Free math calculators for percentage, fractions, algebra, statistics, geometry, GPA, logarithms, matrices, and number systems. Step-by-step solutions with formula explanations.
Every calculator on iCalcApp is free with no sign-up, and no data collection. Calculations run instantly in your browser — your inputs are never sent to our servers.
All formulas are reviewed by Mayra, and cross-verified against official sources (RBI, WHO, ICMR, ISO).
iCalcApp math calculators cover percentage, GPA, fractions, averages, standard deviation, probability, square root, exponents, and 8 more. All show step-by-step working so you understand the method, not just the answer. Free for students, teachers, and professionals.
iCalcApp math calculators go further than a physical calculator in three ways: they explain the formula used, they show reference tables of common values (perfect squares, probability examples, fraction equivalents), and they answer follow-up questions via the FAQ section. For quick arithmetic a phone calculator is faster, but for understanding why you get a result, iCalcApp is more useful.
For data analysis: Average Calculator (mean, median, mode, range in one click), Standard Deviation Calculator (spread and variability), Probability Calculator (statistical probability, permutations, combinations), and GPA Calculator (weighted average — the core technique in survey and survey data weighting).
From school homework to engineering checks, the math set includes the area calculator, average calculator, CGPA to percentage, circumference calculator, concrete calculator, discount calculator, exponent calculator, fraction calculator, GPA calculator, LCM-HCF calculator, log calculator, matrix calculator, numerology calculator, percentage calculator, percentage change calculator, probability calculator, quadratic formula calculator, random number generator, roman numeral converter, scientific calculator, significant figures calculator, square footage calculator, square root calculator, standard deviation calculator, triangle calculator, unit price calculator, and the volume calculator. Each opens instantly, calculates in real time as you type, and explains its formula with worked examples below the tool.
Related: percentage change calculator
The Scientific Calculator handles the widest range: arithmetic, trigonometry (sin/cos/tan), logarithms (log/ln), exponents, square roots, factorials, and constants (π, e). For statistics, the Standard Deviation Calculator computes mean, median, mode, variance, and coefficient of variation simultaneously.
Yes — the Fraction Calculator, Standard Deviation Calculator, and GPA Calculator all display the full calculation method. The Fraction Calculator shows LCD, conversion, and simplification steps. The GPA Calculator shows the weighted average formula applied to your specific grades.
Absolutely. The GPA Calculator uses the standard 4.0 scale with letter grade conversion. The Fraction Calculator covers all operations taught in school maths. The Probability Calculator handles GCSE and A-level statistics topics. The Standard Deviation Calculator is suitable from GCSE through undergraduate statistics.
Enter each course's letter grade and credit hours into the GPA Calculator. It applies the weighted average formula: GPA = Σ(grade points × credit hours) ÷ Σ(credit hours). This matches the exact method used by US universities. For percentage-based systems, use the grade-to-GPA conversion table on the calculator page.
Yes — the Scientific Calculator supports all functions needed for basic engineering: trigonometry in both degrees and radians, log and natural log, exponents and nth roots, and standard order of operations (BODMAS). For complex numbers and matrix operations, a specialist tool is needed.
Sources: NIST/SEMATECH e-Handbook of Statistical Methods; Common Core State Standards for Mathematics; ISO 80000 (Quantities and units).
Apply your math skills to money with our finance calculators.
From our blog: Percentage Calculation Guide · Compound Interest Explained
The probability calculator covers single-event probability, compound AND/OR rules, and conditional probability (Bayes' theorem) — one of the most searched math tools on the site. For historical and cultural contexts, the Roman numeral converter handles any value from 1 to 3,999, with full explanation of subtractive notation and modern usage. Need to generate unpredictable values? The random number generator supports custom ranges, multiple numbers, and unique-value sets.
New tools: the matrix calculator handles 2×2 and 3×3 matrix operations including determinant, inverse, and multiplication — essential for engineering and linear algebra students. The percentage change calculator finds the % increase or decrease between any two values.
The percentage calculator handles "X% of Y", "A is what % of B", and percentage increase/decrease. The percentage change calculator specifically measures change over time — salary growth, price increase, stock return. The discount calculator finds sale price, discount amount, and original price from any two values. The unit price calculator compares product value per gram, litre, or unit.
The average calculator computes mean, median, mode, and range. The standard deviation calculator calculates population and sample SD with variance. The probability calculator handles single events, compound AND/OR rules, and conditional probability (Bayes' theorem).
The area calculator covers all shapes: rectangle, circle, triangle, trapezoid, and more. The triangle calculator uses the law of cosines and sines for all triangle types. The volume calculator handles sphere, cylinder, cone, cube, and rectangular prism. The circumference calculator converts between radius, diameter, circumference, and area. The square footage calculator measures rooms and plots in sq ft and m².
The quadratic formula calculator solves ax²+bx+c=0 with discriminant analysis. The matrix calculator handles 2×2 and 3×3 matrix operations. The exponent calculator applies all power rules. The log calculator covers log₁₀, ln, log₂, and any base. The square root calculator finds square, cube, and nth roots. The LCM and HCF calculator uses prime factorisation and the Euclidean algorithm.
The fraction calculator adds, subtracts, multiplies, and divides fractions with LCM. The GPA calculator weights grades by credit hours. The significant figures calculator rounds to the correct precision for science and engineering. The scientific calculator handles sin, cos, tan, log, and complex expressions. The random number generator produces cryptographically secure random numbers.
| Goal | Best Calculator |
|---|---|
| Find percentage change between two values | Percentage Change Calculator |
| Calculate area of any shape | Area Calculator |
| Solve a quadratic equation | Quadratic Formula Calculator |
| Find mean, median, mode of a dataset | Average Calculator |
| Matrix multiplication or determinant | Matrix Calculator |
| Convert Roman numerals | Roman Numeral Converter |
Further reading: Percentage Calculation Guide · Compound Interest Explained