8 interactive fitness calculators with live visualizers · 53 pre-solved reference pages. Eagle-eyed accuracy for every calculation.
8
INTERACTIVE
53
REFERENCE PAGES
100%
ALWAYS FREE
5K Pace Calculator
Calculate 5K pace, finish time, per-km splits, and training paces. Race predictions for 10...
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Half Marathon Pace Calculator
Calculate half marathon pace and finish time for 21.0975 km. Get 5km splits, 6 training zo...
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Heart Rate Training Zones Calculator
Calculate heart rate training zones using % HRmax or Karvonen method. Choose 5-zone, 7-zon...
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Maximum Heart Rate Calculator
Calculate maximum heart rate using 6 formulas: Tanaka, Fox, Gellish, Gulati, Nes, and Oakl...
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One Rep Max (1RM) Calculator
Calculate your one rep max using 7 formulas (Brzycki, Epley, Wathan, Lander, Mayhew). Get ...
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Running Pace Calculator
Calculate running pace, finish time, or speed for any race distance. Convert between min/k...
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Swimming Pace Calculator
Calculate swim pace per 100m or 100y, finish time for any distance, pool laps, and Critica...
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VO2 Max Calculator
Calculate VO2 max using Cooper 12-min run, Rockport walk test, 1.5 mile run, or heart rate...
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Each page below is a pre-solved answer page — no input needed. Every result is verified, includes a detailed breakdown, key facts, and an FAQ. Great for quick lookups and reference.
Every EagleCalculator fitness calculator includes a live real-time visualizer that updates on every keystroke, a full worked example with verified math, and a complete FAQ section. All formulas are verified against official sources. Results are for informational purposes only.
Last updated: April 29, 2026 · 8 interactive + 53 reference pages live · Auto-updates as new calculators are added · Eagle-eyed accuracy for every calculation.