Fret Position Template Generator

What this tool is for

Calculate cumulative and adjacent 12-TET fret positions with calibrated print references. Geometry tools apply explicit models to named measurements. A coordinate or angle must still be checked against a physical drawing, real hardware, tolerances, and material behavior.

Use it when you can describe the current state and need a defensible next check. It is not a shortcut around inspection: preserve the starting state, change one variable, and verify the result under the same conditions.

Before you begin

Confirm nominal scale between nut and theoretical saddle line, choose one unit, name the nut witness point, and verify the calibration bar before transferring a mark.

Use a stable, tuned instrument unless the page specifically investigates tuning.
Name the physical reference, unit, and test condition beside every important number.
Keep the original measurements so any reversible change can be returned to baseline.

Input guide

Scale length (selected unit): sets the interpretation and display unit; do not mix units elsewhere in the same run.
Input and display unit: sets the interpretation and display unit; do not mix units elsewhere in the same run.
Number of frets: provides a measured or counted input; confirm the allowed range and repeat the reading before relying on it.
Primary measurement reference: classifies an observed condition; choose “unknown” or “not tested” instead of guessing when available.
Optional compensation note: captures the exact observation, list, or requirement that the result must preserve.
Print mode: classifies an observed condition; choose “unknown” or “not tested” instead of guessing when available.
Paper size: classifies an observed condition; choose “unknown” or “not tested” instead of guessing when available.
Orientation: classifies an observed condition; choose “unknown” or “not tested” instead of guessing when available.
Measured 50mm calibration bar (mm): provides a measured or counted input; confirm the allowed range and repeat the reading before relying on it.
Allowed calibration error (mm): provides a measured or counted input; confirm the allowed range and repeat the reading before relying on it.

Input labels describe evidence, not targets. A placeholder demonstrates format only; it is never a recommendation for a particular guitar.

How the result should be read

Compare nut-to-fret cumulative values against an independent rule or CAD fixture. Saddle compensation does not move nominal 12-TET fret slots.

Read priorities from top to bottom, but stop as soon as new evidence contradicts an earlier assumption. Save or print the result ticket with the entered conditions so another person can reproduce the decision.

Method and logic

Cumulative fret coordinate is d=s−s/2^(n/12). Adjacent spacing is the difference between successive coordinates; internal millimetres retain precision until display.

The page keeps calculation and diagnostic claims deliberately bounded. Display rounding improves readability, while the underlying logic uses entered values; descriptive branches report relative tendencies and the evidence needed to confirm them.

Worked example

At 25.5 inches, fret 12 is 12.750 inches from the nut and fret 24 is 19.125 inches. Those invariants make useful checks before relying on the full table.

The example demonstrates reasoning, not a universal setup specification. Substitute real measurements and repeat the final test before accepting the next action.

Assumptions and limitations

The model does not design temperament offsets, nut compensation, kerf, slot depth, fret crown, or structural margins. A printed scale must pass both calibration bars physically.

Instrument design, service history, measurement error, and player technique can outweigh a calculator or checklist. Where manufacturer instructions exist for the exact hardware, use those instructions and record the revision consulted.

Safety and stop conditions

Stop for abnormal resistance, cracking, heat, odor, electrical sensation, moving wood or joints, a measurement that cannot be repeated, or any step that would remove material without a confirmed cause. Secure strings and stored mechanical energy before hardware work. Refer structural, fret-cutting, mains-powered, or uncertain repairs to a qualified technician.

Related workflow

Fret Slot Print Template — Tile full-scale fret-slot marks across calibrated pages with overlap and registration marks.
Scale Length Identifier — Estimate scale length from nut-to-12th-fret or nut-to-bridge measurements.
Geometry Measurement Definitions — Name every datum before entering a number.

Open the related page that answers the next unresolved question; do not run every tool as if every system needs adjustment.