Suit Size Calculator

Suit Size Calculator

Use this calculator to estimate your suit jacket and trouser sizes based on your body measurements. Remember that these are estimates, and trying on suits is always recommended for the best fit.

Inches / Feet Centimeters

function calculateSuitSize() { var chest = parseFloat(document.getElementById('chestMeasurement').value); var waist = parseFloat(document.getElementById('waistMeasurement').value); var height = parseFloat(document.getElementById('heightMeasurement').value); var unit = document.getElementById('unitSelect').value; var jacketSizeResult = document.getElementById('jacketSizeResult'); var trouserWaistResult = document.getElementById('trouserWaistResult'); var notesResult = document.getElementById('notesResult'); jacketSizeResult.innerHTML = "; trouserWaistResult.innerHTML = "; notesResult.innerHTML = "; // Input validation if (isNaN(chest) || chest <= 0 || isNaN(waist) || waist <= 0 || isNaN(height) || height <= 0) { notesResult.innerHTML = 'Please enter valid positive numbers for all measurements.'; return; } var chestInches, waistInches, heightInches; // Convert all measurements to inches for internal calculation if (unit === 'cm') { chestInches = chest / 2.54; waistInches = waist / 2.54; heightInches = height / 2.54; } else { // Assume 'inches' chestInches = chest; waistInches = waist; heightInches = height; } // Calculate Jacket Size (based on chest, rounded to nearest even number) var jacketSize = Math.round(chestInches / 2) * 2; if (jacketSize 60) jacketSize = 60; // Maximum common adult size // Determine Jacket Length (S, R, L) based on height var jacketLength = "; if (heightInches = 67 && heightInches <= 72) { // 5'7" to 6'0" (approx. 170.18 cm to 182.88 cm) jacketLength = 'R'; } else { // Over 6'0" (approx. 182.88 cm) jacketLength = 'L'; } // Calculate Trouser Waist Size (based on waist, rounded to nearest whole number) var trouserWaist = Math.round(waistInches); if (trouserWaist 54) trouserWaist = 54; // Maximum common adult size // Display results jacketSizeResult.innerHTML = 'Jacket Size: ' + jacketSize + jacketLength; trouserWaistResult.innerHTML = 'Trouser Waist: ' + trouserWaist + ' inches'; notesResult.innerHTML = 'Please note: These are estimated sizes. Suit fit can vary by brand and style. Always try on a suit and consider professional tailoring for the best fit.'; }

Understanding Suit Sizing

Finding the perfect suit can transform your appearance, but it all starts with understanding your size. Unlike casual wear, suits require precise measurements to achieve that sharp, tailored look. This guide will help you demystify suit sizing.

Key Measurements for Suit Sizing

To use the calculator effectively and understand your suit size, you'll need three primary measurements:

1. Chest Circumference: Measure around the fullest part of your chest, just under your armpits, keeping the tape measure level. This measurement directly correlates to your jacket size.
2. Waist Circumference: Measure around your natural waistline, typically just above your navel. This is where your trousers will sit.
3. Height: Your total height helps determine the jacket length (Short, Regular, or Long).

For accuracy, wear a thin shirt when measuring and ensure the tape measure is snug but not tight.

Jacket Sizing: The Number and the Letter

A suit jacket size is typically represented by a number followed by a letter, for example, "40R".

• The Number (e.g., 40): This corresponds to your chest measurement in inches. If your chest is 40 inches, your jacket size will likely be 40. Suit sizes are almost always even numbers.
• The Letter (S, R, L): This indicates the jacket's length, which is determined by your height:
  • S (Short): Generally for men under 5'7″ (170 cm).
  • R (Regular): For men between 5'7″ (170 cm) and 6'0″ (183 cm).
  • L (Long): For men over 6'0″ (183 cm).

Trouser Sizing

Suit trousers are usually sized by their waist measurement in inches. While many suits are sold as "drops" (e.g., a 40R jacket often comes with 34-inch waist trousers, a 6-inch drop), it's increasingly common to buy separates. Your measured waist circumference will be your trouser size.

The Importance of Fit and Tailoring

While this calculator provides a great starting point, remember that suit fit can vary significantly between brands and styles (e.g., slim fit, classic fit, athletic fit). The most crucial step after determining your size is to try on the suit. Pay attention to:

• Shoulders: The shoulder seams should align perfectly with your natural shoulder line.
• Jacket Length: The jacket hem should cover your backside and end around the middle of your thumb when your arms are relaxed.
• Sleeve Length: The jacket sleeve should end just above your wrist bone, allowing about half an inch of your shirt cuff to show.
• Trouser Break: Trousers should have a slight "break" (a small fold) where they meet your shoes, or no break for a more modern look.

Almost every off-the-rack suit will benefit from professional tailoring. A good tailor can adjust sleeve length, trouser length, and even the jacket's waist to give you a custom-fitted appearance that makes all the difference.

Example Calculation:

Let's say you measure:

• Chest: 40.5 inches
• Waist: 34 inches
• Height: 5 feet 10 inches (which is 70 inches total)

Based on these measurements, the calculator would suggest:

• Jacket Size: 40R (40.5 inches chest rounds to a 40 jacket size, and 70 inches height falls into the Regular length range)
• Trouser Waist: 34 inches

This gives you a solid starting point for trying on suits.