Quick Calc

Health

• Pure Alcohol Intake Calculator — Calculate the pure alcohol (g) and standard drinks in what you drink from the volume and ABV, free.
• BMI & Ideal Weight Calculator — Enter your height and weight to get your BMI and ideal weight (BMI 22) for free, judged by the Japanese Society for the Study of Obesity standard used in Japanese health checkups.
• Basal Metabolic Rate (BMR) Calculator — Enter your age, sex and weight to calculate your daily basal metabolic rate (kcal) for free, using the reference values from Japan's Ministry of Health, Labour and Welfare Dietary Reference Intakes.
• Caffeine Intake Calculator — Add up the caffeine in coffee, black tea, green tea, energy drinks and more, and compare it with the daily guide (400 mg for healthy adults, less during pregnancy).
• Sleep Cycle Calculator — Work backwards from the time you want to wake up and get the bedtimes that land on the boundary of the roughly 90-minute sleep cycle.
• Steps → Distance & Calorie Converter — Convert your step count and height into walking distance (km), time and estimated calories burned.
• Due Date & Pregnancy Week Calculator — Calculate your due date and current pregnancy week (X weeks Y days) from the first day of your last period, free.
• Running Pace Calculator — Get your pace per kilometre and your speed from a distance and a target time, free.
• Daily Protein Intake Calculator — Calculate a daily protein guide from your weight and activity level, with food equivalents — how much chicken breast, eggs, milk or natto it corresponds to.
• Target Heart Rate Calculator (Karvonen Formula) — Calculate the target heart-rate zone for fat burning and endurance with the Karvonen formula, from your age and resting heart rate.
• Salt Content Calculator (Sodium ⇔ Salt Equivalent) — Convert the sodium (mg) on a food label into salt equivalent (g) in one step, free.
• Sleep Duration Calculator — Just enter your bedtime and wake-up time to calculate your sleep duration for free — it works even across midnight.
• Exercise Calorie Burn Calculator — Calculate the calories burned by 13 activities — jogging, cycling, swimming, tennis, strength training, jump rope, yoga and more — with the METs method (official METs table).
• Daily Calorie Intake Calculator — Calculate for free how many calories you should eat per day (estimated energy requirement) from your age, sex, weight and activity level, based on the reference values and physical activity levels of Japan's Ministry of Health, Labour and Welfare.
• Walking Calorie Burn Calculator — Calculate the calories you burn walking from your weight, time and pace, using the METs formula from Japan's Ministry of Health guidelines.

Money

• Compound Interest & Monthly Savings Simulator — See how much your monthly savings will be worth in the future from the amount you put aside and an assumed annual return, for free.
• Electricity Cost Calculator — Enter an appliance’s power in watts and the hours you use it to calculate what it costs per day, per month and per year in Japanese yen, for free.
• Japan Rental Property Investment Simulator — See in which year selling a Japanese rental property finally turns your total profit positive, from just five inputs.
• Gas Cost Calculator — Calculate the fuel cost and the litres of petrol a trip will take, for free, from the distance, your car’s fuel economy and the price per litre.
• Profit Margin & Cost Ratio Calculator — Enter a selling price and a cost to get the gross profit, profit margin and cost ratio instantly.
• Prorated Rent (Hiwari) Calculator — Moving into or out of a Japanese rental mid-month?
• Hourly Wage to Monthly & Annual Pay Calculator — Turn a Japanese hourly wage into gross monthly and annual pay from your hours and working days, for free.
• Home Loan Borrowing Capacity Calculator — Estimate how much you could borrow for a home loan in Japan from your annual income, repayment-to-income ratio, interest rate and term.
• Loan Repayment Calculator (Equal Monthly Payment) — Get your monthly payment, total repayment and total interest for free from the loan amount, interest rate and term, using the equal-payment (元利均等) method standard in Japan.
• Fuel Economy Calculator (Tank-Full Method) — Work out your real fuel economy in km/L from the distance driven and the litres you put in (tank-full method).
• Discount or Point Rewards — Which Is the Better Deal? — Is 10% off really the same as 10% back in points?
• Unit Price Comparison Calculator (which is cheaper?) — Enter the price and the amount for each product and compare the unit price per 100 g/ml or per item side by side.
• Japanese Consumption Tax Calculator — Add or remove Japan's consumption tax in one step, free.
• Commuter Pass Break-Even Calculator — Enter the price of a Japanese commuter pass (teiki) and your one-way fare to see how many days a month you have to travel before the pass pays for itself.
• Tip Calculator for Travel Abroad — Work out the tip, the total and the amount per person in one go, from the bill and a tip rate of 15%, 18% or 20%.
• Discount Calculator (How much is X% off?) — Find out instantly how much you pay after a 30% discount, and how much you save.
• Bill Splitting Calculator (Warikan) — Enter the total bill and the number of people to get what each person pays, free.
• Paid Leave Entitlement Calculator (Japan) — See how many days of annual paid leave you are entitled to in Japan, free, from your length of service and how many days a week you work.
• Overtime Pay Calculator (Japan) — Calculate your overtime pay in Japan for free from your base hourly wage and overtime hours.

