Popular Calculators Ranking
* Only calculations run on the new display (beta) are counted. Runs on the classic display are not included.
| Rank | Calculator | Usage Count |
|---|---|---|
| 1 | Calculating the number of days (date – date) Calculates the number of days, weeks, and years between two dates. You can calculate how many days have passed since birth. | 5,743 |
| 2 | BMI and Healthy Weight We calculate your BMI, which indicates your level of obesity based on your height and weight, as well as your ideal weight. | 5,356 |
| 3 | Generating Uniformly Distributed Integer Random Numbers Generates random integers from the specified range. | 4,598 |
| 4 | Time calculation (End time – Start time) Calculates the elapsed time from the start time to the end time. | 3,756 |
| 5 | Date Calculation (Date + Number of Days) Calculate a new date by adding a number of days to the current date. If you enter a negative number of days, the result will be the current date minus that number of days. Example: What is the date X days from today? | 2,312 |
| 6 | Calculating Part-Time Work Hours Calculate part-time wages—including working hours, payroll calculation hours, and daily wages—based on the start and end times of the shift. | 2,202 |
| 7 | Time Calculation (Time + Elapsed Time) Calculates a time that is a certain amount of time after (or before) a specified time. | 1,616 |
| 8 | Consumption tax We will run simulations for three scenarios—5%, 8%, and 10% consumption tax—applied to amounts excluding or including tax. (Tax-inclusive and tax-exclusive calculations) | 1,521 |
| 9 | Withholding Tax on Salary Income for Fiscal Year 2026 (Monthly Amount) Calculate the monthly withholding tax amount for salary income for the 2026 tax year. | 1,342 |
| 10 | Childhood Obesity We check for childhood obesity based on height and weight. | 1,287 |
| 11 | Accumulation Calculation (Compound Interest with Annual Taxation) This tool calculates and displays a graph of the total principal and interest, as well as the interest alone, for a fixed-amount savings plan. Taxes are applied after each compound interest calculation. | 1,249 |
| 12 | How old are you now (or were you back then)? Calculate your age today/at that time using both calendar age and traditional Japanese age. | 1,136 |
| 13 | Calculating Withholding Tax on Interest Earned on Deposits Calculate the withholding tax (income tax and special income tax for reconstruction) and the total interest amount based on the interest earned on deposits. (Effective January 1, Heisei 28 onward) | 921 |
| 14 | Loan Repayment (Monthly Payments) Using the equal principal and interest or equal principal repayment methods, calculate a table showing the repayment amount and outstanding balance for each payment based on the loan amount. | 867 |
| 15 | Proseca Skill Multiplier Calculator Skill Multiplier Calculator | 798 |
| 16 | Remainder Calculation We will calculate the quotient and remainder of a division problem. | 729 |
| 17 | Proseca Event Point Calculator Based on overall power, effective stats, and event bonuses, you can calculate the estimated points you can earn from a single round of "Ebi" in a multiplayer room, as well as the points you can earn in My World. Use this tool when you're unsure about your event team composition or when estimating your runner's speed. | 710 |
| 18 | Calculation of Employment Insurance Premiums Calculate the employment insurance premiums (employee and employer contributions) based on the total amount of wages and bonuses paid. (October 1, 2022 – March 31, 2027) | 687 |
| 19 | Body Fat Percentage (Estimated) This tool estimates your body fat percentage based on your height, weight, gender, and age. It is intended for people 18 years of age and older. Accurate results cannot be obtained for high school students and younger. Since the estimation formula is based on an average body type, it may not apply to people who do not fit this average. (e.g., those who are extremely overweight, extremely underweight, athletes, or those who have been doing proper strength training for a long time) Additionally, if your measurements deviate significantly from the average, the result may be a negative value. | 685 |
