function calcGear(){var base=document.getElementById("base").value||"1:15";var gear=document.getElementById("gear").value;var p=base.split(":");var secs=parseInt(p[0])*60+(parseInt(p[1])||0);var mult=gear==="none"?1:gear==="pullbuoy"?0.95:gear==="paddles"?0.94:gear==="both"?0.90:0.87;var adj=Math.round(secs/mult);var pct=Math.round((1-mult)*100);document.getElementById("r1").textContent=Math.floor(adj/60)+":"+String(adj%60).padStart(2,"0")+"/100m";document.getElementById("r2").textContent="+"+pct+"% slower";document.getElementById("desc").innerHTML="Equipment: "+gear+"
Effective pace: "+Math.floor(adj/60)+":"+String(adj%60).padStart(2,"0")+"/100m
Slowdown: +"+pct+"%
Note: drag equipment is for training stress, not for swimming faster. Remove for speed work and races.";document.getElementById("results").style.display="block";}