Setting My 10k Goal: How Fast Should I Run?

I’ve been running for over a year. After six months of training (70 miles/month) I ran a 10k in 39:40. Since then I’ve tried a few more races over the summer (in the heat) with my best time a disappointing 40:10. I also ran 1500m in 4:45.

A few months ago I increased my mileage to 100 miles/month, and a few weeks ago I ran a 1:30:20 half marathon.

What time should I shoot for in my next 10k race? – Rick T., Portland

Answer by Dom:
Hi Rick, thanks for your question about setting your 10k goal — and great results so far!

You're in a really interesting position here. Your 1500m of 4:45 shows excellent raw speed — that's a genuinely impressive performance at any level. Meanwhile your 1:30:20 half marathon shows your endurance has taken a big step forward since you upped the mileage. The challenge is making sense of what those two data points together tell you about your 10k potential.

I'll break this down as follows:

1. What the race conversion calculator predicts for your next 10k
2. Understanding the gap — why your numbers tell a mixed story
3. Recommended focus for the longer term
4. Setting your goal using training paces
5. Setting an A goal and a B goal

1. Prediction Based on the Race Conversion Calculator

I plugged your times into the race conversion calculator and here's what comes back:

• Based on your 1500m of 4:45 (not the most reliable predictor for longer events): predicted 10k around 35–36 minutes, predicted half marathon around 1:18.
• Based on your 10k PR of 39:40 (a much better predictor): expected half marathon of 1:27.
• Based on your half marathon of 1:30:20: predicted 10k of around 41:30.

So what do these numbers tell us? Your 1500m suggests speed that's well ahead of where your endurance currently sits. Your 10k PR predicts a faster half than you ran — which suggests your endurance has improved significantly since that 39:40 race (which makes sense given you've jumped from 70 to 100 miles per month). Your recent half marathon, on the other hand, predicts a 10k around 41:30 — a little slower than your PR.

In short: your endurance is catching up to your speed, but the picture is still evolving. I'd suggest targeting 38–39 minutes for your next 10k — that's achievable, ambitious without being reckless, and consistent with where your fitness appears to be heading.

2. Understanding the Gap — Why Your Numbers Tell a Mixed Story

The reason your 1500m predicts such a fast 10k whilst your actual 10k is slower comes down to the relationship between raw speed and aerobic endurance.

Your 4:45 for 1500m is genuinely quick — it requires a very high VO2 max and excellent fast-twitch muscle recruitment. But the 10k is far more dependent on your aerobic engine: your ability to sustain a high percentage of that VO2 max for 40+ minutes. That's a different quality, and it develops more slowly.

The encouraging thing is that your jump from 70 to 100 miles per month is exactly the kind of work that builds aerobic capacity. The 1:30:20 half marathon tells me that investment is starting to pay off. Your endurance has genuinely improved — it just hasn't fully closed the gap to your speed yet, which is actually a very good place to be. It means there's real headroom for improvement in the 10k over the next year or so.

3. Recommended Focus for the Longer Term

What needs building most right now is sustained aerobic endurance — the ability to hold a fast pace comfortably for the full 10k distance. Here's what I'd prioritise:

Continue building your monthly mileage gradually. You've gone from 70 to 100 miles per month — that's a solid jump. Keep adding volume slowly, with the majority of that mileage at genuinely easy, conversational pace. Base building takes years, not weeks, but the compound effect is enormous.

Add tempo runs as a regular session. Tempo running is the most direct way to train your body to hold a hard pace. A typical session might be 20–30 minutes at comfortably hard effort — you can speak in short phrases but not freely. Do this once a week during your build phase.

Add interval work closer to your target race. Once you have a solid base and consistent tempo work, 4–6 weeks of interval sessions will sharpen your speed. Short intervals — 800m or 1km repeats at target 10k pace — work well here.

With this approach, I wouldn't be surprised if you run 38–39 minutes in the near term, and potentially faster still over the following year.

4. Setting a Goal Using Your Training Paces

Another way to arrive at a realistic target is to work backwards from your current training paces. The running pace calculator is useful here — you can use it in reverse to check what a given 10k target implies for your easy pace and tempo pace.

For a 38–39 minute 10k, you're looking at a race pace of roughly 3:48–3:54 per kilometre (about 6:06–6:17 per mile). If your current tempo sessions are feeling comfortable at around 4:00 per kilometre, that suggests you're close to that range already. If your tempo pace is a little slower, a 39–40 minute target may be the more appropriate aim for your next race.

Pay attention to your easy pace too. If your easy runs are sitting around 5:00–5:15 per kilometre, that's consistent with someone running in the high 38s to low 40s for 10k. The more you pay attention to these relationships in training, the better your feel for realistic race targets becomes.

5. Set an A Goal and a B Goal

I always recommend setting two goals before a race rather than one. A single goal creates an all-or-nothing outcome — a warm day, a hilly course, or slightly tired legs can leave you feeling like you failed even when you ran well.

For your next 10k, I'd suggest something like:

• A goal (ideal conditions, everything clicks): sub-39 minutes
• B goal (solid performance, not a perfect day): sub-40 minutes

Both are legitimate targets based on your current fitness. The A goal gives you something to chase hard; the B goal ensures you finish satisfied even if conditions aren't perfect. It also helps with pacing strategy on race day — you can go out at A goal pace and, if it's not quite there, lock onto a meaningful fallback rather than just hanging on.

Best of luck with your next 10k, Rick — you're clearly making good progress and the hard work with the mileage is starting to show. I hope the numbers keep moving in the right direction!

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