Dates

• Age Calculator (Age, Chinese Zodiac, Hayaumare) — Enter your birth date to get your age today or on any reference date, your Chinese zodiac animal, and whether you are “hayaumare” (early-born) under Japan’s school-year system.
• Days Between Dates Calculator — Count the days between two dates and get the date and weekday N days after (or before) a base date, free.
• Japan Business Days Calculator — Find out when “3 business days later” falls, skipping weekends and Japanese national holidays (substitute holidays included).
• Japanese School Grade Calculator — Enter a date of birth and see which grade a child is in at a Japanese school right now, from elementary Grade 1 to high school Grade 3.
• Time Calculator (Totals & Time Difference) — Add up times like 1:30 + 0:45 + 8:00 and get the elapsed time between a start and end time.
• Anniversary Day Counter — Enter a birthday or anniversary to see what day number today is and the dates of milestones such as day 100, day 1,000 and day 10,000 — free.
• School Entry & Graduation Year Calculator — Enter your date of birth to get the years you entered and graduated from elementary school through university under the Japanese school system, ready for the education section of a Japanese résumé (rirekisho).
• Japanese Public Holiday Calendar — See every Japanese public holiday in 2026 and 2027, and how many days are left until the next one.
• Add Months & Month Difference Calculator — Find the date N months after (or before) any date and the full-month difference between two dates, with automatic end-of-month adjustment — free.
• Japanese Era (Wareki) Converter — Convert Western years to Japanese era years (Meiji, Taisho, Showa, Heisei, Reiwa) and back, instantly and free.

Everyday

• Data Size Converter (KB, MB, GB, TB) — Convert a data size between KB, MB, GB and TB at once, for free.
• Mean & Median Calculator — Paste a list of numbers to get the mean, median, max, min and sum in one go, for free.
• Hensachi (Deviation Score) Calculator — Free calculator for hensachi, Japan's standardized exam score (mean 50, standard deviation 10).
• Inch to cm & Pound to kg Converter — Convert inches to centimeters and pounds to kilograms (and back) instantly, for free.
• Japanese Address in English — Turn a Japanese address into English (romaji, Western order) just by typing the postal code, free and instant.
• Rice Gō ⇔ Gram Converter — Using the guides 1 gō of rice ≈ 150 g and about 200 ml of water per gō, get the rice weight, water amount, cooked yield and number of bowls from the gō count in one go.
• Mile to km Converter — Convert miles and kilometers both ways using the exact defined values, and nautical miles as well.
• Character Counter — Paste any text to count its characters instantly, with and without spaces.
• Temperature Converter — Convert Celsius (°C), Fahrenheit (°F) and Kelvin (K) in one step.
• Password Generator — Generate a strong random password on your own device, choosing the length and the character types (lowercase, uppercase, digits, symbols).
• Percentage Calculator — Free percentage calculator: what percent A is of B, X% of a value, and the percent increase or decrease from A to B — all in one place.
• Dog & Cat Age Calculator (Human Years) — Convert the age of a cat or small-to-medium dog into human years for free: 1 year = about 15 human years, 2 years = about 24, then about +4 per year.
• Microwave Wattage Time Converter — Convert a microwave heating time from one wattage to another, free and instantly.
• Roman Numeral Converter — Convert between ordinary numbers and Roman numerals (I, V, X, L, C, D, M) in both directions, free and instantly.
• Star Sign & Birthstone Finder — Enter your birthday to instantly see your zodiac (star) sign and birthstone, free.
• Height in Feet & Inches Converter — Convert height between centimeters and feet-and-inches notation (like 5'7″) in both directions.
• Speed, Time and Distance Calculator — Enter any two of speed (km/h), distance (km) and time, and the third is calculated for you, free and instantly.
• Japanese Tablespoon, Teaspoon & Cup Converter — Convert between Japanese kitchen measures — 1 tablespoon = 15 ml, 1 teaspoon = 5 ml, 1 cup = 200 ml.
• Tsubo, Square Meter and Tatami (Jo) Converter — Convert tsubo (坪), square meters (㎡) and tatami mats (畳) — the three area units used in Japanese property listings — in one step, free.
• Full-width ⇔ Half-width Converter — Convert full-width letters, digits, symbols and spaces to half-width in one go, and back again.