Sub 1:45 Half Marathon Pace Chart & Training Guide

Training for a Sub 1:45 Half Marathon

Running a Half Marathon in under 1:45 requires a pace of 4:59 per kilometer (8:01 per mile). This is a realistic goal for experienced runners who commit to a structured training plan over 8-16 weeks. Your weekly mileage should be in the 50-65 km range, with three quality sessions per week: one interval workout, one tempo run, and one long run. The key interval session is 3×3km @ 4:55/km with 90-second recovery jogs. Your tempo runs should be 30 min @ 5:00/km, building the lactate threshold endurance you need to hold race pace when fatigue sets in. Long runs should be 25-30% of your weekly volume, run at a comfortable pace 60-90 seconds slower than your target race pace. Consistency matters more than any single workout. Missing one session is fine, but missing a full week sets your aerobic base back by roughly two weeks. If you are coming off a break, add no more than 10% weekly mileage per week to avoid injury. For advanced runners, the key breakthrough comes from threshold training. Your lactate threshold pace is roughly 15-20 seconds per km faster than your target race pace. Progression long runs, where the final 3-5 km are at marathon pace, teach your body to run fast on tired legs. Strength training twice per week (squats, lunges, single-leg deadlifts) reduces injury risk by 50% and improves running economy by 2-4%. Track your resting heart rate each morning. A spike of 5+ bpm suggests incomplete recovery, and you should swap the day's quality session for an easy run. Sub-1:45 (4:58/km) is the most popular half marathon target worldwide. At just under 5:00/km, your pacing strategy matters more than at faster targets because the margin for error is slim. Going out at 4:50/km for the first 5 km will catch up with you at km 18 as a wall of fatigue. Even splits are the proven approach: practice locking in 4:58/km on a treadmill for 20-minute blocks to build pace memory in your legs.