Lactate Curve Calculator
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Free Lactate Threshold Calculator
LT1, LT2 & OBLA from blood lactate step tests — instant training zones
8
Calculators
LT1/LT2
Lactate Analysis
7-zone
Power Zones
Free
Forever
Lactate Threshold Test
Enter your step test data — we'll calculate LT1, LT2 and training zones
Protocol & pre/post values (optional)
Protocol tips — how to enter your test
- Base La= at rest, before test
- Row 1= first workload step
- Lactate column= measured value at sampling time
- Power / HR= intensity of that step
Int.
Power
HR
La
Del
Fill in your lactate test data above, then your curve and thresholds will appear here.
Try the demo data button to see an example →
Lactate Analysis
LT1, LT2, OBLA from blood lactate step tests
Progress Tracking
Track fitness trends across weeks and months
Training Zones
7-zone power, HR and pace zones for every sport
Coach Tools
Manage multiple athletes and share test reports
Ready to track your full training load?
LaChart combines lactate testing, training analytics, Strava sync and coach collaboration in one platform.
