Features

• Dynamic Subject Rows — Add or remove unlimited subjects on the fly; percentage is calculated from total obtained divided by total max, so subjects with different total marks are handled correctly.
• Instant Percentage & Letter Grade — Get percentage and a color-coded grade (A+, A, B, C, D, F) in one click with a clear grading scale (90%+ = A+, 80–89% = A, etc.).
• Detailed Marksheet with Student Info — Optionally fill in student name, school, roll number, class, exam name, year, and DOB to generate a printable-style marksheet with subject-wise breakdown table.
• Multi-Format Export — Copy results to clipboard, download as a text file (Forex-grade-calculator.txt), or export a styled PNG image marksheet using html2canvas.
• Smart Validation & 100% Private — Prevents invalid marks (obtained > total, zero/negative totals) with clear error messages; all processing stays in your browser with zero uploads.