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Unity FPS Counter

0 Comments - Dec 20, 2021
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In video games, frames-per-second (or fps for short) is a value that represents the number of frames that the computer renders in one second.

Frames-per-second is a great indicator of performance and can be used during the optimization process, or simply to get feedback on how fast/smooth the game runs.

In this tutorial, I will be showing how to add a simple fps counter to your game in Unity.

Steps

To show fps in-game, we will need to create a script that will count frames and show them on the screen.

  • Create a new script, call it "SC_FPSCounter" and paste the code below inside it:

SC_FPSCounter.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SC_FPSCounter : MonoBehaviour
{
    /* Assign this script to any object in the Scene to display frames per second */

    public float updateInterval = 0.5f; //How often should the number update

    float accum = 0.0f;
    int frames = 0;
    float timeleft;
    float fps;

    GUIStyle textStyle = new GUIStyle();

    // Use this for initialization
    void Start()
    {
        timeleft = updateInterval;

        textStyle.fontStyle = FontStyle.Bold;
        textStyle.normal.textColor = Color.white;
    }

    // Update is called once per frame
    void Update()
    {
        timeleft -= Time.deltaTime;
        accum += Time.timeScale / Time.deltaTime;
        ++frames;

        // Interval ended - update GUI text and start new interval
        if (timeleft <= 0.0)
        {
            // display two fractional digits (f2 format)
            fps = (accum / frames);
            timeleft = updateInterval;
            accum = 0.0f;
            frames = 0;
        }
    }

    void OnGUI()
    {
        //Display the fps and round to 2 decimals
        GUI.Label(new Rect(5, 5, 100, 25), fps.ToString("F2") + "FPS", textStyle);
    }
}
  • Attach SC_FPSCounter script to any object in the Scene and press Play:

Frames-per-second

Fps should now be displayed in the top-left corner.

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