10K to Half Marathon Training Plan
Two complete plans to bridge the gap from 10K to half marathon. The "First Half" plan (10 weeks) gets you to the finish line. The "Strong Half" plan (12 weeks) gets you there with confidence and a time to be proud of.
Short answer: if you can comfortably run a 10K on 15 to 20 miles per week, you can reach a half marathon in 10 to 12 weeks by adding one thing at a time, first a longer Saturday run, then in-race fueling, then (optionally) one weekly quality session. You do not need to restart from zero. The "First Half" plan below gets you to 13.1 miles with no time pressure; the "Strong Half" plan adds tempo and interval work for runners chasing a specific finish time.
Ready to Step Up? Here is What You Need
If you can run a 10K, you are closer to a half marathon than you think. The jump from 6.2 to 13.1 miles is significant, but it is achievable with the right plan. You already have the aerobic base. What you need now is time on your feet, longer long runs, and a fueling strategy.
Both plans below assume you can currently run a 10K comfortably (not racing it, just completing it without being wrecked) and that you are running 15 to 20 miles per week. If you are running fewer than 15 miles per week, spend 3 to 4 weeks building to that level before starting either plan.
The "First Half" plan is pure simplicity: 3 to 4 easy runs per week with a progressively longer Saturday long run. No tempo work, no intervals. Just build the distance. The "Strong Half" plan adds one quality session per week for runners who want to race the half marathon, not just finish it.
10 weeks
Frequency: 3-4 runs/week
Goal: Finish comfortably
Prerequisite: Can run 10K comfortably
Workouts: All easy pace, no speed work
12 weeks
Frequency: 4-5 runs/week
Goal: Race with a target time
Prerequisite: Can run 10K, running 20 mi/wk
Workouts: Includes tempo and intervals
Explore New Routes, Capture Territory
Stepping up from 10K to half means more ground to cover, which means more territory to claim. The longer your Saturday long run, the more of your city you own. That is a pretty good trade.
MoteraWhat Changes from 10K to Half Marathon
Long runs get longer (obviously)
Your longest training run jumps from 7 to 8 miles for a 10K to 11 to 12 miles for a half marathon. This does not sound like much, but those extra 3 to 4 miles change the demands on your body significantly. You will need to fuel during long runs and your recovery time will increase.
Fueling becomes essential
During a 10K, your body has enough stored glycogen to get through the entire race without eating. A half marathon takes 90 minutes to 2.5 hours, which means you will deplete your glycogen stores before the finish line. You need to practice taking energy gels during runs over 75 minutes.
Mental endurance matters more
A 10K is over before mental fatigue sets in for most runners. In a half marathon, miles 9 to 11 can feel psychologically crushing. The start line excitement is gone and the finish line is still far away. Training your mind to push through these lonely middle miles is as important as training your legs.
Pacing becomes critical
In a 10K, pacing mistakes are recoverable. Go out 15 seconds per mile too fast and you can still hold on. In a half marathon, that same mistake compounds over 13 miles and can cost you 5 to 10 minutes. You must start conservatively and resist the urge to chase the crowd in the first 2 miles.
Recovery takes longer
After a hard 10K, you can run normally within 3 to 5 days. After a half marathon, expect 7 to 10 days of reduced training. Your muscles, tendons, and joints need more time to repair from the longer effort. Plan your post-race week as a recovery week.
10K vs Half Marathon: Side-by-Side Comparison
Watch: Stepping Up From 10K to Half Marathon
The Running Channel walks through the same step-up decisions covered on this page: setting a realistic goal, adjusting your weekly training, fueling for the extra distance, tapering, and the mindset shift for race day.
Half Marathon Pace Prediction from 10K Time
Multiply your 10K finish time by 2.22 to 2.25 for a realistic half marathon estimate. The lower multiplier (2.22) assumes strong endurance and good pacing. The higher multiplier (2.25) is more conservative and better for first-time half marathoners. Here is a quick reference table.
For a more precise prediction, use our race pace calculator which uses the Riegel formula to predict race times across distances.
First Half Plan: 10 Weeks to the Finish Line
This plan is for runners who want to complete their first half marathon without any time pressure. Every run is at easy, conversational pace. No tempo runs, no intervals, no speed work. The only variable that changes each week is the Saturday long run distance, which builds from 6 miles to 11 miles.
Recovery weeks at Weeks 4 and 8 let your body absorb the training. The taper in Weeks 9 and 10 ensures you arrive at race day fresh. If any run feels too hard, slow down. If you need to walk during long runs, walk. The goal is to finish, and there is absolutely nothing wrong with a run/walk strategy for your first half marathon.
Strong Half Plan: 12 Weeks to a Time You Are Proud Of
This plan adds one quality workout per week on Wednesday: alternating between tempo runs and interval sessions. These workouts build your lactate threshold and running economy, which directly improves your half marathon pace. You will run 4 to 5 days per week with the long run on Saturday.
