Sprint Interval Calculator
Calculate HIIT sprint interval workouts with Tabata, Sprint 8, and custom protocols.
Presets
About this tool
High-Intensity Interval Training (HIIT) is one of the most effective ways to build cardiovascular fitness and burn calories in minimal time. The Sprint Interval Calculator helps you structure these intense workouts by calculating precise work and rest intervals for popular protocols like Tabata and Sprint 8. Whether you're training for athletic performance or improving overall fitness, having accurate timing is crucial for maximizing the benefits of each session.
To use this calculator, simply select your preferred HIIT protocol—such as Tabata (20 seconds work, 10 seconds rest), Sprint 8, or create custom intervals with your own work and rest durations. Enter the number of rounds or total duration you want to complete, and the tool instantly shows you the exact timing for each phase. You can then follow along with the generated schedule during your workout, using the intervals to pace your sprints and recovery periods.
This tool is ideal for runners, cyclists, CrossFit athletes, and fitness enthusiasts who want precise workout structure without relying on external apps or timers. The calculator works entirely in your browser, making it quick to access before your workout. Remember that HIIT is demanding on the body, so allow adequate recovery between sessions and consult a fitness professional if you're new to high-intensity training.
Frequently Asked Questions
Code Implementation
import math
def calculate_hiit_session(protocol: str, body_weight_kg: float) -> dict:
"""Calculate HIIT sprint interval session details."""
protocols = {
"tabata": {"sprint": 20, "rest": 10, "sets": 8, "rounds": 1, "rest_between": 60},
"30-60": {"sprint": 30, "rest": 60, "sets": 8, "rounds": 1, "rest_between": 0},
"40-20": {"sprint": 40, "rest": 20, "sets": 8, "rounds": 1, "rest_between": 60},
"sprint8": {"sprint": 30, "rest": 90, "sets": 8, "rounds": 1, "rest_between": 0},
}
p = protocols.get(protocol, protocols["tabata"])
# MET-based calorie estimation
MET_SPRINT = 14.0 # sprint running
MET_WALK = 3.5 # recovery walking
sprint_time_min = (p["sprint"] * p["sets"]) / 60
rest_time_min = (p["rest"] * p["sets"] + p["rest_between"]) / 60
cal_sprint = MET_SPRINT * body_weight_kg * sprint_time_min / 60
cal_rest = MET_WALK * body_weight_kg * rest_time_min / 60
total_cal = cal_sprint + cal_rest
total_time = p["sprint"] * p["sets"] + p["rest"] * p["sets"] + p["rest_between"]
return {
"protocol": protocol,
"sets": p["sets"],
"sprint_sec": p["sprint"],
"rest_sec": p["rest"],
"total_time_sec": total_time,
"calories_burned": round(total_cal, 1),
}
result = calculate_hiit_session("tabata", 70)
print(f"Protocol: {result['protocol']}")
print(f"Sets: {result['sets']} x {result['sprint_sec']}s sprint / {result['rest_sec']}s rest")
print(f"Total time: {result['total_time_sec']}s ({result['total_time_sec']//60}min {result['total_time_sec']%60}s)")
print(f"Estimated calories: {result['calories_burned']} kcal")Comments & Feedback
Comments are powered by Giscus. Sign in with GitHub to leave a comment.