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  • #: 195309
  • Price: $3.99 In Apple Store
  • Category: Health & Fitness
  • Updated: 2008-12-03
  • Current Version: 1.0
  • 1.0
  • Size: 0.20 MB
  • Language: English
  • Seller: George Root
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 2.0 or later
  • © 2008 George Root
  •  Add to Favorite apps



The difficulty of a bike ride is typically expressed by two numbers: the total distance traveled, and the cumulative elevation gain. Over the years there have been various ideas for combining these two numbers into a single estimate of “how difficult” the ride is. For example, is cycling 20 miles on a level road easier or more difficult than climbing 2000 feet? Up until now, it has been difficult to find an answer to questions such as this. BikeEnergy can provide these answers.

The companion app BikePower estimates your instantaneous power output while riding. This app, BikeEnergy, estimates the total energy you expend during the entire ride.

BikeEnergy estimates the total amount of energy (Calories or kJoules) required to ride a bike route characterized by total distance and cumulative and net elevation gains (along with a few other parameters that personalize the results for your specific weight, type of bicycle, and riding speed). Energy is an excellent measure of “difficulty”. A ride that burns up 2000 Calories of energy is in a very real sense more difficult than one that consumes only 1000 Calories. Not only will you feel more tired after a 2000 Calorie ride than after one that burns 1000 Calories, but you will also have to eat more food to replenish your energy stores for your next ride.

Use BikeEnergy to rate your club rides for overall difficulty. Group rides into difficulty categories: 500 Calorie rides, 1000 Calorie rides, 1500 Calories rides, etc.

If you are riding as a means to help control your weight, it is useful to be able to estimate how many Calories your cycling is actually burning up. There is a tendency to over-eat after exercise. BikeEnergy can be a useful tool to help prevent that by providing a realistic estimate of just how many Calories of energy you have actually expended.


• Energy is computed for your specific parameters.

• US or metric units

• Energy calculation includes:

- Cumulative and Net Elevation Gains

- Total Distance Ridden

- Speed on Level Roads

- Uphill energy based on weight of bike + rider

- Wind resistance based on altitude, riding speed, and rider's aerodynamic drag area

- Rolling Resistance of the tires

• Reasonable default values are provided for all parameters

• Complete instructions are provided on the website

• The website provides tutorials on Power and Energy as well as how BikeEnergy works.

The screenshots show:

1: The main display with sliders to vary elevation gain, distance, and speed.

2: The data entry display where you enter values to customize the computations to your specific parameters. Defaults values are given for all parameters and the website explains what everything means. The text near the bottom scrolls to reveal more instructions.

3: Example 1: Climbing 3000 feet expends about 780 Calories or about 2.4 donuts.

4: Example 2: Riding 37 miles at 15 mph on level roads also expends about 780 Calories

5: Example 3: Riding 37 miles including 3000 feet of elevation gain (Examples 1 + 2) expends about 1200 Calories. This is not the sum of Examples 1 & 2. Want to know why? Visit the website.

iPhone Screenshots

BikeEnergy iPhone Screenshot 1
BikeEnergy iPhone Screenshot 2

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Rated 5/5 based on 1 customer reviews.


5/5 stars

Finally an Objective Way to Rate Ride Difficulty

For years my bike club has been rating our rides by giving the total distance and the elevation gain. We have had many discussions about which is harder: a long flat ride or a shorter ride with a lot of climbing. This app finally provides a way to answer that question by estimating the total energy needed to do the ride. It doesn't simply assume that you burn 400 calories an hour when riding your bike. It actually applies physics to figure out how much energy goes into climbing hills and riding on flat roads. True, it's only an estimate, but it's a whole lot better than any previous method. Now, instead of trying to figure out whether a 2B ride is more difficult than a 3A ride, we can be sure that a 1500 calorie ride is probably more difficult than a 1000 calorie ride. Our new members can pretty quickly figure out which rides are for them and which ones aren't.


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The information may be outdated (2011-04-24 22:25:31). For actual information go to iTunes

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