Our running calculators and training calculators are used by thousands of runners and athletes globally; whether to check your running pace, calculate your estimated marathon finishing time, or more.
Running Calculators
Running Pace Calculator
Our straightforward, go-to running pace calculator.
It can be used to convert distance and time to pace, pace and distance to time, and time and pace to distance.
As runners, our standard pace metric tends to be min/mile or min/km: that’s exactly what this calculator works out for you.
Age-Graded Running Performance Calculator
By inputting a previous race time, your age, and your gender, you can:
- Compare your run times to other people regardless of age and gender using the age grade score.
- View the equivalent speed you would have run if you were within the 20-30 age range.
- View your predicted race times for all common race distances.
Marathon Finish Time Predictor
How this one works:
Input a previous running race result or two (from 5k to HM) and rate how difficult you found it, then add in your current weekly mileage – and it’ll give you a scarily-accurate marathon finishing time.
Race Time Prediction Calculator
This calculator works by simply supplying a single previous race result – of any distance – and it’ll give you finishing time estimates for all standard running event lengths, from 5k to 100 miles.
While it’s less detailed than our Marathon Finishing Time predictor above, it gives you estimates using both industry-leading Pete Riegel and David Cameron formulas – and can be a great sense-check for pacing your next race.
Half Marathon Pace Calculator
This calculator gives you your target pace and even time splits for a half-marathon race based on your target race time.
The results are shown in both miles and kilometers.
To achieve your target race time, your average speed needs to be the same as the target pace given by the calculator or faster.
Marathon Pace Calculator
This calculator gives you your target pace and even time splits for a marathon race based on your target race time.
The results are shown in both miles and kilometers.
To achieve your target race time, your average pace needs to be the same as the target pace given by the calculator or faster.
The Rockport Walk Test & Calculator: Calculate Your V02 Max
The Rockport WalkTest, also called the Rockport 1 mile walk test or the Rockport fitness walking test, is a self-administered, submaximal VO2 max test that can help you estimate your V02 max simply by walking 1 mile as fast as possible.
Test your VO2 max with ease by following our measuring instructions and using our calculator to process the results. You can also calculate it yourself and compare your results to others.
Elevation Grade Calculator: Measure Slope Angle & Steepness
This calculator can be used to calculate the elevation grade of a slope based on horizontal distance (run) and vertical distance (rise), providing you with the elevation grade as a decimal, a percentage, and a ratio, in addition to the angle of elevation.
It is useful for runners or athletes who want to calculate the steepness of a particular incline or vertical change.
Health and Fitness Calculators
TDEE Calculator – Calculate Daily Calories Burned
This calculator will estimate how many calories you burn in a day based on your weight, height, age, and activity level.
In addition to telling you how many calories you need to maintain your weight and your BMR, it also tells you how many calories you should eat per day to lose weight or gain weight.
Calories Burned Calculator (Per Activity): 800+ activities
Select your activity from the list of over 800, enter the activity duration and your weight, and the calculator will do the rest.
Body Fat Calculator – Measure Your Body Fat Percentage
To get your result, you’ll need to know your weight and height.
You’ll also need a tape measure to measure your waist and neck circumference, as well as your hip circumference if female.
Ideal Weight Calculator: Calculate Your Healthy Body Weight Range
This calculator estimates your ideal weight and BMI healthy weight range based on your height and gender.
It is very important to note that there is no single ideal weight for a given height, so the ideal weight result given by this calculator should not be considered an absolute goal or target to aim for.
BMI Calculator: Body Mass Index Healthy Weight Assessment
BMI is a general indicator of whether or not someone is a healthy weight relative to their height.
Our calculator shows you your BMI, your BMI health category, where you fall on the BMI scale, and your healthy weight range.
Calorie Calculator – Measure And Plan Your Daily Calorie Intake
This calculator will estimate how many calories you burn in a day based on your weight, height, age, and activity level.
In addition to telling you how many calories you need to maintain your weight, it also tells you how many calories you should eat per day to lose weight or gain weight.
More Running Calculators & Tools
Beyond the core calculators above, Marathon Handbook offers three additional specialized tools that runners and coaches rely on for workout-specific predictions:
- Magic Mile Calculator — Jeff Galloway’s simple 1-mile time-trial method that predicts your 5K through marathon paces.
- Yasso 800s Calculator — Bart Yasso’s famous workout: your average 800m time predicts your marathon finish.
- VO2 Max Calculator — estimate your aerobic capacity from race performances or a sub-maximal field test.
Related Running Hubs
Looking for context to use these calculators? These companion resources help you interpret results and put numbers in perspective:
- Pace Charts For Every Distance — printable pace tables from 1 mile to 100 miles, the perfect companion to the pace calculator.
- Running Benchmarks Hub — average times by age and gender for every common race distance, so you know how your calculator results compare.
- Marathon Handbook Training Plan Database — once you have a goal time from the predictor, find the training plan that matches it.
Calculator FAQ
How accurate are race time predictor calculators?
For trained runners, race time predictors are typically accurate within 5-10% of actual race finish — but only if you input recent race performance from the same training cycle. Predictions from older races, mismatched distances, or low-mileage training periods are less reliable. Use the predictor as a starting point, then validate with a tune-up race 4-6 weeks before your goal event.
Which calculator should I use to set my marathon goal?
Two complementary approaches: use the Marathon Race Time Predictor based on a recent half marathon or 10K result, plus a Yasso 800s workout result for cross-validation. If the two predictions agree within 5 minutes, that range is your realistic goal. If they diverge, your endurance and speed are out of balance and need targeted training.
What is VDOT and how does it relate to these calculators?
VDOT is a runner-fitness score developed by coach Jack Daniels that translates any race time into equivalent times across all distances, plus training paces. Most race time predictors on this page use VDOT or similar math under the hood. The VO2 Max Calculator gives you the closest direct read on your VDOT-equivalent.
Are the calorie-burn calculators accurate?
Calorie-burn calculators based on body weight and pace are accurate to within 10-15% for most runners. Watch-based calorie estimates (Garmin, Apple Watch, Whoop) often vary by 20%+ from each other and from these formula-based calculators. For weight management, use the calculator’s number as a starting estimate and adjust based on actual weight change over 2-4 weeks.
What is the difference between BMI and Body Fat Calculator?
BMI uses height and weight only — fast but doesn’t distinguish muscle from fat. Muscular runners often have a “high” BMI despite low body fat. Body fat percentage (estimated via calipers, bioelectrical impedance, or DEXA scan) is more useful for athletes. Use BMI as a quick screen, body fat percentage for real composition tracking.
