How to calculate dive weight for a belt
Start with the lead you need in total, then decide how much rides on the belt and how much goes in integrated pockets. Pick the size of weight you own (for example 1 kg or 2 lb pieces) and the calculator rounds to whole pieces, splits them left and right, and sizes the belt to your waist.
Correct size of the diving belt
Measure your waist over the exposure suit you will dive, then add about 25 cm (10 in) for the tail and adjustment. A belt that is too short will not close over a thicker suit; one that is too long leaves a loose tail that can snag. Re-measure when you change suits.
Plan weight belt selection for common dives
| Scenario | Suit | Estimate for an 80 kg diver (Al 80) | Typical placement |
|---|---|---|---|
| Warm-water boat dive | 3 mm | 4.5 kg (10 lb) | All on belt or half and half |
| Temperate coastal dive | 5 mm | 6.5 kg (14.5 lb) | All on belt or half and half |
| Cold-water dive | 7 mm | 8.5 kg (18.5 lb) | Split between belt and pockets |
| Mountain lake dive | 5 mm | 4.5 kg (10 lb) | All on belt or half and half |
| Drysuit dive | Drysuit | 10.5 kg (23 lb) | Split between belt and pockets |
Estimates only. Use your own body weight in the main calculator.
Belt safety
Wear the belt so the buckle sits on top and releases with one hand, and keep it free of straps and hoses. Distribute weights evenly left and right; trim weights toward the back can help if your feet sink.
Common questions
How do I calculate the weight belt for scuba?
Find your total lead, choose how much goes on the belt, then divide by the size of your weight pieces. The calculator does this and rounds to whole pieces.
What is the correct size of a diving belt?
Waist measured over your suit plus about 25 cm (10 in) is a good starting length. Try it on with your suit before diving.
Belt or integrated weights?
Integrated pockets sit more comfortably, while a belt is simple and easy to adjust. Many divers split the lead between the two.
