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keisanHigh-precision calculations for everyday life and work

Popular Calculators Ranking

TOP/Popular Calculators Ranking

* Only calculations run on the new display (beta) are counted. Runs on the classic display are not included.

RankCalculatorUsage Count
1Calculating 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
2BMI 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
3Generating Uniformly Distributed Integer Random Numbers

Generates random integers from the specified range.

4,598
4Time calculation (End time – Start time)

Calculates the elapsed time from the start time to the end time.

3,756
5Date 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
6Calculating 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
7Time Calculation (Time + Elapsed Time)

Calculates a time that is a certain amount of time after (or before) a specified time.

1,616
8Consumption 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
9Withholding 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
10Childhood Obesity

We check for childhood obesity based on height and weight.

1,287
11Accumulation 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
12How 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
13Calculating 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
14Loan 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
15Proseca Skill Multiplier Calculator

Skill Multiplier Calculator

798
16Remainder Calculation

We will calculate the quotient and remainder of a division problem.

729
17Proseca 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
18Calculation 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
19Body 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
20Nine 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
21Compound 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
22Accumulation 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
23Calculating a Baseball Batting Average

Calculate a baseball batting average.

578
24A Child's Genetic Height (O-Method)

We calculate your child's genetic growth target (Target Height) based on your parents' heights.

571
25Calculating TDEE

Calculate your Total Daily Energy Expenditure (TDEE).

565
26Calculation 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
27Calculating ERA in Baseball

Calculate the ERA in baseball.

421
28Calculating biorhythms

This graph displays your biorhythms (physical, emotional, and intellectual) for approximately one month starting from the reference date.

409
29Prime factorization

Factors the specified integer into its prime factors.

402
30Lunar Calendar

Calculates the lunar calendar based on the current month and year.

384
31Depreciation (FY2012–)

This calculates the depreciation expense applicable to depreciable assets acquired on or after April 1, 2012.

367
32Right Triangle

Calculates the values of the other elements based on the two selected input values for a right triangle.

356
33Win Rate Calculation

Test

356
34When was "X days ago"?

Calculates the number of days before the selected date. Example: What is the date X days before today?

353
35Calculating a Baseball Winning Percentage

Calculate the winning percentage in baseball.

349
36Which 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
37How many days until...?

This calculates the number of days remaining from today until the selected date.

344
38Calculating OPS in Baseball

Calculate the OPS (on-base plus slugging) in baseball.

334
39Calculation of Fixed Overtime Pay

Calculate the fixed overtime pay when "Total compensation = Wages for scheduled working hours + Fixed overtime pay"

311
40Discomfort Index

We calculate the heat index based on temperature and humidity.

306
41Converting UNIX time to a date

Converts UNIX time to a date.

298
42Calculate 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
43Basal 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
45Calculating the Duration of Maternity and Parental Leave

Calculate the duration of maternity and parental leave.

269
46Early 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
47Calculation 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
48In-situ calculation (for bar stock)

Stock calculation. This is the bar stock reference number.

239
49Calculation of Cash on Hand

Calculate the cash on hand when closing the register.

237
50Calculating Calories Burned While Walking

Calculate the calories burned while walking.

225
51Microwave Wattage and Heating Time

Modified Version of "soo_ Microwave Cooking Time Conversion (Approximate)"

221
52Withholding 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
53Calendar 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
54Calculation 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
55Tax-inclusive calculation

Calculate the tax included in the price.

191
56The 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
57Chinese Zodiac Calendar

Calculates the Chinese zodiac calendar (day, month, and year) based on the current month and year.

175
58Taxes on Severance Pay

We will calculate the income tax and local taxes on your severance pay.

171
59Part-time equivalent

Convert the amount of data.

165
60Withholding 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
61Date 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
62Calculating the Refund Amount for Commuter Passes

This calculates the refund amount for the specified train pass.

162
63Predicted Final Height

We predict your child’s final height based on their environment and your height.

160
64Adding and Subtracting Hours and Minutes

Perform addition and subtraction of fractions.

145
65Calculation 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
66Calculate 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
67Date to UNIX Time Conversion

Converts a date to UNIX time.

135
68Estimated 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
69Calculate 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
70Calculating the Drip Rate for an IV

Calculate the drip rate for the IV.

126
71Plotting a Line Chart

Plot branch sales using a line graph.

126
72Date 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
73Calendar 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
74Calculating Overtime Pay

We calculate overtime pay for work performed outside regular hours, on holidays, and at night.

123
75Calculation 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
76Calculate 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
77Calculating Calories Burned While Running

Calculate the calories burned while running.

117
78Healthy Weight / Ideal Weight

We calculate your ideal weight and beauty weight based on your height.

112
79Loan 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
80Area 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
81Nine Star Calendar

Calculates the Nine Star Calendar (Daily, Monthly, and Annual Nine Stars) based on the current month and year.

99
82FFMI calculation

We calculate the FFMI (Fat-Free Mass Index), also known as the "muscle mass index."

97
83power

We will calculate the power.

96
84Withholding Tax on Bonuses: Reiwa 8 and Later

We will calculate the withholding tax amount for bonuses for the Reiwa 8 fiscal year.

96
855th Grade: Simplifying Fractions

We will simplify fractions. We will also display the greatest common divisor. (Mixed fractions are allowed.)

94
86Calculating Calories Burned While Cycling

Calculate the calories burned while cycling.

94
87Lean body mass

Calculation of Lean Body Mass

94
88Area 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
89Puzzle & Dragons: LS Effective HP Multiplier Calculator

Puzzle & Dragons: Calculator for Effective HP Based on Leader Skill HP Multipliers and Damage Reduction Rates

93
90Calculate the percentage

We calculate the ratio based on the base quantity and the comparison quantity.

92
91Long-distance running (lap)

Based on the distance and target time, I will create a pace chart.

91
92Binomial distribution

Find the probability density function, the lower cumulative distribution function, and the upper cumulative distribution function of the binomial distribution.

89
93Conversion of Force

Converts the specified unit of force to other units (Newton N ⇔<br>kilogram-force kgf, etc.).

87
94Calculating Children's Gifts

Please list the dates of the major celebrations since the child was born.

87
95Average 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
96Basic 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
97Calculating 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
98Calculate 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
99Greatest 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
100Regular 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
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