Formulas & Logic
The Math Behind The Magic
At CalculateMaster, we believe in total transparency. Our suite of calculators is powered by standard, universally recognized mathematical algorithms. Below is a detailed breakdown of the logic and formulas powering our most popular tools.
1. EMI (Equated Monthly Installment) Calculator
Our EMI calculator uses the standard banking formula to determine your exact monthly payment for home, auto, or personal loans.
- E = EMI (Equated Monthly Installment)
- P = Principal Loan Amount
- r = Rate of interest calculated on a monthly basis (i.e., Annual Rate / 12 / 100)
- n = Loan tenure in months
2. BMI (Body Mass Index) Calculator
The BMI calculation is based on the World Health Organization (WHO) standard metric formula for assessing body tissue mass.
For users inputting Imperial units (Pounds/Inches), the formula is adapted internally by multiplying the result by a conversion factor of 703.
3. Compound Interest Calculator
We use the standard periodic compounding formula to forecast the future value of your investments or deposits.
- A = Final accumulated amount (Principal + Interest)
- P = Initial Principal balance
- r = Annual interest rate (as a decimal)
- n = Number of times interest is compounded per year
- t = Number of years the amount is deposited or borrowed
4. GST (Goods and Services Tax) Calculator
Our GST tool can seamlessly add or remove tax from a given figure using precise percentage ratios.
Final Amount = Base Price + (Base Price × GST%) / 100
Removing (Extracting) GST:
Base Price = Total Price - [Total Price × (100 / (100 + GST%))]
Precision & Rounding Logic
To ensure high accuracy, CalculateMaster processes all mathematical operations internally using double-precision floating-point format (IEEE 754). For the final user interface, currency outputs are rounded to two decimal places (e.g., ₹1,000.50), while dates and standard integers are delivered as whole numbers unless otherwise specified by the user.