Fast, ad-free-feeling calculators that run entirely in your browser. No sign-up, no downloads โ just instant, explained results.
Percent of a number, percentage increase/decrease, markup/discount, percentage points, and reverse percentage โ 7 modes in one tool.
๐ตUS tip presets (15/18/20/25%), even or uneven bill splitting, and a reverse "total to tip %" mode.
๐ฆDIM weight from package size (139/166 divisors), compared to actual weight, for the true billable shipping weight.
โฝTrip fuel cost from distance, MPG, and price per gallon โ plus fuel-type and route comparisons.
๐ฑLive USD currency and crypto rates, plus a manual-entry gold/silver spot-price calculator by karat.
๐คSpell out a dollar amount for checks โ "One thousand two hundred thirty-four and 56/100 Dollars."
๐ตFederal income tax by bracket for single, married, and head-of-household filers, with effective vs. marginal rate.
๐งพAdd or reverse-calculate sales tax by state, with real state rate references from 0% up.
๐ดGross-to-net paycheck estimate with federal tax, Social Security, and Medicare withholding.
๐คEstimate a severance payout by weeks-of-pay-per-year-of-service, plus WARN Act facts.
๐Monthly auto loan payment from price, down payment, trade-in, APR, and term.
๐Estimate buyer and seller closing costs on a home purchase or sale, itemized by state.
๐What a dollar amount in one year is worth today (or vice versa), using US CPI-U data back to 1913.
๐ท๏ธPrice after one or several stacked discounts, or reverse-calculate the original price.
๐ฆMonthly payment and amortization for personal, mortgage, or auto loans โ by amount, payment, or term.
๐นCompound interest on a CD or savings account by APY and compounding frequency.
๐๏ธHow much rent you can afford using the 30%-of-income guideline (and 25%/40% alternatives).
๐Estimated resale value over time for a sedan, truck, or luxury vehicle, year by year.
MD5, SHA-1, SHA-256, SHA-384, SHA-512 โ text or file, with expected-hash comparison.
โv1, v3, v4, v5, v7 UUIDs and ULIDs โ bulk generation, validation, and format conversion.
%Encode, decode, parse query strings, and break down full URLs into their parts.
.*Live match highlighting, capture groups, replace preview, and code snippets in 4 languages.
โฑEpoch โ date, live "now" counter, timezone handling, and bulk conversion.
โ ซNumber โ Roman numeral, date conversion, and a full reference table.
AaUPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case, and more.
/Turn titles into clean URL slugs โ single, bulk, reverse, and from-URL modes.
ฮฉ3โ6 band colorโohm and ohmโcolor, plus SMD code decoder.
๐จHEX, RGB, HSL, HSV, CMYK, OKLCH โ live-synced, with palette generator.
โWCAG AA/AAA contrast ratio, APCA score, and colorblindness simulation.
โฆScreen pixel density, print resolution, and required-pixels calculator.
โพConvert dates, find Islamic holidays, and check Hijri age.
MโLive side-by-side markdown editor and preview, with export.
๐ฒURL, WiFi, vCard, email, SMS, and plain-text QR codes โ instant preview, PNG/SVG download.
โUPC-A, EAN-13, Code 128, Code 39, and more โ instant preview, PNG/SVG download.
๐๏ธShrink photos by quality or target file size, resize, and convert JPEG/PNG/WebP โ 100% in your browser.
๐Convert iPhone HEIC photos to JPG/PNG, or combine them into a PDF โ no upload required.
PDFMerge, split, rotate, reorder, watermark, and compress PDFs, or turn images into a PDF.
๐ชชCrop any photo to the official US passport/visa size โ 2ร2 in, 1200ร1200 px at 600 DPI.
โWord, line, or character-level diff with side-by-side or inline highlighting of additions and deletions.
0x1Convert between binary, decimal, hex, and any base 2-36, plus an interactive bit-click and textโbytes mode.
๐๏ธValidate a US bank ABA routing number's checksum instantly.
๐ขCheck whether a Social Security Number matches valid SSA formatting rules โ format only, not identity verification.
