Pace Calculator Calculate running pace, finish time, or distance for training and race planning.
Pace Calculator
Calculate running pace, finish time, or distance for training and race planning.
Choose Calculation
Select whether to calculate pace, finish time, or distance.
Enter Known Values
Input distance and time, or pace and one other value.
View Results
See pace in min/km and min/mile, plus speed in km/h and mph.
What Is Pace Calculator?
The Pace Calculator is a running tool that performs three types of calculations: finding your pace from a distance and time, predicting finish time from a distance and pace, or calculating distance from a pace and time. It supports both metric (km) and imperial (mile) units and includes quick-select buttons for common race distances (5K, 10K, half marathon, full marathon). Pace is displayed in minutes per kilometer and minutes per mile, along with speed conversions. Whether you're training for your first 5K or planning a marathon strategy, this calculator helps you set realistic targets.
Why Use Pace Calculator?
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Three calculation modes: pace, finish time, and distance
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Quick-select buttons for common race distances (5K, 10K, half, full marathon)
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Displays pace in both min/km and min/mile with speed conversions
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Essential for race planning and training target setting
Common Use Cases
Race Planning
Calculate target pace for a goal finish time in any race distance.
Training Zones
Determine pace ranges for easy runs, tempo runs, and intervals.
Progress Tracking
Compare pace across different training sessions and distances.
Race Prediction
Estimate finish time for longer races based on shorter race performance.
Technical Guide
Pace calculations use fundamental relationships: Pace = Time / Distance, Time = Pace × Distance, Distance = Time / Pace. Pace is typically expressed in minutes per unit distance (min/km or min/mi). Speed conversions: km/h = 3600 / (pace in sec/km), mph = 3600 / (pace in sec/mi). The conversion between km and mile paces uses the factor 1.60934 km/mi. For race prediction across distances, more advanced models like the Riegel formula (T2 = T1 × (D2/D1)^1.06) can be used, though this calculator focuses on direct pace/time/distance relationships.
Tips & Best Practices
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1For marathon pacing, aim for even or slightly negative splits (faster second half)
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2Easy runs should typically be 1-2 minutes slower per km than race pace
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3Pace slows naturally with longer distances — a 5K pace is faster than marathon pace
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4Account for elevation, heat, and wind when planning race pace targets
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🔢 Math & CalculatorsFrequently Asked Questions
Q What is a good running pace?
Q How do I convert min/km to min/mile?
Q What pace do I need for a sub-4-hour marathon?
Q Should I run at the same pace for all distances?
Q How does elevation affect pace?
About This Tool
Pace Calculator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.