipe fall, slope per foot, percent grade, and slope ratio. Includes 1/4 and 1/8 inch presets…

Free drywall calculator for walls and ceilings. Estimate 4×8, 4×10 or 4×12 sheets, waste, joint compound,…

Calculate HVAC duct CFM from duct size, velocity, tons, or cooling BTU, and find a practical duct size. Runs…

Calculate HVAC duct size from CFM and velocity or friction rate, for round, rectangular, and flex duct. Runs…

Free electricity cost calculator: convert watts to kWh, estimate appliance costs and monthly bills from your…

Track employee work hours, unpaid breaks, overtime, and weekly timesheets for multiple employees. Optional…

Calculate powers, negative and fractional exponents, and missing exponents or bases, with steps. Runs in your…

Calculate n! instantly with exact results up to 1000!. See step-by-step multiplication, digit count, trailing…

Estimate fascia boards from eave and rake lengths: linear feet, 8–16 ft stock, waste, and optional material…

Create favicon.ico, PNG icons, Apple Touch, and PWA icons from an image, initials, or emoji. Runs in your…

Estimate posts, panels, pickets, rails, concrete, and optional cost for wood, vinyl, or chain-link fences.…

Free flooring calculator for vinyl plank, laminate and hardwood. Estimate square feet, boxes, waste,…

Add, subtract, multiply, divide, simplify, compare, and convert fractions, mixed numbers, decimals, and…

Calculate freelance hours, billable time, and earnings from your hourly rate. Track breaks and multiple…

Calculate a freelance hourly rate, day rate, and project price from take-home income, expenses, tax, and…

Calculate French drain gravel in cubic yards and tons, pipe length, landscape fabric, slope drop, and…

Calculate trip gas cost from miles, US MPG, and pump price. See gallons, cost per mile, round-trip and split…

Estimate furnace size, heating load, and input BTU/hr from square footage, climate, insulation, ceiling…

Find the greatest common factor (GCF) of 2 or more numbers instantly. See prime factorization, common factors…

Create frosted-glass CSS with live preview. Adjust blur, tint, borders and shadows, then copy CSS, Tailwind…

Free online GLSL shader editor with a live WebGL preview. Edit vertex and fragment shaders, read compiler…

Free gold Zakat calculator for 14K–24K jewelry, coins and bars. Enter grams or ounces, check nisab, and…

Calculate semester, cumulative, weighted and unweighted GPA in seconds. Enter grades and credits, plan your…

Calculate grass seed needed for your lawn in seconds. Get pounds, bags, coverage and cost for new lawns or…

Calculate cubic yards, US tons, bags, and optional cost for driveways, paths, and patio bases. Runs in your…

Free gutter calculator for linear feet, gutter sections, downspouts, hangers, waste, and optional material…

Five heart rate zones and Zone 2 BPM from age, Tanaka, measured max, or Karvonen. Runs in your browser —…

Estimate a heat pump planning range in tons plus cooling and heating BTU/h from home size, climate,…

Calculate peak hot water GPM, temperature rise, and tankless BTU from fixtures that run together. Runs in…

Calculate hourly pay as weekly, biweekly, monthly, and annual gross. Optional overtime and unpaid weeks. Runs…

Calculate hours between two times or dates. See hours, minutes, and decimal hours, including overnight spans.…

Ideal weight by height using Devine, Robinson, Miller, and Hamwi, plus the adult healthy BMI range, in kg and…

Blend two images online with 16 modes or add CSS color overlays. Preview live, download PNG/JPEG/WebP, copy…

Free insulation calculator for attics, walls and floors. Estimate batts, blown-in bags, spray foam board…

Calculate landscape fabric rolls from bed size, roll size, seam overlap, waste, and a feasible cutting plan.…

Calculate landscape rock in cubic yards, US tons, and bags from bed size, depth, and planning density.…

Find the least common multiple of 2 to 20 integers with prime factorization, listing, ladder, and GCF steps.…

Calculate lean body mass in pounds or kg using body fat % or Boer, James and Hume formulas. Compare results…

Calculate logarithms in any base, including log10, ln, and log2, with change-of-base steps and reverse…

Generate Lorem Ipsum by paragraphs, words, sentences or exact characters. Copy dummy text as plain text, HTML…

Calculate daily protein, carbohydrate, and fat grams for weight loss, muscle gain, or maintenance. Pounds or…

Calculate meal cost per serving from ingredient prices, pack sizes and portions. Scale recipes, plan weekly…