| 20 | Nine Star Ki Calculation The annual, monthly, and daily Nine Stars for the specified date will be calculated, and the corresponding Nine Star charts will be displayed. | 622 |
| 21 | Compound Interest Calculation (Principal and Interest Total) This tool calculates and displays a graph of the total principal and interest at each interest payment date, using compound interest. | 614 |
| 22 | Accumulation Calculation (Lump-Sum Taxation at Maturity) This tool calculates and displays a graph of the total principal and interest, as well as the interest alone, for a fixed-amount savings plan. Taxes are levied in a lump sum at maturity. | 583 |
| 23 | Calculating a Baseball Batting Average Calculate a baseball batting average. | 578 |
| 24 | A Child's Genetic Height (O-Method) We calculate your child's genetic growth target (Target Height) based on your parents' heights. | 571 |
| 25 | Calculating TDEE Calculate your Total Daily Energy Expenditure (TDEE). | 565 |
| 26 | Calculation of Business Days Calculates the number of business days between two dates, excluding holidays. Supports major banks, government agencies, and other organizations from 2020 onward. | 522 |
| 27 | Calculating ERA in Baseball Calculate the ERA in baseball. | 421 |
| 28 | Calculating biorhythms This graph displays your biorhythms (physical, emotional, and intellectual) for approximately one month starting from the reference date. | 409 |
| 29 | Prime factorization Factors the specified integer into its prime factors. | 402 |
| 30 | Lunar Calendar Calculates the lunar calendar based on the current month and year. | 384 |
| 31 | Depreciation (FY2012–) This calculates the depreciation expense applicable to depreciable assets acquired on or after April 1, 2012. | 367 |
| 32 | Right Triangle Calculates the values of the other elements based on the two selected input values for a right triangle. | 356 |
| 33 | Win Rate Calculation Test | 356 |
| 34 | When was "X days ago"? Calculates the number of days before the selected date. Example: What is the date X days before today? | 353 |
| 35 | Calculating a Baseball Winning Percentage Calculate the winning percentage in baseball. | 349 |
| 36 | Which of these two products with different capacities is the better deal? Let's calculate which of two products—with the same contents but different sizes and prices—offers better value per unit. | 346 |
| 37 | How many days until...? This calculates the number of days remaining from today until the selected date. | 344 |
| 38 | Calculating OPS in Baseball Calculate the OPS (on-base plus slugging) in baseball. | 334 |
| 39 | Calculation of Fixed Overtime Pay Calculate the fixed overtime pay when "Total compensation = Wages for scheduled working hours + Fixed overtime pay" | 311 |
| 40 | Discomfort Index We calculate the heat index based on temperature and humidity. | 306 |
| 41 | Converting UNIX time to a date Converts UNIX time to a date. | 298 |
| 42 | Calculate the angle and hypotenuse from the base and height Calculate the angle of inclination and the hypotenuse of a right triangle using its base and height. | 294 |
| 43 | Basal metabolic rate We will calculate your basal metabolic rate (BMR), which is the amount of energy required to sustain life. | 285 |
| 44 | [NISA] Investment Calculations That Account for Changes in Contribution Amounts
| 270 |
| 45 | Calculating the Duration of Maternity and Parental Leave Calculate the duration of maternity and parental leave. | 269 |
| 46 | Early Loan Repayment Calculate a table showing the outstanding balance and the amount of each repayment—including prepayments—for a loan using either the equal principal and interest or equal principal repayment method. | 265 |
| 47 | Calculation of Health Insurance Premiums We calculate health insurance premiums, long-term care insurance premiums, child and childcare contributions, and child and childcare support payments, as well as the employee’s share of these costs, based on salary and bonus amounts. (Fiscal Years 2022, 2023, 2024, 2025, and 2026) | 240 |
