Weekly Mileage Calculator

The weekly mileage calculator builds a personalised running training plan by combining three pieces of information: your goal race distance, your current fitness level, and how many weeks you have until race day. It uses these inputs to set a target peak mileage, then constructs a week-by-week schedule that safely ramps volume up, inserts scheduled recovery weeks, and tapers you into the race.

The calculator uses a fixed peak-mileage table based on race distance and experience level:

Once your peak mileage is known, the available training time is split into a build phase and a three-week taper. The build phase spans all weeks except the final three (or at least four weeks if your window is very short). Volume increases linearly each week until peak is reached, with every fourth week automatically becoming a recovery week at 80 % of the current mileage accumulation. This cadence — three weeks up, one week back — is one of the most evidence-supported patterns in endurance sport and helps prevent overuse injuries while consolidating aerobic adaptations.

The final three weeks of any training block are reserved for tapering — deliberately reducing volume so your body can absorb the training load, repair micro-damage in muscles, and arrive at the start line feeling fresh and ready to race. The weekly mileage calculator applies three fixed taper percentages based on your peak mileage:

For example, a runner whose peak is 65 km/week would run 49 km in Taper 1, 33 km in Taper 2, and roughly 20 km in race week (including the race itself). This steep step-down mirrors the protocols used by elite coaches and is supported by research showing significant improvements in race performance when volume is cut by 40–60 % in the final two weeks. During the taper, run intensity can be maintained or even slightly increased — it is volume, not effort, that drops.

Runners often experience "taper madness" — restlessness, fatigue, and doubt during this period. These sensations are normal and do not indicate a loss of fitness. Trust the weekly mileage plan and resist the urge to add extra kilometres.

Running mileage is not created equal. The calculator splits your peak weekly volume into three intensity zones, reflecting the polarised or 80/20 approach that is now standard in modern endurance coaching:

• Long Run — 25 % of peak mileage. The cornerstone of any distance training plan. Performed at an easy, conversational pace, the long run develops mitochondrial density, fat-burning capacity, and muscular durability specific to race day demands.
• Easy Runs — 55 % of peak mileage. The bulk of your weekly volume should feel genuinely comfortable. Easy running builds aerobic base, promotes recovery, and allows you to accumulate mileage without excess physiological stress. Most runners run these too fast.
• Quality / Speed Work — 20 % of peak mileage. This category covers tempo runs, interval sessions, strides, and race-pace work. Although it forms only a fifth of total weekly running distance, quality work drives the neuromuscular and lactate-threshold adaptations that directly translate to faster race times.

At a peak of 65 km per week, this breaks down to approximately 16 km of long running, 36 km of easy mileage, and 13 km of quality sessions — a balanced and sustainable weekly running schedule that avoids the trap of running every day at a moderate effort that is simultaneously too hard for proper recovery and too easy for meaningful adaptation.

If you are new to structured training, begin by simply filling the easy-run allocation before adding quality work. Injury risk drops substantially when 80 % or more of your weekly running mileage is performed below the aerobic threshold.

The 10 % rule — never increasing your weekly running mileage by more than 10 % from one week to the next — is perhaps the most widely cited guideline in recreational running. While the calculator uses a linear increase formula rather than a strict 10 % compound rule, the underlying principle is the same: give your connective tissue, bones, and supporting musculature time to catch up with your growing cardiovascular fitness.

Cardiovascular adaptation occurs within days; structural adaptation in tendons and bones takes weeks to months. When runners increase volume too quickly, the heart and lungs are ready but the Achilles tendon, tibial stress responses, and hip flexors are not — the result is the overuse injuries (shin splints, stress fractures, plantar fasciitis) that derail training cycles. The built-in recovery weeks at 80 % of accumulated mileage serve as a buffer, allowing structural tissue to consolidate before the next loading block begins.

Use the current weekly mileage slider honestly. If you have had a recent injury or a lower-mileage month, set your starting point conservatively. A slightly longer build phase with a lower weekly increase is far preferable to an aggressive ramp that requires three weeks off to recover from injury.

Elite runners and their coaches have long understood that consistency — running regularly over months and years without major injury interruptions — produces better long-term results than any single high-mileage training cycle. The weekly mileage calculator is designed to help you stay consistent by keeping your running training volume progression gradual and evidence-based.

The optimal weekly running mileage varies considerably by race distance. A 5K specialist and a marathon runner live in very different training worlds, and using a weekly mileage calculator tuned to your goal event is essential for building the right physiological adaptations.

5K Training Mileage

Despite the 5K's short race distance, competitive runners still need meaningful weekly volume. Beginners targeting their first 5K can prepare effectively on 25 km per week, while advanced 5K runners benefit from peak weeks of 50 km or more to develop the aerobic base that supports faster pace work. Speed sessions (intervals at 3K–5K pace) feature more prominently in 5K training than in longer-distance plans.

10K Training Mileage

The 10K demands a blend of aerobic endurance and lactate-threshold fitness. Intermediate 10K runners typically peak at 45 km per week, incorporating both tempo runs and VO2max intervals. The longer long run (up to 18–20 km) distinguishes 10K training from pure 5K preparation.

Half Marathon Training Mileage

Half marathon training introduces the need for sustained aerobic output over 90 minutes to two hours. Intermediate runners build to 55 km per week, with long runs extending to 20–24 km. At this distance, weekly running volume has a near-linear relationship with finish time, making consistent mileage accumulation critical.

Marathon Training Mileage

Marathon training demands the highest peak mileage of any road race. Advanced marathon runners often peak at 90 km per week or more, and even beginners benefit from reaching 50 km before race day. The marathon-specific long run — typically 29–32 km — is the single most important session in the training cycle and accounts for roughly a quarter of peak weekly volume.