Sizemaven

Sizemaven is a free website with 18 sizing tools for home, sports, outdoors, kids, pets and style: rugs, beds, curtains, snowboards, skis, golf clubs, wetsuits, backpacks, sleeping bags, kayak paddles, kids' shoes, youth baseball gloves, dog crates, dog harnesses, rings, shoes, belts and gloves.

You enter a few measurements, and each field says where the tape goes. The tool gives one size, explains the rule behind it and names its source. Most rules come from the people who make the product, such as Wilson's glove guide or Osprey's torso chart, and others come from retailers like REI and evo. Many answers come with a diagram drawn from your numbers.

Under the answer, Sizemaven lists products on Amazon whose listings confirm that size, filtered to your budget, with prices checked at least every 24 hours. Size guides answer common questions, such as what size rug goes under a queen bed, and a printable ring sizer is included.