| 48 | In-situ calculation (for bar stock) Stock calculation. This is the bar stock reference number. | 239 |
| 49 | Calculation of Cash on Hand Calculate the cash on hand when closing the register. | 237 |
| 50 | Calculating Calories Burned While Walking Calculate the calories burned while walking. | 225 |
| 51 | Microwave Wattage and Heating Time Modified Version of "soo_ Microwave Cooking Time Conversion (Approximate)" | 221 |
| 52 | Withholding Tax Statement (Salary Income) for Reiwa 7 and onward— Calculates withholding tax statements for salaried employees. Applies to the Reiwa 7 tax year and beyond. | 220 |
| 53 | Calendar Note Calculation Calculates the calendar notes (lunar calendar, Rokuyō,干支, Nine Stars, Twelve Directs, Twenty-Eight Mansions, and Twenty-Seven Mansions) for the current calendar date. | 210 |
| 54 | Calculation of Business Dates This function calculates a new date by adding the number of business days to the given date. It supports major banks, government agencies, and other organizations. | 204 |
| 55 | Tax-inclusive calculation Calculate the tax included in the price. | 191 |
| 56 | The Nine Stars of Time Calculates the Nine Stars of the Year and Month (Year-Month Nine Stars) and the Nine Stars of the Hour (Hourly Nine Stars) based on the current date and time. | 189 |
| 57 | Chinese Zodiac Calendar Calculates the Chinese zodiac calendar (day, month, and year) based on the current month and year. | 175 |
| 58 | Taxes on Severance Pay We will calculate the income tax and local taxes on your severance pay. | 171 |
| 59 | Part-time equivalent Convert the amount of data. | 165 |
| 60 | Withholding Tax on Salary Income for Fiscal Years 2020–2025 (Monthly Amounts) Calculate the monthly withholding tax amounts for salary income for the years 2020, 2021, 2022, 2023, 2024, and 2025. | 163 |
| 61 | Date and Time Calculation (End Date and Time – Start Date and Time) Calculates the number of days and hours elapsed between the start date and time and the end date and time. | 163 |
| 62 | Calculating the Refund Amount for Commuter Passes This calculates the refund amount for the specified train pass. | 162 |
| 63 | Predicted Final Height We predict your child’s final height based on their environment and your height. | 160 |
| 64 | Adding and Subtracting Hours and Minutes Perform addition and subtraction of fractions. | 145 |
| 65 | Calculation of Employees' Pension Insurance Premiums Calculate the Employees' Pension Insurance premiums and the employee's share of those premiums based on the amount of salary and bonuses. | 138 |
| 66 | Calculate sodium (mg) from salt equivalent (g) Calculate the sodium content based on the salt equivalent listed in the nutritional information on the ingredient label. | 135 |
| 67 | Date to UNIX Time Conversion Converts a date to UNIX time. | 135 |
| 68 | Estimated Income Eligibility for Public Assistance This tool estimates the amount of income from employment that is eligible for welfare benefits. *Please note that exact amounts may vary by municipality and fiscal year, so these figures are approximate. | 130 |
| 69 | Calculate the amount of withholding tax on manuscript fees, speaking fees, and other similar payments Calculate the withholding tax when paying royalties, speaking fees, and other similar payments. | 127 |
| 70 | Calculating the Drip Rate for an IV Calculate the drip rate for the IV. | 126 |
| 71 | Plotting a Line Chart Plot branch sales using a line graph. | 126 |
| 72 | Date and Time Calculation (Start Date and Time + Elapsed Time) Calculates the date and time that is a certain number of days and hours after (or before) the start date and time. | 123 |
| 73 | Calendar Notes Calculates the lunar calendar and astrological notes (Chinese zodiac, Nine Stars, Twelve Directs, and Twenty-eight/Twenty-seven Lunar Mansions) based on the current month and year. | 123 |
| 74 | Calculating Overtime Pay We calculate overtime pay for work performed outside regular hours, on holidays, and at night. | 123 |
