Web Tool Hub
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Date & Time
Fun & Random
Text & Code
Image & Media
Health & Fitness
General Calculators
Salary & Labor
Savings & Loans
Real Estate
Stocks & Investing
Tax
Insurance
Creator Revenue
Business & E-commerce
Date & Time
D-Day Calculator
Days remaining until (or since) a target date
UTC & Time Zone Converter
Live world clock and instant date/time conversion between time zones
Sunrise & Sunset Times
Sunrise, sunset, solar noon and day length for any city or your current location, on any date
High Tide & Low Tide Times
Estimated high and low tide times for any coastal city or your current location, on any date
Moon Phase Calculator
Today's moon phase, illumination percentage, and the next new moon and full moon dates
Korean Age Calculator
Enter a birth date to see your Korean international age (man-nai), counting age (se-nai), and year age (yeon-nai), plus days until your next birthday
Date Difference Calculator
Enter a start and end date to see the total days between them, plus a years/months/days and weeks/days breakdown
Date Add/Subtract Calculator
Add or subtract days, weeks, months, or years from a date to instantly get the resulting date and weekday
Zodiac Cycle Calculator
Enter a birth year to see its Chinese zodiac animal, plus every other year sharing that animal and the age in each
Fun & Random
Daily Fortune
Today's love, money, health and career luck, monthly fortune, this year's fortune, zodiac sign and Chinese zodiac horoscope, based on your birth date
Dice Roller
Roll 1-6 virtual dice with d4-d100 sides and see the total instantly
Ladder Game (Ghost Leg)
Enter participants and results, generate a random ladder, and click a name to trace an animated path to its result
Lotto Number Generator
Generate 1-5 sets of 6 random lotto numbers from 1-45 instantly
Marble Draw (Raffle)
Write names or items on marbles, drop them in a jar, and draw them one by one at random, like a lottery raffle
Meal Recommender
Pick a cuisine and a meal time, then get a random meal combo suggestion for breakfast, lunch, or dinner
Name Reading
Enter a name for a fun letter-by-letter reading of its energy, personality strengths and weaknesses, best-fit field, and lucky color, number and direction
Blood Type Personality & Compatibility
See personality traits for each blood type and which blood types are the best (and worst) match for you
Devil Fruit Encyclopedia
Browse 59 One Piece Devil Fruits with their type, ability, and known holder — search by name, power, or character
MBTI Personality Test
A quick 20-question personality test that estimates your 4-letter MBTI type (E/I, S/N, T/F, J/P)
Text & Code
Character & Byte Counter
Live character count, count without spaces, UTF-8 byte size
JSON Formatter
Indent (pretty-print) or minify JSON instantly in your browser
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text instantly in your browser
Unicode Character Lookup
Inspect Unicode code points, UTF-8/UTF-16 bytes, and HTML entities for any text, or convert a code point back to a character
Country Codes
Look up ISO country codes (alpha-2, alpha-3, numeric) and international dialing codes for every country
Korean Name & Road Address Romanizer
Convert a Korean name or road address into standard romanized English spelling, based on the Revised Romanization of Korean
Cron Expression Generator & Explainer
Build a cron schedule with dropdowns and a drag-select grid, or paste one to explain it and see upcoming run times
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates and back, with a live real-time timestamp counter
Image & Media
Image Pixelator
Turn photos into blocky pixel-art mosaics by adjusting pixel size, right in your browser
Image Splitter
Slice a photo into a grid of pieces by row/column count or fixed pixel size, right in your browser
Image Converter
Convert multiple images at once to PNG, JPEG, or WebP right in your browser, no upload needed
Image Compressor
Shrink multiple image files at once right in your browser, no upload needed
Audio Converter
Convert multiple audio files at once to WAV, OGG, WebM, or M4A right in your browser, no upload needed
Sprite Sheet Maker
Combine multiple same-size images into a single grid sprite sheet, right in your browser
Health & Fitness
Protein Intake Calculator
Enter your body weight and activity level to calculate your recommended daily protein intake in grams
Water Intake Calculator
Enter your height, weight, and activity level to calculate your recommended daily water intake in liters
BMI Calculator
Enter your height and weight to calculate your Body Mass Index (BMI), weight category, and healthy weight range
Workout Set Timer & Log
Log each set's exercise, weight, and reps and automatically start a rest timer, with a total set count and volume summary
General Calculators
Exchange Rate Converter
Convert between 30 world currencies using daily reference rates from the European Central Bank
Scientific Calculator
Trigonometric, logarithmic, power/root, factorial, and memory functions, just like the Windows built-in scientific calculator
Percentage / Ratio Calculator
Enter values A and B and pick a calculation type to get percentages, ratios, and rates of change instantly
Probability / Combination Calculator
Enter total count (n) and selection count (r) to instantly get permutations (nPr), combinations (nCr), and factorial (n!)