Add, subtract, multiply, divide, simplify, and convert fractions โ with steps.
โฉGreatest common factor and least common multiple, with 3 solving methods.
!n!, double factorial, subfactorial, and Gamma function โ with big-number support.
xยฒFind roots from axยฒ+bx+c=0, or build an equation from known roots.
nCrnCr, nPr, with/without repetition, and circular permutations.
โทSolve direct, inverse, and compound proportions โ plus simplify and convert.
โPowers, roots, radical simplification, and a full expression evaluator.
2ยท3Is it prime? Factor a number, scan a range, or find the nth prime.
sinTrig, logs, roots, memory functions, and full expression input.
ยถLive word/character/sentence count, reading time, and keyword density.
๐Build an ATS-friendly US resume with live preview, templates, and PDF export.
โAPA 7 and MLA 9 citations for books, articles, websites, and more โ in-text and reference-list formats.
๐US, EU, and UK sizes for women's, men's, kids', and bra sizing โ US-first with brand-variation notes.
๐US, EU, UK, and cm shoe sizes for men's, women's, and kids' โ plus a foot-width fit guide.
โ๏ธAir conditioner size in BTU/h and tons from room square footage, climate zone, and conditions.
๐จGallons of paint or boxes of tile/flooring needed from room square footage, with waste factored in.
๐งVolume and surface area for cubes, cylinders, spheres, cones, and more โ inches, feet, or metric.
โญArea and perimeter for squares, rectangles, circles, triangles, and trapezoids โ feet or metric.
๐Length, weight, temperature, area, volume, and speed โ US customary and metric, both first-class.
๐Unweighted or weighted (Honors/AP) GPA on the US 4.0 scale, plus cumulative and grade-needed modes.
๐Convert an SAT score to its ACT equivalent (or back), using the official 2018 concordance table.
Exact age, next-birthday countdown, and age on any date or between two people.
๐ดBedtime or wake-up time based on 90-minute sleep cycles.
๐ธFertile window, ovulation day, and next period from your cycle.
๐พDog and cat age in human years, breed-size adjusted, plus life stage.
๐ฉธPredict a child's possible blood type from both parents' types.
๐๏ธBusiness days between two dates, or N business days from today โ US federal holidays excluded automatically.
โณDays between two dates, a live countdown to Christmas/Thanksgiving/New Year's and more, or add/subtract days.
๐ฅUS cups, tablespoons, and teaspoons to grams/mL for 24+ baking ingredients, plus an oven temp chart.
โ๏ธBody Mass Index from pounds and feet/inches, with ideal-weight range and daily calorie estimate.
๐งRecommended daily water in fluid ounces and cups, adjusted for activity, climate, and pregnancy.
๐TDEE and calorie deficit needed to reach a goal weight by a target date, in pounds per week.
๐ถWeight, length, and head-circumference percentile using WHO growth standards (birth-24 months).
๐Predict a child's adult height from both parents' heights, using the mid-parental height method.
๐คฐEstimated due date and current week from LMP, conception date, ultrasound, or IVF transfer.
Find your generation (Boomer to Gen Alpha) from your birth year โ Pew Research Center ranges and traits.
๐Focus/break cycles, stopwatch, countdown, alarm clock, focus sounds, and a 7-day stats chart.
๐A just-for-fun name-based love percentage with communication, passion, and trust sub-scores.
๐กType in options, spin an animated wheel, and let random chance decide โ with weighted slices and a fairness test.
๐Drag and drop items into S/A/B/C/D/F rows and export your tier list as an image.
๐ฎSun sign, approximate rising sign, daily horoscope, and zodiac compatibility โ all 12 signs.
Live Follower Counter โ
Animated live-style subscriber/follower counter for YouTube, TikTok, Instagram, and more โ plus an OBS overlay widget.
๐ฐCreator Earnings Calculator โ
Estimate YouTube AdSense, TikTok Creator Rewards, and Instagram earnings from monthly views โ 2026 US RPM ranges.