Mathematical & Financial Formula Hub
Peer-verified equations, variable definitions, and step-by-step worked calculations for online tools.
Discount Formula
The discount formula calculates the price reduction on a product or service. By subtracting the discount amount from the original price, you get the final sales price.
Domestic Help Fair Salary Formula
Determining fair, market-aligned compensation for domestic workers (maids, cooks, nannies, and all-round helpers) in India requires evaluating city tier living costs, apartment square footage, specific task combinations, family member headcount, and specialized care requirements. This formula synthesizes statutory state Minimum Wage benchmarks with prevailing residential society market standards to calculate equitable and transparent monthly remuneration.
Domestic Help Festival Bonus (Diwali / Puja) Formula
In Indian household culture, offering a festival bonus (Baksheesh / Diwali Bonus / Puja Gift) to domestic staff (maids, cooks, drivers, security guards) is a vital customary tradition that recognizes loyal service and provides meaningful financial support during major festive celebrations. While informal domestic workers are not legally covered under the Payment of Bonus Act 1965, the industry standard formula aligns with the 1-month salary benchmark (8.33% to 100% of annual wage prorated by completed tenure months).
EMI Formula
An Equated Monthly Installment (EMI) is a fixed payment amount made by a borrower to a lender at a specified date each calendar month. The EMI is structured to pay off both the interest and the principal balance of a loan over a set period. In the early stages of the loan, a larger portion of the monthly payment goes toward interest, while in later stages, more goes toward the principal. This amortization schedule helps borrowers plan their monthly budget and track their path to debt freedom.
EPF / PF Calculation Formula
The Employee Provident Fund (EPF or PF) calculation formula computes monthly accumulation and annual interest crediting for organised sector employees in India under EPFO rules. Employees contribute 12% of Basic + DA, matched by a 12% employer contribution (split into 8.33% for Pension EPS capped at ₹1,250 and 3.67% into EPF / PF). Monthly contributions earn interest calculated monthly and credited annually at government-notified EPFO rates.
FD Formula
A Fixed Deposit (FD) is a secure investment offered by banks and financial institutions where you deposit a lump sum for a fixed tenure at a guaranteed interest rate. FDs usually calculate compound interest on a quarterly basis. It offers steady, predictable growth on capital.
Gratuity Formula
Gratuity is a lump-sum payment made by an employer to an employee as a token of appreciation for services rendered, typically after completing 5 or more years of continuous employment.
In-Hand Take-Home Salary Formula
In-hand salary (take-home pay) is the net amount deposited into an employee bank account after statutory payroll deductions and monthly tax withholding under New or Old Tax Regimes.
Inflation Purchasing Power Formula
Inflation formulas measure how rising consumer price indices erode money purchasing power over time, calculating equivalent future cost of living requirements.
Inflation Rate Formula
The Inflation Rate Formula calculates the percentage change in the Consumer Price Index (CPI) over a specific period, measuring price inflation and purchasing power loss.
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