Sub-1:20 Half Marathon — Training Paces and Fitness Profile

Sub-1:20 half marathon is serious competitive running — front-of-pack at most road races. This is the product of high training volume, consistent quality sessions, and years of aerobic development.

Quick answer: To break Sub-1:20:00 in the Half Marathon (RPI 58.4), your training paces are: easy 7:35/mi, threshold 6:11/mi, interval 5:26/mi. Equivalent fitness: Marathon 2:47:11, 10K 36:11.

Training paces for Sub-1:20:00 Half Marathon

RPI 58.4 · Goal: 1:19:59 · All paces in min/mile

Easy (80%+ of weekly running)
7:35/mi4:43/km
Marathon Pace
6:32/mi4:04/km
Threshold (comfortably hard)
6:11/mi3:51/km
Interval (VO2max sessions)
5:26/mi3:23/km
Repetition (short fast reps)
5:04/mi3:09/km

Calculated from Daniels/Gilbert oxygen cost equations. Easy pace means "this pace or slower."

Equivalent race fitness

These are the predicted equivalent times at other distances for a runner with RPI 58.4 — assuming comparable training for each distance.

Marathon

2:47:11

6:23/mi

10K

36:11

5:49/mi

5K

17:27

5:37/mi

Training approach for Sub-1:20:00 Half Marathon

For sub-1:20 half marathon, threshold running is the most race-specific training. The half marathon is essentially a sustained threshold effort for 80 minutes. Threshold tempo runs (25–40 minutes at threshold pace) build the metabolic stamina to sustain that effort. Long runs at easy pace develop the endurance base. Weekly volume of 55–75 miles supports the quality work.

Calculate your current training paces

The table above shows paces for Sub-1:20:00 Half Marathon fitness. Enter your current race time to see where you are now and how far from the goal you sit.

Training Pace Calculator

These paces are based on your race time — not your body

The Daniels/Gilbert formula predicts training zones from a single race result. StrideIQ goes further: it tracks how your body specifically responds to threshold and interval work — which sessions produce your biggest gains, how quickly you recover, and when your fitness is peaking. Population formulas start the conversation. Your individual response data finishes it.

Training pace tables →Start free trial

Common questions

What training paces are needed for sub-1:20 in the half marathon?

For sub-1:20:00 (1:19:59): Easy 7:35/mi, Marathon 6:32/mi, Threshold 6:11/mi, Interval 5:26/mi. RPI 58.4. Threshold at 6:11/mi sustained for 25–40 minutes is the primary quality session.

What marathon does sub-1:20 half fitness predict?

Sub-1:20 half marathon (RPI 58.4) projects to approximately 2:47:11 marathon potential — typically Boston qualifying territory for multiple age groups.

What 10K does sub-1:20 half fitness correlate with?

Sub-1:20 half fitness (RPI 58.4) corresponds to approximately 36:11 10K fitness. This is the most reliable cross-distance equivalency pair in running.

Other goal pace guides

Sub-20 Minute 5K →Sub-25 Minute 5K →Sub-40 Minute 10K →Sub-50 Minute 10K →Sub-2 Hour Half Marathon →Sub-4 Hour Marathon →Sub-17 Minute 5K →Sub-18 Minute 5K →Sub-19 Minute 5K →Sub-21 Minute 5K →Sub-22 Minute 5K →Sub-23 Minute 5K →Sub-24 Minute 5K →Sub-27 Minute 5K →Sub-30 Minute 5K →Sub-35 Minute 10K →Sub-36 Minute 10K →Sub-37 Minute 10K →Sub-38 Minute 10K →Sub-39 Minute 10K →Sub-42 Minute 10K →Sub-45 Minute 10K →Sub-48 Minute 10K →Sub-55 Minute 10K →Sub-60 Minute 10K →Sub-1:15 Half Marathon →Sub-1:25 Half Marathon →Sub-1:30 Half Marathon →Sub-1:35 Half Marathon →Sub-1:40 Half Marathon →Sub-1:45 Half Marathon →Sub-1:50 Half Marathon →Sub-2:30 Marathon →Sub-2:45 Marathon →Sub-3 Hour Marathon →Sub-3:05 Marathon →Sub-3:10 Marathon →Sub-3:15 Marathon →Sub-3:20 Marathon →Sub-3:30 Marathon →Sub-3:45 Marathon →Sub-4:30 Marathon →Sub-5 Hour Marathon →Training Pace Calculator →

Paces calculated using the Daniels/Gilbert oxygen cost equations (1979). All values derived from the same formula used by the StrideIQ training pace calculator. Goal times use the target-minus-one-second convention (e.g., sub-20 = 19:59 input).