Use the Market Value Calculator to find what your stock position is worth today, plus your gain or loss in dollars and percent.

Use the California Tip Calculator to add the 7.25 percent base sales tax and your tip to any restaurant bill in California.

Find the day of the week for any date with this free Weekday Calculator — enter a date and see if it falls on a weekday or weekend.

Use the When Can I Test Calculator to find your earliest pregnancy test date from your last period, plus an estimated due date.

Count the weekdays in any month with this free Workdays Calculator — pick a year and month to see workdays and total days at once.

Add business days to any start date with this free Business Day Calculator — skip weekends automatically and get the exact end date fast.

Use the Z Score Area Calculator to find the share of values between two z scores fast, with clear steps and worked examples.

Use the 5e Ability Score Calculator to turn all six scores into modifiers fast, with examples and build tips for your hero.

Use the Army Bmi Calculator to check your BMI against age-group screening limits, with tape-test facts and prep tips included.

Use the Final Class Grade Calculator to find the exact score you need on your final exam to hit the grade you want in any class.