acalculator

What is my club’s swing weight?

Type a golf club's total weight and the distance from the grip end to its balance point. The swing weight calculator gives the moment in inch-ounces and the swing weight from A0 to G9, such as D2. Add a target swing weight and the club length to see how many grams to add at the head, or take off.

Your numbers

Units
Swing weight
D1

A club of 11 oz balancing at 33.5 in has a swing weight of D1.

Moment (inch-ounces)
214.5
Points above A0
30.57
Swing weight to a tenth
D0.6
Head weight change (oz)
0.079
Head weight change (g)
2.25
To reach the target
Add 2.25 g at the head to reach D2

Swing weight: D1. A club of 11 oz balancing at 33.5 in has a swing weight of D1.

How to calculate

Works out a golf club’s swing weight on the Lorythmic scale (A0 to G9) from its weight and balance point, and the head weight to add or remove to reach a target swing weight.

Example with the default inputs (Club weight 11 oz, Balance point 33.5 in, Target swing weight D2, Club length 45.5 in): A club of 11 oz balancing at 33.5 in has a swing weight of D1.

Method: Moment = club weight (oz) × (balance point (in) − 14); points = (moment − 161) ÷ 1.75, where 0 is A0, 10 is B0, 20 is C0, 30 is D0; head change = (target points − points) × 1.75 ÷ (club length − 14).

  • The Lorythmic scale: a fulcrum 14 inches from the grip end, C0 = 196 inch-ounces and 1.75 inch-ounces a point.
  • The swing weight shown is the nearest whole point; halves round up.
  • Added head weight sits at the club length from the grip end.

Machine-readable copies: Markdown, JSON.

Worked examples

Each example is checked against the calculator on every build.

  1. Club weight 12 oz, Balance point 32 in gives Moment (inch-ounces) 216, Points above A0 31.428571, Swing weight D1, Swing weight to a tenth D1.4.Source: Dave Tutelman, Design Notes, Heft: swingweight and MOI, page 4 (swingweight = club weight × (balance point − 14 in); C-0 = 196.00 in-oz, D-0 = 213.50 in-oz, 1.75 in-oz a point), https://www.tutelman.com/golf/design/swingwt4.php (retrieved 2026-10-02)
  2. Club weight 14.5 oz, Balance point 27.5 in gives Moment (inch-ounces) 195.75, Points above A0 19.857143, Swing weight C0, Swing weight to a tenth B9.9.Source: Dave Tutelman, Design Notes, Heft: swingweight and MOI, page 4 (swingweight = club weight × (balance point − 14 in); C-0 = 196.00 in-oz, D-0 = 213.50 in-oz, 1.75 in-oz a point), https://www.tutelman.com/golf/design/swingwt4.php (retrieved 2026-10-02)
  3. Club weight 12 oz, Balance point 32 in, Target swing weight D3, Club length 45 in gives Head weight change (oz) 0.08871, Head weight change (g) 2.514877.Source: Dave Tutelman, Design Notes, Heft: swingweight and MOI, page 4 (swingweight = club weight × (balance point − 14 in); C-0 = 196.00 in-oz, D-0 = 213.50 in-oz, 1.75 in-oz a point), https://www.tutelman.com/golf/design/swingwt4.php (retrieved 2026-10-02)
  4. Club weight 10.58 oz, Balance point 31.5 in gives Moment (inch-ounces) 185.146638, Points above A0 13.798079, Swing weight B4, Swing weight to a tenth B3.8.Source: Dave Tutelman, Design Notes, Heft: swingweight and MOI, page 4 (swingweight = club weight × (balance point − 14 in); C-0 = 196.00 in-oz, D-0 = 213.50 in-oz, 1.75 in-oz a point), https://www.tutelman.com/golf/design/swingwt4.php (retrieved 2026-10-02)

How it works

The Lorythmic scale measures a club's balance about a fulcrum 14 inches from the grip end.

