Most exercise burns 6-10 cals per minute. Bike riding is low impact, low intensity, and only uses half your body really (the upper body only stabilises). So it's very low-calorie burn compared to other exercises.
This would suggest it's more the 6cpm range than 10cpm.
So for 35 minutes, you would expect to see maybe 210-280.
This suggests the 307 value to be the most likely reliable one.
116 is 3.3cpm (ha ha, barely "doing nothing" let alone "exercise") and 426 is 12.2cpm (much more a high intensity activity like running - extremely unlikely on a bike).
Rode my bicycle today for 35 minutes. At about 19 km / hour. I filled it in to the Fitness tracker, it says I burned 116 calories. That seems little to me. I used another online list, it says I burned 307. Found another calculator, this one asked about the area, which is hillside. It says I burned 426.
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