X (Twitter) Engagement Velocity Calculator

The calculator needs one row at minimum: hours since posting and the engagement total at that moment. More rows show how the pace changes.

1. Note the posting time. At each check, open the post analytics and write down the hours passed and the Engagements total.
2. Type one row per check, for example 3, 120 for 120 engagements after 3 hours. Add impressions as a third number when you have them.
3. Add your follower count and your usual pace to compare this post with your own earlier posts.

Engagement velocity is the speed at which a post collects engagements, measured in engagements per hour. A post with 258 engagements after 24 hours has an overall velocity of 10.75 per hour.

Velocity is a derived measure. The X Help Center pages we read do not define it, and post analytics show totals, not speeds. You build it from two things you can observe: the total and the clock.

What Counts as an Engagement

The X Ads glossary says engagements include all clicks on a post, including reposts, replies, likes and poll votes. Use the same count at every check. Likes alone work too, as long as every row uses likes alone.

What Velocity Is Not

Velocity is not a score, and it is not a chance of going viral. It describes what already happened. This page gives no rating bands, because none of the official pages we read publish any.

1. The tool sorts your rows by time and treats posting time as hour 0 with 0 engagements.
2. It subtracts each total from the next one to get the gain in every interval.
3. It divides each gain by the length of its interval in hours.
4. It finds the interval with the highest pace and compares the latest pace with the first.
5. It finds the check where the total passed half and draws a straight line inside that interval to estimate the time.

Rows with a missing number, zero hours or a repeated time are skipped and counted in a note under the table.

Example values only, not benchmarks. An account with 6,000 followers checks one post five times. The running totals are 48 engagements at 1 hour, 120 at 3 hours, 174 at 6 hours, 222 at 12 hours and 258 at 24 hours.

• Overall velocity = 258 / 24 = 10.75 per hour, shown as 10.8.
• Peak interval = 0 to 1 hour at 48.0 per hour.
• Latest pace vs first pace = (3 - 48) / 48 = -93.8%.
• Share gained by the first mark = 48 / 258 = 18.6%.
• Half of 258 is 129. The total passed 129 between hour 3 and hour 6, at about 3.5 hours.
• Pace per 1,000 followers = 10.75 / 6,000 x 1,000 = 1.79 per hour.

The post earned half of its 24-hour total in the first 3.5 hours. The overall figure of 10.8 hides a first hour of 48 and a last interval of 3.

When You Check

Overall velocity falls as hours pass on a slowing post. The same post reads 48.0 per hour at hour 1 and 10.8 at hour 24. Compare posts at the same age only.

How Many Checks You Take

Two checks give one average. Five checks show the shape. Wide gaps between checks hide short bursts inside them.

Posting Time

A post published while most of your audience is offline can start slowly and pick up later. The third preset shows that pattern, with the peak between hours 4 and 8.

Reposts by Larger Accounts

A repost puts the post in front of a new audience. The interval that contains it shows a jump that your own followers did not cause.

Undone Actions

People can remove a like or a repost. A total that drops between two checks produces a negative interval, and the tool flags it.

The two measures use the same totals and answer different questions.

Velocity counts speed, and rate counts share. For engagements as a share of impressions, use the X engagement rate calculator. For how long a post keeps collecting impressions, use the post lifespan calculator.

Comparing Two Posts at the Same Age

Check both posts at 1, 3 and 6 hours. Equal ages make the comparison fair, which totals taken on different days do not.

Deciding When a Post Is Finished

A latest interval near zero means the post has stopped collecting engagements. That is a reasonable time to record its final numbers.

Testing Posting Times

Log first-hour velocity for posts published at different hours across several weeks. Your own log is the evidence; no universal best time is assumed here.

Watching a Poll

Votes count as engagements, so a poll has a velocity too. The poll engagement calculator adds votes per hour of poll duration.

Reporting a Launch

Pair first-hour pace with reach. The impression-to-engagement ratio calculator shows how many impressions each engagement took.

1. Entering Gains in Place of Totals

The rows need running totals. Typing 48, 72, 54 as gains makes the tool read a falling total.

2. Comparing Posts at Different Ages

A 2-hour-old post often shows a higher overall velocity than a 2-day-old post. Match the hours first.

3. Calling a Fast Start a Prediction

A strong first hour describes the first hour. The example post fell from 48.0 to 3.0 per hour within a day.

4. Mixing Engagement Definitions

Likes at one check and the full Engagements total at the next create a jump that never happened.

5. Guessing Impressions

Impressions cannot be derived from follower count. Leave the third column empty when you do not have the real figure.

6. Trusting a Half-Time from Two Rows

The half-time estimate assumes steady gains inside an interval. Wide intervals make it rough.

The arithmetic is exact for the rows you type. The picture is only as fine as your checks.

Divide total engagements by hours since posting. A post with 150 engagements after 6 hours has a velocity of 25 per hour.

No official figure exists in the X Help Center pages we read. Compare a post with your own earlier posts at the same age, because account size and posting time both change it.

Overall velocity averages the whole life of the post. Interval velocity covers one stretch. A post with 90 engagements at 2 hours and 150 at 6 hours ran at 45 per hour first and 15 per hour after.

Record at least three checks on the first day, such as 1, 3 and 24 hours. Closer checks early on show the first burst more clearly.

Yes. Any single count works, as long as every row uses the same count. The result is then likes per hour.

No. Velocity describes the past. This calculator makes no prediction, and the pages we read publish no speed threshold.

The total fell between two checks. People can undo likes and reposts, or one of the totals was mistyped.

Use the pace per 1,000 followers. A pace of 45 per hour on 1,500 followers equals 30 per hour per 1,000 followers.

It shows how front-loaded the post was. A short time to half means most engagement arrived early in the period you measured.

No. The maths runs in your browser and nothing is sent to us. Save keeps a result only in this browser.

• X Ads glossary (X Help Center, read 2026-10-03; engagements include all clicks on a post, including reposts, replies, likes and poll votes).
• View counts (X Help Center, read 2026-10-03; how views are counted, used here for the optional impressions column).
• About X Polls (X Help Center, read 2026-10-03; poll duration limits, relevant when the post is a poll).