Free Online Calculators – Math, Algebra, Physics & GPA

Everyday Mathematics Calculators

Quick, accurate tools for the arithmetic you use every day: percentages, fractions, ratios, averages, powers and roots. Each one shows the working so you can check the method, not just the answer.

Scientific Calculator

Trigonometry, logarithms, powers, roots, memory, degree/radian modes, and calculation history.

Percentage Calculator

Percentage of a number, percentage increase/decrease, change, and percentage difference.

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step working and simplified results.

Decimal Calculator

Decimal arithmetic with configurable rounding and precision settings.

Ratio Calculator

Simplify ratios, compare ratios, and calculate missing values in a proportion.

Proportion Calculator

Solve direct proportions with cross-multiplication steps shown.

Average Calculator

Calculate the arithmetic mean of a list of numbers with a clear explanation.

LCM & GCF Calculator

Find the least common multiple and greatest common factor of integers.

Exponent & Power Calculator

Powers including negative and fractional exponents with domain validation.

Square Root Calculator

Square roots and supported nth roots with proper domain validation.

Algebra & Geometry Solvers

Solve quadratic, linear and simultaneous equations, then move on to coordinate geometry, triangles, circles and the Pythagorean theorem. Every solver lists its steps and flags impossible inputs.

Quadratic Equation Solver

Solve ax² + bx + c = 0 with discriminant, real/complex roots, and worked steps.

Linear Equation Solver

Solve linear equations and identify invalid or non-unique cases.

Simultaneous Equations Solver

Solve 2×2 linear systems using Cramer's rule; detect inconsistent systems.

Slope Calculator

Slope from two points, vertical-line detection, and line equation.

Distance Between Two Points

Coordinate distance using the distance formula with worked steps.

Midpoint Calculator

Find the midpoint coordinates of a line segment.

Triangle Calculator

SSS, SAS, area via Heron's formula, triangle inequality validation.

Area & Perimeter Calculator

Common 2D shapes with shape-specific inputs and formulas.

Circle Calculator

Radius, diameter, circumference, and area from any one known value.

Pythagorean Theorem Calculator

Find a missing side of a right triangle and reject impossible inputs.

GPA, Grade & Academic Calculators

Work out your GPA, CGPA, weighted grade, final exam score or attendance. The GPA tools let you set your own grading scale and credit hours, so they suit the 4.0 scale used by US colleges as well as other systems.

GPA Calculator

Configurable grading scales, course grades, and credit hours.

CGPA Calculator

Calculate cumulative GPA using previous credits and GPA values.

Final Grade Calculator

Course grade from current performance and final-exam results.

Weighted Grade Calculator

Custom assessment categories and weights, even if they don't total 100%.

Exam Percentage Calculator

Calculate percentage from obtained and maximum marks.

Required Exam Score Calculator

Minimum score needed to reach a target grade, including impossible targets.

Grade Point Converter

Letter ↔ percentage ↔ GPA with visible assumptions.

Study Time Calculator

Build a study schedule from your subjects, available hours, and deadlines.

Attendance Calculator

Attendance %, absences, and classes needed to reach a target percentage.

Semester GPA Planner

Model future course grades and credit hours to plan your semester GPA.

Age Calculator

Calculate exact age in years, months, days, hours, and minutes from any date of birth.

Physics Calculators

Formula-based physics tools for mechanics, energy, pressure, density and electricity. Each calculator uses SI units and states its formula, which makes them useful for GCSE, A-level, AP and high-school physics.

Physics Formula Calculator

Organized formula selection for mechanics, energy, density, pressure, and electricity.

Force Calculator (F = ma)

Calculate force using F = ma with proper SI units.

Speed, Distance & Time Calculator

Calculate any one quantity when the other two are known.

Acceleration Calculator

Calculate acceleration from change in velocity over time.

Density Calculator

Calculate density, mass, or volume using consistent units.

Pressure Calculator

Calculate pressure, force, or area with unit conversion support.

Work Calculator

Mechanical work under clearly stated force and displacement assumptions.

Power Calculator

Power using mechanical (W/t) or electrical (V·I) relationships.

Kinetic Energy Calculator

Calculate kinetic energy from mass and speed using KE = ½mv².

