Part A (hospital insurance) premium:

Most people do not pay a premium with a work history of 40 or more quarters.
If you have 30 - 39 quarters of employment the premium is $227 per month.
If you have less than 30 quarters you pay $413 per month.

Part A Deductible and Co-pays:

Part A Deductible for each benefit period:

Hospital Inpatient Co-pays:
$0 for days 1-60
$335 per day for days 61-90
$670 per day for days 91-150
All costs for all days after 150 (unless you have a Medicare Supplement or certain Medicare Advantage plans.

Skilled Nursing Facility
$0 for days 1-20
$167.50 per day for days 21-100
All costs for all days after 100 (unless you have a Long or Short Term Care policy.

Home Health Care
$0 for home health care services
20% of the Medicare approved amount for durable medical equipment

$0 for hospice care

Late Enrollment Penalty
If you aren't eligible for premium free Part A and you don't buy it when first eligible, your monthly premium may go up 10%. You'll pay this penalty for twice the number of years you could have had Part A but didn't.

Part B (doctor & outpatient insurance) premium:

These amounts are for 2018. If you had Medicare Part B in 2015 or 2016 and your Part B premium was taken out of your Social Security check the amount you pay will increase by an average of $21 for 2018 to around $130. If your Part B coverage began in 2017 your premium will stay the same. The actual amount depends on income.
For 2017; $0.00 per month if your income is below $16,284 (single tax filing status) or $21,876 (joint tax filing status).(There is also an asset test of no more than $7280 single or $10,930 couple) (2018 figures have yet to be released; this page will update when those amounts are known.

$134 per month if your income is below $85,000 (single tax filing status) or $170,000 (joint tax filing status).

Up to $428.6 for high income beneficiaries. Click Here for more info.

Part B Deductible and Co-insurance:

Part B Deductible: $183 per year

Part B Co-insurance:
After your deductible is met, you typically pay 20% of the Medicare approved amount for MOST doctor services (including most doctor services while you're a hospital inpatient), outpatient therapy, and durable medical equipment.