1%
Free tools for distance runners

Built for the 1%
-
and everyone
running toward it.

Only ~1% of people have finished a half marathon or longer. These tools are fast, free and built for that 1%.

Browse Tools Field Notes
6
Free Tools
13.1
Miles Minimum
1%
Of All Runners
The Kit

Tools

01
Pace Calculator
Enter your splits mid-run and instantly see what pace you need across every remaining distance to hit your goal average.
Live
02
Race Predictor
The Riegel formula, done right. Plug in any race result and get realistic finish time predictions across every distance.
Live
03
Training Plan Generator
Answer a few questions about your goal race and current fitness. Get a structured plan you can actually follow.
Coming Soon
04
Taper Calculator
Know exactly when to pull back and by how much. Arrive at the starting line fresh, not flat.
Live
05
HR Zone Calculator
Set your five heart rate training zones from your max HR or lactate threshold. Stop guessing, start training in the right zones.
Live
06
Mileage Ramp Tracker
The 10% rule, visualized. Input your current weekly mileage and see a safe ramp-up schedule to your target volume.
Coming Soon
From the road

Field Notes

Who made this

Built by a runner,
for runners.

I'm a 4× half marathoner based in Eugene, Oregon — one of the greatest running cities in the world. I built these tools because I wanted them mid-race and couldn't find anything that wasn't bloated, ad-covered, or built for casual runners.

Run1% is free. No accounts, no upsells, no cookie banners. Just useful tools for people serious enough to go the distance.

4×
Half Marathon Finishes
1:52
Personal Record
EUG
Eugene, Oregon
100%
Free, Always