Kayak Size Calculator
Find the right kayak length and weight capacity for your body weight and paddling style.
Covers recreational, touring, sea, and whitewater kayaks.
Kayak sizing matches the boat’s length, width (beam), and cockpit dimensions to your body size, paddling style, and intended water type. The wrong size kayak is both uncomfortable and inefficient.
Key Measurements:
- Length: Longer = faster and tracks straighter; shorter = more maneuverable
- Beam (width): Wider = more stable; narrower = faster, requires more skill
- Cockpit size: Must fit your hips with room to exit in a capsize
- Weight capacity: rated capacity should be your loaded weight divided by 0.70, which is roughly 43% of headroom
Sizing Guide by Kayak Type:
| Kayak Type | Length | Beam | Best For |
|---|---|---|---|
| Recreational | 2.7–3.7 m | 66–76 cm | Calm lakes, beginners |
| Touring / Sea | 3.7–5.2 m | 56–64 cm | Open water, multi-day trips |
| Whitewater playboat | 1.8–2.3 m | 61–69 cm | River features |
| Whitewater creek | 2.3–2.7 m | 61–69 cm | Fast water, drops |
| Fishing | 3.0–4.3 m | 76–91 cm | Stability over speed |
Weight Capacity Formula:
Effective carry = Rated capacity × 0.70
(Manufacturers rate at 100% load, where performance degrades badly. Use 70% as your working limit.)
Worked Example:
Paddler: 90 kg, gear: 15 kg, total = 105 kg.
Minimum rated capacity: 105 / 0.70 = 150 kg
The calculator assumes a gear weight for you, and it varies by type: 20 lbs for a recreational boat, 15 for whitewater, 55 for fishing, 60 for touring. A loaded sea kayak on a four-day trip is a different animal from a lake boat with a water bottle in it.
For a 90 kg beginner on local lakes that means a recreational boat around 3.4 to 3.7 m long with a beam near 76 cm, rated to at least 150 kg.
Practical Tips:
- Test paddle before buying. Sit in the cockpit and check that your hips contact the seat without pinching
- Taller paddlers (above 185 cm) need longer cockpits for knee clearance
- A low-volume kayak (for lighter paddlers) will ride too low and take on water when used by a heavier person
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.