Other Tools

QR generator/scanner, password generator, color converter, card maker, and more handy utilities.

74 tools

Signature Maker

Draw a signature and save as transparent PNG.

QR Code Generator

Generate QR codes for text, URL, Wi-Fi, contacts.

QR Code Scanner

Read QR codes from camera or image files.

PPT Media Extractor

Extract images and videos from PPT at once.

PPT Slide Extractor

Pick specific slides and save as a new PPTX.

Password Generator

Generate secure random passwords instantly.

Color Converter

Convert between HEX, RGB, HSL color codes.

Timestamp Converter

Convert between Unix timestamp and date.

UTM Link Builder

Generate UTM parameter links for marketing.

Unit Converter

Convert length, weight, temperature, area, time, and data units — including pyeong (Korean).

Age Calculator

Calculate international age, Korean age (counting), year-age, and D-day to next birthday.

D-day Calculator

Count days to or from any date. Auto-suggests 100 / 1000-day anniversaries.

CSS Gradient Generator

Build linear, radial, and conic gradients visually and copy the CSS.

BMI Calculator

Compute BMI, ideal weight, and BMR from height & weight. Korean (KSSO) and WHO thresholds shown together.

Box Shadow Generator

Build CSS box-shadow visually with multi-layer and inset support, then copy the code.

World Time Converter

Compare times across Seoul, NYC, LA, London, Tokyo and more — DST handled automatically.

Random Picker

Pick lunch, names, or numbers at random — with a roulette animation and multi-pick support.

WCAG Color Contrast Checker

Check contrast ratio and WCAG AA/AAA pass status for any foreground/background pair.

Loan Calculator

Compare monthly payments and total interest across equal-payment, equal-principal, and balloon repayment schedules.

Split-Bill Calculator

Split a bill evenly or settle when people paid different amounts — see who owes whom with the fewest transfers.

Korean Salary Net Pay Calculator

Enter annual gross salary; auto-deducts 4 social insurances + income tax + local tax. Monthly/yearly net pay and itemized breakdown.

Sleep Time Calculator

Plan wake-up or bedtime based on 90-minute sleep cycles so you wake between cycles, not in deep sleep.

Aspect Ratio Calculator

Change one dimension and the other auto-scales to keep the ratio. Presets for 16:9, 4:3, 9:16, 1:1, with a visual preview.

CSS Cubic Bezier Editor

Edit CSS animation easing functions on an SVG curve. Drag control points, preview the motion live, copy the CSS.

Working Days Calculator (Korea)

Count business days between two dates with Korean public holidays excluded. Optional Saturday-as-working setting and a list of holidays in range.

Pomodoro Timer

25-min focus, 5-min break cycles with audio alerts and a circular progress ring. Customizable durations.

VAT Calculator

Add or extract VAT in two directions. Korea 10% default; configurable rate including 0% (zero-rated / exempt).

Stopwatch & Timer

Stopwatch (0.01s precision, lap times) and countdown timer with audio alert — on one screen.

mailto Link Generator

Build mailto: URLs and HTML <a> tags from to / cc / bcc / subject / body fields. Drop into your "Contact" link.

Date Calculator

Add or subtract days, weeks, months, and years from a date — or get the exact duration between two dates (years/months/days + total days).

CSS Unit Converter

Convert between px, rem, em, pt, and % at the same time, with adjustable root and parent font sizes.

Discount Calculator

Compute sale price and savings from price + percent, or stack multiple discounts (10% + extra 5%).

OG Meta Tag Generator

Generate Open Graph and Twitter Card meta tags with KakaoTalk, Facebook, and X preview cards.

Card News Maker

Create card news images with text and colors.

CSS clip-path Generator

Visually edit polygon, circle, ellipse, and inset clip-paths. Draggable vertices, live preview, 8 ready-made shapes.

Border Radius Generator

Visually tune each corner radius. Simple and advanced (elliptical / fancy) modes, live preview, copy CSS.

Color Palette Generator

Generate harmonious palettes from a base color: complementary, analogous, triadic, tetradic, and monochromatic. CSS-variable output.

Subnet Calculator (CIDR)

Type IPv4 CIDR (e.g. 192.168.1.0/24) and get network, broadcast, mask, host range, and total IPs.

Text Shadow Generator

Build multi-layer CSS text shadows visually and copy the code. Live preview with font, size, and color controls.

CSS Filter Playground

Tweak blur, brightness, contrast, grayscale, hue-rotate, saturate, sepia, invert, and opacity with live sliders. Upload your own image or use the sample preview.

vCard (.vcf) Generator

Enter name, phone, email, organization, etc. and download a .vcf contact file instantly. Adds to iOS / Android contacts in one tap. Pick vCard 3.0 or 4.0.

iCal (.ics) Event Generator

Enter title, time, location, reminder, and recurrence to download a .ics calendar file. Drops straight into Google / Apple / Outlook calendars.

