What Grade Is 400 out of 500?
The method (works for any score)
Divide your points by the total, multiply by 100, then read the percentage against your school's letter scale. For 400/500 the division is friendly: 400 ÷ 500 = 0.80 → 80%. A mental shortcut for anything out of 500: divide the score by 5 to get the percentage directly (400 ÷ 5 = 80). The percentage is objective; the letter depends on the scale — most U.S. schools use A ≥ 93, A− 90–92, B+ 87–89, B 83–86, B− 80–82, C+ 77–79, C 73–76, C− 70–72, with everything below 60 an F.
Nearby scores out of 500
| Score | Percentage | Letter (plus/minus scale) |
|---|---|---|
| 350/500 | 70% | C− |
| 365/500 | 73% | C |
| 385/500 | 77% | C+ |
| 400/500 | 80% | B− |
| 415/500 | 83% | B |
| 435/500 | 87% | B+ |
| 450/500 | 90% | A− |
| 465/500 | 93% | A |
| 475/500 | 95% | A |
The useful pattern: out of 500, every 5 points equals one percentage point — so the gap between a B− and an A− (80% to 90%) is exactly 50 points of work.
Reusing this for any points-based course
The same arithmetic answers "what grade is X out of Y" for any course that grades on total points. Two things to keep straight. First, mid-semester, divide by points offered so far, not the course's final total — 400 earned when only 460 points have been graded is 87%, a very different story from 80%. Second, letter cutoffs belong to your syllabus, not the internet: if your instructor's scale says B− starts at 82%, then 400/500 is a C+ in that room. Do the division yourself; read the letter off the local scale.
Try it yourself: Percentage Calculator
Any score, any total — get the percentage and letter in one step.
Frequently asked questions
Is 400 out of 500 a good grade?
It's a solid, unambiguous pass — a B− (80%) clears the typical prerequisite and major requirements that demand a C or better. It's also 10 percentage points from an A−, which out of 500 means 50 points of ground to make up.
What do I need on the rest to reach an A− if 400/500 is my current total?
Depends how many points remain. If the course ends at 500, the grade is locked at 80%. If 200 points remain (700 total), you need 0.90 × 700 − 400 = 230 of the remaining 200 — impossible; a B+ (0.87 × 700 = 609, so 209/200) is also out of reach, but a B (83%: 581 − 400 = 181 of 200 = 90.5%) is doable.
Does 80% round up to a B?
80% doesn't need rounding — it's exactly the B− line on the common scale. Rounding questions bite at scores like 79.5%: some instructors round to 80, some truncate. The syllabus (or a direct question to the instructor) is the only real answer.