Long runs in Weeks 6 and 9 include half marathon pace finishes: running the last 2 to 3 miles at your target race pace. This teaches your legs what race pace feels like when they are already tired, which is the most race-specific workout you can do. Peak long run is 12 miles in Week 9. Use our training pace calculator to determine your exact paces.
Long Run Progression: 6 Miles to 12 Miles
The long run is the most important workout in your half marathon plan. It builds the endurance you need to sustain effort for 13.1 miles. Here is how your Saturday long run progresses and what to focus on at each stage.
Building comfort with longer runs. These should feel easy. Run at a pace where you can have a full conversation. Start building the habit of eating breakfast before your long run.
You are entering new territory if your longest run was 10K. Bring water or plan a route with water fountains. Start experimenting with energy gels on runs over 75 minutes.
A milestone. This is further than you have ever raced. Your body is adapting to the demands of longer efforts. Practice your exact race-day fueling strategy: pre-run meal, gel timing, water intake.
Your peak long runs. Take the last gel around mile 8 to 9, just like race day. If doing the Strong Half plan, run the last 2 to 3 miles at half marathon pace. After these runs, take the rest of the day easy.
Cross-checked against a published bridge plan
Our long run numbers land in the same range independently reported by Marathon Handbook's 10K to Half Marathon guide , which structures its 12-week bridge plan with a Week 1 long run of 6 miles, building to 8 miles by Week 4, 10 miles by Week 8, and 12 miles by Week 11, a nearly identical progression to the Strong Half plan above.
When to Start Taking Gels
One of the biggest adjustments from 10K to half marathon is in-race fueling. During a 10K, you probably only needed water. A half marathon is long enough that your glycogen stores will start to deplete, especially if you are running for 90 minutes or more. Energy gels provide a quick hit of carbohydrates to keep your muscles fueled.
Runner's Need, Energy Gels guide"These glycogen stores start to run low after about 90 minutes of running at half-marathon pace and around 120 minutes at marathon pace."
The 75-Minute Rule (practice before you need to)
The science above puts real necessity around 90 minutes. We recommend starting practice 15 minutes earlier than that, on any training run past 75 minutes (roughly 8 miles for most runners in this plan), so gel timing is second nature well before it becomes essential. STYRKR's gel guide recommends 1 to 2 gels per hour (roughly 30 to 60g of carbohydrate) once you pass the 90-minute mark, which lines up with taking a gel every 45 to 50 minutes during your longest training runs.
Race Day Fueling
Pre-race meal 3 hours before: toast with peanut butter, banana, or oatmeal with honey
First gel at mile 5 with water (not sports drink)
Second gel at mile 9 to 10 with water
Take water at every aid station, even early in the race
Never try a new gel brand on race day. Practice with your exact race-day gel during training.
For a detailed, personalized fueling plan, use our race fueling calculator. For hydration planning, try our hydration calculator.
The Mental Shift: 10K Brain vs Half Marathon Brain
The mental demands of a half marathon are very different from a 10K. In a 10K, you can run on adrenaline and determination for the entire race. A half marathon requires patience, pacing discipline, and the ability to stay calm when your body says it wants to stop. Here is how the race feels differently mile by mile.
Race Day Tips for First-Time Half Marathoners
Start slower than you think you should
Your first mile should feel easy. Almost too easy. If you start at your 10K pace, you will pay for it at mile 10. Target 15 to 20 seconds per mile slower than your 10K race pace for the first 3 miles, then settle into your half marathon pace.
Do not chase other runners in the first 2 miles
The energy at the start is electric and faster runners will pass you. Let them go. You will catch many of them between miles 10 and 13 when their aggressive starts catch up to them.
Walk the water stations if you need to
It is much easier to drink while walking. A 10 to 15 second walk at each water station costs you almost nothing in your finish time but ensures you stay hydrated. Pinch the cup into a spout to avoid choking.
Have a "bad mile" plan
At some point between miles 8 and 11, you will have a mile where everything feels hard. This is normal. Your plan: shorten your stride, focus on cadence, count your steps to 100, and repeat. It will pass.
Save your kick for the last mile
When you see the mile 12 marker, you have a 10-minute jog left. Pick up the pace gradually. By the last quarter mile, give it everything. Crossing that finish line strong is a feeling you will never forget.
Nothing new on race day
Wear shoes you have trained in. Eat the same pre-run breakfast. Use the same gel brand. Race day is for execution, not experimentation. Lay out everything the night before.
Common Mistakes When Stepping Up From 10K to Half Marathon
Runners who already own a 10K often underestimate the half marathon because they can already run. Here is where that confidence gets them into trouble.
