If you're a central or state government employee in India, or you're trying to understand a family member's salary slip, you've probably run into the term "7th Pay Commission" and a fitment factor of 2.57 without a clear explanation of what that actually means for the rupee amount you take home. Here's how the revision actually works.
What a Pay Commission is
The Government of India periodically sets up a Pay Commission to review and revise the salary structure of central government employees (state governments typically follow with their own, similar revisions). This has historically happened roughly once a decade. The 7th Central Pay Commission was implemented with effect from January 1, 2016, and it didn't just increase numbers -- it also replaced the older pay band and grade pay system with a new pay matrix.
Pay band + grade pay vs. the pay matrix
Under the 6th Pay Commission, an employee's pay was calculated from a pay band (a salary range for their level) plus a separate grade pay (a fixed amount tied to their rank). Adding those together, then applying dearness allowance on top, produced the gross salary. The 7th Pay Commission replaced this with a single pay matrix -- a grid where your level (based on your old grade pay) determines a column, and your years of service within that level determine which cell, and therefore which specific basic pay figure, applies to you.
What the fitment factor actually does
To move existing employees from the old system into the new matrix, the commission applied a uniform fitment factor of 2.57 to the existing basic pay (basic pay plus grade pay under the old structure). In simple terms: your old basic pay was multiplied by 2.57, and the result was rounded to the nearest figure available in the new pay matrix for your level. That multiplication is why a jump from, say, an old basic pay figure to a much higher new one can look dramatic on paper -- it isn't a raw increase of that magnitude, it's a restructuring of how basic pay is calculated combined with a real increase.
Basic pay isn't your final salary
The pay matrix figure is your revised basic pay, not your total salary. Dearness allowance, house rent allowance, and other components are calculated as percentages on top of that basic pay figure, and those percentages are revised separately and periodically. So two employees with the same basic pay under the 7th CPC can still end up with different gross salaries depending on their city classification (which affects HRA) and other allowances specific to their role.
Estimating your own revised pay
Working through the pay matrix and fitment factor by hand is tedious, especially if you're not sure which level or cell applies to you. The 7th CPC Calculator lets you estimate your revised basic pay under the fitment factor directly, without digging through the matrix tables yourself.