Every calculator you need in one place
Every tool you need to calculate, at your fingertips. All are 100% FREE and easy to use! Calculate BMI, BMR, body fat, math equations, and more with just a few clicks.
BMI Calculator
Professional BMI calculations with WHO ranges, contextual insights, metric/imperial toggles, and downloadable PDF summaries.
BMR Calculator
Estimate basal metabolic rate and daily calories based on age, gender, weight, height, and activity.
Body Fat Calculator
US Navy method body fat estimation using neck, waist, hip, and height measurements.
Pace Calculator
Calculate running, walking, and biking pace. Multipoint tracking, pace conversion, finish time estimation, and heart rate zones.
Pregnancy Calculator
Estimate pregnancy schedule, due date, and timeline based on due date, last period, conception, ultrasound, or IVF transfer.
Pregnancy Conception Calculator
Estimate conception date based on due date, last period, or ultrasound. Includes conception date range with sperm viability.
Due Date Calculator
Estimate delivery date based on last menstrual period, ultrasound, conception date, or IVF transfer. Includes term classifications.
Pregnancy Weight Gain Calculator
Estimate healthy weight gain schedule based on Institute of Medicine guidelines for your pre-pregnancy BMI.
Target Heart Rate Calculator
Generate custom cardio zones using age formulas, field-test data, and resting heart rate reserve calculations.
Body Type Calculator
Classify body shape, compute waist-hip ratio, and export styling cues using bust, waist, hip, and high-hip measurements.
BAC Calculator
Estimate blood alcohol concentration using the Widmark formula, visualize elimination curve, and download impairment summaries.
GFR Calculator
Estimate glomerular filtration rate with MDRD, CKD-EPI, and Mayo equations, stage CKD, and export nephrology-ready reports.
TDEE Calculator
Compute total daily energy expenditure, calorie targets for cutting/bulking, and macro guidance using multiple BMR formulas.
Carbohydrate Calculator
Convert calorie targets into carb grams per WHO/IOM guidance. Includes weight-loss, maintenance, and gain tables with PDF exports.
Army Body Fat Calculator
Determine compliance with U.S. Army body composition standards using official circumference equations and readiness guidance.
Anorexic BMI Calculator
Screen BMI against anorexia thresholds, read severity guidance, and step through support resources and disclaimers.
Protein Calculator
Turn body weight and training style into protein grams per day with RDA, ADA/CDC guidance, pregnancy tables, and food examples.
Macro Calculator
Create balanced, low-carb, or high-protein macro plans based on your calories, plus food tables and PDF exports.
Conception Calculator
Estimate fertile windows, ovulation days, and due-date projections with probability tables and planning tips.
Period Calculator
Mirror and improve calculator.net with calendar grids, fertile windows, ovulation highlights, and PDF exports.
Basic Calculator
Simple and intuitive basic calculator with memory functions (M+, M-, MR), answer recall (Ans), rounding (RND), sign change (±), and all standard arithmetic operations—the best basic calculator in the world.
Average Calculator
Calculate the average (arithmetic mean) of numbers with comprehensive statistics table including sum, count, median, geometric mean, largest, smallest, and range—the best average calculator in the world.
P-value Calculator
Calculate p-values from Z-scores or vice versa for normal distributions. Includes visual normal distribution curves, left tail, right tail, two-tailed tests, and comprehensive explanations—the best p-value calculator in the world.
Scientific Calculator
Premium keypad with trig, logarithms, degree/radian toggle, memory registers, and calculation history—built to outperform calculator.net.
Log Calculator (Logarithm)
Calculate logarithms with any base including natural log (e). Includes comprehensive educational content covering log rules (product, quotient, power, change of base, reciprocal), formulas, examples, and applications—the best log calculator in the world.
Big Number Calculator
Compute very large numbers with arbitrary precision. Supports integers, decimals, E-notation, and all operations (X+Y, X-Y, X*Y, X/Y, X^Y, √X, X², X!, MOD, GCD, LCM). Includes Powers of 10 chart and comprehensive educational content—the world's best big number calculator.
Matrix Calculator
Perform matrix operations including addition, subtraction, multiplication, division, determinant, inverse, adjugate, trace, transpose, and power operations. Includes comprehensive educational content with all exact formulas—the world's best matrix calculator.
Fraction Calculator
Add, subtract, multiply, divide, simplify, convert to decimals, and work with huge numerators using instant mixed-number output.
Long Division Calculator
Perform long division with step-by-step visual solutions, calculate quotients with remainders, mixed numbers, and decimal results. Includes comprehensive educational content and all division formulas—the best long division calculator in the world.
Percentage Calculator
Solve "what is X% of Y", reverse percent problems, difference, and percentage change with calculator.net-level explanations.
Percent Error Calculator
Calculate percentage error between observed and true values with step-by-step solutions, comprehensive formulas, absolute error, relative error, and educational content—the best percent error calculator in the world.
