Ask a room of adults what 6 + 2 × 3 equals and you will hear both 24 and 12 — the split comes down to parentheses, or the lack of them. Parentheses are the boss of arithmetic: whatever sits inside them gets evaluated before anything outside, which is the first commandment of the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction). Wrapping (6 + 2) × 3 forces the addition first and gives 24, while 6 + (2 × 3) — or no parentheses at all — gives 12.

Spreadsheets, tax forms, and construction estimates all hinge on this. A contractor pricing (8 + 4) feet of lumber at $5 a foot owes $60, not $28; the parentheses decide which number the $5 multiplies. Nested parentheses work from the inside out, like unpacking boxes: solve the innermost pair first, then the next layer. This calculator handles the final combination step. Evaluate the innermost parenthesized chunk on paper, type it into the Variable A box, type the outside number into the Variable B box, and the Result box shows the combined answer — for example, 12 and 3 give 36 for (8 + 4) × 3.

With the pre-filled defaults — Variable A 10, Variable B 5 — the Parentheses Calculator returns Result 50.0000. Change any input and those results update instantly, so you can see exactly how each number you enter moves the answer.