Paste a list to find mean, median, and mode with steps. Also shows range, quartiles, IQR, outliers, and…

Find safe thawing times for frozen chicken, ground beef, roasts and turkey. Compare fridge vs. cold water and…

Count metal roof panels from eave width and installed coverage, then see squares, slope length, and optional…

Plan take-home income, expenses, savings, and a 50/30/20 or custom split. See the monthly surplus in your…

Calculate bags, cubic yards, and optional bulk-versus-bag cost from bed size and depth. Multiple beds and…

Build soft UI CSS from a surface color. Preview cards, buttons, inputs, and toggles, then copy CSS, Tailwind,…

Free online notepad — write notes in your browser with autosave, multiple notes, find & replace, and…

Convert oven temperatures between °F, °C, fan/convection, and gas mark. 350°F is 176.7°C exactly, usually…

Calculate overtime hours from a weekly total, a daily shift with unpaid breaks, or a seven-day timesheet.…

Calculate U.S. overtime pay at 1.5× or 2×. See regular pay, overtime wages, extra premium, and weekly gross.…

Estimate your fertile window, ovulation date, and next period from your last period. Six-day core window,…

Free paint calculator: room, wall, or known area → gallons and quarts. Four-wall math, door/window…

Generate strong random passwords, memorable passphrases, and numeric PINs in your browser. Set length and…

Free paver calculator: patio area, paver size, and cut waste → paver count, boxes, and pallets. Backyard…

Find X% of a number, what percent, missing whole, increase, decrease, change, and reverse %. Runs in your…

Calculate nPr with or without repetition. Exact BigInt results, steps, and 26P3 = 15,600 (not 17,576). Runs…

Calculate your dog or cat's age in human years using age, months and dog size. See a quick age comparison,…

Calculate how much PEX tubing you need in linear feet, add waste, and round up to full coils. Free PEX…

Estimate pipe diameter and nominal size from GPM and velocity, check an existing bore, or total fixture…

Free pipe volume calculator: inside diameter and length → US gallons, liters, cubic feet, water weight, and…

Calculate pizza dough flour, water, salt, yeast, and ball weights for Neapolitan, New York, and Detroit…

Calculate planet distances in AU, km and miles. Compare planets from the Sun, Earth-to-planet distances,…

Compare planet sizes side by side. See Earth, Jupiter, Saturn, Mars and every planet by diameter, volume and…

Convert Earth days to Mars sols, Jupiter days, and other planetary days. Compare planet day lengths in your…

Convert years between Earth, Mars, Jupiter, Saturn, Uranus, Neptune and more. See planetary year lengths and…

Find how many plants fit a garden bed, row, or square-foot grid. Layout preview and nursery packs. Runs in…

Free pregnancy due date calculator: last period, conception, IVF, or ultrasound to estimate due date, weeks…

Check if a number is prime, factor it, list primes from 1 to 100 or 1000, find a range or the nth prime. Runs…

Single-event, AND/OR, conditional, and repeated-trial probabilities with steps, percents, and odds. Runs…

Gross profit, margin, markup, and selling price from a target margin. Optional shipping and fees as a…

Daily protein grams from weight (lb or kg), activity, and goal — plus a planning range, per-meal split, and…

Calculate cubic feet, cubic yards, and bags for rectangular or round raised beds. Mix splits and optional…

Free random string generator — alphanumeric, hex, URL-safe, custom alphabets, and bulk TXT/CSV export. Web…

Generate random English words for writing, Pictionary, and Charades. Filter by nouns, verbs, letters, and…

Simplify ratios, solve A:B = C:D, split a total, compare equivalents, and convert to percents. 12:18 → 2:3.…

Paste text or enter a word count to estimate reading and speaking time. 1,000 words at 200 WPM is 5 minutes.…

Free recipe scaler calculator to double, halve, or resize any recipe for your serving size. Scale a full…

Remove extra spaces, double spaces, tabs, and blank lines from text in your browser. Free, private, with copy…

Count retaining wall blocks, courses, buried rows, caps, and gravel volume from wall length and block face…

Free rice to water ratio calculator: cups of dry rice and rice type → how much water for stovetop cooking.…

Calculate roof area and square footage from length, width, pitch, and overhang. Get roof surface area,…

Calculate roof pitch from rise and run instantly. Get pitch, angle, slope %, rafter length and roof pitch…

Calculate roof area, roofing squares, shingle bundles, underlayment and material cost from roof dimensions…

Pace, finish time, or distance from any two values. Min/mile and min/km, official race distances, splits, and…

