Sub-1:40 Half Marathon — Training Paces and Fitness Profile

Calculate your current training paces

Enter a recent race time to see the paces you can train at today.

Training Pace Calculator

Race Distance

Race Time

Sub-1:40 half marathon is meaningful competitive fitness — a level that requires structured training beyond easy running. Runners here have developed real threshold stamina and aerobic capacity.

Quick answer: To break Sub-1:40:00 in the Half Marathon (RPI 45.1), your training paces are: easy 8:57/mi, threshold 7:27/mi, interval 6:51/mi. Equivalent fitness: Marathon 3:27:51, 10K 45:08.

Training paces for Sub-1:40:00 Half Marathon

RPI 45.1 · Goal: 1:39:59 · All paces in min/mile

Easy (80%+ of weekly running)

8:57/mi5:33/km

Marathon Pace

7:56/mi4:55/km

Threshold (comfortably hard)

7:27/mi4:37/km

Interval (VO2max sessions)

6:51/mi4:15/km

Repetition (short fast reps)

6:27/mi4:00/km

Calculated from StrideIQ's RPI 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 45.1 — assuming comparable training for each distance.

Marathon

3:27:51

7:56/mi

10K

45:08

7:16/mi

21:46

7:00/mi

Training approach for Sub-1:40:00 Half Marathon

For sub-1:40 half marathon, one threshold session per week (20–25 minutes at threshold pace) and weekly long runs (11–14 miles) produce the specific adaptations this standard requires. Easy volume of 30–45 miles per week supports the quality work. The most common limiting factor at this level: insufficient threshold training or running easy days too fast to recover adequately.

Your goal

Build the plan to 1:39:59.

StrideIQ builds your training plan from your own running history once you link your Garmin or Strava.

Build my plan to 1:39:59

Your first 30 days are free. Add a card when they end to keep going.

Common questions

What training paces should I use to break 1:40 in the half marathon?

For sub-1:40:00 (1:39:59): Easy 8:57/mi, Threshold 7:27/mi, Interval 6:51/mi. RPI 45.1. Threshold at 7:27/mi should be sustainable for 20 minutes at controlled effort — comfortably hard, not racing.

How long does a 1:45 runner typically take to reach 1:40?

The 1:45 → 1:40 transition typically takes 4–12 months of structured training. The key additions are extending threshold sessions from 15 to 20–25 minutes and maintaining consistent long runs of 12–14 miles. Runners who add these two elements consistently typically bridge this gap within a training cycle.

What marathon does sub-1:40 half fitness project to?

Sub-1:40 half marathon (RPI 45.1) projects to approximately 3:27:51 marathon potential. This is a meaningful marathon benchmark that reflects the aerobic capacity built through half marathon training.

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-1:20 Half Marathon →Sub-1:25 Half Marathon →Sub-1:30 Half Marathon →Sub-1:35 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 StrideIQ's RPI equations. 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).