Kayaking & Water Calculators
Paddle sizing, kayak loading, float plans, river flow, tide timing and wetsuit thickness guides.
Paddle Size Calculator
Calculate the ideal paddle length based on your height, kayak width and paddling style.
Kayak Weight Capacity Calculator
Calculate remaining weight capacity after paddler weight and gear.
Float Plan Calculator
Create a float plan with estimated times, distances and checkpoint details.
River Flow Calculator
Estimate river flow speed and paddling time from distance and current conditions.
Tide Calculator
Estimate tide heights using the rule of twelfths for coastal trip planning.
Wetsuit Thickness Calculator
Find the right wetsuit thickness based on water temperature and activity duration.
PFD Size Calculator
Determine the right personal flotation device size based on chest measurement and weight.
Canoe Loading Calculator
Calculate optimal weight distribution in a canoe for stability and trim.
8 free calculators in Kayaking & Water
Kayaking and Water Activity Planning
Water-based activities require careful planning around equipment sizing, weight distribution and environmental conditions. Whether you're sea kayaking around the UK coast or canoeing on a Scottish loch, having the right setup improves both safety and enjoyment.
Paddle length depends on your height, the width of your kayak and your paddling style. A high-angle paddling style (used for faster, more aggressive paddling) requires a shorter paddle than a low-angle touring style. Our paddle size calculator accounts for all these factors.
The rule of twelfths is the standard method for estimating tide heights between high and low water. The tide rises or falls in the pattern 1/12, 2/12, 3/12, 3/12, 2/12, 1/12 over six hours. This is essential knowledge for coastal kayaking and planning beach launches.