Sea Kayak Cargo Volume Calculator
Calculate sea kayak cargo capacity by hatch size and trip duration.
Get usable liters for fore, aft, and day hatches and compare against typical gear loads.
Sea Kayak Cargo Volume Estimation
Cargo volume in sea kayaks is measured in liters but actual usable volume is 70-80% of the hatch’s “swept” volume because of:
- Bulkhead taper at bow/stern
- Hatch mounting hardware
- Required clearance for inflated dry bags
- Trim balance (don’t pack to extreme bow/stern)
Typical hatch volumes by kayak class:
| Class | Front Hatch | Rear Hatch | Day Hatch | Total Usable |
|---|---|---|---|---|
| Day-touring (12-14 ft) | 25-50 L | 35-65 L | 0-15 L | 60-130 L |
| Touring (14-17 ft) | 50-90 L | 70-130 L | 10-25 L | 130-245 L |
| Expedition (17+ ft) | 80-150 L | 100-200 L | 20-40 L | 200-390 L |
| Tandem touring | 80-150 L | 100-200 L | + center hold | 200-400+ L |
Practical capacity (trip days vs. typical gear):
| Trip Type | Gear Volume |
|---|---|
| Day trip (food, water, layers) | 15-30 L |
| Overnight (tent, bag, food, stove) | 60-100 L |
| Weekend (2-3 nights) | 100-150 L |
| 5-7 day expedition | 180-280 L |
| 10-14 day expedition | 300-450 L |
Packing strategy by hatch:
- Front hatch (forward): Light items only (tent body, sleeping bag, clothing). Heavy gear forward = bow plowing, slow paddling.
- Rear hatch (aft): Heavy items (water, food bags, stove + fuel). Aft loading = stable tracking.
- Day hatch: Snacks, sunscreen, first aid, repair kit — items needed without unpacking main hatches.
- Deck rigging: Spare paddle, water bottles, chart, towline. Light/exposed items only.
Heavy item weight distribution:
- Keep heaviest weight in the rear hatch toward the cockpit (not at the stern)
- Water and food bags: split between front and rear, but more in rear
- Heavy stove/fuel: forward third of rear hatch
Volume vs. weight: A typical loaded sea kayak holds 80-150 lbs of gear (depending on paddler weight + boat displacement). Most kayaks max at 250-400 lbs total payload (paddler + gear). Always verify your boat’s stated max payload.
Dry bag sizing rule of thumb:
- 5 L dry bag: small clothes, electronics
- 10 L: full set of clothing
- 20 L: tent + footprint
- 35 L: sleeping bag + pad
- 55 L: kitchen kit + food for 5 days
- Buy roll-top closure dry bags 1.3× larger than gear volume
Compression packing tip: Stuff sleeping bag and clothes into bow / stern points first — these tapered sections only fit soft compressible gear. Save the wider midsection for stoves, food cases, and heavier items.