Use the percentage calculator in seconds
Choose a percentage of a number, a percent ratio, or change from an original value. Blank, malformed and out-of-range input suppresses the result instead of becoming zero. A percent ratio requires a nonzero second value. Percentage change subtracts the original value from the new value, divides by the original, then multiplies by 100; the original must be greater than zero. Negative change is labelled as a decrease, while equal values show no change. Inputs are bounded to ±1 quadrillion, and results display up to 12 significant digits. These are mathematical estimates; context-specific reporting rules may differ.