Observed arrival · 2026-08-20
Runners Lab, a Calculator Cabinet for Distance People
A free, no-signup suite of running calculators covering pace, race prediction, training, heart-rate zones, splits, track intervals, and performance.
Why it surfaced
Runners Lab offers a notably broad first release: the page lists calculators from 200m splits and Yasso 800s to age grading, marathon potential, and goal feasibility. It also distinguishes exact arithmetic from model-based estimates and names the formulas behind the latter, including Riegel, Daniels VDOT, Tanaka, Minetti, and WMA age-grading factors.
A free, no-signup suite of running calculators covering pace, race prediction, training, heart-rate zones, splits, track intervals, and performance.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue