Fitment Factor Calculator

When a pay structure is revised, the government needs one rule to move every employee from the old scale to the new one. The fitment factor is that rule: a single multiplier applied to existing basic pay to arrive at the new basic pay.

New basic pay = Existing basic pay × Fitment factor

Two things follow from this, and both matter when reading any estimate:

• The factor applies to basic pay or basic pension only. Allowances are recalculated separately, under rules set at the same time.
• In a real revision, the multiplied figure is then fitted into a pay matrix cell, which usually rounds it. A calculator without an official matrix can only show the unrounded multiplication, which is what this one does.

Verify the historical figures in the relevant gazette notifications and pay rules through the official sources listed below. The 8th Pay Commission row will change on this site only when an official notification exists.

Estimated revised basic pay or pension
  = Current basic pay or pension × Selected fitment factor

Estimated monthly increase
  = Estimated revised amount − Current amount

Percentage increase
  = Monthly increase ÷ Current amount × 100

Number of applicable months
  = completed whole months from implementation date to payment date

Estimated arrears
  = Monthly increase × Number of applicable months

• The fitment factor is a value you choose. Nothing on this site is an announced or approved figure.
• The calculation applies the factor to basic pay or basic pension only.
• Dearness allowance, dearness relief, house rent allowance, transport allowance, NPS or UPS deductions and income tax are not included.
• Any future pay matrix, rounding rule or minimum-pay floor that the government may adopt is not applied, because none has been published.
• Arrears assume the full monthly difference is payable for every completed month in the period you selected, with no deduction, recovery or tax adjustment.
• Implementation and payment dates are assumptions you enter, not announced dates.

How arrear months are counted

Arrear months are counted as completed whole months between the implementation date and the payment date. A month is counted only once it has been fully completed, so:

• 1 January 2026 to 1 July 2026 is 6 months.
• 1 January 2026 to 1 January 2027 is 12 months.
• 1 January 2026 to 31 December 2026 is 11 months, because the twelfth month is not yet complete.
• Two identical dates give 0 months and therefore no arrears.

The same rule is applied everywhere on this site, and the calculator always prints the exact number of months it used.

• 8th Central Pay Commission — official website Primary source

  The Commission’s own site, hosted by the National Informatics Centre. The primary source for Commission notices, notifications and updates.

• 8th CPC — Terms of Reference

  The Terms of Reference issued on 3 November 2025, as published by the Commission.

• Gazette notification dated 3 November 2025 constituting the Commission

  The notification itself, as published by the Commission (PDF).

• 8th CPC — press releases

  Including the Government press release dated 28 October 2025.

• Department of Expenditure — Central Pay Commission

  The Ministry of Finance department that issues pay, allowance and pension office memoranda giving effect to a pay commission.

• Press Information Bureau

  Official Government of India press releases, including Cabinet decisions on pay commission recommendations.

• Department of Pension & Pensioners’ Welfare

  Orders on pension revision, family pension and dearness relief.

• Department of Personnel & Training

  Service conditions and establishment orders.

• e-Gazette, Government of India

  The gazette of record. A figure is official once it is notified here.