Lactate Threshold Calculator
Estimate your threshold heart rate from your maximum.
Result
Estimated LTHR
171 bpm
≈ 90% of max HR
Threshold zone
167–175 bpm
What it means
Lactate threshold is the intensity above which lactate starts accumulating faster than your body can clear it — roughly the hardest effort you can hold for about an hour. Your lactate threshold heart rate (LTHR) sits near 90% of your maximum for most trained riders.
For a more accurate LTHR, do a 30-minute solo time trial and take your average heart rate over the final 20 minutes. This estimate is a good starting point until you test.
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