The Leather Bench

Hardware Quantity Estimator

Count rivets, eyelets and snaps before you order hardware.

Tool Operation Area

Estimates hardware counts for common project types and sizes, with a spares allowance for setting failures.

How It Works

  • Each project type has a baseline hardware set drawn from typical construction: stress points, strap anchors and closures.
  • Counts scale with the main dimension, because longer straps and taller bags need more anchor points.
  • Belt eyelets scale with belt length rather than overall size.
  • A spares allowance covers rivets that set crooked, which is a normal loss in hand work.
strap anchor:  [o]===strap===[o]   2 rivets per end
bag:  4 anchors x 2 rivets = 8 rivets
Schematic diagram of the calculation.

How to Use

  1. 1Pick the closest project type — the counts are baselines, not rules.
  2. 2Enter the main dimension: belt length, bag height or wallet width.
  3. 3Order the highlighted quantities, rounding up to the pack size your supplier sells.

FAQ

How many rivets does a strap need?

Two per attachment point. One rivet allows the strap to pivot and eventually tear.

Rivets or stitching?

Rivets resist shear better, stitching resists peel better. Heavy straps deserve both.

What size magnetic snap?

14 mm for wallets and small pouches, 18 mm for bag flaps.

Why so many spares?

Setting failures run 10-20% for hand-set rivets, especially with cheap tools.

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