Available Tools (10)
Updated for 2026Percentage Calculator
Calculate percentages quickly.
Age Calculator
Calculate age from date of birth.
EMI Calculator
Calculate monthly loan EMI and total interest.
Loan Calculator
Calculate EMI, total interest and total repayment for your loan.
Amortization Calculator
Calculate full monthly loan amortization schedules with principal balance breakdown, interest totals, and CSV export.
GPA Calculator
Calculate college and university semester GPA on a 4.0 scale with weighted course credits and letter grades.
CGPA Calculator
Calculate cumulative grade point average (CGPA) across semesters with credit weighting and percentage conversion.
Marks Calculator
Compute total marks, overall percentage, average scores, and pass/fail status across multiple academic subjects.
Grade Calculator
Calculate weighted course grades, determine needed final exam scores, and convert percentages to letter grades.
Scientific Calculator
Perform advanced mathematics with safe expression evaluation, trigonometric functions, logarithms, powers, factorials, and memory.
About ToolTower Calculators
ToolTower Calculators provide transparent mathematical and financial calculations. All math runs locally in your browser, ensuring your private loan figures, interest rates, and tax calculations remain entirely confidential.
⚡ Client-Side Speed
Built to execute right in your web browser. No queueing behind congested shared servers or waiting for slow downloads.
🔒 Zero-Knowledge Security
Your files, calculations, and data stay on your device. When you close your tab, processing memory is immediately released.