School Calculators Made Simple

RTE Admission Age Calculator

Check if your child meets the Right to Education (RTE) age criteria for free admission in neighbourhood schools.

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Passing Marks Calculator

Instantly find out the minimum passing marks required in CBSE board exams for Classes 10 and 12 across all subjects.

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School Admission Age Calculator

Determine the right class and school for your child based on their date of birth and state-specific age criteria.

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Age Limit Calculator

Verify if your child meets the CBSE age requirements for Class 1 admission and higher grades as per board norms.

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Marks to Percentage Calculator

Convert your CBSE total marks to percentage with ease — supports Class 10, Class 12, and multiple subjects at once.

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Financial

School Savings Calculator

Estimate how much you could save by choosing 21K School over traditional schooling. Plan smarter for your child's education.

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LKG Age Limit Calculator

Find out whether your child meets the CBSE age requirement for LKG admission based on their date of birth.

Percentage Calculator

Calculate your overall CBSE percentage quickly across all subjects for Class 10 and Class 12 board results.

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Preschool Age Calculator

Check if your child is the right age to start preschool and identify the suitable early-years programme for them.

LKG Age Eligibility Calculator

Verify your child's eligibility for LKG admission as per the age criteria followed by schools across India.

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Revaluation Fee Calculator

Estimate the total CBSE revaluation, rechecking, and answer-sheet fees based on the number of subjects you apply for.

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Grade Eligibility Calculator

Find the right grade for your child from Nursery to Grade 12 based on their date of birth and check admission eligibility instantly.

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Financial

Child Education Plan Calculator

Estimate future education costs and plan how much to save monthly or invest as a lump sum — with inflation and returns factored in.

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Attendance Calculator

Check your current attendance percentage and instantly find out how many classes you can miss — or must attend — to hit your target.

Grade Percentage Calculator

Enter marks for each subject to instantly see per-subject grades and your overall percentage — add or remove subjects as you go.

Percentage Addition Calculator

Add a percentage increase to a base value, or sum two percentages directly. Instant results with two calculation modes.

Binary Addition Calculator

Add binary numbers with carry-over, decimal and hex cross-reference output.

8⁸

Octal Addition Calculator

Add octal (base-8) numbers with decimal and binary output. Validates digits 0–7.

0xF

Hexadecimal Addition Calculator

Add hexadecimal numbers (0–9, A–F) with decimal and binary output.

3.14

Decimal Addition Calculator

Add decimal numbers using the column method with automatic precision and step-by-step breakdown.

Fraction Addition Calculator

Add fractions using the LCD method with GCD simplification. Shows decimal and percentage outputs.

±N

Integer Addition Calculator

Add signed positive and negative integers with expression display and step count.

Long Addition Calculator

Column method long addition for multiple numbers with carry-over and step-by-step breakdown.

BCD

BCD Addition Calculator

Add decimals and display Binary Coded Decimal (BCD-8421) encoding with 4-bit digit groups.

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Time Addition Calculator

Add hours, minutes and seconds with automatic carry-over. Result in hh:mm:ss and total seconds.

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Hours Addition Calculator

Add decimal hours and get a total with hours/minutes/seconds breakdown and total minutes.

Feet & Inches Addition Calculator

Add measurements in feet and inches with automatic carry-over and metric (m/cm) conversion.

[ ]

Matrix Addition Calculator

Add two matrices element by element. Supports 2×2 and 3×3 matrices with live result display.

a/b

Rational Algebraic Expressions Calculator

Add or subtract rational algebraic expressions using the LCD method with step-by-step working.

Elliptic Curve Point Addition Calculator

Compute P+Q on an elliptic curve y²=x³+ax+b mod p using modular arithmetic with full steps.

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A Level Grade Calculator

Calculate A Level grades from UMS marks and get UCAS points instantly.

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IGCSE Grade Calculator

Calculate your overall IGCSE grade across multiple subjects on a A*–G scale.

10th Percentage Calculator (State Board)

Calculate Class 10 state board percentage with custom max marks per subject.

10th Percentage Calculator

Calculate your Class 10 board percentage from marks across all subjects.

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CBSE CGPA to Percentage

Convert CBSE CGPA to percentage using the official CBSE formula (×9.5).

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CBSE Cutoff Calculator

Check if your CBSE Class 12 marks meet cutoff for popular courses.

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CBSE GPA Calculator

Calculate your CBSE CGPA from subject grades using the official grading scale.

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CGPA to Percentage Calculator

Convert CGPA to percentage using standard formula with custom multiplier.

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Days Between Dates Calculator

Find exact days, weeks, months and years between any two dates.

Fraction Calculator

Add, subtract, multiply or divide fractions with GCD simplification.

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GATE Score Calculator

Estimate your GATE score from raw marks using the normalization formula.

