Evertune Tension Calculator

Calculate string tension and find the perfect EverTune saddle for your tuning.

What is an EverTune Tension Calculator?

An evertune tension calculator is a specialized tool designed for guitarists who use the EverTune bridge system. Unlike traditional bridges, the EverTune uses a complex system of springs and levers to maintain constant tension on the string, effectively keeping the guitar in tune regardless of temperature changes or how hard you strike the strings. Using an evertune tension calculator is vital because each EverTune saddle has a specific operating range (Standard, Low, or High tension). If your desired tuning and string gauge fall outside this range, the bridge will not function in its “Zone 2” (the constant tension state).

Guitarists use the evertune tension calculator to ensure their custom tunings—such as Drop A or C Standard—are physically compatible with the springs installed in their bridge. Using the wrong combination can lead to the bridge “bottoming out” or failing to reach the required tension to engage the mechanism.

EverTune Tension Calculator Formula and Mathematical Explanation

The calculation of string tension is based on Mersenne’s laws for vibrating strings. The formula used by our evertune tension calculator is:

T = (UW × (2 × L × f)²) / 386.4

Variable	Meaning	Unit	Typical Range
T	Tension	Pounds (lbs)	10 – 45 lbs
UW	Unit Weight	lbs/linear inch	0.00001 – 0.0007
L	Scale Length	Inches	24.75 – 30.0
f	Frequency	Hertz (Hz)	40 – 1000 Hz

Caption: Variables used in the evertune tension calculator to determine physical pull on the bridge.

Practical Examples (Real-World Use Cases)

Example 1: High E String in Standard E Tuning

For a standard 25.5-inch scale guitar, a .010 gauge plain steel string tuned to E4 (329.63 Hz) results in approximately 16.2 lbs of tension. According to the evertune tension calculator, this falls perfectly within the Standard Tension Saddle range (typically 15-28 lbs).

Example 2: Low B String for 7-String Metal Setup

If you use a .060 gauge nickel-wound string on a 26.5-inch scale baritone, tuned to B1 (61.74 Hz), the evertune tension calculator yields roughly 18.5 lbs. This remains within the Standard saddle range, but moving to a .070 gauge for a “snappier” feel would push it toward 24 lbs, approaching the limit for standard springs.

How to Use This EverTune Tension Calculator

1. Enter Scale Length: Measure from the nut to the bridge of your guitar. Standard Fender is 25.5, Gibson is 24.75.
2. Select Gauge: Choose the specific thickness of the string you are calculating for.
3. Set Tuning: Pick the note and the octave. For example, the low E on a standard guitar is E2.
4. Check Recommendation: Look at the evertune tension calculator result to see if you need a Low, Standard, or High tension saddle replacement.

Key Factors That Affect EverTune Tension Calculator Results

• Scale Length: Longer scales (like baritones) significantly increase tension for the same pitch and gauge.
• Unit Weight: The material (Nickel, Steel, Cobalt) and whether the string is wound or plain changes the mass, affecting the evertune tension calculator output.
• Pitch Frequency: Every half-step increase in pitch requires more tension. Dropping a full step significantly reduces the pull on the spring.
• Spring Elasticity: EverTune springs have a “sweet spot.” Even if the evertune tension calculator says 12 lbs is possible, a Low Tension saddle will feel more responsive than a Standard saddle at that limit.
• Core to Wrap Ratio: Different string brands (D’Addario vs. Ernie Ball) may have slight variations in unit weight for the same gauge.
• Ambient Temperature: While EverTune compensates for this, extreme cold can slightly shift the physical equilibrium of the spring.

Frequently Asked Questions (FAQ)

Can I use any strings with EverTune?

Yes, but you must verify the tension with an evertune tension calculator. If the tension is too high, you risk damaging the spring; too low, and the bridge won’t stay in Zone 2.

What are the standard EverTune saddle ranges?

Standard saddles usually handle 15 to 28 lbs. Low tension saddles handle 10 to 15 lbs, and High tension saddles handle 25 to 45 lbs.

Why does my guitar not stay in tune in Zone 2?

It’s likely your tension is outside the saddle’s operating range. Use the evertune tension calculator to check if you need a different saddle type.

Does the calculator work for multi-scale guitars?

Yes, simply enter the specific scale length for the individual string you are calculating.

How accurate is this tension calculation?

The evertune tension calculator is accurate to within 1-2%, which is sufficient for guitar setup and saddle selection.

Do I need a high tension saddle for drop tunings?

Usually, the opposite! Drop tunings reduce tension, so you might need a thicker gauge or a Low Tension saddle. Always check the evertune tension calculator.

What happens if I exceed 45 lbs?

You may break the string or exceed the physical limit of even the High Tension EverTune spring.

Can I mix saddle types?

Absolutely. Many players use a High Tension saddle for the low strings and Standard for the rest.

Related Tools and Internal Resources

• Comprehensive String Gauge Guide – Learn how to pick the right diameter for your playing style.
• Guitar Setup Tips – A deep dive into intonation and action.
• Standard Tuning Chart – Every frequency for every note on the fretboard.
• Baritone Conversion Calculator – Calculate tension when switching to longer scales.
• The Physics of Drop Tuning – Why low notes require more mass.
• EverTune Maintenance Guide – How to keep your springs in top shape.