Donation Amount

Select the amount you would like to donate to John Halpern's 75 mi challenge.

$35

$70

$120

$265

$500

OtherSurprise John

Donation Calculator

Calculate your donation based on an amount per-mile John Halpern has committed to ride this September. Your total donation will be the amount you select multiplied by John Halpern's 75 mi challenge goal and will be charged up-front.

$0.30 cents/mi

$0.50 cents/mi

$0.80 cents/mi

$1/mi

$1.50/mi

$2/mi

Donation Total:

$