Work out how long on average it takes to paint it and how much paint you used.
(T X HW) + (PC X VP) = how much to charge.
Where:
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The answer will depend on the quality of the paint, the coverage of the paint and the preparation of the surface being painted. The Lowe's paint calculator says primer covers 200 square feet per gallon, and paint covers 350 square feet per gallon. Assuming for a dark surface you need at least 2 coats, and you are only using paint and not primer, and not knowing the type of paint, I would start with 3 gallons to be sure you have enough for 2 coats, and then see how it looks. If you need three coats, you might still have enough.
Cost = Base * Height (both measured in yards).
The coverage of the paint (in volume required per square meter) divided by the price (in the same volume units). Times 2 if you need two coats or recalculate the second coat as it usually requires a little less paint. Plus the cost of other materials, paint brushes/rollers, floor covering, etc) plus the cost of the preparation work and tidying up afterwards plus taxes and plus administration fees for insurance bookkeeping and other overhead.
25 cents per square feet
It can vary widely. Anywhere from .60 per wall area ft for a wash and over coat with 2 coats of a direct to metal paint (DTM) the lightest duty industrial paint, up to $20/ wall area foot for food plant surfacing of block with a epoxy intermediate coat and a urethane top coat.