How do you calculate suit jacket size?

Measure chest at the fullest point (under arms), round to the nearest even inch for the jacket number, then add a length letter from height. This tool: chest 40" → even 40, height 70" → R (Regular (5′8″–6′0″)), classic fit adjustment 0″ → jacket 40R. Formula: Jacket = round_even(chest 40.0″) 40 + fit (0) → 40R; Pants = 34×32; Shirt = 16/34; Drop = 6" Slim fit subtracts 2″ from the jacket number (38R on the same measurements).

What does 40R mean in suit sizes?

40R = 40″ chest jacket block + Regular length (about 5′8″–6′0″ in this chart). Other letters: S (under 5′8″), L (6′0″–6′3″), XL (6′3″+). Your default result here is 40R with EU approximate 50. Tall lean example (6′2″, 38″ chest, slim): 36L. Short example (5′6″): 38S.

How do I find my suit pant size?

Off-the-rack pants are labeled waist × inseam in inches. Enter measured waist at the navel and inseam crotch-to-floor with dress shoes. Default: 34 × 32 (waist 34", inseam 32"). Jacket size does not change pant waist — check drop: jacket chest number minus pant waist = 6″ (Standard (6″ drop)). Athletic build (44″ chest, 34″ waist): 10″ drop → often needs athletic separates or waist tailoring.

What is suit drop and why does it matter?

Drop = jacket size number minus pant waist (approximate). Standard ready-to-wear is ~6″ (40 jacket with 34 waist = 6″ here). Athletic builds often 8–10″ (10″ in our 44/34 scenario). Portly builds 2–5″ (4″ on 44R jacket with 40 waist). If drop is far from 6″, buy separates or plan waist alterations ($20–75).

What is the difference between slim fit and classic fit suits?

Classic uses your even chest measurement (40R). Slim subtracts 2″ from the jacket number → 38R (tighter chest block; same 34 × 32 pants unless you size waist separately). Relaxed adds +2″ → 44R on the portly scenario. Slim does not automatically fix a large drop — athletic slim may still need a larger jacket size with waist taken in.

How should a suit jacket fit?

Priority order: (1) Shoulder seam at shoulder bone — poor shoulder fit cannot be fixed cheaply. (2) Buttoned chest — fist between body and fabric without pulling. (3) Sleeve shows ¼–½″ shirt cuff (shirt 16/34 here). (4) Length covers seat, front hem near mid-thumb. For sleeve 34" on a 40R jacket, budget ~$20–35 sleeve shortening if RTW is long.

What dress shirt size goes with my suit?

Dress shirts use neck × sleeve (e.g. 16/34 = 16" neck, 34" sleeve). Neck is rounded to nearest ½″. Shirt size is independent of jacket number — a 40R jacket often pairs with 15.5–16.5 neck depending on neck measurement, not chest.

How do suit sizes vary by brand?

This page’s brand guide for your build: Brooks Brothers 40R/34 × 32; Hugo Boss (slim-leaning) 40R; EU rough EU 50. Italian/EU lines often run slimmer — try one size up if between sizes. Always check the brand’s chart; Ludlow vs Crosby at J.Crew fits differently even at the same label size.

Should I size up or down for a wedding suit?

Size to current measurements, not future weight loss. Between sizes: size up if shoulders are broad or you layer; size down only if you want a fashion-forward slim look and accept less room. Default 40R is a safe classic starting point. Book tailoring 2–4 weeks before the event — hems ($15–30) and waist ($20–40) are routine; shoulder work is expensive ($50–100+).

How much do suit alterations cost?

Typical ranges: hem pants $15–30, shorten jacket sleeves $20–35, take in waist $20–40, jacket body $40–75, shoulders $50–100+ (difficult). This build lists: Minor tweaks only — hem or sleeve if off-the-rack is close. Budget 10–20% of suit price for RTW tailoring. Many retailers include basic hems with purchase.

How do I measure myself for a suit?

Use a soft tape, stand naturally, breathe normally. Chest: fullest part under arms. Waist: at navel where pants sit. Sleeve: shoulder to wrist with elbow bent ~90°. Neck: where collar sits. Inseam: crotch to floor with shoes. Height: barefoot. Default imperial inputs (40 chest, 34 waist, 70″ height) produce Jacket 40R · Pants 34 × 32 · Shirt 16/34 · EU ~50 · Standard (6″ drop). Metric mode converts cm to inches internally.

