Riot had to put all the agents in one universal size so as to not mess up crosshair placement. Obviously there are minor differences like if you were to compare Brimstone to Jett. This means all Valorant characters are all equally as tall, but how tall? People have tried measuring characters with objects that we also have in real life, such as soda cans, and while this method is valid, it's not a 100% in-game measurement.

With the addition of icebox, we finally got a canon volume of an object within the game, and that object are the containers. It's written on them that the cubic capacity is 32.5 cubic meters, and from here we can start working backwards to find the exact dimensions of the container.

To start we need to do some pixel measurements. Looking at this image, we can actually see that the width AND height of this container are exactly the same. 331 pixels. But now we need to figure out the length.

Looking at this image we can do more pixel measurements to find out exactly how much bigger the length is than the width/height. Now in this image I was slightly further away so the width is different than from what it was before, but this doesn't matter because we're only here to compare how much bigger the width is to the length.

We can see that the length of the container is 767 pixels, which is 2.973 times bigger than the width. And here we can work our way to find the exact dimensions of the container.

The formula we'll be using is a^2×(a×2.973)=32.5 cubic meters. Now because I'm not that good at math I had to use a calculator so here's an image of a step-by-step way of getting the a. So now we finally know that our container is 2.219 meters tall, 2.219 meters wide, and 6.597 meters long. And from here we can compare an agent to a container and figure out their height. The question is, which agent will we use?

Now here is where our answer may be off by a few centimeters, because nobody in the game stands upright. The closest we can get is Cypher while using his camera, but he still isn't fully upright. So our answer will be off by only a few centimeters. We also have to get rid of his hat by using his ultimate and we can now compare him to the container.

Using this image, we can see that Cypher is 169 pixels tall, and the container is 301 pixels. Doing some more basic math, specifically dividing 221.9 centimeters with 301 pixels we can see that each pixel represents 0.737 centimeters. So we multiply the height of Cypher in pixels with 0.737 and we get 124.553 centimeters.

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TL;DR All Valorant characters are 124.553 centimeters tall, or 4 feet and 1.4303 inches. Now obviously Riot did not take the height of characters into consideration, but that doesn't change the fact that this is 100% canon information. The game itself tells us that the containers are 32.5 cubic meters in volume. If Riot ever releases a very tall character, (which they won't because it will ruin crosshair placement) while they will be towering over other agents, they will probably be the average height of a human.

You can still go into extreme details like comparing 3D objects in a program like Blender or something but your final answer may be at most 3 centimeters give or take off from mine.

Edit 1: I made a mistake. I forgot that the 32.5 cubic meters measures the volume the container can hold INSIDE, this is what "CU CAP" means on the container, and it's short for "cubic capacity". u/dezholling mentioned this in the comments. But not all is lost because we can use the inside of the container above B site to figure out the exact answer, which I will add to this post once I do.