CSS Transform Generator

Tweak translate, rotate, scale, and skew with live sliders. 2D and 3D transforms, transform-origin, and perspective supported. Copy the code in one click.

Cooking Multi-Timer

Run multiple kitchen timers at once with quick presets for ramen, eggs, microwave, and tea. Alarm sound + browser notification, works on mobile, survives page reload.

Lunar ↔ Solar Calendar

Convert between lunar (Korean / Chinese) and solar (Gregorian) dates. See your relatives' lunar birthdays, anniversaries, and ancestral rite dates in upcoming Gregorian years. Zodiac and sexagenary stem-branch shown. 1900–2099 supported.

Password Strength Checker

Instantly see how strong a password is before signup or change. Length / character variety / common-pattern checks plus estimated crack time. Your input never leaves the browser.

Interval Workout Timer

HIIT / Tabata / circuit timer that auto-cycles work / rest / rounds / sets. Countdown beeps, screen-on lock, quick presets (Tabata, HIIT, EMOM).

Recipe Scaler

Scale a recipe from 2 servings to 4 (or any ratio). Enter ingredients with quantity and unit; the tool recalculates with friendly fractions (1/2, 1/3) and lets you copy a chat-ready text. Includes a quick units cheat-sheet.

Unit Price Calculator

Compare deals like "100g for $5 vs 250g for $12" instantly. Auto-computes price per gram / ml / unit, highlights the cheapest, shows the savings.

Pregnancy Week & Due Date

Compute current pregnancy week, due date, trimester, prenatal-care milestones, and Korean 90-day maternity-leave dates from your last period (LMP) or conception date.

Korean Holidays & Long Weekends

Auto-computed list of Korean public holidays with D-day. Eight fixed solar holidays plus three lunar ones (Lunar New Year, Buddha's Birthday, Chuseok), substitute holidays, and 3+ day long weekends detected.

Korean BRN Validator

Validate a Korean Business Registration Number (10 digits) with the NTS checksum algorithm. Auto-classifies into individual / corporation / non-profit / tax-exempt by the 4th–5th digits. Input never leaves the browser.

Fuel Economy Calculator

Enter distance, fuel volume, and cost per fill-up to compute fuel economy (km/L), cost per km, and running averages. Records saved locally; CSV export.

Korean Severance Pay Calculator

Calculate Korean severance pay under the Labor Standards Act. Enter hire date, leave date, last 3 months' wages, annual bonus, and unused-leave pay to get average daily wage, service period, and projected severance. Input never leaves your browser.

Korean Annual Leave Calculator

Calculate Korean statutory annual paid leave under Labor Standards Act §60. Enter hire date for under-1-year monthly leave (up to 11 days), 1+ year base 15 days, and 3+ year bonus leave (up to +10 days). Supports both hire-date and fiscal-year (Jan 1) bases.

Percentage Calculator

Five percentage operations in one place: N% of X, X is what % of Y, X plus/minus N%, and X → Y percent change. For students, shopping, taxes, statistics. Live results, thousands separators.

Time Calculator

Three time operations: duration between two times (9:00–18:00 = 9 hours), add/subtract time, and sum multiple durations (8:30+2:45). For work hours, exercise, study, runtime. Handles midnight crossover and break deduction.

BMR & Calorie Calculator

Compute Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation, plus cut/maintain/bulk calorie targets and protein/water recommendations. For diet and bulking plans.

Savings & Deposit Calculator

Compute Korean savings-account and deposit interest. Supports monthly-deposit savings, lump-sum deposit, simple/compound interest, and 15.4% Korean withholding tax. Monthly accumulation table included.

Wage Converter (Hourly · Monthly · Annual)

Two-way converter for hourly, daily, weekly, monthly, and annual wages. Default 209 hours/month (40 hr/week + Korean paid weekly rest), adjustable. For part-timers, employees, and freelancers.

Shoe Size Converter

Two-way converter for shoe sizes — Korea (mm) ↔ US ↔ EU ↔ Japan ↔ UK. Men, women, and kids modes. Type any field; the rest update instantly. Essential for international online shopping.

Korean Real Estate Broker Fee Calculator

Compute Korean statutory broker fees for sale, jeonse (lump-sum lease), and monthly rent — tiered rates with caps, plus 10% VAT. Monthly-rent converted-deposit auto-computed.

Clothing Size Converter

Two-way clothing size converter — Korea (호수) ↔ S/M/L ↔ US ↔ EU ↔ Japan. Men, women, and kids (height cm) modes, with chest measurement reference.

Korean School Grade Calculator

Enter a child's birthdate to get the current Korean school grade, semester, and days until the next academic year. Korean school year starts March 1; uses the 2023 international-age law.

GPA Calculator

Compute GPA from per-course credits and letter grades, plus Korean 4.5 ↔ US 4.0 conversion with the WES guide. For university semesters, grad-school applications, study abroad, and resumes.

