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Lead Tape Calculator
Current club, tape mass, tape location. Instant modelled delta — then park the same weight on the Club Bench.
Baseline MODELLED D1.4 → D3.2 (+1.81 points). Same physics engine as the Lab — not a 2g ≈ 1 point shortcut.
Lead tape is not a constant
Forum memory says two grams of lead tape equals one swingweight point. That is a decent head-only mnemonic for a mid-iron because the head sits roughly two feet past a 14-inch fulcrum. Move the same two grams to the shaft midspan and you bought less torque. Park it under the grip and you may lower swingweight. A lead tape calculator that ignores location is a slogan generator.
This page places a modelled mass at head, shaft, or butt stations on a generic 7-iron chassis and re-runs the shared physics engine. The Lab lets you drag +2 / +4 / +6 g (or custom) to an exact inch from the butt, including tungsten tape stacked on the hosel or a tip weight in the bore.
Workshop practice
Clean the head, weigh the tape, note whether you wrapped toward the toe or the hosel — those change feel more than they change first moment about the shaft axis, but the axial station still matters for swingweight. Re-weigh the finished club and take a new balance point. That MEASURED pair is the truth; the tape model is the plan.
If you are matching a set, do not chase a celebrity’s D4. Chart your own 4-iron through PW and see whether the taped club is the outlier. The set matcher exists for that loop.
FAQ
Does tungsten tape calculate differently than lead?
Mass is mass for first moment. Density only changes how small the strip is. Enter grams and location.
Can I put tape on the shaft?
Yes. Choose shaft, then refine the station in the Lab by dragging the marker.
Will tape fall off in the rain?
That is a materials question, not a moment question. Finish and re-measure the club.
Need the full bench? Open Club Builder Lab