GPA Calculator

Calculate semester or cumulative GPA from course grades and credit hours.

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Grade Percentage Calculator

Enter marks per subject to get per-subject grades and overall percentage.

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IB Points Calculator

Calculate your IB Diploma total points from subject grades and bonus points.

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ICSE Percentage Calculator

Calculate ICSE board percentage using best 5 subjects rule.

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IELTS Score Calculator

Calculate IELTS overall band score from all 4 skill scores.

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IGCSE Grades to GPA Converter

Convert IGCSE grades to a US GPA (4.0 scale) for university applications.

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IGCSE Score Calculator

Calculate IGCSE percentage and predicted grade from component marks.

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JEE Advanced Score Calculator

Estimate JEE Advanced total score from Physics, Chemistry and Maths marks.

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Marks Percentage Calculator

Convert marks obtained to percentage instantly for any subject.

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Marks to CGPA Calculator

Convert total marks to CGPA on a 10-point scale using standard conversion.

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Marks vs Percentile Calculator

Convert marks to percentile or percentile to rank using linear approximation.

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Negative Marking Calculator

Calculate your net score with negative marking from correct and wrong answers.

Percentage Increase Calculator

Calculate percentage increase or decrease between two values instantly.

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Percentage to CGPA Calculator

Convert your percentage back to CGPA using standard or custom formula.

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Pomodoro Timer

Stay focused with the Pomodoro technique — 25-minute work sessions with breaks.

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Reading Speed Calculator

Calculate your WPM reading speed and estimate time to read any document.

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Speed Distance Time Calculator

Calculate speed, distance or time — enter any two values to find the third.

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Square Root Calculator

Find square roots, cube roots and nth roots with step-by-step output.

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SSLC Percentage Calculator

Calculate SSLC (Class 10 State Board) percentage across all 6 subjects.

Two Percentage Calculator

Compare two percentages — find what percent A is of B with difference shown.

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UPSC Marks Calculator

Calculate your UPSC Mains total score from Paper I–VII and interview marks.

High School GPA Calculator

Calculate weighted or unweighted high school GPA on a 4.0 scale.

75%

75% Attendance Calculator

Find how many classes you must attend to reach 75% attendance, or how many you can still miss safely.

AVG

Average CGPA Calculator

Calculate average CGPA across semesters instantly and track your overall academic performance.

01x

Binary Multiplication Calculator

Multiply binary numbers with proper carry steps and get equivalent decimal output.

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Bitwise Calculator

Perform AND, OR, XOR, NOT and shifts on binary or decimal values with instant conversion.

CBSE Grade System Calculator

Convert marks to CBSE grades and grade points as per the official school grading system.

CGPA Calculator

Compute CGPA from subject grade points and credits for one semester or multiple terms.

10→4

CGPA to GPA Calculator

Convert CGPA to GPA with common scale conversions used for college applications.

10→8

Decimal to Octal Calculator

Convert base-10 numbers to base-8 instantly with step-by-step division method.

1.0

Floating Point Calculator

Work with floating point values and inspect normalized forms used in computing.

½×

Fraction Multiplication Calculator

Multiply fractions, simplify answers with GCD, and get decimal equivalents instantly.

16→2

Hex to Binary Calculator

Convert hexadecimal digits to binary groups quickly with validated input format.

754

IEEE 754 Calculator

Convert decimal values to IEEE 754 binary floating point representation and back.

Integer Division Calculator

Divide integers and get quotient and remainder with clean long-division style output.

Integer Multiplication Calculator

Multiply positive and negative integers and view sign rules in the final result.

L×

Long Multiplication Calculator

Solve large multiplication problems using the column method with partial products.

A×B

Matrix Multiplication Calculator

Multiply matrices of compatible dimensions and get element-wise calculations instantly.

8→10

Octal to Decimal Calculator

Convert octal numbers to decimal values with place-value expansion support.

v⊥w

Orthogonal Vector Calculator

Check whether vectors are orthogonal and validate using dot-product results.

%→CG

Percentage to CGPA Calculator (CBSE)

Convert percentage to CBSE CGPA using board-aligned conversion rules.

Prime Number Calculator

Check prime numbers quickly and explore factors for composite values.

p/q

Rational Number Calculator

Perform rational number operations with simplification and exact fractional output.

XIV

Roman Numeral Calculator

Convert Roman numerals to numbers and numbers to Roman numerals instantly.

1e9

Scientific Notation Calculator

Convert between decimal and scientific notation for very large or small values.

SG→CG

SGPA to CGPA Calculator

Convert semester GPA values into cumulative CGPA with weighted averaging.

SG%

SGPA to Percentage Calculator

Convert SGPA to percentage quickly using standard conversion formulas.

Addition Calculator

Add numbers quickly with clean output for everyday arithmetic and learning.