RrUuIiEn Small Kayak Paddles, Plastic Canoe Paddle for Children, yellow $17.99 View on Amazon
Reference
Size charts
Quick answerEvery chart is computed by the same math as the calculators, so the numbers agree everywhere on the site.
Paddle board size chart by weight and height
Paddle board size chart for every rider weight from 100 to 350 lb: volume in litres, width, length and the rated capacity to look for, by skill level.
Kayak paddle length chart by height and boat width
Kayak paddle length chart in centimetres and inches for every height from 4'10" to 6'6" and boat widths from under 23 to over 36 inches.
SUP paddle length chart by height
Stand up paddle length chart for heights 4'10" to 6'6": all-round, touring and surf lengths in inches and centimetres, and where to set an adjustable paddle.
Kayak size chart by height and weight
Kayak length and capacity chart by paddler height and weight for lakes, rivers, touring and tandem use, plus youth kayak sizes for kids.
Recreational kayak weight capacity chart
What weight capacity kayak you need for every paddler weight from 100 to 350 lb, with day gear, a child or dog passenger, or a second adult, using the 70 percent rule.
Life jacket size chart: kids by weight, adults by chest
PFD size chart: infant, child and youth USCG weight classes, adult chest size bands from S/M to 4XL, and when an inflatable life jacket is allowed.
Paddle board PSI and pump time chart
What PSI to inflate a paddle board to, how many pump strokes and minutes it takes for common board sizes, and how much pressure rises in hot sun.
Kids paddle board and kayak size chart by age
What size paddle board and kayak for kids aged 6 to 16: typical height and weight by age, board length, kayak size, paddle length and life jacket class.
Popular sized gear
RrUuIiEn Small Kayak Paddles, Plastic Canoe Paddle for Children, yellow 
Leader Accessories Adult USCG Approved Life Jacket Vest (Blue, 2XL) USCG approved $44.99 View on Amazon
Sizing specs: Leader Accessories Adult USCG Approved... 
Pelican Symbiosa Kayak Paddle - Adjustable Fiberglass Shaft with Nylon Blades - Lightweight, Perfect for Kayaking - 90.5 to 94.5 in - Blue 240 cm / fiberglass shaft $110.99 View on Amazon
Hornet Watersports Graphic Fiberglass Kayak Paddle- Ideal for Touring, Fishing and Boating- 90.5 inches / 230CM Adjustable with Carbon Fiber Shaft - Kayak Oars Kayaking Equipment (Blue Scales) 230 cm / carbon shaft $169.99 View on Amazon
Werner Paddles Sherpa 1 Piece Straight Shaft Kayak Paddle - Lightweight Fiberglass Paddle for Whitewater - Amber - 194 cm (Standard Shaft Diameter - R30 Feather Angle) 194 cm / fiberglass shaft $329.00 View on Amazon
BOTE Lowrider Aero 11'6" Tandem SUP Kayak Hybrid | Inflatable Board 11'6" $1,299.00 View on Amazon
Sizing specs: BOTE Lowrider Aero 11'6" Tandem SUP... This is researched general information, not professional advice. Sizing figures are starting points: confirm against the maker's own sizing chart and the capacity printed on the boat or board.