U.S. Postal Service Insurance Rates
Provides coverage against loss or damage up to $5,000 for Parcel Post, Bound Printed Matter, and Media Mail matter as well as merchandise mailed at Priority Mail or First-Class Mail rates. Items must not be insured for more than their value. Insured mail must be presented to a retail employee at a post office or to a rural carrier. For an additional fee, insured mail may be combined with Delivery Confirmation, parcel airlift service (PAL), Signature Confirmation, or special handling. For items insured for more than $50, restricted delivery and return receipt service are also available. The amount of insurance coverage for loss will be the actual value, less depreciation. No claim payments are made for sentimental losses or for any expenses incurred as a result of the loss.
Insurance fees/coverage is in addition to postage cost  
Total Package Value
Insurance cost
$0.01 to $50.00
$50.01 to $100.00
$100.01 to 200.00
$200.01 to $300.00
$300.01 to $400.00
$400.01 to $500.00
you can figure it out from here as the increases are by $100 increments