An experiment-driven lecture for developing CVP intuition. Adjust price, variable costs, and fixed costs to see exactly how the break-even point shifts.

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Magazine: Finance & Investment Interactive Lab — Mapping Expected Return and Cost of Capital

Enter your own inputs for CAPM and WACC to feel how expected returns and cost of capital are determined. Build the core intuition behind investment decision-making.

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Magazine: Investment Decision Interactive Lab — Making Decisions with NPV

Enter cash flows and discount rates directly to feel how NPV transforms investment judgment.

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Magazine: Macroeconomics Interactive Lab — When Policy Moves, the Graph Shifts

An experiment-driven lecture connecting IS-LM, AD-AS, and the Phillips Curve in one place. Move the policy levers and develop an intuitive feel for equilibrium in motion.

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Korea Legal Interest Calculator: Civil, Commercial & Litigation Rate

Enter principal, period, and interest type (Civil 5% / Commercial 6% / Litigation special rate 12%) to instantly calculate statutory interest and total principal-plus-interest. Useful for loans, damages, and unpaid wages.

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Health

27 tools

BMI Calculator

Body mass index and weight category

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Ideal Weight Calculator

Healthy weight range

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Macro Calculator

Protein, carbs & fat grams

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1RM Calculator

One-rep max & %

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Heart Rate Calculator

Max HR & training zones

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Body Fat Calculator

Estimate and classify body fat %

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Nutrition Calculator

Daily calories, protein, carbs, fat & water

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Water Intake Calculator

Recommended water by weight/activity

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Sleep Calculator

Optimal wake time by sleep cycle

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Caffeine Calculator

Caffeine half-life and safe intake

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Age Calculator

International and Korean age calculator

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Date Calculator

Days between & add/subtract

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Pregnancy Calculator

Gestational age and due date

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Height Predictor

Child height prediction by parent height

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Pet Age Calculator

Convert pet age to human years

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Fasting Timer

16:8, 5:2 and other fasting timers

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GPA Calculator

GPA average and graduation requirements

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Final Grade Calculator

Score needed on your final

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Menstrual Cycle Calculator

Next period, ovulation, fertile window & 3-cycle forecast

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Anniversary & D-Day

Days elapsed (D+N) and countdown to any date

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Baby Name Generator

Korean baby name suggestions by gender, style & meaning with 5-element analysis

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Vaccination Schedule

Enter birth date to get full vaccination timeline for up to age 12 (Korean schedule)

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Baby Food Scheduler

Baby food guide by month (4–24m): stage, frequency, ingredients & allergen warnings

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Café Latte Calorie Calculator

Calculate the calorie content of your café latte based on milk type, syrups, and espresso…

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Child Height Calculator

Enter father height, mother height, and child gender to estimate average adult height and…

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Life Expectancy Calculator

Estimate your life expectancy based on gender, smoking, drinking, exercise, BMI, and…

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The Biological Sports Car: Navigating Your Autonomic Nervous System

Understanding the delicate dance between your 'Gas Pedal' and 'Brake'—the Sympathetic and Parasympathetic systems—to build true resilience through modern neuroscience.

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Image Tools

11 tools

Image Cropper

Crop and save images in-browser

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Image Pixelator

Convert images to pixel art

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Image Studio

Optimize, convert and grayscale images

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Palette Extractor

Extract dominant color palettes

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Color pairs

Feel two colors together, like Grey+White

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ASCII Art Generator

Convert images to ASCII character art

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Dog Vision Simulator

See the world through a dog's eyes

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Image Metadata Viewer

View EXIF data and image properties

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SVG Studio

Edit and optimize SVG images

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Favicon Generator

Create 16, 32, 48, 180, 192, and 512px PNG favicon files from one image in your browser.

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Grayscale Image Converter

Convert color images to grayscale.

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Utilities

29 tools

Word Counter

Real-time character, word, paragraph count

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Password Generator

Generate strong random passwords instantly

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UUID Generator

Generate UUID v4 random identifiers

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Hash Generator

Generate MD5, SHA-1, SHA-256 hashes

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Lorem Ipsum Generator

Generate dummy placeholder text

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Base64 Converter

Encode/decode text and files to Base64

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Morse Code Converter

Instantly encode/decode text to Morse and back

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World Clock

Live time in 15 cities: Seoul, NYC, London, Tokyo…

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D-Day Counter

Countdown to your important dates and manage D-Days

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Stopwatch & Timer

Stopwatch, countdown timer and lap recorder

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Pomodoro Timer

25-min focus and 5-min break productivity timer

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Metronome

Precision metronome with BPM, tap tempo & time signatures

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Male to Female Height Converter

Male/female equivalent + cm, ft/in

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Emoji Picker

Search emojis by category and copy to clipboard

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Color Converter

Convert between HEX, RGB, HSL, HSV and CMYK

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Fuel Efficiency Calculator

Convert between km/L, L/100km and MPG instantly

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Fuel Cost Calculator

Calculate total fuel cost & per-person split with popular route presets

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TOEIC Score Converter

Convert TOEIC score to CEFR, IELTS & TOEFL iBT with job utility rating

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Vocab Flashcard

320 flashcards across TOEIC, business, daily & CSAT vocab sets with know/unknown tracking

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Travel Budget Calculator

Estimate travel expenses by destination, hotel class & flight for 10 popular destinations

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Random Food Picker

Can't decide what to eat? Random pick from 300+ dishes

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Aspect Ratio Calculator

Calculate aspect ratios from width × height pixels, or find a missing dimension from a…

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Calculator

A simple web calculator for addition, subtraction, multiplication, division, percent,…

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Interview Question Generator

Generate mock interview questions by job role (IT, Marketing, Sales, HR, Finance, etc.

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Legal Docs Generator

Generate starter drafts for a privacy policy, terms of service, and about page from…

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Love Calculator

Calculate your love compatibility by name or MBTI type.

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Quartile Calculator

Paste a list of numbers to instantly get the first quartile (Q1), median, third quartile…

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Random Data Generator

Generate random names, emails, numbers, UUIDs, dates, IP addresses, and strings for testing.

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Ratio Calculator

Simplify a two-number ratio into its smallest a:b form and solve x in the proportion a:b…

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Learning & Knowledge

4 tools

Game Theory in Human Relationships: Finding Win-Win in Conflict

We engage in a kind of 'secret game' interacting with others every moment. From the 'Prisoner's Dilemma' to the 'Tit-for-Tat' strategy, we learn the wisdom of game theory that clearly unpicks the c...

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Magazine: Game Theory Interactive Lab — The Delicate Balance Between Betrayal and Cooperation

Play the Prisoner's Dilemma directly to feel the cumulative effect of strategy. Build game theory intuition with your own hands.

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Magazine: Logic Interactive Lab — The Moment Truth and Falsehood Diverge

Manipulate propositional logic directly to internalize how truth tables work. You'll find that logical operations are more intuitive than you thought.

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What Career Fits You? — A Guide to the RIASEC Career Interest Test

Realistic, Investigative, Artistic, Social, Enterprising, Conventional. Dr. Holland's six-type framework helps you identify the work environments where you'll thrive. A guide to understanding your RIASEC profile and using it to design a more fulfilling career path.

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Lifestyle

0 tools