# Peasy Math > Math tools made easy. Peasy Math provides free browser-based tools at https://peasymath.com/. All processing happens client-side — files never leave your device. ## Tools (15) - [Percentage Calculator](https://peasymath.com/math/percentage-calculator/) — Calculate percentages, increases, decreases, and ratios - [Ratio Calculator](https://peasymath.com/math/ratio-calculator/) — Simplify, scale, and find equivalent ratios - [Average Calculator](https://peasymath.com/math/average-calculator/) — Calculate mean, median, mode, range, and standard deviation - [GCD & LCM Calculator](https://peasymath.com/math/gcd-lcm-calculator/) — Find greatest common divisor and least common multiple - [Prime Number Tools](https://peasymath.com/math/prime-number-tools/) — Check, factorize, generate, and find prime numbers - [Equation Solver](https://peasymath.com/math/equation-solver/) — Solve linear and quadratic equations step by step - [Unit Converter](https://peasymath.com/math/unit-converter/) — Convert between length, weight, temperature, volume, and more - [Fraction Calculator](https://peasymath.com/math/fraction-calculator/) — Add, subtract, multiply, divide, and simplify fractions - [Roman Numeral Converter](https://peasymath.com/math/roman-numeral-converter/) — Convert between Roman numerals and decimal numbers - [Fibonacci Calculator](https://peasymath.com/math/fibonacci-calculator/) — Generate sequences, find nth terms, and check Fibonacci numbers - [Logarithm Calculator](https://peasymath.com/math/logarithm-calculator/) — Calculate log₁₀, ln, log₂, and custom base logarithms - [Statistics Calculator](https://peasymath.com/math/statistics-calculator/) — Mean, median, mode, standard deviation, and more - [Number Base Converter](https://peasymath.com/math/number-base-converter/) — Convert between binary, octal, decimal, hex, and any base - [Matrix Calculator](https://peasymath.com/math/matrix-calculator/) — - [Trigonometry Calculator](https://peasymath.com/math/trigonometry-calculator/) — ## Guides (28) - [How to Generate Strong Random Passwords](https://peasymath.com/guides/generate-strong-random-passwords/) — Password generation requires cryptographic randomness and careful character selection. This guide covers the principles behind strong password generation, entropy calculation, … - [Password Strength Analysis: How Strong Is Your Password Really?](https://peasymath.com/guides/password-strength-analysis-guide/) — Learn the science behind password strength meters and entropy calculations. Understand what makes a password truly secure, how attackers crack … - [Advanced Markdown: Tables, Footnotes, Task Lists, and Extensions](https://peasymath.com/guides/advanced-markdown-tables-footnotes-extensions/) — Go beyond basic Markdown with advanced features supported by major platforms. Covers GFM tables, footnotes, task lists, math notation, Mermaid … - [Percentage Calculation Formulas and Real-World Applications](https://peasymath.com/guides/percentage-calculation-formulas/) — Percentages appear everywhere: discounts, tax rates, growth metrics, and exam scores. This guide covers the three core formulas and common … - [Password Strength and Generation: A Security Guide](https://peasymath.com/guides/password-strength-generation-guide/) — Weak passwords remain the leading cause of account breaches. This guide covers password entropy calculation, generation strategies, and storage best … - [Compound Interest: The Math Behind Wealth Building](https://peasymath.com/guides/compound-interest-calculation-guide/) — Compound interest is the most powerful concept in personal finance. Understanding the formula and its variables helps you plan savings, … - [BMI and Health Metric Calculations: A Practical Guide](https://peasymath.com/guides/bmi-health-metric-calculations/) — Body Mass Index and related health metrics provide quick screening tools. This guide covers the formulas, their limitations, and more … - [Percentage Calculations: Common Formulas and Pitfalls](https://peasymath.com/guides/percentage-calculations-guide/) — Percentage calculations appear simple but hide common errors, especially around percentage change, percentage points, and compound percentages. This guide clarifies … - [How to Generate Color Palettes Programmatically](https://peasymath.com/guides/generate-color-palettes/) — Algorithmic color palette generation creates harmonious color schemes from a single base color. Learn the math behind complementary, analogous, and … - [Troubleshooting Floating-Point Precision Errors](https://peasymath.com/guides/troubleshooting-floating-point-precision/) — Floating-point