Practical guides that explain what the numbers mean
These guides are written to support the calculators, not compete with them. Start with a race-distance guide if you are training for a specific event, or use the method guides to understand VDOT, race prediction, and pacing decisions.
Strong starting points for half marathon and marathon training
What Is a Good Half Marathon Time? Average Benchmarks, Pace Chart, and Practical Examples
See what a good half-marathon time looks like with benchmark tables, pace formulas, projection examples, and practical race-execution context.
What Is a Good Marathon Time? Average Benchmarks, Pace Chart, and Practical Examples
Understand what a good marathon time looks like using benchmark tables, pace formulas, projection examples, and practical race-execution context.
Distance-specific guides
What Is a Good 5K Time? Average 5K Benchmarks, Pace Chart, and Practical Examples
Get a clear, data-grounded answer to what a good 5K time looks like, with pace formulas, projection examples, benchmark tiers, and practical pacing guidance.
5K Pace Chart: Splits, Finish Times, and Goal Pace Guide
Use this 5K pace chart to convert goal pace to finish time, goal time to pace, and compare practical kilometer and mile splits for common 5K targets.
What Is a Good 10K Time? Average 10K Benchmarks, Pace Chart, and Practical Examples
Get a clear, data-grounded answer to what a good 10K time looks like, with benchmark tables, pace formulas, projection examples, and practical race-execution context.
10K Pace Chart: Splits, Finish Times, and Goal Pace Guide
Use this 10K pace chart to convert goal time to pace, pace to finish time, and compare practical kilometer and mile checkpoints for common 10K targets.
What Is a Good 1 Mile Time? Average Mile Benchmarks, Pace Chart, and Practical Examples
Understand what a good 1-mile time looks like with benchmark tables, conversion formulas, projection examples, and practical pacing context.
What Is a Good 1K Time? Average 1K Benchmarks, Pace Chart, and Practical Examples
Understand what a good 1K time looks like with age-and-ability benchmarks, pace charts, projection formulas, and practical pacing examples.
What Is a Good 2K Time? Average 2K Benchmarks, Pace Chart, and Practical Examples
Get a clear benchmark-driven answer for good 2K times, with conversion formulas, table views, and practical pacing structure.
What Is a Good 3K Time? Average 3K Benchmarks, Pace Chart, and Practical Examples
See what a good 3K time looks like with benchmark tables, pace/speed conversions, projection examples, and practical pacing guidance.
What Is a Good 15K Time? Average 15K Benchmarks, Pace Chart, and Practical Examples
See what a good 15K time looks like with benchmark tables, pace/speed chart views, projection formulas, and practical pacing structure.
What Is a Good 20K Time? Average 20K Benchmarks, Pace Chart, and Practical Examples
Get benchmark-driven 20K context with finish-time tiers, pace and speed chart views, projection examples, and practical pacing guidance.
What Is a Good 25K Time? Average 25K Benchmarks, Pace Chart, and Practical Examples
Understand good 25K performance with benchmark tables, pace charts, projection examples, and practical race execution cues.
What Is a Good Half Marathon Time? Average Benchmarks, Pace Chart, and Practical Examples
See what a good half-marathon time looks like with benchmark tables, pace formulas, projection examples, and practical race-execution context.
Half Marathon Pace Chart: Splits, Finish Times, and Goal Pace Guide
Use this half marathon pace chart to convert goal time to pace, pace to finish time, and compare practical kilometer and mile checkpoints for common half marathon targets.
What Is a Good Marathon Time? Average Benchmarks, Pace Chart, and Practical Examples
Understand what a good marathon time looks like using benchmark tables, pace formulas, projection examples, and practical race-execution context.
How Long Is a 50K? Distance, Finish Times, and Training Requirements
A 50K is 31.07 miles — 4.86 miles beyond a marathon. Learn what that extra distance means physiologically, typical finish times, and how to prepare for your first ultramarathon.
Marathon Pace Chart: Splits, Finish Times, and Goal Pace Guide
Use this marathon pace chart to convert goal time to pace, pace to finish time, and compare practical kilometer and mile checkpoints for common marathon targets.
Sub-3 Hour Marathon Pace Chart: Splits, Pace per Mile, and Pace per Km
Use this sub-3 marathon pace chart to check the exact goal pace and cumulative checkpoint times needed to break three hours.
Sub-3:25 Marathon Pace Chart: Splits, Pace per Mile, and Pace per Km
Use this sub-3:25 marathon pace chart to check the exact goal pace and cumulative checkpoint times needed to break 3 hours 25 minutes.
Sub-3:30 Marathon Pace Chart: Splits, Pace per Mile, and Pace per Km
Use this sub-3:30 marathon pace chart to check the exact goal pace and cumulative checkpoint times needed to break 3 hours 30 minutes.
Sub-4 Hour Marathon Pace Chart: Splits, Pace per Mile, and Pace per Km
Use this sub-4 marathon pace chart to check the exact goal pace and cumulative checkpoint times needed to break four hours.
Sub-6 Hour Marathon Pace Chart: Splits, Pace per Mile, and Pace per Km
Use this sub-6 marathon pace chart to check the exact goal pace and cumulative checkpoint times needed to break six hours.
Guides that explain the formulas and decisions behind the tools
Race Time Predictions: The Science Behind Accurate Forecasting
Learn how to predict race times using VDOT tables and the Riegel formula. Understand the factors that affect accuracy and how to adjust predictions for your training level.
What Is VDOT? How Runners Use It for Training Paces and Race Planning
VDOT is a performance index from Jack Daniels that converts race results into training paces and race predictions. Learn how it works, how to calculate it, and how to use it.
VO2max Explained: What It Measures, Why It Matters, and How Runners Improve It
VO2max is the maximum rate of oxygen your body can use during exercise. Learn what it means for running performance, how it is tested, and how training affects it.
What Is Lactate Threshold? The Runner's Guide to LT Training
Understand lactate threshold (LT1 and LT2), why it matters for race performance, how to estimate yours, and the best workouts to raise it.
What Is Tempo Pace? Workout Guide for Runners
Learn what tempo pace means, how to find yours, the best tempo workout formats, and common mistakes that limit threshold improvement.
Physiology, biomechanics, and performance data
Community, fun, and running lifestyle
Distance conversions and common questions
How Many Miles in a 5K? Exact Answer + What It Means for Runners
A 5K is 3.1 miles (3.10686 mi). Learn what this distance means for beginners and experienced runners, typical finish times, and how to plan your first 5K.
How Many Steps in a Mile? By Height, Walking vs Running
Walking a mile takes about 2,000-2,500 steps. Running takes 1,400-1,700. Use our calculator and table to find your personal steps per mile based on height.
How Far Is 10K in Miles? Exact Conversion + Runner Context
A 10K is 6.2 miles (6.21371 mi). Learn how the 10K differs from a 5K, typical finish times, why it tests lactate threshold fitness, and how to predict longer races from a 10K.
50 Kilometers to Miles: Exact Conversion + Ultramarathon Context
50 km equals 31.07 miles — 4.86 miles beyond a marathon. Learn what this ultramarathon distance demands, typical finish times, and how to convert km to miles.