Percentage Calculator

What each input means

• Mode — Choose Find value (X% of Y) or Find percent (X is what % of Y); the first two fields relabel automatically.
• Find value — Enter percentage (%) and base value; result = base × (percentage ÷ 100).
• Find percent — Enter part value and total value; result = (part ÷ total) × 100 as a percent. If total is 0, the tool shows an error instead of dividing.

Formula used

Both modes use standard percent arithmetic; non-numeric inputs are rejected.