CourtDayCalculator

Federal Rules of Civil Procedure

Amend a pleading once as a matter of course

Fed. R. Civ. P. 15(a)(1)

A party may amend once as a matter of course within 21 days after serving the pleading, or — if the pleading requires a response — within 21 days after service of a responsive pleading or of a Rule 12(b), (e), or (f) motion, whichever is earlier.

Not legal advice. Computed dates are informational only. Verify every deadline against the governing rule, your court's local rules, and the judge's standing orders.

How this deadline is computed

Period
21 calendar days
Counted
forward
If it lands on a non-court day
roll forward
Service extensions
mail +3 cal., overnight +3 cal., fax +3 cal.

Two 21-day clocks can run; the amendment right expires on the earlier of them. Compute both and use the earlier date.

Worked example

For a triggering event on Monday, June 15, 2026 with service by mail, the deadline under Fed. R. Civ. P. 15(a)(1) is Thursday, July 9, 2026. Every counting step is shown below.

  1. 1

    Trigger date

    Monday. The triggering event under Fed. R. Civ. P. 15(a)(1).

    Jun 15, 2026
  2. 2

    Exclude the trigger day

    The day of the triggering event is not counted. Counting begins with the next day (FRCP 6(a)(1)(A) and analogous state rules).

    Jun 15, 2026
  3. 3

    Count 21 calendar days forward

    Every day counts, including weekends and holidays. Intermediate days are not skipped for calendar-day periods.

    Jul 6, 2026
  4. 4

    Apply 3-calendar day service extension

    Service by mail adds 3 calendar day(s) to the period (Fed. R. Civ. P. 15(a)(1)).

    Jul 9, 2026
  5. 5

    No roll needed

    Thursday is a court day.

    Jul 9, 2026
  6. 6

    Deadline

    Thursday, Jul 9, 2026.

    Jul 9, 2026

Calculate your own date

Open the calculator with this rule already selected and enter your own triggering event.

Use Fed. R. Civ. P. 15(a)(1) in the calculator

Questions about Fed. R. Civ. P. 15(a)(1)

How many days is the deadline under Fed. R. Civ. P. 15(a)(1)?
21 calendar days, counted after the triggering event. A party may amend once as a matter of course within 21 days after serving the pleading, or — if the pleading requires a response — within 21 days after service of a responsive pleading or of a Rule 12(b), (e), or (f) motion, whichever is earlier.
Do weekends and holidays count toward the 21 calendar days?
Yes. Every intervening day counts, including weekends and holidays. Only the final day is adjusted: if it falls on a weekend or holiday, it rolls forward to the next court day.
Does the day of the triggering event count?
No. The day of the triggering event is excluded and counting begins the following day, under Fed. R. Civ. P. 6(a)(1)(A) and the analogous state provisions.
Does the method of service change the deadline under Fed. R. Civ. P. 15(a)(1)?
Yes. Service by mail adds 3 calendar days; by overnight adds 3 calendar days; by fax adds 3 calendar days. Personal service and any method not listed add nothing.
Worked example: what is the deadline for a triggering event on Monday, June 15, 2026?
Thursday, July 9, 2026, reached in 6 steps with service by mail.

Source and verification

Read the text of Fed. R. Civ. P. 15(a)(1)

Not yet checked against the official text. This entry encodes the rule as published, but no line-by-line verification against the current statute has been recorded. Confirm the period against the source above before relying on it.

Other U.S. Federal Courts deadlines

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