Are online suit size calculators accurate?

They give a starting label for shopping — not a replacement for try-on. Shoulders, posture, and brand blocks vary. Use this calculator to compare slim vs classic (40R vs 38R) and check drop before buying a set. Confirm final fit with a tailor, especially for weddings or bespoke budgets.

theCalcs

Get Custom Solution

Loading calculators...

Q: What size suit am I with a 40 inch chest?

Enter chest, waist, height, sleeve, neck, and inseam. With default 40″ chest, 34″ waist, 70″ height (5′10″), classic fit, this tool suggests jacket 40R, pants 34 × 32, shirt 16/34, 6″ drop (Standard (6″ drop)), EU jacket ~50. Slim fit on the same measurements → 38R. Shoulders and brand blocks still require try-on — use as a shopping label, not a tailor’s pattern.

Fetching calculator categories and tools for this section.

Go to Calculators Browse Calculators

Loading the page...

Preparing tools and content for you. This usually takes a second.

Go Home Browse Calculators

theCalcs

Get Custom Solution

Menswear · sizing

Suit Size Calculator

Quick answer — what size suit am I?

Demo (40″ chest, 34″ waist, 5′10″, classic): jacket 40R, pants 34 × 32, shirt 16/34, 6″ drop (Standard (6″ drop)), EU ~50. Slim fit → 38R on same measurements. Jacket # ≈ even chest; length S/R/L/XL from height; pants = waist × inseam.

40R = 40″ chest block + Regular length (~5′8″–6′0″ in this chart).
Standard off-the-rack drop is often ~6″ (jacket number minus pant waist).
Shoulder fit matters most — prioritize shoulders over chest ease when trying on.
Last reviewed October 9, 2026 — always check brand size charts before buying.

Default: jacket 40R · pants 34 × 32 · shirt 16/34

6″ drop (Standard (6″ drop)) · EU jacket ~50

Slim vs classic: 38R vs 40R · athletic 44L

Need dress shoe sizing? Shoe size converter

Suit Size Calculator

Jacket, pant, and dress shirt sizes from your measurements

Unit System

Fit Preference

Body measurements

Height (in)

Weight (lbs)

Chest (in)

Fullest part of chest, under arms

Waist (in)

Sleeve (in)

Neck (in)

Inseam (in)

Your suit sizes

Fit style

Classic fit — traditional room

Jacket = round_even(chest 40.0″) 40 + fit (0) → 40R; Pants = 34×32; Shirt = 16/34; Drop = 6"

Jacket

40R

EU ~50

Pants

34 × 32

Shirt

16/34

Drop

Standard (6″ drop)

Brand guide

Brooks Brothers (US)40R / 34 × 32

Classic American block; check Madison vs Fitzgerald lines

Hugo Boss (EU lean)40R / 34 × 32

Often runs slim — try one size up if between sizes

J.Crew Ludlow40R / 34 × 32

Slim-leaning Ludlow vs roomier Crosby

EU approximateEU 50 / 34 × 32

Rough US+10 EU jacket (e.g. 40R → EU 50)

Recommendations

• Standard 6" drop — most 6″-drop suit sets align well
• Try on with dress shoes for pant break; shoulders must fit before other alterations

Likely alterations

• Minor tweaks only — hem or sleeve if off-the-rack is close

• Shoulder seam should end at your shoulder bone — avoid “riding up” or overhang
• Buttoned jacket: fist should fit between sternum and fabric without pulling
• Jacket back length: covers seat; front hem hits mid-thumb with arms at sides
• Shirt cuff: ¼–½″ visible below jacket sleeve

Default snapshot (5′10″ · 40″ chest · classic fit)

Jacket

40R

Regular (5′8″–6′0″)

Pants

34 × 32

Shirt

16/34

Drop

6″

Standard (6″ drop)

Sizing method

Jacket number = round chest to nearest even inch + fit adjustment (−2 slim / 0 classic / +2 relaxed)
Length letter (S/R/L/XL) from total height in inches
Pants = rounded waist × rounded inseam (US labeling)
Dress shirt = neck (½″ steps) / sleeve length
Drop ≈ jacket chest number − pant waist (standard RTW often ~6″)

