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Wetsuit Thickness Calculator

Get the right wetsuit for your water temperature and activity

Recommended

3/2mm Full

Seal

Sealed (GBS)

Max Time

3h

Wetsuit Recommendation

3/2mm Full

Sealed (GBS) seams

Accessories Needed

HoodNo
GlovesNo
BootsYes
Max Comfort Duration3 hours

Example Calculations

1Surfing at 62°F, average tolerance

Inputs

Water Temp62°F
ActivitySurfing
ToleranceAverage

Result

Wetsuit3/2mm Full

62°F with no adjustments falls in the 60–65°F range: 3/2mm with sealed seams and boots.

2Scuba diving at 55°F, runs cold

Inputs

Water Temp55°F
ActivityDiving
ToleranceRuns cold

Result

Wetsuit5/4mm Full

55°F − 1° diving adj − 1° cold = effective 53°F. 5/4mm with hood, gloves, and boots.

Frequently Asked Questions

Q

What wetsuit thickness do I need?

Wetsuit thickness depends on water temperature. Above 72°F, a rashguard or 1mm top suffices. At 60–72°F, use 2–3/2mm. Below 60°F, you need 4/3mm or thicker with accessories.

  • 72°F+: rashguard or 1mm
  • 65–72°F: 2mm full or 3/2mm
  • 55–65°F: 3/2mm to 4/3mm
  • Below 55°F: 5/4mm+ with hood/gloves
Water TempThicknessAccessories
70–80°F1–2mmNone needed
60–70°F3/2mmOptional boots
50–60°F4/3–5/4mmBoots, optional hood
Below 50°F5/4–6/5mmHood, gloves, boots
Q

What does 4/3mm mean on a wetsuit?

The numbers 4/3mm mean the torso is 4mm thick and the arms/legs are 3mm thick. The thicker torso keeps your core warm, while thinner limbs allow better flexibility for paddling and swimming.

  • First number: torso thickness
  • Second number: arm/leg thickness
  • Some suits have 3 numbers (e.g., 5/4/3mm)
  • Thicker = warmer but less flexible
Q

Does activity type affect wetsuit choice?

Yes. Surfing and swimming generate body heat, so you can wear thinner suits. Scuba diving involves less movement and deeper (colder) water, requiring thicker neoprene. Kayaking stays above water, so a thinner suit often works.

  • Surfing: standard thickness
  • Diving: +1mm thickness
  • Kayaking: standard or -0.5mm
  • Swimming: +0.5mm (less body heat)
Q

How long can I stay in cold water with a wetsuit?

In a properly fitted wetsuit, you can stay 1–4 hours depending on water temperature. At 60°F in a 3/2mm suit, expect 2–3 hours of comfort. Below 50°F in a 5/4mm with hood, limit sessions to 1–2 hours.

  • 70°F+: 3–4 hours
  • 60–70°F: 2–3 hours
  • 50–60°F: 1.5–2.5 hours
  • Below 50°F: 1–1.5 hours

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Last Updated: Mar 20, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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