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What-If Grade Calculator

Enter each graded slice as percent score and weight percent (for example a 20% quiz). We compute your running weighted average, then solve for the final exam score needed to hit your target—using the same decimal-first habits described in why readable decimals matter.

Plan your target grade

Assignments & exams so far Only rows with both grade and weight filled count toward your current average. Weights can be any positive percents that describe your syllabus (they need not add to 100 until you include the final).

Summary

Current average —
Current letter grade —

Goal

Desired overall percentage after the final (0–100 or higher if your school allows).
Share of the total course grade represented by the final (for example 20 for twenty percent). With your target filled, counted row weights plus this final weight must add to 100% so the calculator can solve for the exam score.

Score needed on final

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Fill rows above, add your target and final weight, then press Calculate.

How the weighted average works

Each counted row contributes grade × weight to the numerator and weight to the denominator. Subject names are optional labels—they never change the math.

  • Letter snapshot — A starts at 90%, B at 80%, C at 70%, D at 60%; below 60% reads as F.
  • Final-weight bridge — We treat your running average as the portion already earned and blend it with the final using the weight you supply.
  • Share your scenario — Use Share Calculation to capture rows and goals in the URL.

FAQ

How is my current average calculated here?

We only include rows where both grade percent and weight percent are filled, then compute Σ(grade × weight) ÷ Σ(weight).

What formula finds the score I need on the final?

With running average C, final weight fraction f, and target T, needed final score x satisfies T = C·(1 − f) + x·f, so x = (T − C·(1 − f)) / f.

Can I share my inputs?

Yes—after you calculate, open Share Calculation to copy a link that restores your rows and goal fields.

Disclaimer. RapidRatio is informational only. It is not academic advice or an official grade report. Policies differ by district—confirm results with your instructor or registrar.