Is My Goal Time Realistic? An Honest Test

Here is the honest test. Get your projected time from a recent race. Then compare your goal to it. If your goal is within your projected range, it is realistic. If it is 1 to 3% faster, it is a fair stretch. If it is more than 6% faster, it is likely a fantasy for one training cycle.

The table below turns the gap between your goal and your projection into a clear verdict.

Gap vs projection	Verdict	What to do
Within your range	Realistic	Trust it. Train the plan and race it.
1–3% faster	Stretch (A goal)	Doable in one cycle. Add volume and one quality run a week.
3–6% faster	Bold	Needs a big jump and a great day. Keep a B goal too.
More than 6% faster	Fantasy for one cycle	Aim for it across two cycles, not one.

The honest test

Most runners pick a goal from a dream, not from their training. That is how races fall apart.

The fix is simple. Start with a number you have earned. Run a recent race — a 5K, 10K, or half — and get a projected finish time for your goal race. That projection is your honest starting line.

Now find the gap. Take your goal time and your projected time. How much faster is your goal, as a percent?

• A goal that lands inside your projected range is realistic. Your training already supports it.
• A goal 1 to 3% faster is a fair stretch. With a good block, you can close that gap.
• A goal more than 6% faster in one cycle is almost always too much. You will likely pay for it in the last few miles.

This is not about dreaming small. It is about aiming at a target you can actually hit.

How big a jump is reasonable in one season?

It depends on how long you have been running.

New runners improve fast. In the first year of steady training, a beginner can gain 10 to 15% in pace (RunnersConnect, 2024). The body is new to the work, so it adapts quickly.

Trained runners improve slowly. If you have raced for years, your gains are smaller. A 1 to 3% drop in one cycle is a real win. Big leaps are rare.

What drives the gains? Mostly how much you run. A huge study of 2,303 runners found that weekly miles change your marathon time a lot — even between runners with the same short-race speed (Vickers & Vertosick, 2016). So a fair goal comes with a fair plan: more steady miles, one long run, and one quality run each week.

If your goal needs a 5% jump but your weekly miles will not change, the goal is not real yet. Fix the plan first.

Red flags your goal is a fantasy

Watch for these warning signs:

The pace is way faster than you have ever held. If your goal pace is far quicker than your recent races, your body has no proof it can do it.

You have to go out too fast to hit it. Runners who start 5 to 10% too fast burn through stored fuel early and hit the wall between miles 18 and 22 (RunnersConnect marathon pacing, 2024). A goal that forces a hot start is a trap.

The plan does not match the goal. Big goals need big training. If the miles, the long runs, and the months are not there, the number is a wish.

The science backs steady, even pacing over a fast start. A review of marathon pacing found that holding back early — and even running the second half a touch faster — leads to better times and less suffering (Grivas, 2025). A realistic goal lets you do that.

Check yours

Enter a recent race and let PIRX project your goal-race time — free, no signup, no watch. Compare your goal to the projection and read it against the table above.

PIRX's proprietary machine-learning prediction engine learns your style instead of using one fixed formula. It shows a supported range, not a fake-exact number, so you can see at a glance whether your goal sits inside it, just above it, or far beyond it.

This is what makes PIRX different. Strava tells you what you did. Garmin shows your data. PIRX tells you why it happened and what's next — with validated prediction accuracy of 98% across PIRX users.

New here? Start with the complete guide to predicting your race time. Want to see your time at every distance? Read race equivalency explained. Moving up in distance? Try what marathon you can run off your half. When you are ready, check your goal below.

Sources

• RunnersConnect (2024). How much faster can you get in a year? (Beginners ~10–15% pace gain in 12 months; trained runners far less.)
• Vickers, A.J. & Vertosick, E.A. (2016). An empirical study of race times in recreational endurance runners. BMC Sports Science, Medicine and Rehabilitation. (2,303 recreational runners; weekly mileage drives marathon time.)
• Grivas, G.V. (2025). The physiology and psychology of negative splits: optimal marathon pacing. Frontiers in Physiology.
• RunnersConnect (2024). Marathon pacing: the 10-10-10 method (Starting 5–10% too fast empties fuel early and causes the wall at miles 18–22.)