arithmetic produces surprising results that can cause bugs in financial calculations, comparisons, and cumulative operations. This guide explains why … - [Statistics for A/B Testing: Confidence Intervals and Sample Sizes](https://peasymath.com/guides/statistics-ab-testing/) — Proper statistical methodology is essential for valid A/B test results. This guide covers confidence intervals, sample size calculation, and common … - [How to Calculate Compound Interest and Loan Payments](https://peasymath.com/guides/how-to-calculate-compound-interest/) — Understanding compound interest is essential for financial planning. Learn formulas for savings growth, loan amortization, and investment returns. - [Troubleshooting Percentage Calculation Errors](https://peasymath.com/guides/troubleshooting-percentage-errors/) — Percentage calculations are deceptively simple but commonly done wrong. Learn to avoid the most frequent percentage calculation mistakes. - [How to Calculate and Improve Engagement Metrics](https://peasymath.com/guides/how-to-calculate-improve-engagement-metrics/) — Calculate engagement rate, reach, impressions, and other social metrics with formulas and improvement strategies. - [Financial Calculations: Compound Interest, Amortization, and NPV](https://peasymath.com/guides/financial-calculations-compound-interest-npv/) — Financial math underlies investment decisions, loan comparisons, and business valuations. Master the core formulas and learn how to apply them … - [CSS Selector Specificity Deep Dive](https://peasymath.com/guides/css-selector-specificity-deep-dive/) — Master CSS specificity calculation, understand the cascade, and avoid specificity wars in large projects. - [File Size Calculation and Data Storage Units](https://peasymath.com/guides/file-size-calculation-data-storage-units/) — Convert between bytes, kilobytes, megabytes, and understand the difference between binary and decimal units. - [Mathematical Notation in Digital Documents](https://peasymath.com/guides/mathematical-notation-digital-documents/) — Display math equations correctly in web pages, documents, and presentations using LaTeX and MathML. - [Typography Scale: Choosing Type Sizes for UI Design](https://peasymath.com/guides/typography-scale-choosing-type-sizes-ui/) — Build a harmonious type scale using mathematical ratios for readable, consistent interfaces. - [Secure Random Number Generation: When Math.random() Isn't Enough](https://peasymath.com/guides/secure-random-generation-guide/) — Math.random() is fine for shuffling a playlist but dangerous for passwords, tokens, and cryptographic applications. Learn when and how to … - [Troubleshooting Floating-Point Precision Errors](https://peasymath.com/guides/troubleshooting-floating-point-precision-errors/) — Understand why 0.1 + 0.2 ≠ 0.3 in computers and how to handle precision issues in calculations. - [Fluid Typography with clamp(): A Modern CSS Approach](https://peasymath.com/guides/fluid-typography-clamp-modern-css/) — Implement responsive typography that scales smoothly between viewport sizes using CSS clamp(). Covers the math behind fluid type scales, accessibility … - [Secure Password Generation: Algorithms and Best Practices](https://peasymath.com/guides/secure-password-generation-algorithms/) — Explore the cryptographic random number generators behind secure password creation. Learn why Math.random() is never sufficient, how CSPRNG works, and … - [Financial Ratios and Business Calculations Explained](https://peasymath.com/guides/financial-ratios-business-calculations/) — Financial ratios distill complex business data into comparable metrics. This guide covers the key ratios investors and managers use to … - [Area and Volume Formulas: A Complete Quick Reference](https://peasymath.com/guides/area-volume-formulas-reference/) — From calculating room paint coverage to sizing shipping containers, area and volume formulas are essential everyday math. This reference covers … - [Significant Figures and Rounding Rules for Accurate Results](https://peasymath.com/guides/significant-figures-rounding-rules/) — Significant figures communicate the precision of a measurement. Incorrect rounding can introduce errors that compound through calculations. This guide covers … - [Time Zone Math and Date Calculations Explained](https://peasymath.com/guides/time-zone-math-date-calculations/) — Time zone conversions, daylight saving transitions, and date arithmetic are notoriously error-prone. This guide covers the rules and edge cases … - [Hash Function Mathematics: How