What will race day cost you – or give you?
Your goal time, adjusted for the course, the weather and the race field – with a pace plan for every kilometre.
Major races
Find your race
Upcoming races – zoom in and click a race to open it.
How RaceDayCast works
Pick your race and your goal time. We put the course and the race-day weather on top – and show you
what it means for every kilometre.
Example: Chicago Marathon · goal time 3:30 · typical race-day weather
Your adjusted finish time
Hills, wind and heat rolled into one realistic finish time – and an overall rating of the day.
What each factor costs
Seconds for hills, wind, heat and drafting – explained in plain English, so you know where to push and where to hold back.
See where the course costs you
The route coloured by your pace adjustment: green where you gain time (tailwind, downhill), red where it costs (headwind, climbs).
Race-day weather, hour by hour
Where you'll be on the course each hour – and the temperature, sun and wind you'll meet there.
| km | Split | Pace | Time |
|---|---|---|---|
| 5 | 25:05 | 5:01 | 25:05 |
| 10 | 24:35 | 4:55 | 49:40 |
| 15 | 25:07 | 5:01 | 1:14:47 |
| 20 | 25:28 | 5:06 | 1:40:15 |
| 25 | 25:48 | 5:10 | 2:06:03 |
Splits you can race by
Pace and clock time for every kilometre – faster with a tailwind, a little slower into the wind and up the hills.
Your training, races and level
With Plus: plan your runs with the forecast, upload your runs and races (GPX/FIT) to see your pace per km adjusted for hills and weather, and follow your level in My times. The race time calculator is free for everyone.
Contact us
Questions, ideas or feedback? Write to us and we will reply by email.
Races
See what race day might ask of your pace.
Race time calculator
Enter a recent race time and see what it means for other distances – plus your training paces.
Your race
Your time
h : min : sec
Estimated race times
Want to know what race day will do to it? Pick your race →
Training paces
Based on Jack Daniels' VDOT method. Our threshold is a little lower than VDOT's, closer to Marius Bakken's “golden zone”.
Keep track of your level
Save this time to My times, follow your level over the season and keep your training paces up to date.
My account
Start your log
Add a recent race result below – 5 km, 10 km, half marathon or marathon. Your newest race sets your level, and you can adjust it up or down as your training goes.
Add to your log
Your newest race sets your level. Adjustments after it move the level up or down; a new race starts afresh.
Plan a run
What will today's heat, wind and hills cost you? Choose where and when you run.
Upload a run or a race
GPX or FIT from Garmin, COROS, Polar, Suunto or Strava (Export GPX). We work out your pace adjusted for the hills and the weather at the time. Your GPS track is not stored – only the result.
Your runs
| Date | Run | Distance | Pace | Adjusted for hills & weather |
|---|
No runs yet – upload your first one above.
Race-day weather
Where you gain and lose time
Each bar is one kilometre: above the line is time the course and weather cost you, below is time they give back. Point at a bar to find it on the map and the elevation profile.
3 places that decide your race
Elevation
Move along the profile to see where you are on the map.
Splits
In brackets: seconds slower (red) or faster (blue) than your goal pace – the even pace you would run on a flat course in ideal conditions.
Show details
| Km | Temp | WBGT | Headwind m/s | Elevation | Wind | Drafting | Heat |
|---|
Seconds each factor adds to that kilometre (negative = time saved). WBGT is a combined heat measure of temperature, humidity and sun.