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Quarter Dates Calculator

Work out quarter dates instantly with clear inputs, formula shown and shareable results.

About Quarter Dates Calculator

Quarters are three-month blocks counted from the fiscal year start. On a calendar basis Q3 2026 runs 1 July to 30 September - 92 days containing 66 working days. Quarters are unequal in length, from 90 days in Q1 of a common year to 92 in Q3, which matters when comparing quarterly revenue.

Formulas

Quarter start

start month = fiscal start + 3 x (quarter - 1)

Quarter end

the day before the start of the following quarter

Worked example

With the default values below, Quarter Dates Calculator returns Days In The Quarter of 92. Change any input above and every figure here is recalculated in your browser.

Inputs used

Quarteraccepts 1–4
3
Yearaccepts 1,900–2,200
2,026
Fiscal year starts in monthaccepts 1–12
1

Results

Days In The Quarter
92 days
Quarter Start Date
2026-07-01
Quarter End Date
2026-09-30
Working Days In The Quarter
66

Step by step

  1. 1Values used
  2. 2Quarter start
  3. 3Quarter end
  4. 4Days In The Quarter= 92 days
  5. 5Quarter Start Date= 2026-07-01
  6. 6Quarter End Date= 2026-09-30
  7. 7Working Days In The Quarter= 66

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to whole numbers, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Are quarters equal in length?

No. Q1 has 90 or 91 days while Q2, Q3 and Q4 have 91 or 92, so like-for-like revenue comparisons should normalise per day.

Why do companies use different quarter boundaries?

Because they follow their own fiscal year. A company with an April year end has its Q1 running April to June.

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Quarter Dates Calculator – Calculate Days In The Quarter