How to Calculate a Percentage: Formulas and Tips

Percentage calculation is the basis of many financial decisions. Whether for sales or your taxes, clarity is essential.

The Fundamental Formula

To find the value $V$ representing a percentage $P$ on a total $T$, we use:

$V = T \times \frac{P}{100}$

Calculating an Evolution (Increase or Decrease)

To calculate the new price after a variation of $P\%$, the formula is:

$Price_{final} = Price_{initial} \times (1 \pm \frac{P}{100})$

• Use $+$ for an increase (e.g., taxes).
• Use $-$ for a reduction (e.g., sales).