Grading sports cards is the same decision in every sport: you are buying certainty about condition and the card has to be worth enough more with it to cover the price. What differs by sport is how much certainty is worth, because the gap between grades is wider in some markets than others, and that shows up in the sold prices rather than in any rule.
What a grader is actually selling
A grader examines the card against a published scale, assigns a number, seals it and records a certification number anyone can check. What the buyer is paying for is that the condition is no longer a matter of opinion. Everything else about the process, including the turnaround time and the look of the holder, is secondary to that one function.
The costs, all four of them
The per-card fee for the service level your declared value requires, the per-card extras you tick, the postage to send the package insured, and the insured return the grader charges. The last two are per submission, which is why the cost per card falls sharply as the box fills. Put all four into the grading cost calculator and read the total and the per-card figure.
The hurdle, stated plainly
The cost per card is the amount by which the card must be worth more graded than raw before you are level. Compare that to what the same card actually sells for in a slab at the grade you expect, not at the grade you want, and net of whatever percentage your marketplace takes. The uplift calculator does the subtraction.
Where it usually lands
For most cards the break-even is higher than the card is worth in any grade, which is why the standard advice is that most cards should not be graded. The cards that clear it are the ones where condition swings the price a long way, which in practice means scarce cards in sharp condition with an active market.
Questions people ask about grading sports cards
Is grading worth it for a card I am keeping?
That is a preference, not an arithmetic question. The holder protects the card and the grade records its condition; whether those are worth the fee to you is yours to decide.
Do all sports grade the same way?
The scales and the process are the same; what differs is how much buyers in each sport pay for a high grade, and that is visible in completed sales at each grade.
Can a card be worth less after grading?
Yes. A low grade on a card that looked fine raw can sell for less than the raw card did, and you have paid the fee either way.
How long does it take?
It depends on the service level, and the grade does not change with it. Paying for speed buys time rather than outcome.