Is there a way to know what is the tension range a specific classical guitar is designed for?

1. How do I know what tension my guitar strings are?
2. What tension should classical guitar strings be?
3. How much tension is on a classical guitar neck?
4. What is the range of the classical guitar?

How do I know what tension my guitar strings are?

To calculate how much tension is on a guitar string:

1. Measure your guitar's scale length in inches.
2. Multiply this length by 2 and multiply the product by the frequency you want to this string to vibrate at.
3. Square this value and multiply it by the unit weight of your guitar string in pounds per inch.

What tension should classical guitar strings be?

The string gauge is 0.029” at a tension of 16.4 lbs. You can see the extra hard tension string needs to be put under a greater force to generate the same note, the low E.
...
Let's look at some numbers.

How much tension is on a classical guitar neck?

On an acoustic the neck is under almost 200 pounds of tension with medium strings. Electrics tend to be about half of that on average so figure ~100 pounds or so.

What is the range of the classical guitar?

In this configuration, the classical guitar has a 'normal' playing range spanning the notes E2 - B5, comprising, thus, 3.5 octaves + 0.5T = 43ST -> 44 notes (T = tone and ST = semitone). This is exactly half of the playing range A0 - C8 of a standard piano with 88 notes.