Electricity Cost & Power Usage Calculator
Enter an appliance's wattage, daily usage hours, and your household's tariff tier to estimate daily/monthly power usage and monthly electricity cost
Salary & Labor
Korea Net Salary Calculator
Enter your gross annual salary (or monthly pay), non-taxable allowance, and number of dependents to see pension, health, long-term care, employment insurance and income tax deductions plus your monthly take-home pay
Severance Pay & Unused Leave Calculator
Enter your hire date, retirement date, recent 3-month base pay and bonus, and remaining annual leave days to estimate your average daily wage, expected severance pay, and unused annual leave allowance (Korea)
Hourly Wage & Weekly Holiday Pay Calculator (Korea)
Enter your hourly wage and weekly working hours to check weekly holiday pay (주휴수당) eligibility and compare your weekly and monthly pay with and without it included
Freelance Hourly Rate & Project Pricing Calculator
Enter your desired annual take-home income, annual fixed expenses (software, taxes, rent), weekly billable hours, and annual vacation days — instantly get the minimum hourly rate you must charge to break even, plus daily/monthly pricing guides and your effective take-home rate
Korea National Pension Estimated Benefit Calculator
Enter your years of enrollment and average income to estimate your monthly old-age pension benefit using Korea's National Pension basic pension formula
Retirement Pension (DB/DC/IRP) Estimated Payout Calculator
Choose your retirement pension plan type — DB, DC, or IRP — and enter your wage, contributions, years, and expected return to estimate your lump-sum payout and monthly pension amount
Unemployment Benefit Calculator (Korea)
Enter your age, employment insurance enrollment period (hire and separation dates), and total wages over your last 3 months to estimate your daily and total job-seeking benefit (구직급여)
Parental Leave Benefit Calculator (Korea)
Enter your ordinary monthly wage, planned parental leave length, and whether the 6+6 Parental Leave incentive applies to estimate your monthly and total parental leave benefit (육아휴직급여)
Regional Subscriber Health Insurance Calculator (Korea)
Enter your annual income and property tax base to estimate your 2026 South Korean regional (self-employed) health insurance premium (income + property portions), long-term care premium, and estimated total monthly payment
Savings & Loans
Compound Interest Savings Calculator
Enter an initial deposit, monthly contribution, annual rate, and term to calculate your maturity amount, pre-tax/after-tax interest, and a growth chart
Loan Repayment Comparison Calculator
Compare equal payment, equal principal, and lump-sum repayment for your loan — see monthly payments, total interest, and a full amortization schedule
DSR/DTI Loan Limit Calculator
Enter your annual income, existing debt payments, and new loan rate and term to estimate your maximum loan amount under Korea's DSR (Debt Service Ratio) and DTI (Debt to Income) lending limits
Didimdol & Newborn Special Loan Limit Calculator (Korea)
Pick the loan product (Didimdol Loan / Newborn Special Loan), then enter combined household income, net assets, and the home's purchase price to instantly check eligibility on income, assets, and price caps, and get an estimated LTV-based loan limit
Pension Savings & IRP Tax Credit Limit Calculator (Korea)
Enter your total salary (or comprehensive income) plus annual contributions to a pension savings account and an IRP to instantly see the tax-credit-eligible amount after the pension savings' own cap and the combined cap, the applicable credit rate, and your estimated tax credit
Overdraft (Revolving Credit Line) Account Interest Calculator (Korea)
Enter the average balance you actually drew on a Korean overdraft/revolving credit line account (마이너스통장), the annual interest rate, and the number of days used to instantly calculate the expected interest, daily interest, and a reference table by period, always using a fixed 365-day-per-year day-count
Real Estate
Pyeong ↔ Square Meter / Cubic Meter Converter
