Life Calculator

General Calculator

Discount Rate Calculator

Discount rate is the percentage applied when a product or service is sold below the list p...

Tip Calculator

Enter the bill amount, tip percentage, and number of people to get the tip and the amount ...

Days Until Date (Countdown) Calculator

Count down the days or hours remaining until a specific date such as an exam, election, bi...

Time Unit Converter Calculator

Convert between seconds, minutes, hours, and days — e.g. how many minutes are in 1300 seco...

Unix Timestamp Calculator

Unix time is the number of seconds elapsed since January 1, 1970 00:00 UTC, represented as...

Age Calculator

Enter your birth date to calculate your international age and Korean age based on today's ...

Date Calculator (Add/Subtract)

Add or subtract days from a base date to find the resulting date.

BMI Calculator

Enter your weight and height to get your BMI and an underweight/normal/overweight/obese cl...

Daily Water Intake Calculator

Enter your weight to calculate your recommended daily water intake in milliliters.

Lotto Number Generator Calculator

Draw six unique numbers from 1 to 45 at random. Generate up to 20 games at once, each show...

US Lottery Tax Calculator

Estimate 24% federal withholding plus state tax on US lottery winnings and see the net pri...

About This Category

The life calculators deal with small decisions that repeat: how much to tip, what a discount really saves, how much water to drink, when a deadline lands. They are quick to use, yet this is where most everyday arithmetic mistakes happen.

The time and date tools are the ones people come back to. Adding a month to 31 January, converting between time zones or reading a Unix timestamp all depend on conventions, and each page states the one it uses.

Frequently Asked Questions

Is the BMI result a health diagnosis?

No. It is a screening figure derived from population data, blind to muscle mass, fat distribution and ethnicity. A high or low value is a prompt to look further, not a conclusion.

Why is lottery prize tax not a single rate?

Because the rules are progressive or exempt up to a threshold depending on the country, and each jurisdiction sets its own bands. The calculator applies the bands of the country for the selected language and shows tax and net prize separately.

Do the time tools include today?

The countdown and date tools state whether the start day counts. Legal deadlines normally exclude the first day and include the last, which is why the convention is written on the page instead of assumed.

Calculators in This Category

Sources & last update

2026-10-19