TK
Free · no login · built for the 50+ grid

The Toolkit

Calculators that answer the questions masters athletes actually ask — starting with the big one: "how good is that time, really, at my age?"Plain-language answers, zero spreadsheet homework.

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Signature tool

Age-Graded Calculator

Your race time, adjusted for age. Find out what your 5K would have been at 25 — and what percentage of world-best you're running right now.

Run · TriPreview
P
Coming soon

Race Pace Calculator

Goal time → the exact splits to hit, in min/mi or min/km. Print it, tape it to your forearm, ignore it at mile one like everyone else.

All distances
HR
Coming soon

Heart-Rate Zone Calculator

Your five training zones from max/resting HR — with the masters-age caveats the generic formulas skip.

Z1–Z5
Δ
Coming soon

TSB / Training-Load Explainer

Interactive walk-through of CTL, ATL and TSB — the three numbers that run the Rebuild Log. Drag the sliders, watch the hole dig itself.

Interactive
RF
Coming soon

Race Finder

Search triathlon, trail and adventure races near you — filtered the X60 way: distance, terrain, and "does it have a masters podium."

In the shop
Request line

What should I build next?

These tools get built the same way the site does — in public. Vote on the next one in the Sunday drop.