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Calculators

Race and pace

Pace
Race Predictor
Splits
Negative Split
Age-Graded
Reality Check
Yasso 800s
Run/Walk

Training paces and heart rate

VDOT
Easy Pace
HR Zones
Cadence

Training load and volume

Training Load
Training Volume

Course and conditions

Heat Pace
Grade-Adjusted Pace
Elevation Time Cost
Altitude
Course Planner

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Calculators

Race and pace

Pace Race Predictor Splits Negative Split Age-Graded Reality Check Yasso 800s Run/Walk

Training paces and heart rate

VDOT Easy Pace HR Zones Cadence

Training load and volume

Training Load Training Volume

Course and conditions

Heat Pace Grade-Adjusted Pace Elevation Time Cost Altitude Course Planner

Methodology Create free account

Slow Run Fast

Free running calculators from Slow Run Fast. Connect Strava, Whoop, or Garmin later for training data personalised to you.

Race and pace

Pace Calculator
Race Time Predictor
Split Calculator
Negative Split Planner
Age-Graded Performance Calculator
Goal Time Reality Check
Yasso 800s Calculator
Run/Walk Calculator

Training paces and heart rate

VDOT / Training Pace Calculator
Easy Pace & Zone 2 Calculator
Heart Rate Training Zones Calculator
Cadence & Stride Length Calculator

Training load and volume

Training Load (ACWR) Calculator
Training Volume Race Predictor

Course and conditions

Heat Pace Adjustment Calculator
Grade-Adjusted Pace Calculator
Elevation Gain Time Cost Calculator
Altitude Pace Adjustment Calculator
Course Pace Planner

More

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Methodology
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© 2026 Slow Run Fast. Calculators use standard published formulas and are estimates, not medical or coaching advice.