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All tools(500)
Percentage Calculator
Three common percentage calculations — instant & private.
Age Calculator
Your exact age in years, months & days — plus a birthday countdown.
BMI Calculator
Body Mass Index with metric or imperial units & category color coding.
Scientific Calculator
A real working calculator: functions, constants, memory & percent.
Date Difference Calculator
Days, weeks, months & years between two dates — instant.
GPA Calculator
Compute your grade point average on a 4.0 scale, weighted by credits.
Statistics Calculator
Mean, median, mode, std deviation & more from a list of numbers.
BMR & TDEE Calculator
Daily calorie needs for maintenance, loss and gain — Mifflin-St Jeor.
Ratio Calculator
Solve the missing side of a ratio, or simplify it with GCD.
Ovulation Calculator
Estimate your fertile window, ovulation date, next period & due date.
Fuel Cost Calculator
Estimate fuel used and trip cost from distance, efficiency and price.
Speed Calculator
Solve speed, distance or time from the other two — km/h, m/s, mph.
