Half Marathon Pace Chart: Mile & Km Splits, Cadence & BPM

To finish a half marathon (13.109 miles / 21.097 km) in 2:00:00, you need a steady pace of 9:09 per mile (5:41 per km). A 1:45:00 finish requires 8:01 per mile (4:59 per km), while breaking 1:30:00 demands 6:52 per mile (4:16 per km).

The master chart below gives your exact mile splits, kilometer splits, 5K checkpoint times, and the target step cadence to maintain throughout race day.

Master half marathon pace and split chart

All splits assume an even effort over 13.1094 miles (21.0975 kilometers). Checkpoints at 5K, 10K, 15K, and 20K help you judge your effort on course before you reach the finish line.

Why half marathon pacing falls apart at Mile 9

Most runners who blow their half marathon goal do not fail because of poor fitness. They fail because of poor rhythm distribution.

The race typically falls apart in two specific places:

1. The Mile 1 adrenaline surge

When the starting gun fires, you feel light and fresh. You have thousands of runners around you, spectators cheering, and glycogen stores completely full. Running 20 to 30 seconds per mile faster than your goal pace feels effortless.

That early speed spike burns through your high-octane muscle glycogen far too early. By Mile 8, you have accumulated excessive lactate and muscular fatigue that your aerobic system cannot flush out while maintaining race pace.

2. The neuromuscular cadence drop

As fatigue sets in between Miles 8 and 11, your stride length tends to stay relatively similar while your turnover slows down. A drop from 170 steps per minute to 158 steps per minute represents a 7% reduction in step frequency.

Without realizing it, you add 40 to 60 seconds to every remaining mile. Your legs feel like lead, and you start overstriding to compensate, which drives braking forces through your knees and hips.

A clinical study in Medicine & Science in Sports & Exercise (Luedke et al., 2016) tracking recreational runners training for a half marathon found that runners with a lower step rate (under 163 SPM) experienced a 66.7% injury rate, while those with a step frequency above 168 SPM experienced only a 22.2% injury rate. Keeping your stride compact and your turnover high protects your joints when leg fatigue kicks in late in the race.

How to execute your target pace: even split vs negative split

There are two proven pacing strategies for the 13.1-mile distance:

Strategy 1: The Metronomic Even Split
Miles 1–13: 100% of goal pace from start to finish
Best for: Flat courses, predictable weather, disciplined runners who can ignore crowds.

Strategy 2: The Controlled Negative Split (Recommended)
Miles 1–3:   5–10 seconds slower per mile (suppress adrenaline, settle breathing)
Miles 4–10:  Lock into exact goal pace (cruise control)
Miles 11–13.1: Gradually push 5–10 seconds faster per mile (empty the tank)
Best for: Rolling courses, large crowd fields, and runners who want a strong finish.

Our detailed half marathon negative split strategy explains how to hold back early without giving away too much time on the clock.

The BPM lock: how music automates your pace chart

Staring down at your GPS watch every 200 meters creates mental tension and breaks your running posture. A more reliable way to maintain your split times is auditory motor synchronization: locking your foot strikes to music tempo.

As demonstrated by researchers in the Journal of Sports Sciences, syncing physical locomotion with acoustic beats lowers perceived exertion and stabilizes stride variability. When your legs match an external rhythm, you stop guessing your turnover.

Here is how to set up your BPM lock for race day:

1. Identify your target cadence from the chart above. For a 1:45 finish, that is typically 168 to 174 SPM.
2. Build a dedicated playlist matched to that exact tempo. Trying to manually skip songs on Spotify while dodging runners at water stations ruins your focus.
3. Use an automatic BPM tool. An app like GagaRun analyzes your Apple Music or local music library and plays only songs matching your chosen BPM. If you set it to 172 BPM, every track delivers that steady rhythm, keeping your foot turnover locked onto goal pace.
4. Use pace = cadence × stride length. As explained in our stride and cadence training guide, keeping cadence locked means you only need to adjust slight push-off force to hit your splits on hills or flat segments.

Course adjustments: when to deviate from the chart

Pace charts assume flat terrain, neutral wind, and moderate temperatures (45°F to 55°F / 7°C to 13°C). On race day, adjust your targets according to real-world conditions:

• Hills: Run by effort, not GPS pace. On uphills, maintain your cadence by shortening your stride length. Accept that your mile split will be 15 to 30 seconds slower. On downhills, let gravity work, keep your feet underneath your hips, and avoid overstriding.
• Heat and humidity: If race-day temperatures exceed 68°F (20°C) with high humidity, adjust your target finish time back by 2% to 4% (about 10 to 15 seconds per mile). Dehydration causes cardiac drift, driving your heart rate up even at lower speeds.
• Crowded starting corrals: Expect Mile 1 to be 10 to 20 seconds slower than goal pace due to runner congestion. Do not weave through crowds or sprint on sidewalks to make up that time instantly. Spread the deficit across the next 10 miles.

Compare your target to demographic benchmarks in our average marathon time by age chart and our 5K race day pacing strategy to ensure your goal matches your training foundation.

Frequently asked questions

Should my half marathon cadence be the same as my 5K cadence?

Usually your half marathon cadence is 4 to 8 steps per minute lower than your 5K cadence. In a 5K, you run closer to VO2 max with a wider stride angle and higher turnover. In a half marathon, your cadence sits at a sustainable, economical baseline where you can preserve glycogen.

What should I eat before aiming for a PR on this pace chart?

Eat a high-carbohydrate, low-fiber meal 2.5 to 3 hours before start time (such as oatmeal with a banana or white toast with honey). In the race itself, plan for 30 to 60 grams of carbohydrates per hour using energy gels and water starting around Mile 4 or Mile 5.

What if my GPS watch shows a different distance than the course markers?

Road courses are certified along the shortest possible line (the tangents). Most runners weave around participants and swing wide on turns, running 13.2 to 13.3 miles instead of 13.11. To hit your target finish time, plan your mile pace roughly 2 to 4 seconds faster per mile than the theoretical mathematical split.