I would use iCardio (or one of the other Digifit apps) and link it to a polar H7 heart rate monitor. It's $7.99 for the app and about £40 for the HRM which will also link to gym equipment and polar watches. In my opinion worth it.
It has voice updates on kcals if you want it, and the gps will track and draw your route, good times. iCardio Pro version comes with fitness tests too at will increase the accuracy of your target zones.
iCardio will also link to myfitnesspal and add your calories from your workouts to your daily intake, handy.
This is the combo I use, though mine is gym based workouts. I find the kcals to be about as accurate as you're going to get with this type of setup.
Strava is probably the most accurate as it takes your weight, elevation and, where applicable, your bikes weight into account. It's still only an estimate though.
I find with calorie counting it's always best to underestimate the amount of calories burned and overestimate the amount of calories consumed (assuming you want to *lose* weight that is!)
Use these figures, as they're actualy based on some sort of research, although probably still not that accurate, it is stupidly hard if not impossible to measure accurately.
That's for walking, you would need to google and see if you can find the extract for cycling.
MET compendium of physical activities has it as follows. The reason it looks odd, is at slow speeds your effectively stopping all the time, where a little faster your momentum is carrying you forward.
I tend to find Endomondo comes up with pretty reasonable estimates for me. For example, a 65km, 3h20m cycle is reported as just under 1700 calories - 41kcal/mile or 500kcal/hour: https://www.endomondo.com/workouts/361302155/3843833
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