Great — let’s walk through an example to help you clearly understand why real-time WPM/CPM while typing differs from the final WPM/CPM after the timer ends.

🧠 First, a Quick Recap:

📌 What are WPM and CPM?

WPM (Words Per Minute) = how many words you type in a minute.

CPM (Characters Per Minute) = how many characters you type in a minute.

🎯 What’s the difference?

👉 Real-time WPM/CPM is calculated while you're still typing — the timer is running and the time so far is used.

👉 Final WPM/CPM is calculated after the full timer ends — the entire duration (like 30 seconds) is used.

📦 Example:

Let’s say you choose a 30-second test.

At 15 seconds, you’ve typed:

• 150 characters = CPM so far
• 30 words = WPM so far

🔸 Real-time calculation (at 15 sec):

seconds = 15

CPM = (150 / 15) * 60 = 600

WPM = (30 / 15) * 60 = 120

So you’ll see:

• 🟡 Real-time CPM: 600
• 🟡 Real-time WPM: 120

⏱ Now you slow down...

In the next 15 seconds, you only type:

• 50 characters (total now = 200)
• 10 more words (total now = 40)

🔹 Final calculation (at 30 sec):

seconds = 30

CPM = (200 / 30) * 60 = 400

WPM = (40 / 30) * 60 = 80

So at the end:

• 🟢 Final CPM: 400
• 🟢 Final WPM: 80

⚠️ Why this difference?

Because real-time stats are based on time-so-far (smaller number) and final stats use full time (bigger number).

So:

• If you type fast in the beginning → real-time stats will look high.
• If you slow down later → final stats will drop because average speed reduces.

✅ What should be shown?

Both are fine:

• Real-time helps for motivation and feedback.
• Final is more accurate because it’s based on total time.