Find the right calculator for your exam board.
Indian CBSE has Best-of-5. IGNOU is 70/30 weighted. UK uses UCAS tariff points. Pakistan boards mark out of 1100. We have a dedicated calculator for each — grouped by region so you can find yours in two clicks.
Indian Boards & Universities
CBSE Best-of-5, IGNOU 70/30 weighted, Class 10 + 12 boards, CGPA 9.5 multiplier.
CGPA to Percentage Calculator
CBSE-style 9.5 multiplier and other 10-scale conversions.
CBSE Percentage Calculator
Official CBSE Best-of-5 logic. Auto-picks your top 5 subject scores.
IGNOU Percentage Calculator
IGNOU 70% Theory + 30% Assignment weighted formula.
10th Class Percentage Calculator
Class 10 / Matric percentage — works for CBSE, ICSE, state boards.
12th Class Percentage Calculator
Class 12 / Inter — stream-aware (Science, Commerce, Arts).
Compound Interest Calculator - SIP, FD, Investment Returns
SIP, FD, and investment returns with year-by-year growth table.
Loan EMI Calculator - Home Loan, Car Loan, Personal Loan
Home loan, car loan, personal loan EMI with amortization schedule.
BMI Calculator - Body Mass Index (Metric & Imperial)
Body Mass Index with Asian-Indian risk thresholds.
Hours Calculator - Time Duration, Work Hours & Study Planner
Time duration, work week payroll, study planner, days between dates.
Height Comparison Calculator - Visual & Celebrity Match
Visual height comparison, celebrity match, and growth tracker.
Tax Calculator - GST, Sales Tax & Reverse Tax
GST, sales tax, and reverse tax — add or extract tax from any amount.
Savings Goal Calculator - Reach Your Financial Targets
How long to reach your savings goal with SIP contributions.
Discount Calculator - Sale Price, GST & Double Discount
Sale prices, double discounts, and GST — Flipkart/Amazon sale ready.
Where does your CBSE percentage actually rank?
We built a free statistical reference page with year-on-year CBSE pass percentage, regional toppers, and subject averages — all from official CBSE press releases.
Open CBSE Results StatisticsPakistan Boards
Matric (SSC) and Intermediate (HSSC) percentage calculators — FBISE, BISE Lahore, Karachi, Rawalpindi.
10th Class Percentage Calculator
Class 10 / Matric percentage — works for CBSE, ICSE, state boards.
12th Class Percentage Calculator
Class 12 / Inter — stream-aware (Science, Commerce, Arts).
FSc / MDCAT detailed guides
Pakistan-specific guides covering the 1100-mark FSc system, MDCAT aggregate weighting, and admissions math.
Open the FSc guideUK & Europe
UCAS tariff points and ECTS credit-transfer for Erasmus+ and UK admissions.
US & Canada
4.0 GPA scale conversions — weighted and unweighted.
GPA to Percentage Converter
4.0 GPA scale to percentage, weighted and unweighted.
Venmo Fee Calculator - Instant Transfer & Sending Fees
Venmo instant transfer, credit card, and business fees.
Tip Calculator - Split Bills & Calculate Tips
Restaurant tip with quick buttons and bill splitting.
Universal Calculators
General percentage math, attendance, weighted grades, age and date utilities.
Attendance Goal Planner
How many classes can you skip? Calculate your eligibility margin.
Target Final Exam Predictor
Same as Marks Needed but with weighted final-exam logic.
Marks to Percentage Calculator
The basic (Obtained ÷ Total) × 100 calculator. Works for any exam.
Weighted Grade Calculator
Custom assignment weights — labs, midterms, finals.
Average Marks Calculator
Mean of any number of subject scores. With weighted-mode toggle.
Marks Needed Calculator
Reverse-solve: 'What do I need on the final to hit X%?'
Percentage Increase Calculator
Track grade improvement, price changes, growth over time.
Percentage Difference Calculator
Symmetric difference between two values (no baseline needed).
Percentage Change Calculator
Old → New change as a signed percentage.
Chronological Age Calculator
Exact years, months, and days from any date of birth.
Age Difference Calculator
Compare two dates of birth precisely.
Date Duration Calculator
Total duration between any two dates.
Split Bill Calculator - Fair & Easy Expense Splitting
Split bills, rent, and expenses fairly — 5 modes.
Caffeine Half-Life Calculator - How Long Caffeine Stays in Your System
Caffeine half-life and optimal sleep cutoff time.
Compound Interest Calculator - SIP, FD, Investment Returns
SIP, FD, and investment returns with year-by-year growth table.
Loan EMI Calculator - Home Loan, Car Loan, Personal Loan
Home loan, car loan, personal loan EMI with amortization schedule.
Tip Calculator - Split Bills & Calculate Tips
Restaurant tip with quick buttons and bill splitting.