| 75 | Calculation of Employment Insurance Benefits (Unemployment Benefits) This tool calculates the amount of employment insurance benefits (unemployment benefits) and the number of benefit days. (Effective August 1, Reiwa 8: Change to the daily basic benefit amount under the Employment Insurance Act) | 118 |
| 76 | Calculate withholding tax on dividends Calculate the total dividends and withholding tax (income tax and Special Income Tax for Reconstruction) based on the dividend payment amount. (January 1, 2014 – December 31, 2007) | 117 |
| 77 | Calculating Calories Burned While Running Calculate the calories burned while running. | 117 |
| 78 | Healthy Weight / Ideal Weight We calculate your ideal weight and beauty weight based on your height. | 112 |
| 79 | Loan Repayment (Including Bonus Payments) Calculate a table showing the monthly and bonus-time repayment amounts and the outstanding balance for a loan using the equal principal and interest or equal principal repayment methods. | 109 |
| 80 | Area of a Triangle (Using Heron's Formula from the Three Sides) We will calculate the area of a triangle using Heron's formula based on its three sides. | 106 |
| 81 | Nine Star Calendar Calculates the Nine Star Calendar (Daily, Monthly, and Annual Nine Stars) based on the current month and year. | 99 |
| 82 | FFMI calculation We calculate the FFMI (Fat-Free Mass Index), also known as the "muscle mass index." | 97 |
| 83 | power We will calculate the power. | 96 |
| 84 | Withholding Tax on Bonuses: Reiwa 8 and Later We will calculate the withholding tax amount for bonuses for the Reiwa 8 fiscal year. | 96 |
| 85 | 5th Grade: Simplifying Fractions We will simplify fractions. We will also display the greatest common divisor. (Mixed fractions are allowed.) | 94 |
| 86 | Calculating Calories Burned While Cycling Calculate the calories burned while cycling. | 94 |
| 87 | Lean body mass Calculation of Lean Body Mass | 94 |
| 88 | Area Conversion Converts the specified area unit to another unit system.<br>(square meters m<sup>²</sup> ⇔ square millimeters mm<sup>²</sup>, square meters m² ⇔ hectares ha, etc.) | 94 |
| 89 | Puzzle & Dragons: LS Effective HP Multiplier Calculator Puzzle & Dragons: Calculator for Effective HP Based on Leader Skill HP Multipliers and Damage Reduction Rates | 93 |
| 90 | Calculate the percentage We calculate the ratio based on the base quantity and the comparison quantity. | 92 |
| 91 | Long-distance running (lap) Based on the distance and target time, I will create a pace chart. | 91 |
| 92 | Binomial distribution Find the probability density function, the lower cumulative distribution function, and the upper cumulative distribution function of the binomial distribution. | 89 |
| 93 | Conversion of Force Converts the specified unit of force to other units (Newton N ⇔<br>kilogram-force kgf, etc.). | 87 |
| 94 | Calculating Children's Gifts Please list the dates of the major celebrations since the child was born. | 87 |
| 95 | Average Height and Weight for Children Compare your child's height and weight to the national average. You can check data for ages 1 to 18. | 86 |
| 96 | Basic Allowance for Continued Employment of Older Workers We will calculate the Basic Allowance for Continued Employment of Older Workers, which is paid to individuals under the age of 65 who continue working after retirement if their wages fall below 75% of their wages at age 60. | 84 |
| 97 | Calculating Withholding Tax Based on Take-Home Pay Calculate the total payment amount and the withholding tax by working backward from the net amount after withholding. | 84 |
| 98 | Calculate the hypotenuse and height from the angle and base Calculate the hypotenuse and height of a right triangle using its base and the angle of inclination. | 83 |
| 99 | Greatest Common Divisor and Least Common Multiple Find the greatest common divisor (G.C.D.) and the least common multiple (L.C.M.) of two or more numbers. | 81 |
| 100 | Regular Savings Plan with Bonus Contributions (Lump-Sum Taxation at Maturity) This tool calculates and displays a graph of the total principal and interest, as well as the interest alone, for a fixed-amount savings plan that includes bonuses. Taxes are levied in a lump sum at maturity. | 74 |