Add, subtract, multiply, or divide imperial fractions. Accepts mixed numbers like 1 1/2, fractions like 3/8, or decimals.
Enter two values and pick an operation.
Input examples:
1 1/2 — mixed number (one and a half)3/8 — fraction2.75 — decimal-1/4 — negatives allowed (e.g. subtracting kerf)Shop math lives in sixteenths and thirty-seconds. Add a 3/4″ leg to a 15/16″ apron setback, halve an odd span for a centered mortise, or divide a case side into equal drawer openings without converting to decimals and back.
Save your numbers, not just crunch them
Members save cut lists and estimates to projects, feed them into the cost estimator, and track real spend against the plan.
Divide the total width as a fraction — or skip the math: lay a ruler diagonally so a convenient whole number spans the board and mark equal divisions along it.
1 13/16″. Convert to an improper fraction (29/8), halve the numerator against a doubled denominator (29/16), then simplify.