Child Height Predictor

Predict a child's adult height from the parents' heights using the medical mid-parental height formula, with a 95% confidence interval of ±8.5 cm.

Korean Car Tax Calculator

Calculate Korean annual vehicle tax under the Local Tax Act: engine displacement × per-cc rate + age discount + 30% local-education tax + 5% lump-sum discount. Supports passenger cars and EVs/FCEVs.

Korean Real Estate Acquisition Tax Calculator

Calculate Korean real estate acquisition tax under the Local Tax Act: 1-home tiered rates (1–3%), multi-home surtax (8/12%), regulated-zone, rural-special tax, and local-education tax with 85 ㎡ size split.

Korean 4 Social Insurances Calculator

Compute Korean 4 social insurances (National Pension, Health, Long-Term Care, Employment, Industrial Accident) — employee and employer shares per item. 2026 rates with tax-free allowance support.

Stock Average Price Calculator

Compute weighted-average cost basis from multiple buys, plus break-even price and live P&L when you enter a current price. Korean brokerage fees (0.015%) and sell tax (0.2%) applied.

Korean Housing Subscription Points Calculator

Compute Korean housing-subscription points under the Housing Supply Rules: years without home (32pt) + dependents (35pt) + savings-account tenure (17pt) = 84 max.

Korean Jeonse ↔ Monthly Rent Converter

Convert Korean jeonse (lump-sum lease) deposit ↔ monthly rent (deposit + monthly). Auto-applies the Housing Lease Protection Act conversion-rate cap (base rate + 2% or 10%, whichever is lower).

Calorie ↔ Exercise Time Calculator

Convert food calories into exercise time for 60+ common Korean foods and 15 activities. How many minutes of running to burn off ramen, fried chicken, or pork belly? MET-based calculation with your body weight.

Pet Age Calculator (Dog & Cat)

Convert your dog or cat's age to human-equivalent age. AVMA-based formula by dog breed size (small/medium/large/giant) and a separate cat formula. Life stage and average lifespan included.

About Other Tools

Tools that don't fit a single category but show up in daily life. Salary and savings calculators, diet calories, real-estate fees, expense splits, QR codes, color conversions — at least one or two are part of someone's day, every day.

Many tools are Korea-specific: salary take-home reflects national pension/health/employment/income tax accurately; real-estate acquisition tax covers multi-home surcharges; school-grade calculator accounts for both the abolished early-entry rule (2009) and the 2023 international-age law. These fill gaps that global tools simply don't address.

Personal-finance and tax tools change every year as laws and rates update; we refresh them as quickly as we can. Still, all results are estimates — for real transactions or filings, confirm with the official systems (Wetax, Hometax) or a tax professional.

What people use it for

Verify your pay stub

Subtract the four social insurances + income/local tax from gross salary to get take-home. Compare with the company-issued slip. Wage converter for hourly ↔ monthly ↔ annual.

Pre-check real-estate tax & fees

Acquisition tax, broker fee, jeonse ↔ monthly conversion, subscription points. Multi-home surtax / regulated zone / 85 ㎡ size split all handled.

Stocks & savings

Average buy price for shares, savings/deposit interest at maturity, loan monthly payment. Korean brokerage fee, bank simple interest formula.

Diet & health

BMR, food calories → exercise minutes, BMI, pregnancy weeks, child height predictor, pet age converter.

School & family schedules

Korean school grade (international-age law applied), GPA conversion (Korea 4.5 ↔ US 4.0), due date, Korean holidays D-day.

Which tool to pick

Salary & work Take-home, wage converter, four insurances, severance, annual leave, time math.
Real estate Acquisition tax, broker fee, jeonse ↔ monthly, subscription points, loan calculator.
Finance Savings/deposit interest, stock average price, loan.
Health & diet BMI, BMR, calorie ↔ exercise, pregnancy weeks, sleep.
Family & kids School grade, height predictor, GPA, pet age, Korean holidays D-day.
Everyday utilities Percent, unit converter, discount, split bill, QR generate/scan, color converter.

FAQ

When are tax/rate figures from?

Most Korean rates are as of 2026. Items that change every January (car tax discount, pension cap, minimum wage, etc.) are updated quickly; still, verify before filing.

Why is the take-home slightly different from my pay stub?

Tax-free items (200k meal allowance, commuting allowance), dependents, special deductions vary by employer. The tool uses standard defaults; ±tens of thousands is normal.

Can I rely on a result for a real transaction?

No — treat results as estimates. For real estate, verify via Wetax or a CPA; for taxes, file via Hometax or your tax office.

Is this medical or legal advice?

No. BMI/BMR/calorie tools are general references, not diagnoses; tax/lease tools are not legal advice. Consult a professional for important decisions.

Can I share results?

Most tools allow copying the result text. Some (QR generator, color converter, etc.) export images.

The goal is a single place for everyday Korean calculation / conversion / verification, filling high-search gaps first. If a tool you want is missing, drop a note via the email or Discord at the bottom of the home page.

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