  1. Convert the club weight W to ounces (1 oz = 28.349523125 g) and the balance point B to inches (1 in = 2.54 cm).
  2. Moment M = W × (B − 14), in inch-ounces.
  3. Points P = (M − 161) ÷ 1.75. C0 is 196 inch-ounces, and each point is 1.75 inch-ounces, so A0 = 196 − 20 × 1.75 = 161. Point 0 is A0, 10 is B0, 20 is C0, 30 is D0, 40 is E0, 50 is F0, 60 is G0, 69 is G9.
  4. Swing weight: round P to the nearest whole number, halves up. The letter is A to G for (rounded P) ÷ 10 (whole part), and the digit is the remainder. A rounded P below 0 shows "Below A0"; above 69 shows "Above G9".
  5. To a tenth: round 10 × P to a whole number, halves up, and write it as the letter and the remainder ÷ 10 (D1.4). Outside the scale it shows the same note as step 4.

Target swing weight. Type a letter A to G and a digit 0 to 9 (D2; lower case and a space between are accepted) and the club length L from the grip end. Weight added at the head sits L inches from the grip end, so it changes the moment by its weight × (L − 14). The change to reach target point T is:

  • head weight (oz) = (T − P) × 1.75 ÷ (L − 14), and in grams × 28.349523125
  • a positive change is weight to add; a negative one, weight to remove.

Rules

  • The club weight is above 0 and at most 10 kg; the balance point and club length are above 0 and at most 5 m.
  • The balance point must be more than 14 inches (35.56 cm) from the grip end; otherwise there is no answer.
  • With a target, the club length must be given and must be more than the balance point.
  • Typed values are read as the exact decimals you typed in the unit you chose, so a point that is exactly half rounds up.

Output format. The moment and points have 2 decimals; the head change has 3 decimals in ounces and 2 in grams. "To reach the target" reads "Add 2.51 g at the head to reach D3" or "Remove …", with grams rounded to 2 decimals (halves away from zero), or "The club is already D3" when the change is 0.

Worked examples by hand

A 12 oz club balancing at 32 inches. M = 12 × (32 − 14) = 216 in-oz. P = (216 − 161) ÷ 1.75 = 31.43, which rounds to 31: D1 (D1.4 to a tenth).

Make it D3 with a 45-inch length. T = 33. Change = (33 − 31.4286) × 1.75 ÷ (45 − 14) = 2.75 ÷ 31 = 0.0887 oz = 2.51 g to add.

A 14.5 oz wedge balancing at 27.5 inches. M = 14.5 × 13.5 = 195.75 in-oz, a quarter below C0. P = 34.75 ÷ 1.75 = 19.86, which rounds to 20: C0 (B9.9 to a tenth).

A 300 g club balancing at 80 cm. 300 g = 10.5822 oz and 80 cm = 31.4961 in. M = 10.5822 × 17.4961 = 185.15 in-oz. P = 24.15 ÷ 1.75 = 13.80, which rounds to 14: B4 (B3.8).

Other questions people ask

What is swing weight?

Swing weight is how heavy a golf club feels when you swing it, measured as the club's balance about a point 14 inches from the grip end. Two clubs of the same total weight can have different swing weights: the one with more weight toward the head feels heavier.

How is swing weight calculated?

Multiply the club's total weight in ounces by its balance point in inches minus 14. That moment, in inch-ounces, is read on the Lorythmic scale: C0 is 196 inch-ounces and each point is 1.75 inch-ounces, so D0 is 213.5. A 12 oz club balancing at 32 inches has 12 × 18 = 216 inch-ounces, which is D1.

What do the letters and numbers mean?

The scale runs A0, A1 … A9, B0 … G9, 70 points in all, each 1.75 inch-ounces heavier than the one before. A0 is 161 inch-ounces and G9 is 281.75. The letter and digit are only a name for the moment: D2 is 217 inch-ounces, and anything from 216.125 up to (not including) 217.875 rounds to D2.

How much head weight changes swing weight by one point?

One point is 1.75 inch-ounces. A weight at the head of a 45-inch driver sits 31 inches past the fulcrum, so one point is 1.75 ÷ 31 = 0.056 oz, about 1.6 g. On a shorter iron the head is closer to the fulcrum, so each point takes a little more weight.

How do I find the balance point?

Lay the club across a thin edge, such as a ruler on its side, and slide it until it balances. Measure from the end of the grip to that point. Use the whole club as you play it: grip, shaft and head.

Does a heavier grip lower swing weight?

Yes. A heavier grip moves the balance point toward the grip end, which lowers the moment about the 14-inch fulcrum even though the club is heavier overall. Weigh the club and find the balance point again after a grip change, then recalculate.