Math Formulas: Key Equations
Reference all the essential formulas used in our calculators.
Percentage Formula: Percentage = (Part / Whole) × 100
Example: (45 / 90) × 100 = 50%
Example: (45 / 90) × 100 = 50%
Growth Rate Formula: Growth Rate = ((Final Value - Initial Value) / Initial Value) × 100
Example: ((200 - 100) / 100) × 100 = 100%
Example: ((200 - 100) / 100) × 100 = 100%
Average Formula: Average = Sum of Values / Number of Values
Example: (10 + 20 + 30) / 3 = 20
Example: (10 + 20 + 30) / 3 = 20
Square Root Formula: √x (number whose square is x)
Example: √16 = 4
Example: √16 = 4
Compound Interest Formula: A = P (1 + r/n)^(nt)
Where A = amount, P = principal, r = rate, n = compounds, t = time
Where A = amount, P = principal, r = rate, n = compounds, t = time
BMI Formula: BMI = weight (kg) / [height (m)]²
Example: 70 / (1.75)² = 22.86
Example: 70 / (1.75)² = 22.86
Loan Payment Formula: PMT = P (r (1+r)^n) / ((1+r)^n - 1)
Where PMT = payment, P = principal, r = monthly rate, n = periods
Where PMT = payment, P = principal, r = monthly rate, n = periods
Tip Formula: Tip = Bill Amount × (Tip Percentage / 100)
Example: 50 × (20 / 100) = 10
Example: 50 × (20 / 100) = 10