Sports & Fitness

One rep max, pace, heart rate zone, and calorie burn calculators.

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One Rep Max (1RM) Calculator

Estimate your one rep max from any weight and rep count. See training percentages for all rep ranges.
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Running Pace Calculator

Calculate running pace from distance and time, or finish time from distance and pace. Preset distances for 5K to marathon.
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Heart Rate Zone Calculator

Calculate training heart rate zones using max HR or Karvonen method. See optimal zones for fat burn and performance.
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Marathon Pace Calculator

Calculate marathon splits and pacing strategy. See pace per mile and key checkpoint times.
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Golf Handicap Calculator

Calculate your USGA handicap index from recent rounds using course rating and slope.
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Batting Average Calculator

Calculate batting average, on-base percentage, and OBP from at-bats, hits, and walks.
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Steps to Calories Calculator

Calculate calories burned from step count based on weight, height, and walking pace.
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Swimming Calories Calculator

Calculate calories burned swimming by stroke, intensity, and duration using MET values.
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Cycling Calories Calculator

Calculate calories burned cycling by speed, duration, and body weight using MET values.
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Hiking Time Calculator

Estimate hiking time from distance and elevation gain using Naismith's rule. See difficulty rating.
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Ski DIN Setting Calculator

Calculate recommended DIN setting based on height, weight, age, and skiing ability.
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Fishing Line Calculator

Get recommended line weight, type, and hook size for your target fish species and method.
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NFL Passer Rating Calculator

Calculate NFL passer rating from completions, yards, touchdowns, and interceptions.
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Fantasy Football Points Calculator

Calculate fantasy football points in PPR scoring from passing, rushing, and receiving stats.
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ERA Calculator (Baseball)

Calculate earned run average from earned runs and innings pitched.
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True Shooting % Calculator

Calculate basketball true shooting percentage from points, FGA, and FTA.
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Pace to Speed Converter

Convert running pace (min/mile) to speed (mph) and see race finish times.
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VO2 Max Calculator

Estimate VO2 max from Cooper test, 1.5 mile run, or Rockport walk test.
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FTP Calculator (Cycling Power)

Calculate cycling FTP and power zones from a 20-minute power test.
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Triathlon Time Calculator

Estimate triathlon finish time from swim, bike, and run splits for sprint to Ironman distances.
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Elo Rating Calculator

Calculate new Elo rating after a chess or game match. See expected score and upset probability.
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Poker Pot Odds Calculator

Calculate pot odds vs hand odds to make optimal call/fold decisions.
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Sports Betting Odds Converter

Convert between American, decimal, and fractional odds. See implied probability and payout.
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Calories Per Step Calculator

Calculate calories burned per step from weight with daily step goal targets.
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Max Heart Rate Calculator

Calculate max HR using standard and Tanaka formulas with training zones.
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Running Calorie Calculator

Calculate calories burned running from distance, weight, and pace.
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Weightlifting Volume Calculator

Calculate total training volume (sets × reps × weight) and tonnage.
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Swim Distance Calculator

Calculate total swim distance from laps and pool length in yards, meters, and miles.
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Exercise Calorie Comparison Calculator

Compare calories burned across 10 exercises at your weight and duration.

About Sports & Fitness Calculators

Sports and fitness calculators turn a workout, a race plan, or a round of golf into numbers you can act on. The One Rep Max (1RM) Calculator estimates your true ceiling on a lift from a lighter set, so you can program training percentages instead of guessing. The Running Pace Calculator and Marathon Pace Calculator translate a goal finish time into a per-mile pace and split checkpoints, which is how most US road runners plan a 5K, half, or 26.2.

The Heart Rate Zone Calculator sets training targets using max-HR or the Karvonen method, aligning effort with the moderate and vigorous intensity bands described in the HHS Physical Activity Guidelines for Americans. The Steps to Calories and Cycling Calories calculators estimate energy burned from MET values, useful for sizing a daily activity goal.

The Golf Handicap Calculator is the most rules-bound tool here: it produces a Handicap Index from your scores using the USGA Course Rating and Slope under the World Handicap System. The Hiking Time Calculator estimates trail duration from distance and elevation gain, handy when planning a National Park outing against daylight.

Frequently Asked Questions

How accurate is a one rep max estimated from a calculator instead of an actual max attempt?
Estimated 1RMs from formulas like Epley or Brzycki are most reliable when the rep count is low, generally under 6 to 8 reps, because accuracy drops as fatigue and form changes compound over higher-rep sets. Two lifters who both bench 185 for 5 reps can have different true maxes depending on muscle fiber type and rep speed. Use the estimate to set training percentages, not to load a record-attempt bar.
What heart rate zone should I train in to burn the most fat?
The so-called fat-burning zone, roughly 60 to 70 percent of max heart rate, burns a higher percentage of calories from fat, but higher-intensity work burns more total calories and more total fat per minute. For weight management, the HHS Physical Activity Guidelines emphasize total weekly minutes of moderate-to-vigorous activity over any single zone. Most heart rate calculators estimate max HR as 220 minus age, though the Tanaka formula (208 minus 0.7 times age) is often more accurate for adults over 40.
How is a golf Handicap Index actually calculated under the World Handicap System?
Your Handicap Index is the average of the best 8 of your most recent 20 Score Differentials, each computed from your adjusted score, the course's USGA Course Rating, and its Slope Rating. You need a minimum of 3 acceptable 18-hole scores to establish an initial index, and posted scores are capped at net double bogey per hole. The result is portable across courses, where it converts to a Course Handicap for the specific tees you play.
How many calories do I really burn per 1,000 steps or per mile walked?
A common estimate is roughly 40 to 50 calories per 1,000 steps, but the real figure scales with body weight, walking speed, and terrain, since heavier individuals and faster paces both raise the MET value used in the calculation. Calorie estimates from steps or distance are approximations, not lab-grade measurements, and fitness trackers can differ by 20 percent or more. The CDC and HHS guidelines frame activity in minutes of moderate effort rather than a fixed daily step number, so treat 10,000 steps as a popular target, not a medical rule.
How does elevation gain change how long a hike takes?
Naismith's rule, the basis for most hiking time estimates, allows about 1 hour per 3 miles on flat ground plus an extra hour for every 2,000 feet of climbing. That formula assumes steady fitness and ignores rest stops, technical footing, heat, and altitude, all of which extend real trail times. When planning a National Park hike, add a buffer and check that your estimated finish leaves daylight, since rangers cite overdue, underprepared hikers as a frequent cause of search-and-rescue calls.