How can i get frames per second using delta time

Question

How can i get frames per second using delta time.

Here's my code that return delta time

auto const old = last;
last = steady_clock::now();
const duration<float> frameTime = last - old;
return frameTime.count();

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Answer 1

Suppose your delta time is in milliseconds, then fps (frames per second) is calculate as fps = 1000 / delta_time.