Jacket = round_even(chest 40.0″) 40 + fit (0) → 40R; Pants = 34×32; Shirt = 16/34; Drop = 6"

Jacket length by height

Code	Height (imperial)	Use when
S	Short (under 5′8″)	Under 68.99″
R	Regular (5′8″–6′0″)	68″–71.99″
L	Long (6′0″–6′3″)	72″–74.99″
XL	Extra long (6′3″+)	75″–∞

Fit preference adjustments

slim fit

-2″ on jacket number

Slim fit — modern, closer to body

classic fit

0″ on jacket number

Classic fit — traditional room

relaxed fit

+2″ on jacket number

Relaxed fit — extra ease

Suit drop guide

6″ (standard) — chest−waist 6–7″: Typical off-the-rack suit sets
7–8″ (athletic) — chest−waist 8–10″: Broader chest vs waist — athletic cuts
3–4″ (portly) — chest−waist 2–5″: Larger midsection — consider portly/comfort fit

Suit size scenarios (calculator output)

Scenario	Measurements	Jacket	Pants	Shirt	Drop	EU ~
Default — 5′10″ classic fit	40″ chest · 34″ waist · 70″ height	40R	34 × 32	16/34	6″ (Standard (6″ drop))	50
Slim fit (same measurements)	Jacket −2″ vs classic	38R	34 × 32	16/34	4″ (Portly / comfort (small drop))	48
Athletic drop	44″ chest · 34″ waist (10″ drop)	44L	34 × 32	16.5/35	10″ (Athletic (large drop))	54
Tall & lean	6′2″ · 38″ chest	36L	32 × 34	15.5/35	4″ (Portly / comfort (small drop))	46
Short stature	5′6″ · 38″ chest	38S	32 × 30	15.5/32	6″ (Standard (6″ drop))	48
Relaxed / portly	42″ chest · 40″ waist	44R	40 × 30	17/33	4″ (Portly / comfort (small drop))	54

Worked sizing scenarios

Default — 5′10″ classic fit

40″ chest · 34″ waist · 70″ height

40R · 34 × 32 · shirt 16/34

Drop 6″ · Standard (6″ drop)

Jacket 40R · Pants 34 × 32 · Shirt 16/34 · EU ~50 · Standard (6″ drop)

Slim fit (same measurements)

Jacket −2″ vs classic

38R · 34 × 32 · shirt 16/34

Drop 4″ · Portly / comfort (small drop)

Jacket 38R · Pants 34 × 32 · Shirt 16/34 · EU ~48 · Portly / comfort (small drop)

Athletic drop

44″ chest · 34″ waist (10″ drop)

44L · 34 × 32 · shirt 16.5/35

Drop 10″ · Athletic (large drop)

Jacket 44L · Pants 34 × 32 · Shirt 16.5/35 · EU ~54 · Athletic (large drop)

Tall & lean

6′2″ · 38″ chest

36L · 32 × 34 · shirt 15.5/35

Drop 4″ · Portly / comfort (small drop)

Jacket 36L · Pants 32 × 34 · Shirt 15.5/35 · EU ~46 · Portly / comfort (small drop)

Short stature

5′6″ · 38″ chest

38S · 32 × 30 · shirt 15.5/32

Drop 6″ · Standard (6″ drop)

Jacket 38S · Pants 32 × 30 · Shirt 15.5/32 · EU ~48 · Standard (6″ drop)

Relaxed / portly

42″ chest · 40″ waist

44R · 40 × 30 · shirt 17/33

Drop 4″ · Portly / comfort (small drop)

Jacket 44R · Pants 40 × 30 · Shirt 17/33 · EU ~54 · Portly / comfort (small drop)

Step-by-step: default measurements

Chest 40″ → even size 40
Height 70″ (5′10″) → Regular → R
Classic fit → jacket 40R
Waist 34″ × inseam 32″ → pants 34 × 32
Neck 16″ / sleeve 34″ → shirt 16/34
Drop 6″ — Standard (6″ drop)

Limitations

Sizing varies by brand, country (US/UK/EU), and line (slim vs classic vs athletic)
Jacket number approximates chest in inches (even sizes) — not the same as shirt size or EU label
Shoulder fit is the hardest to alter — prioritize shoulder alignment when trying on
Women's and non-binary tailoring use different systems — this tool targets men's RTW conventions
In-store fitting and a tailor still beat any online estimate for wedding or bespoke purchases

Sources & references

Brooks Brothers — Suit fit guideClassic American sizing and fit terminology
Men's Wearhouse — Measurement tipsRetail measurement standards for off-the-rack suits
GQ — How a suit should fitShoulder, sleeve, and break reference points

Frequently Asked Questions

Found this helpful?

