#sw-calculator-container h2 { color: #1a5632; margin-top: 0; font-size: 28px; border-bottom: 2px solid #1a5632; padding-bottom: 10px; }
.sw-input-group { margin-bottom: 20px; }
.sw-input-group label { display: block; font-weight: 700; margin-bottom: 8px; font-size: 16px; color: #444; }
.sw-input-group input { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 6px; box-sizing: border-box; font-size: 16px; transition: border-color 0.3s; }
.sw-input-group input:focus { border-color: #1a5632; outline: none; box-shadow: 0 0 5px rgba(26,86,50,0.2); }
.sw-btn { background-color: #1a5632; color: white; padding: 15px 25px; border: none; border-radius: 6px; cursor: pointer; font-size: 18px; font-weight: bold; width: 100%; transition: background 0.3s; }
.sw-btn:hover { background-color: #134125; }
#sw-result-box { margin-top: 25px; padding: 20px; border-radius: 8px; background-color: #fff; border-left: 5px solid #1a5632; display: none; }
.sw-result-val { font-size: 32px; font-weight: 800; color: #1a5632; margin: 10px 0; }
.sw-info-text { font-size: 14px; color: #666; line-height: 1.5; }
.sw-table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.sw-table th, .sw-table td { border: 1px solid #ddd; padding: 12px; text-align: left; }
.sw-table th { background-color: #1a5632; color: white; }
.sw-table tr:nth-child(even) { background-color: #f2f2f2; }
.sw-help-card { background: #eef7f2; padding: 15px; border-radius: 8px; margin-top: 20px; font-size: 14px; }
function calculateGolfSwingWeight() {
var weightGrams = parseFloat(document.getElementById('clubWeight').value);
var balanceInches = parseFloat(document.getElementById('balancePoint').value);
var resultBox = document.getElementById('sw-result-box');
var displayVal = document.getElementById('sw-display-val');
var description = document.getElementById('sw-description');
if (!weightGrams || !balanceInches || weightGrams <= 0 || balanceInches <= 14) {
alert("Please enter valid positive numbers. Note: The balance point must be greater than 14 inches from the butt end.");
return;
}
// Convert grams to ounces
var weightOz = weightGrams / 28.3495231;
// Torque = Weight (oz) * (Balance Point (in) – 14)
var torque = weightOz * (balanceInches – 14);
// Reference point: D0 is widely accepted as 213.5 oz-in
// Each swingweight point is 1.75 oz-in
var pointsFromD0 = (torque – 213.5) / 1.75;
// Calculate total points from A0
// A0 is 30 points below D0 (A-B-C-D)
var totalPoints = pointsFromD0 + 30;
var letters = ["A", "B", "C", "D", "E", "F", "G"];
var letterIdx = Math.floor(totalPoints / 10);
var numVal = Math.round((totalPoints % 10) * 10) / 10;
// Edge cases for scale
if (letterIdx = letters.length) {
displayVal.innerHTML = "G+";
description.innerHTML = "This club is exceptionally heavy (G scale or higher), often seen only in training aids.";
} else {
var finalLetter = letters[letterIdx];
var finalNumber = Math.floor(numVal);
// Handle rounding up to next letter (e.g. C10 becomes D0)
if (finalNumber >= 10) {
finalLetter = letters[letterIdx + 1];
finalNumber = 0;
}
var swOutput = finalLetter + finalNumber;
displayVal.innerHTML = swOutput;
// Provide context
var context = "";
if (finalLetter === 'A' || finalLetter === 'B') {
context = "Ultra-light. Common in junior clubs or very light ladies' clubs.";
} else if (finalLetter === 'C') {
context = "Lightweight. Standard for many women's sets and some senior graphite irons.";
} else if (finalLetter === 'D' && finalNumber 4) {
context = "Heavy side of standard. Preferred by players with higher swing speeds for better head awareness.";
} else {
context = "Very Heavy. This is typically found in specialized wedges or clubs with heavy aftermarket shafts.";
}
description.innerHTML = context + " (Calculated torque: " + torque.toFixed(2) + " oz-in).";
}
resultBox.style.display = 'block';
resultBox.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}
Golf Swingweight Calculator
*Measure from the very end of the grip cap to where the club balances perfectly on a finger or edge.
Estimated Swingweight:
—
How to Measure:
1. Find the total weight of your club in grams using a digital scale.
2. Find the balance point by balancing the club on a thin edge (like a ruler). Measure the distance from the top of the grip (butt end) to that balance point in inches.
Understanding Golf Swingweight
Swingweight is a measure of how the weight of the club feels during the swing. It is not the total weight of the club, but rather the relationship between the weight and the balance point. Two clubs can have the same total weight but feel completely different because one has more weight concentrated in the head (a "heavier" swingweight).
The Lorythmic Scale (A0 – G10)
Swingweight is measured on a scale consisting of a letter (A, B, C, D, E, F, G) and a number (0 through 9). Most standard men's clubs fall into the D0 to D4 range, while women's clubs typically fall into the C5 to C9 range.
| Category | Typical Range | Feel Description |
|---|---|---|
| Ladies Standards | C4 – C7 | Very light head feel, easier to swing for slower speeds. |
| Men's Light/Senior | C8 – D0 | Lightweight feel, common in graphite shafted irons. |
| Men's Standard | D1 – D3 | The industry standard for most amateurs and pros. |
| Heavy/Tour Pro | D4 – D6+ | Noticeable head "heaviness," preferred for high tempo swings. |
Why Swingweight Matters
Consistency is the primary reason to check your swingweight. If your 7-iron is a D2 and your 8-iron is a C9, you will likely struggle with timing and strike consistency between those two clubs. Club builders use lead tape, tip weights, or lighter grips to fine-tune these measurements so every club in the bag feels uniform.
Factors That Change Swingweight
- Club Head Weight: Adding 2 grams to the head increases swingweight by 1 point (e.g., D2 to D3).
- Shaft Length: Adding 1/2 inch of length increases swingweight by roughly 3 points.
- Grip Weight: Adding 4-5 grams to the grip end decreases swingweight by 1 point (counter-balancing).
- Shaft Weight: A heavier shaft generally increases swingweight, assuming the balance point of the shaft remains the same.
Technical Formula Used
This calculator utilizes the standard 14-inch fulcrum formula (Lorythmic Scale). The physics behind it involves calculating the torque in ounce-inches relative to a pivot point 14 inches from the butt end of the club. 1 Swingweight point equals approximately 1.75 ounce-inches of torque.