Enter width, length, and height to calculate area (m²) and pyeong, or convert pyeong and square meters directly
Pyeong ↔ Square Meter (m²) Converter
Enter a pyeong or square meter (m²) value to convert instantly, and add an exclusive rate (%) to calculate the actual usable area (pyeong) from the supply area
Real Estate Brokerage Fee Calculator (Korea)
Enter the deal type, property type, and transaction amount to calculate Korea's statutory maximum real estate brokerage fee (중개보수/복비) rate and amount, with and without VAT
Acquisition Tax Calculator (Korea)
Enter the purchase price, number of houses owned, and exclusive area to calculate Korea's acquisition tax rate and amount, plus local education tax and special rural development tax
Rental Yield Calculator (Leverage ROE)
Enter the purchase price, lease deposit, monthly rent, loan amount, and interest rate to calculate your annual rental yield, leveraged return on equity (ROE), and monthly net income after loan interest
Jeonse-to-Monthly Rent Conversion Calculator (Korea)
Enter your existing deposit and monthly rent, the deposit you want to convert to, and the statutory conversion rate (%) to calculate the appropriate monthly rent after conversion and the deposit needed to convert your rent into deposit
Real Estate Capital Gains Tax Calculator (Korea)
Enter the acquisition and transfer price, acquisition/transfer dates, residence period, and whether it's your only home in a designated speculation-control area to check 1-house tax exemption eligibility and estimate Korea's real estate capital gains tax (양도소득세)
Korea Housing Pension (Reverse Mortgage) Estimated Payout Calculator
Enter your age and home value to estimate your monthly payout under Korea's Housing Pension (reverse mortgage) lifetime fixed-payment scheme
HUG Jeonse Deposit Return Guarantee Insurance Premium Calculator
Enter your jeonse deposit, guarantee period, and guarantee rate to estimate your HUG (Korea Housing & Urban Guarantee Corporation) jeonse deposit return guarantee insurance premium — includes an editable rate field and a debt-ratio based suggested-rate helper, since HUG's official rates change over time
Korean Housing Subscription (Cheongyak) Priority Score Calculator
Enter your birth date, marriage/homeless-since dates, number of dependents, and subscription account join date — instantly calculate your Korean apartment subscription (cheongyak) priority score out of 84, broken down by the three official categories
Comprehensive Real Estate Tax Calculator (Korea)
Enter your total government-assessed home value, number of houses owned, and fair market value ratio to estimate Korea's comprehensive real estate tax (종합부동산세/종부세), including the senior/long-term holding tax credit and special rural tax
Property Tax Calculator (Korea, 재산세)
Enter your home's government-assessed standard value, fair market value ratio, whether the single-house special rate applies, and whether the urban area tax applies, to calculate Korea's property tax (재산세) including local education tax and urban area tax
Stocks & Investing
Stock Average Price (Cost Averaging) Calculator
Enter your existing share holdings and average price, plus the quantity and price of a new purchase, to calculate your new total shares, average cost, and total invested amount
Stock Trading Fee & Tax Calculator
Enter your buy/sell price, quantity, market, and brokerage fee rate to calculate gross trading profit, brokerage fees, securities transaction tax or overseas capital gains tax (22%), net profit rate, and actual proceeds
Target Return Price Calculator
Enter your current buy price, quantity, and target return rate (%) — for domestic (KOSPI/KOSDAQ) stocks, get the target sell price and net profit after brokerage fees and securities transaction tax; for overseas (US) stocks, after FX rate and capital gains tax; domestic stocks also show expected gain/loss at the upper/lower price limit (±30%)
US Stock Exchange Rate & Tax Calculator
Enter buy/sell exchange rates, buy/sell price per share ($), and quantity to calculate the KRW-based profit split into price gain and FX gain/loss, plus estimated capital gains tax (22%, with the ₩2,500,000 annual deduction) and final after-tax return
