18 tools, all free

Sea Water Temperature How warm is the sea today, and is it good for swimming? → Ski Conditions What’s the snow depth at the resort I’m heading to this weekend? → Windsurf Conditions Which spot has wind today, and does it suit my level? → Diving Map Where can I dive in Turkey, and which certified centre is nearest? → Wetsuit Thickness Chart How thick a wetsuit do I need for this water temperature? → Dive Weight Calculator How much lead do I need for this suit and tank? → Nitrox Calculator (MOD and EAD) How deep can I go with this nitrox mix? → SAC Rate Calculator How fast do I use my air, and how long will my tank last? → Running Couch to 5K Plan I’ve never run before — how do I get to 5 kilometres? → Running Running Pace Calculator What pace per kilometre do I need to run a marathon in 4 hours? → Cycling Bike Gear Ratio Calculator Will this cassette and chainring combination be a struggle on steep climbs? → Race Calendar Is there a race coming up in my city, and is registration open? → Running Running Clubs Which running clubs are there in my city, and on which days do they meet? → Running Running Calorie Calculator I ran 10 kilometres — how many calories did I burn? → Walking Calorie Calculator How many calories are 10,000 steps a day? → Cycling Cycling Calorie Calculator How many calories does an hour of cycling burn? → Running VO2 Max Calculator How does my fitness compare with people my age? → Training Target Heart Rate Calculator What should my heart rate be on a zone 2 run? →