Jumping straight to a 12-mile long run
Skipping the progression and trying an 11 or 12-mile run in Week 2 instead of Week 8 or 9 is the single biggest cause of stepped-up-too-fast injuries. Follow the weekly build even when it feels slow.
Treating every run at 10K effort
A 10K training block often uses a "just run hard and see" approach. Half marathon training needs true easy days so your legs recover enough to hit the long run and (if using Strong Half) the quality session.
Never practicing race-day fueling
Racing a 10K on water alone works. Racing a half marathon on water alone, when you have never practiced a gel, is how runners hit a wall at mile 10. Practice your exact race fueling on at least 3 long runs before race day.
Ignoring the recovery week
Weeks 4 and 8 (First Half) or 4 and 8 (Strong Half) intentionally drop volume. Skipping the recovery week to "keep momentum" is how overuse injuries like IT band syndrome and shin splints show up around Week 9 or 10.
Copying half marathon pace from 10K pace with no adjustment
Your half marathon pace should be 20 to 30 seconds per mile slower than 10K race pace, not the same. Runners who ignore this blow up between miles 9 and 11.
Buying new shoes the week of the race
New shoes need 20 to 30 miles of break-in before race day. If your current pair has more than 300 miles, replace them 3 to 4 weeks out, not 3 to 4 days out.
Is This the Right Half Marathon Plan for You?
Motera runs several half marathon guides for different starting points. This page is specifically the bridge plan for runners who already own a 10K. If your situation is different, one of these is a better fit.
This page: 10K to Half Marathon
You can already run a 10K comfortably at 15 to 20 miles per week. You need 10 to 12 weeks to add distance, fueling, and (optionally) pace work. The shortest path because you already have the aerobic base.
Half Marathon Training Plan for Beginners
You are newer to running and want a full 14-week beginner schedule that assumes a smaller starting base and includes walk breaks throughout, not just as a fallback.
View this planCouch to Half Marathon
You are starting from little or no running background at all, effectively zero to 13.1 miles. This is the longest and most gradual of the three, built for complete beginners rather than 10K graduates.
View this planHalf Marathon Training Plan (all levels)
You want to compare Beginner, Intermediate, and Advanced half marathon schedules side by side rather than a single bridge plan tied to a 10K starting point.
View this planFrequently Asked Questions
How long should I wait after a 10K to start half marathon training?
If you ran the 10K as a hard race effort, take 5 to 7 easy days before starting dedicated half marathon training. If you ran it as a comfortable training run, you can start right away. The key is that you should be running 15 to 20 miles per week consistently before beginning either plan.
Can I go from 10K to half marathon in 8 weeks?
It is possible if you are already running 20 or more miles per week and your 10K was comfortable. However, 10 to 12 weeks is safer and allows for proper long run progression. Rushing the jump from 6.2 to 13.1 miles increases your risk of IT band issues, shin splints, and general overtraining. We recommend the 10-week "First Half" plan as the minimum timeline.
What is a good half marathon time based on my 10K time?
Multiply your 10K time by 2.22 to 2.25 for a realistic half marathon estimate. A 50-minute 10K predicts approximately 1:51 to 1:52 half marathon. A 55-minute 10K predicts roughly 2:02 to 2:04. A 60-minute 10K predicts about 2:13 to 2:15. These estimates assume consistent training and proper pacing on race day.
Do I need to take energy gels during a half marathon?
Yes. Unlike a 10K, a half marathon depletes your glycogen stores significantly. Most runners benefit from one gel at mile 5 and another at mile 9 to 10. Start practicing gel intake on training runs longer than 75 minutes. Take gels with water, not sports drink, to avoid stomach issues.
What is the biggest difference between training for a 10K and a half marathon?
The long run. In 10K training, your longest run might be 7 to 8 miles. For a half marathon, you need to build up to 11 to 12 miles. This changes everything: you need to fuel during runs, your recovery takes longer, and mental endurance becomes a factor. The training volume increase is typically 30 to 50% higher than 10K training.
Should I run the full 13.1 miles in training?
No. Most half marathon plans peak at 11 to 12 miles for the longest training run. Race day adrenaline, taper, and the energy of the event will carry you the extra 1 to 2 miles. Running the full distance in training adds unnecessary fatigue and injury risk.
How should I pace my first half marathon compared to my 10K pace?
Your half marathon pace should be approximately 20 to 30 seconds per mile slower than your 10K pace. If you run a 10K at 8:30 per mile, target 8:50 to 9:00 per mile for the half marathon. Starting at your 10K pace is the most common mistake first-time half marathoners make.
Do I need to change my running shoes for the half marathon?
Not necessarily, but check the mileage on your current shoes. If they have more than 300 miles, replace them 3 to 4 weeks before race day so you can break in the new pair. The half marathon puts more stress on your feet than a 10K, so cushioning matters more at this distance.
