Per IRS Notice 2018-03
2018 standard mileage rates are as follows:
Business use: 54.5 cents/mile
Charitable use: 14 cents/mile
Medical care use: 18 cents/mile
Of course, there's lots of if's, and's & but's associated with business use of the standard mileage rates (no depreciation taken, no fleet use, etc.) The excruciating details are at the notice link above.
As always, please call or email me to discuss how this may or may not apply to your particular situation.