# All Calculators

Browse our growing collection of calculators that you may find useful for solving particular problems:

## Coin Flip Probability

Calculate the probability of obtaining a fixed number of heads or tails from a fixed number of tosses. Also calculate the probability of getting at least or at most a certain amount of heads or tails from a set number of tosses.

## Decimal to Percentage

Calculate the equivalent percentage from its associated decimal value.

## Hourly to Salary

Calculate what your hourly pay equates to in terms of an annual salary. Quickly calculate a breakdown of your hourly, daily, weekly, biweekly, monthly, quarterly, yearly, pay or salary and time worked.

## Mulch

Calculate how much mulch you need before you make your trip out to the store to buy some. Quickly calculate a breakdown of the various quantities of mulch from dimensions or from an area.

## Percentage

This percentage calculator is useful for determining the percentage increase or decrease between two numbers, and numbers as they relate to a percentage and vice versa. Common uses for this calculator include calculating taxes, statistics, investment returns or losses, and tips on a restaurant bill.

## Percentage Change

The percentage change calculator is used to calculate the exact percentage increase or percentage decrease from one initial value or number to another final value.

## Percentage Error

Calculate the relative percentage error between a true value and the observed value found in a measurement.

## Percentage to Decimal

Calculate the equivalent decimal from its associated percentage value.

## Salary to Hourly

Calculate what your annual salary represents in terms of an hourly pay rate. Quickly calculate a breakdown of your hourly, daily, weekly, biweekly, monthly, quarterly, yearly, pay or salary and time worked.

## Sleeping Time

Quickly determine how many hours you slept last night. Get to terms with how good or bad your sleep was last night.