Ohm's Law Calculator

Calculate voltage, current, or resistance using V = I × R.

Unit Converters & Statistics

Convert length, weight, temperature, area, volume and speed between metric, imperial and US customary units, then summarise a data set with mean, median, mode and standard deviation.

Unit Converter

Length, mass, temperature, area, volume, speed, and time units.

Length Converter

Convert metric, imperial, and US customary length units.

Weight & Mass Converter

Correct conversion factors and explicit unit labels.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin with absolute-zero validation.

Area Unit Converter

Metric, imperial, and US customary area units.

Volume Converter

Liters, gallons, cubic units, and cooking measures.

Speed Unit Converter

Convert between m/s, km/h, mph, ft/s, and knots.

Time Duration Calculator

Elapsed time, durations, and supported date/time differences.

Mean, Median & Mode Calculator

All three measures of central tendency with no-unique-mode handling.

Standard Deviation Calculator

Population or sample standard deviation per your selection.

Pakistan Student & Mobile Tools

Practical tools built for students and mobile users in Pakistan: resize photos for BISE registration forms and calculate mobile load tax before you subscribe to a package.

Picture Resizer for BISE Forms

Resize & compress photos to 130×130 px JPG under 20 KB for BISE Gujranwala and Punjab board registrations.

Load Tax & Package Calculator

Calculate mobile recharge tax deductions (13.04%) and find the exact reload amount needed to subscribe to any package.

Free Online Calculators with Step-by-Step Solutions

Every calculator on this page is free to use and runs in your browser. There is no signup, and the numbers you type are not stored or tracked. Each tool shows the formula it uses, checks your input for mistakes, and displays the working so you can verify the result and learn the method.

What you can calculate

The collection covers everyday maths (scientific calculator, percentage, fractions, decimals, ratios, LCM and GCF, exponents and roots), algebra and geometry (including the quadratic equation solver with steps, linear and simultaneous equations, slope, distance, midpoint, triangles, circles and the Pythagorean theorem), GPA and grade tools (GPA, CGPA, final grade, weighted grade, required exam score and attendance), physics formulas (force, speed, acceleration, density, pressure, work, power, kinetic energy and Ohm's law) and unit converters and statistics (length, weight, temperature, area, volume, speed, mean, median, mode and standard deviation).

Who these calculators are for

These tools suit students, teachers, parents and professionals. Use them to check homework in algebra or physics, plan your GPA for a US college semester, convert between metric, imperial and US customary units, or revise for GCSE, A-level, AP, SAT and BISE Punjab board exams. Because every answer comes with its steps, they work as a learning aid and not just an answer machine.

Made by teachers

The calculators are created and checked by Muhammad Tayyab (MSc Mathematics, Subject Specialist) and the Hira Science Academy team. They pair well with our free Class 9 notes and Class 10 notes.

New to the collection? Start with the Age Calculator, which gives your exact age in years, months and days. Students in Pakistan can also use the BISE form picture resizer and the mobile load tax calculator.

Frequently asked questions

Are these online calculators really free?

Yes. Every calculator is free to use with no signup, no account and no download. They run in your web browser on a phone, tablet or computer.

Do the calculators show step-by-step working?

Yes. The maths, algebra, geometry and physics calculators show the formula and the steps used, so you can check the method and learn from it instead of just copying an answer.

Is the data I enter stored or sent anywhere?

No. Calculations run in your browser and the values you type are not stored or tracked. Like most websites, we use standard analytics to count page visits.

Can I use the GPA calculator for a 4.0 scale?

Yes. The GPA Calculator lets you set the grading scale, grades and credit hours, so you can use the 4.0 scale common in US colleges or adapt it to another grading system. The CGPA Calculator then combines previous credits with new results.

What is the difference between mean, median and mode?

The mean is the average of all values, the median is the middle value when the data is sorted, and the mode is the value that appears most often. The Mean, Median & Mode Calculator finds all three for any list of numbers.

Which physics formulas are covered?

The physics calculators cover force (F = ma), speed, distance and time, acceleration, density, pressure, work, power, kinetic energy and Ohm's law, plus a multi-formula calculator for mechanics, energy and electricity.

Most popular calculators

🧮 Everyday Mathematics Calculators