Pace Calculator
Convert finish times to pace per km or mile. Get split times for any distance from 1K to marathon.
Calculate pace →Free tools for runners and CrossFit athletes — calculate your pace, find your zone 2 heart rate, and generate daily workouts.
Convert finish times to pace per km or mile. Get split times for any distance from 1K to marathon.
Calculate pace →Half and full marathon pace reference tables. Look up the pace you need for any target finish time.
View chart →Predict finish times at other distances based on a recent race result using the Riegel formula.
Predict time →All five training zones from recovery to VO2 max. Max HR, Karvonen, or LTHR methods for runners.
View zones →Estimate aerobic capacity (VO2 max) and running performance (VDOT) from a race or Cooper test.
Estimate VO2 max & VDOT →Calculate calories burned based on weight, distance, and pace using MET values.
Calculate calories →Find your aerobic base heart rate zone using age-based or Karvonen formulas. Build endurance the right way.
Find your zone →Generate random AMRAP, EMOM, For Time, and Chipper workouts with your available equipment.
Generate WOD →Most fitness sites give you a calculator and a paragraph of generic advice. PaceWOD is built for athletes who already train with data — Garmin lap splits, COROS training load, Apple Watch HR drift — and need to know which number to trust when they conflict.
Every guide on this site follows the same decision framework: name the method (Riegel, Karvonen, Daniels VDOT, MET), show where wearables introduce error, then give a concrete training action. A race predictor that says 1:42 half marathon means nothing if your last 10K was on a net-downhill course in cool weather — we explain when to adjust the input and when to ignore the output.
Recreational runners building toward a first 5K or a sub-2 half marathon. CrossFit athletes who want conditioning benchmarks beyond the daily whiteboard. Anyone frustrated when "easy pace" on the watch feels impossible on a humid Tuesday — and wants a physiological explanation, not a motivational quote.
PaceWOD is operated independently by an endurance athlete with an engineering background. Read our About page for editorial standards, Privacy Policy for how we handle data, or contact us to report an error in a guide or calculator.
Data-driven articles on running science, heart rate training, and wearable analytics — written for athletes who use Garmin, COROS, and pace data.
Why easy days drift into gray zone — and how LTHR-based zones differ from Garmin defaults.
Read analysis →When watch VO2 lags race fitness, and which interval formats actually move the number.
Read analysis →MET estimates vs Garmin calories — why distance and weight matter more than pace.
Read analysis →Negative splits and checkpoint pacing for 5K through half marathon — with worked split tables.
Read analysis →What pace:HR decoupling means on long runs — and when >5% signals under-fueling or heat stress.
Read analysis →GPS, wrist HR, and training metrics — when Apple Watch is enough and when to switch.
Read analysis →Even splits, fueling checkpoints, and second-half physiology with a sub-4 worked example.
Read analysis →Seiler research with sample weeks at 30, 50, and 70 km — and why gray zone kills the model.
Read analysis →EvoLab vs Training Status, GPS, battery life — which watch fits your training data needs.
Read analysis →First 5K discipline, km checkpoints for 40–55 min, and when to surge in the second half.
Read analysis →Break strategy, time caps, and scaled templates for sustainable For Time pacing.
Read analysis →Load %, volume cuts, and skill substitutions — when Rx hurts the intended stimulus.
Read analysis →Aerobic base and interval formats — when engine, not strength, limits metcon scores.
Read analysis →Unknown workout pacing, heat strategy, and fatigue management across Open weeks.
Read analysis →Metcon calorie estimates vs watch data — and why EPOC afterburn is oversold.
Read analysis →Weekly calorie math, muscle retention, and a hybrid structure that actually moves the scale.
Read analysis →Why Garmin, COROS, and Apple Watch overestimate burn — use MET math instead.
Read analysis →What your watch measures — and when a low HRV means skip the hard session.
Read analysis →Two nights before matters more than race eve — anxiety, travel, and caffeine rules.
Read analysis →How late is too late for metcons — intensity cutoffs that protect next-day performance.
Read analysis →Add speed after easy runs without stacking fatigue — short form-focused reps.
Read analysis →What the score measures — and when to ignore it before a quality session.
Read analysis →Calories and RPM strategy so bike stations don’t wreck the rest of the WOD.
Read analysis →