For a diver that is treated as 64 °F, so a 3/2 mm full suit is the minimum. Many divers choose a 5 mm suit at this temperature for long or repeated dives.
How the wetsuit calculator works
WetsuitSizeCalc compares your height and weight with each size in a generic men’s or women’s chart. A size scores zero when you are inside both its height and weight range; otherwise it scores the inches you are outside the height range plus the pounds outside the weight range divided by five. The lowest score wins, with ties going to the size whose range middles are closest to you, and the runner-up is shown as an alternative. For thickness it takes the water temperature, subtracts 6 °F if you dive and 4 °F if you run cold, and looks it up in the temperature chart.
Wetsuit thickness by water temperature
| Water | Suit | Accessories |
|---|---|---|
| 78 °F and up (26 °C+) | No wetsuit needed | Rash guard or swimsuit |
| 72–77 °F (22–25 °C) | 0.5–2 mm top or shorty | None |
| 65–71 °F (18–22 °C) | 2 mm shorty or spring suit | None |
| 60–64 °F (16–18 °C) | 3/2 mm full suit | None |
| 55–59 °F (13–15 °C) | 4/3 mm full suit | Boots optional |
| 50–54 °F (10–12 °C) | 4/3 or 5/4 mm full suit | Boots |
| 45–49 °F (7–9 °C) | 5/4 mm hooded full suit | Boots and gloves |
| 40–44 °F (4–7 °C) | 6/5 mm hooded full suit | 7 mm boots and 5 mm gloves |
| Below 40 °F (4 °C) | 6/5 mm or thicker, or a drysuit | 7 mm boots, 5–7 mm gloves and hood |
Men’s wetsuit sizes
| Size | Height (in) | Weight (lb) |
|---|---|---|
| XS | 64–67 | 115–135 |
| S | 66–69 | 130–150 |
| MS | 65–68 | 145–165 |
| M | 68–71 | 145–165 |
| MT | 71–74 | 150–170 |
| LS | 67–70 | 165–185 |
| L | 70–73 | 165–185 |
| LT | 73–76 | 170–190 |
| XLS | 69–72 | 185–210 |
| XL | 71–74 | 185–205 |
| XLT | 74–77 | 190–210 |
| XXL | 72–76 | 205–230 |
| 3XL | 73–77 | 225–260 |
Women’s wetsuit sizes
| Size | Height (in) | Weight (lb) |
|---|---|---|
| 2 | 60–63 | 95–110 |
| 4 | 62–65 | 105–120 |
| 6 | 63–66 | 115–130 |
| 8 | 64–67 | 125–140 |
| 10 | 65–68 | 135–150 |
| 12 | 66–69 | 145–165 |
| 14 | 67–70 | 160–180 |
| 16 | 67–70 | 175–195 |
Frequently asked questions
What wetsuit do I need for 80 degree water diving?
A 3 mm full suit or shorty is common in tropical water, mainly for protection and comfort on several dives a day.
Why does depth make a wetsuit colder?
Neoprene is full of gas bubbles that compress under pressure, so at 60 ft (18 m) a suit is noticeably thinner and less warm.
When should I use a drysuit?
Many divers switch to a drysuit below about 50 °F (10 °C), especially for long or deep dives.
Is WetsuitSizeCalc free?
Yes, with no sign-up or ads, and your measurements stay in your browser.
Is this chart the same for every brand?
No. It is a typical generic chart. Brands vary, so confirm with the maker’s chart, and try a suit on if you can.