Hashing Works Under the Hood](https://peasymath.com/guides/hash-function-mathematics-explained/) — Hash functions map arbitrary data to fixed-size outputs. Understanding the math behind hashing explains why collisions happen, why hashes are … ## Glossary (48 terms) - [Bayes' Theorem](https://peasymath.com/glossary/bayes-theorem/) — A formula for updating the probability of a hypothesis given new evidence, foundational to statistical … - [Big O Notation](https://peasymath.com/glossary/big-o-notation/) — A mathematical notation describing the upper bound of an algorithm's time or space complexity as … - [Binomial Distribution](https://peasymath.com/glossary/binomial-distribution/) — A discrete probability distribution modeling the number of successes in a fixed number of independent … - [Boolean Algebra](https://peasymath.com/glossary/boolean-algebra/) — A branch of algebra operating on true/false values using AND, OR, NOT operators, foundational to … - [Combination](https://peasymath.com/glossary/combination/) — A selection of elements without regard to order — n choose r equals n!/[r!(n-r)!]. - [Complex Number](https://peasymath.com/glossary/complex-number/) — A number of the form a + bi where i is the imaginary unit (square … - [Correlation](https://peasymath.com/glossary/correlation/) — A measure of the linear relationship between two variables, ranging from -1 (inverse) to +1 … - [Cross Product](https://peasymath.com/glossary/cross-product/) — An operation on two 3D vectors producing a vector perpendicular to both, with magnitude equal … - [Derivative](https://peasymath.com/glossary/derivative/) — The instantaneous rate of change of a function with respect to its variable, representing the … - [Determinant](https://peasymath.com/glossary/determinant/) — A scalar value computed from a square matrix that indicates whether the matrix is invertible … - [Dot Product](https://peasymath.com/glossary/dot-product/) — An operation on two vectors returning a scalar equal to the sum of element-wise products, … - [Eigenvalue](https://peasymath.com/glossary/eigenvalue/) — A scalar that, when a matrix is applied to its eigenvector, scales the vector without … - [Entropy (Information)](https://peasymath.com/glossary/entropy-information/) — A measure of uncertainty or information content in a dataset, calculated as the negative sum … - [Euler's Number](https://peasymath.com/glossary/eulers-number/) — The mathematical constant e (approximately 2.71828), the base of natural logarithms, central to calculus and … - [Exponential](https://peasymath.com/glossary/exponential/) — A function where the variable appears as an exponent (e.g. e^x), modeling rapid growth or … - [Factorial](https://peasymath.com/glossary/factorial/) — The product of all positive integers up to n (e.g. 5! = 120), used in … - [Fibonacci Sequence](https://peasymath.com/glossary/fibonacci-sequence/) — A sequence where each number is the sum of the two preceding ones (0, 1, … - [Fourier Transform](https://peasymath.com/glossary/fourier-transform/) — A mathematical operation decomposing a signal into its constituent frequencies, fundamental to audio and image … - [GCD](https://peasymath.com/glossary/gcd/) — The largest positive integer that divides two or more numbers without leaving a remainder. - [Gradient](https://peasymath.com/glossary/gradient/) — A vector of partial derivatives indicating the direction and rate of steepest ascent of a … - [Hamming Distance](https://peasymath.com/glossary/hamming-distance/) — The number of positions at which corresponding bits or symbols of two equal-length strings differ, … - [Integral](https://peasymath.com/glossary/integral/) — The accumulation of a quantity over an interval, geometrically representing the area under a curve. - [Interpolation (Math)](https://peasymath.com/glossary/interpolation-math/) — Estimating unknown values between known data points using methods like linear, polynomial, or spline interpolation. - [LCM](https://peasymath.com/glossary/lcm/) — The smallest positive integer that is divisible by two or more given numbers. - [Least Squares](https://peasymath.com/glossary/least-squares/) — A curve-fitting method that minimizes the sum of squared differences between observed data points and … - [Logarithm](https://peasymath.com/glossary/logarithm/) — The inverse of exponentiation — log base b of x equals the power to which … - [Matrix](https://peasymath.com/glossary/matrix/) — A rectangular array of numbers arranged in rows and columns, used in linear algebra and … - [Mean](https://peasymath.com/glossary/mean/) — The