Points needed for letter grade

The tool multiplies the standard cutoff percentage by the course total, subtracts what you already have, and returns points_needed plus your current percent and letter.

What total-points letter grades mean and how the gap is computed

On a total-points syllabus, the instructor publishes a single course maximum—often five hundred, one thousand, or another round number—and every scored activity contributes raw points toward that ceiling. Letter grades are not guessed from vibes; they are cutoffs expressed as percentages of that same total. If the course is worth one thousand points, an A requires at least nine hundred points, a B at least eight hundred, and so on. Here the only free parameters that move the math are the points you hold, the course total, the target letter, and optionally how many points are still left to earn before the term ends. This endpoint uses the familiar band many North American syllabi still print: A at ninety percent or above, B at eighty, C at seventy, and D at sixty. Given your current_points and total_points, the calculator forms target_points as cutoff percent divided by one hundred times total_points, then sets points_needed to the maximum of zero and target_points minus current_points. When that difference is already non-positive, already_reached is true and points_needed is zero—you are already inside the target band on the course total even if work remains. The response also reports current_percent and current_letter so you can see where you stand today without a separate tool. This is deliberately not a weighted-category grade calculator and not a final-exam-only “what score do I need on the final” solver: those answer different search intents when categories or a single remaining assessment dominate the syllabus.

Input contract, optional remaining points, and error behaviour

If the target is still short even after taking every remaining point, shortfall is the gap that cannot be closed this term under the given remaining budget. POST a JSON body with three required fields: current_points (non-negative finite points already earned), total_points (strictly positive course maximum), and target_letter (one of A, B, C, or D, case-insensitive). Aliases earned, points_earned, and score map to current_points; course_total, max_points, and points_possible map to total_points; target, letter, and grade map to target_letter. Optionally send remaining_points (or points_left, available_points, left) as a non-negative count of points still available from unfinished work. When remaining_points is present, the response adds max_possible_points, max_possible_percent, max_possible_letter, and a boolean reachable: true if current plus remaining meets or exceeds target_points. Missing required fields, non-finite numbers, negative current or remaining points, non-positive total_points, and target letters outside A–D fail with invalid_input and messages that name the field; those validation failures are not billed. On success you also get target_percent, target_points, cutoff_scale text, formula, and method total_points_letter_gap for stable clients and goldens. Example: six hundred fifty current points, one thousand total, target A, three hundred remaining yields target_points nine hundred, points_needed two hundred fifty, reachable true, and a clear plan for the last stretch of the term.

Where a points-needed-for-letter API earns its keep

Keep requests small, pin points_needed and reachable in tests, and you get reproducible total-points letter planning for LMS plugins, edge workers, and classroom demos without standing up custom grading infrastructure of your own.