BMI Calculator - Body Mass Index (Metric & Imperial)
Body Mass Index with Asian-Indian risk thresholds.
Calorie Calculator - Daily Intake, TDEE & Macros
Daily calorie needs, TDEE, and macro breakdown.
Hours Calculator - Time Duration, Work Hours & Study Planner
Time duration, work week payroll, study planner, days between dates.
Height Comparison Calculator - Visual & Celebrity Match
Visual height comparison, celebrity match, and growth tracker.
Tax Calculator - GST, Sales Tax & Reverse Tax
GST, sales tax, and reverse tax — add or extract tax from any amount.
Savings Goal Calculator - Reach Your Financial Targets
How long to reach your savings goal with SIP contributions.
Derivative Calculator - Step-by-Step Solutions
Free derivative calculator with step-by-step solutions. Find derivatives using power rule, product rule, quotient rule, and chain rule. Evaluate slopes at any point.
Quadratic Formula Calculator - Find Roots & Vertex
Solve any quadratic equation ax²+bx+c=0 instantly. Find roots, discriminant, vertex, and axis of symmetry with step-by-step solutions. Handles real and complex roots.
Square Root Calculator - Simplify Radicals
Calculate square roots with decimal and radical form simplification. Find perfect squares, prime factorization, and nearest perfect squares. Free math tool for students.
Integral Calculator - Definite & Indefinite Integrals
Calculate definite and indefinite integrals with step-by-step solutions. Find area under a curve using the power rule. Free calculus tool for students.
Area Converter - Square Feet, Acres, Hectares
Convert between square feet, acres, square meters, hectares, and more. Visual area comparisons with football fields and courts. Free land measurement converter.
Circle Calculator - Area, Circumference & Diameter
Calculate circle area, circumference, diameter, and radius from any one known value. Includes step-by-step solutions and visual diagram. Free geometry tool.
Mean, Median, Mode Calculator - Statistics Tool
Calculate mean, median, mode, range, variance, and standard deviation from any dataset. Includes box plot visualization and quartiles. Free statistics calculator.
Standard Deviation Calculator - Population & Sample
Calculate population and sample standard deviation with step-by-step solutions. Includes the 68-95-99.7 empirical rule and coefficient of variation. Free stats tool.
Discount Calculator - Sale Price, GST & Double Discount
Sale prices, double discounts, and GST — Flipkart/Amazon sale ready.
The percentage formula, explained
A reference page covering every percentage formula students actually need — built for AI-search and Google AI Overview citations.
Open Percentage Formula referenceA 'percentage calculator' is not one tool — it's twenty tools wearing a trench coat.
Plug the same raw marks into a generic percentage calculator and a CBSE calculator and you can get answers ten points apart. The reason: CBSE drops your weakest subject under the Best-of-5 rule. ICSE keeps all six. IGNOU then weights theory and assignment 70/30. UCAS converts grades to tariff points instead of percentages entirely.
Using the wrong tool is not a small error. Students sometimes apply to colleges with the wrong calculated percentage, get the cut-off wrong, and lose a year. We built one calculator per board logic — and grouped them by region so the right one is the obvious one.
The Trench Truth
Don't wait for your final marksheet. Use the Marks Needed Calculator to back-solve the exact score you need on each remaining paper to hit your target. Strategic calculation beats post-result regret.
Common Questions
Which calculator should I use for CBSE Class 10?
Use the CBSE Percentage Calculator — it applies the official Best-of-5 rule (top 5 subject scores out of your 6). For non-CBSE state boards or ICSE, use the 10th Class Percentage Calculator which lets you add unlimited subjects.
How do I convert my Indian percentage to a US GPA?
First convert percentage to CGPA (divide by 9.5 for CBSE-style boards), then map CGPA to a 4.0 scale GPA. The GPA to Percentage tool does the reverse. For an authoritative explainer, see our blog post on the 9.5 multiplier.
Is there a Pakistan-specific calculator for FSc or Matric?
Yes — the 10th Class Percentage Calculator handles Matric (SSC) and the 12th Class Percentage Calculator handles Intermediate (HSSC) for FBISE, BISE Lahore, Karachi, Rawalpindi and other Pakistan boards. We also have a dedicated FSc percentage guide and an MDCAT aggregate calculator.
Are these calculators private? Do you store my marks?
All calculations run entirely in your browser. Nothing is sent to a server, nothing is stored anywhere — refresh the page and your data is gone. We never see your marks.
How do I know which calculator is most accurate for my situation?
Match the calculator to your exam board, not to a generic 'percentage calculator'. CBSE has Best-of-5; IGNOU has 70/30 weighting; ICSE uses a different formula; ECTS converts via percentile bands. Using the wrong calculator gives wrong numbers.