Calculator Inputs
Example Data Table
Use this table as a starting point for a common electric guitar set.
| String | Gauge | Pitch | Scale | Type | Expected Feel |
|---|---|---|---|---|---|
| 6th | 46 | E2 | 25.5 in | Wound | Medium low-string pull |
| 5th | 36 | A2 | 25.5 in | Wound | Balanced rhythm feel |
| 4th | 26 | D3 | 25.5 in | Wound | Stable middle tension |
| 3rd | 17 | G3 | 25.5 in | Plain | Firm lead response |
| 2nd | 13 | B3 | 25.5 in | Plain | Smooth bends |
| 1st | 10 | E4 | 25.5 in | Plain | Flexible top string |
Formula Used
The calculator uses the standard string tension equation:
T = UW × (2 × L × F)2 ÷ 386.0886
T is tension in pounds. UW is unit weight in pounds per inch. L is scale length in inches. F is pitch frequency in hertz. The constant converts inch based mass units into pounds force.
Plain string unit weight is estimated from diameter and material density. Wound string unit weight is estimated from core diameter, wrap fill, and wrap density. Use a manufacturer unit weight when exact catalog data is available.
How to Use This Calculator
- Enter each string name, gauge, material, note, octave, and scale length.
- Use cents for small tuning offsets or custom frequency for exact pitches.
- Enter custom unit weight when you have exact string data.
- Set target minimum and maximum tension values for your preferred feel.
- Click calculate to show results above the form.
- Download CSV for spreadsheets or PDF for a quick setup record.
Article: Building a Better String Set
Why Tension Matters
String tension shapes the way an instrument feels. A higher value can feel tight and stable. A lower value can feel soft and easy to bend. Both can be useful. The best choice depends on tuning, scale length, playing style, and setup. This calculator helps compare those choices before changing strings.
Gauge Is Only One Part
Many players choose strings by gauge alone. Gauge matters, but it is not the whole story. A longer scale length raises tension. A higher pitch also raises tension. Wound string construction can change unit weight. Two strings with the same outside gauge may not pull the same way. That is why unit weight is important.
Balancing a Set
A balanced set does not need identical tension on every string. It should feel even across the neck. Rhythm players may prefer a firmer bass side. Lead players may prefer lighter treble strings. Drop tunings often need heavier lower strings. Baritone instruments usually need different gauges because scale length changes the result.
Using the Results
Start with your current set. Calculate its total and per string values. Then change one gauge or tuning at a time. Watch how the tension changes. Keep notes after each test. The CSV and PDF exports make that easy. These numbers are planning estimates. Final comfort still depends on action, nut slots, bridge setup, and personal touch.
Safe Adjustments
Large tension changes can affect neck relief and intonation. Make small changes when possible. Check tuning stability after each change. If the total set tension changes a lot, inspect the setup carefully. A good setup keeps the guitar comfortable, stable, and reliable.
FAQs
1. Is this calculator only for electric guitar?
No. You can use it for electric guitar, acoustic guitar, bass, baritone, and custom stringed instruments. Enter the correct scale length, pitch, material, and gauge for each string.
2. Why does scale length change tension?
A longer scale needs more pull to reach the same pitch with the same string. Shorter scales feel softer because the same string reaches pitch with less tension.
3. What is unit weight?
Unit weight is the weight of one inch of string. It is the best input for accurate tension. If you do not know it, the calculator estimates it from gauge, material, and construction.
4. Are wound string results exact?
They are close estimates unless you enter exact unit weight. Wound strings vary by core size, wrap wire, and winding method. Manufacturer unit weight data improves accuracy.
5. What tension range feels balanced?
Many guitar strings feel comfortable between 14 and 20 pounds. This is not a rule. Some players prefer softer bends, while others prefer firmer attack and tuning stability.
6. Can I calculate drop tuning tension?
Yes. Change the note and octave for each string. You can also enter cents or a custom frequency for special tunings, microtonal setups, or nonstandard pitch references.
7. Why enter A4 reference frequency?
A4 controls pitch calculation. Most players use 440 Hz. Some orchestras, studios, or personal setups use different references, which slightly changes every calculated frequency.
8. Should I adjust my guitar after changing tension?
Yes, if the change is large. Different total tension can affect neck relief, action, intonation, and tremolo balance. Check the setup after changing gauges or tunings.