Share with anyone shopping for a wedding or interview suit.

Share This Calculator

Help others discover this useful tool

Copy Link

Share on Social Media

X Facebook LinkedIn WhatsApp

Share via Email

Suggested hashtags: #SuitSize #Menswear #Wedding #StyleGuide #Calculator

Related Calculators

Shoe Size Converter

US, UK, EU shoe sizes for dress shoes with your suit.

Use Calculator

BMI Calculator

Body mass context while tracking weight before tailoring.

Use Calculator

Body Type Calculator

Frame and proportion insights for fit choices.

Use Calculator

Wrist Size & Frame Type

Small vs large frame reference measurements.

Use Calculator

Compression Garment Size

Sized athletic wear and undergarment fit.

Use Calculator

Body Recomposition Calculator

Macro targets if you are cutting before an event fitting.

Use Calculator

theCalcs

Get Custom Solution

Loading calculators...

Fetching calculator categories and tools for this section.

Go to Calculators Browse Calculators

theCalcs

Get Custom Solution

Menswear · sizing

Suit Size Calculator

Quick answer — what size suit am I?

40R = 40″ chest block + Regular length (~5′8″–6′0″ in this chart).
Standard off-the-rack drop is often ~6″ (jacket number minus pant waist).
Shoulder fit matters most — prioritize shoulders over chest ease when trying on.
Last reviewed October 9, 2026 — always check brand size charts before buying.

Default: jacket 40R · pants 34 × 32 · shirt 16/34

6″ drop (Standard (6″ drop)) · EU jacket ~50

Slim vs classic: 38R vs 40R · athletic 44L

Need dress shoe sizing? Shoe size converter

Suit Size Calculator

Jacket, pant, and dress shirt sizes from your measurements

Unit System

Fit Preference

Body measurements

Height (in)

Weight (lbs)

Chest (in)

Fullest part of chest, under arms

Waist (in)

Sleeve (in)

Neck (in)

Inseam (in)

Your suit sizes

Fit style

Classic fit — traditional room

Jacket = round_even(chest 40.0″) 40 + fit (0) → 40R; Pants = 34×32; Shirt = 16/34; Drop = 6"

Jacket

40R

EU ~50

Pants

34 × 32

Shirt

16/34

Drop

Standard (6″ drop)

Brand guide

Brooks Brothers (US)40R / 34 × 32

Classic American block; check Madison vs Fitzgerald lines

Hugo Boss (EU lean)40R / 34 × 32

Often runs slim — try one size up if between sizes

J.Crew Ludlow40R / 34 × 32

Slim-leaning Ludlow vs roomier Crosby

EU approximateEU 50 / 34 × 32

Rough US+10 EU jacket (e.g. 40R → EU 50)

Recommendations

• Standard 6" drop — most 6″-drop suit sets align well
• Try on with dress shoes for pant break; shoulders must fit before other alterations

Likely alterations

• Minor tweaks only — hem or sleeve if off-the-rack is close

• Shoulder seam should end at your shoulder bone — avoid “riding up” or overhang
• Buttoned jacket: fist should fit between sternum and fabric without pulling
• Jacket back length: covers seat; front hem hits mid-thumb with arms at sides
• Shirt cuff: ¼–½″ visible below jacket sleeve

Default snapshot (5′10″ · 40″ chest · classic fit)

Jacket

40R

Regular (5′8″–6′0″)

Pants

34 × 32

Shirt

16/34

Drop

6″

Standard (6″ drop)

Sizing method

Jacket number = round chest to nearest even inch + fit adjustment (−2 slim / 0 classic / +2 relaxed)
Length letter (S/R/L/XL) from total height in inches
Pants = rounded waist × rounded inseam (US labeling)
Dress shirt = neck (½″ steps) / sleeve length
Drop ≈ jacket chest number − pant waist (standard RTW often ~6″)

Jacket = round_even(chest 40.0″) 40 + fit (0) → 40R; Pants = 34×32; Shirt = 16/34; Drop = 6"