Dividend & Dividend Income Tax Calculator (Korea)
Enter shares held, dividend per share, current share price, and dividend frequency (monthly/quarterly/annual) to calculate your pre-tax and after-tax dividend income (15.4% dividend income tax) and dividend yield, plus a projected compound growth chart if you choose to reinvest dividends
Crypto DCA & Profit Calculator
Enter your recurring investment amount, frequency, term, and expected return (or average buy price) to calculate total principal, projected value, and profit
Upbit & Bithumb Trading Fee & Profit/Loss Calculator
Select an exchange (Upbit 0.05% / Bithumb 0.04% / custom) and enter your buy and sell amounts — instantly calculate buy/sell fees and your net profit/loss and net return rate after fees
Tax
Korea Comprehensive Income Tax Calculator
Enter your annual revenue, necessary expenses, and number of dependents to calculate your comprehensive income amount, tax base, calculated tax, local income tax, and estimated total tax payable
Korea Inheritance & Gift Tax Calculator
Enter the inherited estate value (with spouse and children) or the gift amount and your relationship to the donor to estimate Korea's inheritance tax or gift tax after standard deductions
Korea Year-End Tax Settlement Refund Calculator
Enter your gross annual salary, taxes already withheld, dependents, and common deductions (card usage, pension savings, insurance premiums, medical expenses, donations) to estimate your expected year-end tax settlement refund or additional payment
Car Tax Calculator (Korea)
Enter engine displacement and years since first registration to calculate Korea's annual vehicle tax for non-commercial passenger cars, plus local education tax and the two installment amounts
VAT Calculator (Value-Added Tax)
Switch between VAT-exclusive (supply price) and VAT-inclusive (total price) input mode, enter an amount and a VAT rate (10% by default, fully editable) to instantly calculate the supply price, VAT amount, and total price
Overseas Purchase Customs Duty & VAT Calculator (Korea)
Choose the shipping origin (US / other), enter the item price and shipping cost (USD), today's exchange rate and the item's duty rate to instantly check whether it's under Korea's de minimis threshold and calculate the estimated customs duty, VAT, and total payment
Insurance
Supplementary Health Insurance Reimbursement Calculator (Korea)
Enter treatment type (inpatient/outpatient), hospital tier, covered/non-covered treatment cost, and your policy generation (1st–4th gen) to estimate your self-pay deductible and expected reimbursement, including a detailed breakdown for the 3 major non-covered items (manual therapy, non-covered injections, MRI/MRA)
Monthly Income-Based Insurance Premium Calculator
Enter monthly net income, household income type (single/dual income), number of dependents, and housing type (own/rent) to get a recommended monthly insurance budget range based on the 7–10%-of-income guideline, a recommended protection vs. savings/pension insurance allocation split, and — if you enter your current premium — an over/under-payment diagnosis
Insurance Surrender (Early Cancellation) Loss Calculator
Enter your monthly premium, total months paid, and current estimated surrender value to calculate total principal paid so far, the net loss from cancelling now, and the loss rate / principal recovery rate versus what you paid in
Critical Illness (Cancer/Stroke/Heart) Diagnosis Coverage Calculator
Enter your current average monthly household living cost, number of dependents, and expected treatment/recovery period (1-3 years) to calculate the living-cost coverage needed to bridge an income gap during treatment, statistical average treatment costs, and the total recommended diagnosis coverage for cancer, cerebrovascular disease, and ischemic heart disease
Car Insurance Accident Surcharge Score & Grade Estimator
Enter current discount/surcharge grade, accident count in the last 3 years, and accident claim amount → get the added accident score, the expected grade change at renewal, the 3-year premium impact, and a self-pay vs. insurance-claim benefit comparison