Calculate 2026 U.S. take-home pay after federal income tax, Social Security, Medicare, and state tax. See…

Convert annual, monthly, or biweekly gross pay to an hourly rate. Default 40 × 52 = 2,080 hours. Paid PTO and…

Free sand calculator: cubic yards, US tons, and 50-lb bags from area and depth. Fill, pavers, sandboxes, and…

Free online scientific calculator for trig, logs, powers, roots, and factorials. DEG/RAD/GRAD, keyboard…

Use our free septic tank calculator to estimate the right tank size from bedrooms, occupants and wastewater…

Free sleep cycle calculator for bedtime and wake-up times. 90-minute cycle estimates, time in bed vs asleep,…

How much sod do I need? Measure lawn shapes, subtract hardscape, add waste, then get square feet, pallets,…

Free soffit calculator: eave length × soffit depth → square footage, waste, optional panels, cost, and soffit…

Estimate space heater cost per hour, day, month, and season from watts, hours, and a cents-per-kWh rate. Runs…

Create a 4px or 8px spacing scale with px/rem values. Export CSS variables, Tailwind, SCSS and JSON design…

Find square roots with simplified radicals, decimals, perfect-square checks, and steps. √72 = 6√2. Fractions…

Sample or population standard deviation with variance, mean, and steps. Paste a list or an exact-value…

Convert steps to miles or kilometers instantly. See 5,000–20,000 steps using height or measured step length.…

Calculate how many hours to study per day or week for an exam, semester, or course. Plan by total hours,…

Free sump pump calculator: measured pit inflow or rainfall estimate → required GPM, GPH, TDH, and duty point.…

Calculate sunrise, sunset and daylight on Mars, Venus, Mercury and other planets. Adjust latitude and season…

Free SVG color changer — recolor fills and strokes, resize, adjust stroke width, convert to currentColor,…

Convert SVG to JSX or a React TypeScript component in your browser. Fixes attributes, previews the icon, and…

Search Tailwind CSS v4 and v3 utility classes by name or CSS property. Preview, compose, and copy—runs in…

Convert text to uppercase, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case in…

How many tiles and boxes you need for floors, showers, and backsplashes — square footage, waste, and optional…

Calculate 1.5× overtime: time-and-a-half rate, OT pay, premium, and weekly gross from an hourly wage.…

Free time calculator to add or subtract hours and minutes, find time between two times, and total durations…

Calculate the exact elapsed time between two times or dates in hours, minutes, and seconds, including…

Free time zone converter for any date and time. Convert EST, PST, CST, UTC and cities worldwide with…

Free tip calculator for restaurants and delivery: 15–25% presets, custom tip, optional tax, equal or unequal…

Calculate cubic yards, bags, and optional cost for lawns and garden beds. New-lawn and topdressing depths.…

How much turkey per person: adults, kids, whole bird or breast, and leftovers. Default 1¼ lb raw whole turkey…

Create modular or fluid typography scales with live preview. Export CSS variables, clamp(), Tailwind, or JSON…

Compare grocery and package prices by ounce, pound, liter, or item. See the cheaper option and savings in…

Convert Unix timestamps (epoch time) to dates and dates to Unix timestamps. Seconds, milliseconds, UTC, local…

Calculate voltage drop in volts and percent for DC, single-phase, and 3-phase circuits. Check AWG size,…

How many wallpaper rolls you need for a room or accent wall — whole-drop packing, pattern repeat, US double…

Size a storage tank from peak-hour demand and First Hour Rating, or a tankless heater from GPM, temperature…

Estimate daily water in US fluid ounces, cups, liters, and milliliters from body weight and optional exercise…

Enter your Earth weight in lb or kg to see what you'd weigh on Mars, the Moon, Jupiter and every planet.…

Calculate window AC electricity cost per hour, day, month, or summer from watts or BTU/EER and your kWh rate.…

Estimate AWG wire size from amps or watts, check voltage drop, compare copper or aluminum, and convert AWG to…

Free online word counter — live words, characters, sentences, paragraphs, reading time, and word goals. Runs…

Free word frequency counter — rank words and phrases, see keyword density, and export CSV. Runs in your…

Calculate hours worked from clock-in and clock-out times. Deduct lunch, total weekly or biweekly hours, see…

Convert active dry, instant, and fresh yeast in grams, teaspoons, ounces, and packets. Default 1:1 dry swap…

Estimate Zakat on cash, savings, gold, silver, investments, and business assets. Choose gold, silver, or…