Woodworkers (and others) often need to calculate in fractions such as 1/4 or 5/8, not decimal: 0.25, 0.625. This is a simple calculator that includes a fraction input key to enter and perform arithmetic as fractions, rather than decimal. It also features some basic decimal functions (simply enter a decimal point with a number and it switches to decimal mode). To enter a fraction, enter your number as two or three parts separated by the fraction key (a b/c).