Student Tools — NumGenie

Student Tools

Exam-friendly tools: convert percentage to GPA, compute weighted grades and the score you need on finals, solve linear/quadratic equations, and use a simple scientific calculator.

Percentage → GPA

Map a percentage to a GPA scale (4.0 / 5.0 or custom). Linear mapping by default.

Bands (typical): A≥90, B≥80, C≥70, D≥60, else F.

Grade calculator

Enter components (percentage score and weight). We compute the weighted average. Then set a target to see the score needed on the final.

Weights should sum to ≤ 100. If they sum to <100, the remaining weight is assumed for the final exam.

Equation solver

Solve linear (ax + b = 0) and quadratic (ax² + bx + c = 0) equations.

Linear

Quadratic

Scientific calculator

Basic scientific functions: + − × ÷, ^, parentheses, π, e, sin, cos, tan, log, ln, √.

Angles default to radians. Use deg() wrapper for degrees, e.g. sin(deg(30)).

More for students

How to use NumGenie Student Tools (step-by-step)

Follow these quick, reliable workflows to convert percentage to GPA, calculate weighted grades and required finals, solve equations, and evaluate scientific expressions. Mobile-friendly. No sign-up.

1) Percentage → GPA converter

  1. Enter your Percentage (%) score (e.g., 82).
  2. Choose a GPA scale:
    • 4.0 or 5.0 — standard scales.
    • Custom — type your institution’s max GPA (e.g., 7.0).
  3. Select Mapping:
    • Linear — 0% → 0 GPA, 100% → max GPA (most transparent).
    • Bands (A/B/C/D/F) — A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, else F, scaled to the chosen max GPA.
  4. Click Convert to see your GPA to 2 decimal places. Use Clear to reset.

Tip: For official transcripts, always check your university’s published GPA conversion policy.

2) Weighted Grade calculator & “What do I need on the final?”

  1. In Components, enter one line per item as score%, weight%: 
    Quiz 1: 78, 10
Assignment: 85, 25
Midterm: 72, 25
    Labels are optional; the tool reads the first two numbers on each line.
  2. Ensure weights ≤ 100%. Any unused weight is assumed to be the final exam.
  3. (Optional) Enter a Target overall (%) (e.g., 75) to calculate the required final score.
  4. Click Calculate to see:
    • Current weighted percentage based on entered components.
    • Remaining (final) weight.
    • Needed on the final to reach your target (flags if > 100% or already met).
  5. Use Clear to start again.

Pro tip: If your final is not comprehensive, remove components that don’t count toward the final grade structure for a cleaner estimate.

3) Equation Solver (linear & quadratic)

Linear: ax + b = 0

  1. Enter a and b (e.g., a = 2, b = −6).
  2. Click Solve to get x = −b/a.

If a = 0 and b ≠ 0 → no solution. If a = 0 and b = 0 → infinite solutions.

Quadratic: ax² + bx + c = 0

  1. Enter a, b, c (e.g., 1, −3, 2).
  2. Click Solve to see:
    • Two real roots (Δ > 0),
    • One real root (Δ = 0), or
    • Complex roots (Δ < 0) with real ± imaginary parts.

Ensure a ≠ 0 for quadratics; otherwise it’s linear.

4) Scientific calculator (browser-based)

  1. Type your expression (e.g., sin(deg(30)) + sqrt(9) + 2^3) or use the on-screen keypad.
  2. Angles are in radians by default. Wrap degrees with deg():
    • sin(π/6) (radians) ≡ sin(deg(30)) (degrees)
  3. Supported: sin, cos, tan, log (base-10), ln, sqrt, abs, min, max, pow, parentheses, π/PI, e/E, and ^ for exponents.
  4. Click Evaluate (or =) to compute; use ⌫ for backspace and Clear to reset.

Example: 2*sin(deg(30)) + √(9) + 5^2 → 2*0.5 + 3 + 25 = 29.

Best practices for accurate results

  • Use consistent units (e.g., percent for scores/weights, radians vs. degrees for trig).
  • Double-check weights sum to ≤ 100% in the grade calculator.
  • Clear & re-run if you change grading rules or GPA scales.

Troubleshooting

  • “Enter a valid …” message: Make sure fields contain numbers (no stray symbols) and required inputs aren’t blank.
  • Needed final > 100%: Your target isn’t reachable with the remaining weight — adjust target or improve earlier components.
  • Equation errors: For quadratics, ensure a ≠ 0. For scientific input, check brackets and function names.

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