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Solve the classic cranes-and-turtles word problem: find how many of each from the total heads and total legs, with a step-by-step solution and a check.

Find how many days it takes p workers to finish a job that P workers do in D days. Shows the total work and a step-by-step solution.

Find the concentration when two salt solutions are mixed. A classic word problem solver that works from total salt and total weight, with steps.

Find when two people moving toward each other from a given distance apart will meet, plus each person's travel distance and the meeting point.

Find the time to catch up and the distance to the meeting point from the leader speed, chaser speed, and head start distance or time gap.

Find the angle between the hour and minute hands at any time, or the time when the hands overlap, form a straight line, or make a right angle.

Calculate the probability of rolling a given total with several dice. Shows the exact probability of a target sum, the at-least and at-most probabilities, expected value, variance, and a bar chart of the distribution.

Calculate the probability that two people in a group of n share a birthday. Explore the surprising birthday paradox with a probability curve.

Three basic percentage calculations in one: what percent A is of B, a given percent of a number, and the whole from a part and its percentage. Enter two numbers to instantly get the percent or amount, with your choice of decimal places and rounding.

Enter a starting (old) value and an ending (new) value to instantly get the percent change, the year-over-year ratio, and the absolute difference. Great for sales, prices, population, and traffic growth.