Best Time to Post Calculator

Pick where most of your audience is based and get a generic, research-backed posting window in their local time - based on the same published studies covered on this blog. Free, no signup.

Approximate standard time zone offset - doesn't account for daylight saving shifts.

Strongest window

2:00 PM - 5:00 PM

Tuesday or Wednesday, in your audience's local time.

Avoid this window

1:00 AM - 3:00 AM

Consistently the lowest-engagement slot across the data.

Lunch-hour alternative

9:00 AM

A reasonable middle-ground slot if your audience spans multiple regions.

This is a generic, industry-wide estimate - built from published analyses of hundreds of thousands of Substack Notes, not your own posting history. Two of the studies behind this also found something more important than the exact hour: what happens in the first couple hours after you post matters more than which hour you picked. Full breakdown and sources on the blog.

Where this posting-time estimate comes from

The window shown here is built from multiple independent analyses of hundreds of thousands of real Substack Notes, converted to your audience's local time zone. It's a reasonable starting guess for a brand-new account with no posting history of its own - not a claim that this exact hour will outperform every other hour for your specific readers.

Those same studies don't fully agree with each other, because an account's own audience composition (time zone mix, weekday habits, niche) moves the real answer around more than any single global average can capture. The moment you have your own posting history, that history is a better guide than this calculator.

Questions

Is this the actual best time for my Substack?

It's a reasonable generic starting point based on published research, not personalized to your specific audience. Your own engagement history is a better guide once you have one - that's what NotesIQ's Best Time Heatmap builds automatically.

Why do different studies suggest different best times?

Each study aggregates a different mix of accounts, niches, and audience geographies into one average. An average across unrelated accounts describes the 'average' account, which matches nobody's real audience exactly.

Does this account for my audience's time zone?

Yes - pick where most of your audience is based and the suggested window converts to that region's local time, rather than showing a raw UTC number you'd have to convert yourself.

How does NotesIQ's Best Time Heatmap differ from this?

This calculator shows one generic window from published studies. NotesIQ's Best Time Heatmap (in the extension) builds a 7-day by 6-time-slot grid from your own actual posting history, so it reflects your specific audience instead of an industry average.

This is an industry-wide average, not your own data. NotesIQ's Best Time Heatmap builds this same grid from your actual posting history instead - included with Lifetime.