Creator Revenue
YouTube Ad Revenue Calculator
Enter your monthly views, channel category, CPM, and monetized view rate — instantly estimate your monthly and yearly YouTube ad revenue, RPM, and the split between your share and YouTube's cut
TikTok Earnings Calculator
Enter your monthly views, monetization program, RPM, LIVE gift diamonds, and brand sponsorship income — instantly estimate your monthly and yearly TikTok earnings broken down by revenue source
CHZZK Revenue Calculator (Korea)
Enter your monthly Cheese donations, subscription revenue, settlement rate (standard 70% or preferential 75%), other income, and whether 3.3% withholding tax applies — instantly estimate your net monthly and yearly CHZZK streaming income
SOOP Star Balloon Revenue Calculator (Korea)
Enter your monthly Star Balloon count, settlement tier (general/best/partner BJ or custom), subscription (AdBalloon) revenue, other income, and whether 3.3% withholding tax applies — instantly estimate your net monthly and yearly SOOP streaming income
Naver Blog AdPost Revenue Calculator (Korea)
Enter your average daily pageviews, estimated click-through rate (CTR), average cost per click (CPC), and whether 3.3% withholding tax applies — instantly estimate your daily, monthly, and yearly Naver Blog AdPost revenue
Spotify Streaming Royalty Calculator
Enter your monthly streams, a per-stream royalty rate estimate, and your artist share percentage — instantly estimate your monthly and yearly Spotify royalty income
Twitch Subscription & Bits Revenue Calculator
Enter your subscriber counts by tier, subscription revenue share, monthly Bits, and other income — instantly estimate your net monthly and yearly Twitch streaming income
Business & E-commerce
Stripe & PayPal Fee Calculator
Enter a payment amount, choose Stripe or PayPal, and check international card fee if it applies — instantly see the net amount you'll receive after processing fees, and the gross amount you need to charge to actually net that amount
Amazon FBA Profit & Margin Calculator
Enter selling price, manufacturing + international shipping cost, product category, and package size tier/weight — instantly estimate Amazon's FBA fulfillment fee and referral fee, then see your net profit per sale, profit margin, and ROI
Delivery App Commission Calculator (Korea)
Enter your order amount and delivery platform (Baemin, Coupang Eats, Yogiyo, or a custom rate), payment (PG) fee rate, and delivery fee you cover — instantly estimate the VAT-inclusive fees and your expected settlement amount
App Store & Google Play Fee Calculator
Enter a sale amount, choose App Store or Google Play, and select the 30% standard or 15% reduced commission tier — instantly see your net payout after the store's cut, and the price you need to set to net a specific target amount
Naver Smart Store & Coupang Fee Calculator
Enter your selling price, cost, and platform (Naver Smart Store or Coupang) commission rate — instantly estimate your net profit and margin
Cafe & Convenience Store Break-Even Point (BEP) Calculator (Korea)
Enter monthly fixed costs (rent, labor, utilities, etc.) and average sale price with cost ratio (or variable cost per sale) to instantly calculate break-even revenue, break-even sales count, and the revenue needed to hit a target profit
Etsy & eBay Seller Fee Calculator
Enter your selling price, shipping, and each fee rate for Etsy or eBay — instantly estimate your net payout, profit, and margin
Freelance 1099 Quarterly Estimated Tax Calculator
Enter your expected annual net self-employment profit, self-employment tax rate, federal and state income tax rates, tax already paid, and remaining quarters — instantly estimate your total annual tax, self-employment tax breakdown, and the amount due each remaining quarter, with an IRS Form 1040-ES due date guide
Airbnb Host Income & Occupancy Tax Estimator
Enter annual gross booking revenue, Airbnb host fee rate, local occupancy tax rate, annual expenses, and estimated income tax rate — instantly estimate your after-tax net cash flow, income/expense breakdown, and the occupancy tax you may owe