Belt Length Calculator

Cut a belt to the right blank length with correctly spaced holes.

Tool Operation Area

Turns a waist measurement into a full belt blank length, buckle fold allowance, hole positions and tip length.

Worked Example

Waist measurement: 86 cm; Belt width: 3.8 cm; Buckle type: Standard centre-bar buckle (8 cm fold); Number of holes: 5; Hole spacing: 2.54 cm.

Belt blank to cut: 109.44 cm; Buckle fold allowance: 8.00 cm; Tip length (point to first hole): 8.36 cm; Hole positions from the tip: 8.36, 10.90, 13.44, 15.98, 18.52 cm; Centre hole sits at: 13.44 cm from the tip.

How It Works

Belt size is measured from the buckle fold to the centre hole, so the blank must add the fold, the waist and half the hole run.
The tip is proportional to the belt width — roughly 2.2 times the width gives a balanced English point.
Holes are laid out symmetrically around the centre hole at your chosen spacing (2.54 cm / 1 inch is this example’s starting value).
A 2 cm working margin is added so you can trim the tip cleanly after fitting.

[buckle fold]===============o o o o o >
     fold        body       holes   tip

Schematic diagram of the calculation.

How to Use

1Measure the waist over the trousers where the belt will actually sit, not the trouser tag size.
2Pick the buckle fold that matches your hardware.
3Use an odd hole count so there is a true centre hole.
4Cut the blank to the highlighted length, fit, then punch from the centre hole outwards.