average of a set of numbers, calculated by dividing the sum of all values … - [Median](https://peasymath.com/glossary/median/) — The middle value in a sorted dataset, separating the higher half from the lower half. - [Mode](https://peasymath.com/glossary/mode/) — The most frequently occurring value in a dataset, useful for categorical data where mean is … - [Modular Arithmetic](https://peasymath.com/glossary/modular-arithmetic/) — A system of arithmetic where numbers wrap around after reaching a modulus (e.g. 17 mod … - [Monte Carlo Method](https://peasymath.com/glossary/monte-carlo-method/) — A computational technique that uses repeated random sampling to estimate numerical results for problems that … - [Newton's Method](https://peasymath.com/glossary/newtons-method/) — An iterative algorithm for finding roots of equations by successively improving an estimate using the … - [Normal Distribution](https://peasymath.com/glossary/normal-distribution/) — A symmetric bell-shaped probability distribution where about 68% of values fall within one standard deviation … - [Percentile](https://peasymath.com/glossary/percentile/) — A value below which a given percentage of observations fall (e.g. 95th percentile means 95% … - [Permutation](https://peasymath.com/glossary/permutation/) — An ordered arrangement of elements — the number of permutations of n items taken r … - [Pi](https://peasymath.com/glossary/pi/) — The mathematical constant representing the ratio of a circle's circumference to its diameter, approximately 3.14159. - [Prime Number](https://peasymath.com/glossary/prime-number/) — A natural number greater than 1 divisible only by 1 and itself (e.g. 2, 3, … - [Probability Distribution](https://peasymath.com/glossary/probability-distribution/) — A mathematical function describing the likelihood of different outcomes in a random experiment (e.g. normal, … - [Pythagorean Theorem](https://peasymath.com/glossary/pythagorean-theorem/) — The relation a^2 + b^2 = c^2 in a right triangle, where c is the … - [Radians](https://peasymath.com/glossary/radians/) — An angle measurement where one radian equals the angle subtended by an arc equal in … - [Regression](https://peasymath.com/glossary/regression/) — A statistical method for modeling the relationship between a dependent variable and one or more … - [Set Theory](https://peasymath.com/glossary/set-theory/) — A branch of mathematics studying collections of objects, with operations like union, intersection, and complement. - [Sigmoid Function](https://peasymath.com/glossary/sigmoid-function/) — An S-shaped function mapping any real number to a value between 0 and 1, widely … - [Standard Deviation](https://peasymath.com/glossary/standard-deviation/) — A measure of how spread out values are from the mean — low values indicate … - [Taylor Series](https://peasymath.com/glossary/taylor-series/) — An infinite sum of polynomial terms that approximates a function around a point, used in … - [Variance](https://peasymath.com/glossary/variance/) — The average of squared deviations from the mean, measuring how far data points spread from … - [Z-Score](https://peasymath.com/glossary/z-score/) — The number of standard deviations a data point lies from the mean, used to compare … ## API Base URL: https://peasymath.com/api/v1/ | Endpoint | Description | |----------|-------------| | GET /api/v1/tools/ | List all tools (filterable by category) | | GET /api/v1/tools/{slug}/ | Tool detail with description, steps, FAQ | | GET /api/v1/categories/ | Tool categories | | GET /api/v1/formats/ | File formats reference | | GET /api/v1/conversions/ | Format conversion guides | | GET /api/v1/glossary/ | Terminology definitions | | GET /api/v1/glossary/{slug}/ | Term with simple + technical explanations, code examples, references | | GET /api/v1/guides/ | Educational guides (filterable by category, audience_level) | | GET /api/v1/guides/{slug}/ | Full guide with content, takeaways, ToC, related guides | | GET /api/v1/use-cases/ | Real-world use cases | | GET /api/v1/search/?q={query} | Cross-model search | | GET /api/v1/sites/ | All 16 Peasy sites | OpenAPI spec: https://peasymath.com/api/openapi.json Swagger UI: https://peasymath.com/api/docs/ ## Content Negotiation All pages support Markdown output for AI agents: - Add `?format=md` to any page URL - Or send `Accept: text/markdown` header ## Platform Stats - 251 tools across 16 sites - 131 file formats documented - 1484 format conversion guides - 695 glossary terms - 645 educational guides - 302 real-world use cases Full catalog: https://peasymath.com/llms-full.txt