Sub-1:50 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-1:50 half marathon is a meaningful step toward competitive recreational fitness. It sits between the recreational milestone of sub-2:00 and the structured training level of sub-1:45 — and getting there typically requires adding real quality work to an easy-run base.

Quick answer: To break Sub-1:50:00 in the Half Marathon (RPI 40.4), your training paces are: easy 9:46/mi, threshold 8:08/mi, interval 7:29/mi. Equivalent fitness: Marathon 3:47:43, 10K 49:35.

Training paces for Sub-1:50:00 Half Marathon

RPI 40.4 · Goal: 1:49:59 · All paces in min/mile

Easy (80%+ of weekly running)

9:46/mi6:04/km

Marathon Pace

8:42/mi5:24/km

Threshold (comfortably hard)

8:08/mi5:03/km

Interval (VO2max sessions)

7:29/mi4:38/km

Repetition (short fast reps)

7:05/mi4:24/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 40.4 — assuming comparable training for each distance.

Marathon

3:47:43

8:41/mi

10K

49:35

7:59/mi

23:54

7:42/mi

Training approach for Sub-1:50:00 Half Marathon

For sub-1:50 half marathon, the primary additions to a recreational base are threshold training and extended long runs. One threshold session per week (12–18 minutes at threshold pace) and long runs building to 11–13 miles produce the adaptations this level requires. Easy volume of 25–35 miles per week with strictly easy recovery days allows these quality sessions to generate adaptation.

Your goal

Build the plan to 1:49:59.

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

Build my plan to 1:49:59

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

Common questions

What training paces should I use to target sub-1:50 half marathon?

For sub-1:50:00 (1:49:59): Easy 9:46/mi, Threshold 8:08/mi. RPI 40.4. Easy pace (9:46/mi) is where the majority of your training volume lives. Threshold at 8:08/mi for 12–18 minutes once per week builds the specific metabolic capacity sub-1:50 requires.

What is the typical progression from 2:00 to sub-1:50?

Runners who have broken 2:00 in the half typically reach sub-1:50 in 4–8 months of structured training. The key transitions: running easy days more strictly easy (often requires slowing down significantly), adding a threshold session each week, and building the long run to 11–13 miles consistently. This combination produces steady improvement.

What marathon does sub-1:50 half fitness predict?

Sub-1:50 half marathon fitness (RPI 40.4) projects to approximately 3:47:43 marathon potential. If the marathon is your next goal, this fitness level puts you in range for the predicted time — with full marathon-specific preparation (20-mile long runs, marathon-pace work).

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-1:40 Half Marathon →Sub-1:45 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).