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Discover yourself

Made for Korea fans and expats

Things a Korean site explains best: how Korean age works, which animal sign you are, how saju compatibility is read, and what your name looks like in Hangul.

See all Korea & Culture tools

Money

Loans, savings, interest, dividends and everyday math, all in US dollars. See all Money tools.

• Loan Payment Calculator — monthly payment, total interest and a payment-by-payment schedule.
• Savings Interest Calculator — interest on a lump sum or monthly deposits, with simple or compound interest and tax.
• Compound Interest Calculator — future value of a balance with monthly contributions, with a year-by-year chart.
• Savings Goal Calculator — months to reach a target, or the monthly amount needed by a deadline.
• Average Down Calculator — new average cost per share after more purchases, or shares needed for a target cost.
• Dividend Calculator — dividend income after tax, yield and the investment needed for a monthly target.
• Percentage Calculator — percent of a number, percent change, and what percent one number is of another.
• Bill Split Calculator — each person's share of a check, with rounding and a payment note.
• Gas Trip Cost Calculator — fuel cost from miles, MPG and price per gallon, and each rider's share.
• Habit Cost Calculator — daily, weekly, monthly, yearly and 10-year cost of small recurring spending.

Health & Body

BMI, calories, sleep, pregnancy, baby age and pet age with US units. See all Health & Body tools.

• BMI Calculator — body mass index and weight category, with standard and Asian-American cut-offs.
• BMR Calculator — calories your body burns at rest, plus daily calorie targets.
• Calories Burned Calculator — calories burned by an activity for your weight and time.
• Sleep Calculator — bedtimes and wake-up times based on 90-minute sleep cycles.
• Pregnancy Week Calculator — how many weeks and days pregnant you are, and the trimester.
• Due Date Calculator — estimated due date from your last period, conception date or IVF transfer.
• Ovulation Calculator — estimated fertile window and ovulation day from your cycle.
• Baby Age Calculator — age in days, weeks and months, and upcoming milestone dates.
• Dog & Cat Age Calculator — your pet's age in human years, by species and size.

Date & Time

Days between dates, countdowns and time zones with daylight saving built in. See all Date & Time tools.

• Date Calculator — days between dates, a date N days or months away, and business days.
• Countdown Calculator — days left until (or since) a date, with milestones and saved cards.
• Anniversary Calculator — days together and the next 100-day, 1,000-day and yearly milestones.
• Time Zone Converter — time in another city, the day change, and daylight saving notes.

School & Work

GPA, work hours, working days and a typing speed test. See all School & Work tools.

• GPA Calculator — gPA from letter grades and credits on a 4.0 or 4.3 scale.
• Work Hours Calculator — hours worked per day and per week, overnight hours and estimated pay.
• Working Days Calculator — workdays between dates, minus time off and holidays, and prorated pay.
• Typing Speed Test — words per minute, characters per minute and accuracy from one sentence.

Text & Tools

Word counter, password generator, unit converter and other everyday utilities. See all Text & Tools tools.

• Word Counter — words, characters, sentences, paragraphs and reading time.
• Text Cleaner — removes extra spaces, line breaks and unwanted formatting.
• Special Characters — copy-and-paste symbols, arrows, math signs and punctuation.
• Password Generator — random passwords with a strength meter in bits of entropy.
• Username Generator — handle ideas in several styles, ready to copy.
• Color Converter — hEX, RGB and HSL values with a live preview.
• Unit Converter — length, weight, temperature, volume and more between US and metric units.

Fun & Games

Tarot, personality type compatibility, random teams, a ladder game, a reaction time test and biorhythm. See all Fun & Games tools.

• Random Team Generator — evenly sized random teams from a list of names, by team count or team size.
• Ladder Game (Amidakuji) — matches 2 to 10 players to outcomes with an animated ladder.
• Tarot Card Reading — card of the day, 3-card and 5-card spreads with upright and reversed meanings.
• Personality Type Compatibility — compatibility score, radar chart and reports for any two of the 16 types.
• Reaction Time Test — click when the screen turns green; average and best time in milliseconds.
• Biorhythm Calculator — physical, emotional and intellectual cycles from a birth date, with a chart.

Display & Screen

Work out how sharp a screen is, how far away to sit, and what a refresh rate means in milliseconds. See all Display & Screen tools.

• PPI Calculator — pixel density and pixel pitch from resolution and diagonal size.
• Screen Size Converter — turn a diagonal measurement into actual width and height.
• Viewing Distance Calculator — how far to sit from a TV or monitor for a sharp image.
• Refresh Rate Converter — convert Hz to frame time in milliseconds.

Korea & Culture

Korean age, the Korean zodiac, saju compatibility, your name in Hangul and Korean apartment sizes, explained for English readers. See all Korea & Culture tools.

• Korean Age Calculator — find your Korean age and international age side by side.
• Korean Zodiac Calculator — your animal sign and element from your birth year.
• Saju Compatibility — a traditional Korean compatibility reading for two people.
• Your Name in Korean — see an English name written in Hangul, with alternative spellings.
• Pyeong to Sq Ft Converter — convert Korean apartment sizes between pyeong, square meters and square feet.

How this works

Every tool on this site is designed to be lightweight and easy to use in your browser. Calculators run locally, so the numbers and text you enter stay on your device, and discovery experiences are built to minimize friction and avoid unnecessary sign-up.

Toolssok started as a Korean-language collection of everyday tools and is now growing for readers worldwide, with US units, US dollars and dates written the American way. The Korean site includes pay, tax, dates, health and more for readers in Korea.