The Leather Bench

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.

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 the industry default).
  • 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

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

FAQ

Should I use trouser size instead of waist?

No. Trouser sizing runs small; always measure the actual wearing position.

How far apart should the holes be?

1 inch (2.54 cm) is standard. Use 2 cm for dress belts and 3 cm for heavy work belts.

What hole size do I punch?

Match the buckle prong — usually a 4 mm oblong or round punch.

How thick should belt leather be?

3.2-4.4 mm (8-11 oz) vegetable-tanned leather holds shape without a liner.

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