Jacket length by height

Code	Height (imperial)	Use when
S	Short (under 5′8″)	Under 68.99″
R	Regular (5′8″–6′0″)	68″–71.99″
L	Long (6′0″–6′3″)	72″–74.99″
XL	Extra long (6′3″+)	75″–∞

Fit preference adjustments

slim fit

-2″ on jacket number

Slim fit — modern, closer to body

classic fit

0″ on jacket number

Classic fit — traditional room

relaxed fit

+2″ on jacket number

Relaxed fit — extra ease

Suit drop guide

6″ (standard) — chest−waist 6–7″: Typical off-the-rack suit sets
7–8″ (athletic) — chest−waist 8–10″: Broader chest vs waist — athletic cuts
3–4″ (portly) — chest−waist 2–5″: Larger midsection — consider portly/comfort fit

Suit size scenarios (calculator output)

Scenario	Measurements	Jacket	Pants	Shirt	Drop	EU ~
Default — 5′10″ classic fit	40″ chest · 34″ waist · 70″ height	40R	34 × 32	16/34	6″ (Standard (6″ drop))	50
Slim fit (same measurements)	Jacket −2″ vs classic	38R	34 × 32	16/34	4″ (Portly / comfort (small drop))	48
Athletic drop	44″ chest · 34″ waist (10″ drop)	44L	34 × 32	16.5/35	10″ (Athletic (large drop))	54
Tall & lean	6′2″ · 38″ chest	36L	32 × 34	15.5/35	4″ (Portly / comfort (small drop))	46
Short stature	5′6″ · 38″ chest	38S	32 × 30	15.5/32	6″ (Standard (6″ drop))	48
Relaxed / portly	42″ chest · 40″ waist	44R	40 × 30	17/33	4″ (Portly / comfort (small drop))	54

Worked sizing scenarios

Default — 5′10″ classic fit

40″ chest · 34″ waist · 70″ height

40R · 34 × 32 · shirt 16/34

Drop 6″ · Standard (6″ drop)

Jacket 40R · Pants 34 × 32 · Shirt 16/34 · EU ~50 · Standard (6″ drop)

Slim fit (same measurements)

Jacket −2″ vs classic

38R · 34 × 32 · shirt 16/34

Drop 4″ · Portly / comfort (small drop)

Jacket 38R · Pants 34 × 32 · Shirt 16/34 · EU ~48 · Portly / comfort (small drop)

Athletic drop

44″ chest · 34″ waist (10″ drop)

44L · 34 × 32 · shirt 16.5/35

Drop 10″ · Athletic (large drop)

Jacket 44L · Pants 34 × 32 · Shirt 16.5/35 · EU ~54 · Athletic (large drop)

Tall & lean

6′2″ · 38″ chest

36L · 32 × 34 · shirt 15.5/35

Drop 4″ · Portly / comfort (small drop)

Jacket 36L · Pants 32 × 34 · Shirt 15.5/35 · EU ~46 · Portly / comfort (small drop)

Short stature

5′6″ · 38″ chest

38S · 32 × 30 · shirt 15.5/32

Drop 6″ · Standard (6″ drop)

Jacket 38S · Pants 32 × 30 · Shirt 15.5/32 · EU ~48 · Standard (6″ drop)

Relaxed / portly

42″ chest · 40″ waist

44R · 40 × 30 · shirt 17/33

Drop 4″ · Portly / comfort (small drop)

Jacket 44R · Pants 40 × 30 · Shirt 17/33 · EU ~54 · Portly / comfort (small drop)

Step-by-step: default measurements

Chest 40″ → even size 40
Height 70″ (5′10″) → Regular → R
Classic fit → jacket 40R
Waist 34″ × inseam 32″ → pants 34 × 32
Neck 16″ / sleeve 34″ → shirt 16/34
Drop 6″ — Standard (6″ drop)

Limitations

Sizing varies by brand, country (US/UK/EU), and line (slim vs classic vs athletic)
Jacket number approximates chest in inches (even sizes) — not the same as shirt size or EU label
Shoulder fit is the hardest to alter — prioritize shoulder alignment when trying on
Women's and non-binary tailoring use different systems — this tool targets men's RTW conventions
In-store fitting and a tailor still beat any online estimate for wedding or bespoke purchases