Random Number Generator
Generate single or bulk random integers/decimals with limit controls, precision, and educational notes about randomness.
Probability Calculator
Solve unions, intersections, complements, XOR expressions, series probabilities, and normal distribution areas with full reference text.
Z-score Calculator
Convert raw scores to z-scores, map z to probability, evaluate two-tail regions, and consult an embedded standard normal table.
Triangle Calculator
Solve triangles from any combo of sides/angles, then review triangle facts, area formulas, medians, inradius, and circumradius.
Pythagorean Theorem Calculator
Calculate the missing side of a right triangle using a² + b² = c². Includes comprehensive educational content, diagrams, formulas, examples, and algebraic proof—the best Pythagorean Theorem calculator in the world.
Greatest Common Factor Calculator
Calculate the GCF of multiple numbers using prime factorization or Euclidean algorithm. Includes step-by-step solutions, comprehensive educational content, formulas, and examples—the best GCF calculator in the world.
Least Common Multiple Calculator
Calculate the LCM of multiple numbers using prime factorization or GCD method. Includes step-by-step solutions showing prime factorization, LCM calculation, and GCD. Comprehensive educational content covering brute force, prime factorization, and GCD methods with examples—the best LCM calculator in the world.
Common Factor Calculator
Find common factors of multiple numbers with step-by-step factor breakdowns, GCF calculation, and comprehensive educational content. Shows all factors for each number and identifies shared factors—the best common factor calculator in the world.
Rounding Calculator
Round numbers to any precision using 8 different rounding methods. Includes round half up/down, round up/down, round half to even/odd, round half away/towards zero, and rounding to fractions—the best rounding calculator in the world.
Scientific Notation Calculator
Convert numbers to scientific notation, E-notation, and engineering notation. Perform arithmetic operations with scientific notation including addition, subtraction, multiplication, division, and powers—the best scientific notation calculator in the world.
Prime Factorization Calculator
Calculate the prime factorization of any number with visual factor tree. Includes trial division method, comprehensive educational content about prime numbers, and prime factorization of common numbers—the best prime factorization calculator in the world.
Factor Calculator
Calculate factors, factor pairs, and prime factorization of any number with visual factor tree. Includes comprehensive educational content about factors, prime factorization, factor trees, and computational complexity—the best factor calculator in the world.
Circle Calculator
Calculate radius, diameter, circumference, and area with comprehensive educational content about circles, parts of a circle, the constant π, and circle formulas—the best circle calculator in the world.
Area Calculator
Calculate areas for rectangles, triangles, trapezoids, circles, sectors, ellipses, and parallelograms with calculator.net-level narratives.
Statistics Calculator
Calculate mean, median, mode, standard deviation, variance, geometric mean, and more. Includes calculator keypad, data visualization charts, and comprehensive educational content—the best statistics calculator in the world.
Standard Deviation Calculator
Compute population/sample σ, view variance, steps, frequency tables, and margin-of-error confidence intervals like calculator.net.
Confidence Interval Calculator
Calculate confidence intervals and margin of error for sample means. Includes step-by-step solutions, error bar visualization, Z-values table, and comprehensive educational content—the best confidence interval calculator in the world.
Permutation and Combination Calculator
Calculate permutations (nPr) and combinations (nCr) for selecting items from a set. Includes step-by-step solutions, formulas, examples, and comprehensive educational content covering permutations, combinations, and their applications—the best permutation and combination calculator in the world.
Number Sequence Calculator
Calculate arithmetic, geometric, and Fibonacci sequences with step-by-step solutions. Includes formulas, examples, and comprehensive educational content covering all sequence types—the best number sequence calculator in the world.
Exponent Calculator
Calculate exponents and solve for base, exponent, or result. Includes step-by-step solutions, all exponent laws and rules with examples, and comprehensive educational content—the best exponent calculator in the world.
Quadratic Formula Calculator
Solve quadratic equations using the quadratic formula. Includes step-by-step derivation, interactive graph visualization, and comprehensive educational content—the best quadratic formula calculator in the world.
Sample Size Calculator
Calculate the minimum sample size needed for your survey or find the margin of error. Includes comprehensive educational content, z-score tables, formulas, and examples—the best sample size calculator in the world.
Surface Area Calculator
Calculate the surface area of common 3D shapes including sphere, cone, cube, cylinder, rectangular tank, capsule, spherical cap, frustum, ellipsoid, and pyramid. Includes formulas, examples, and unit conversion—the best surface area calculator in the world.
Binary Calculator
Perform binary arithmetic and conversions with step-by-step explanations and reference tables.
Hex Calculator
Perform hexadecimal arithmetic operations (add, subtract, multiply, divide) and convert between hex, decimal, and binary. Includes comprehensive educational content, conversion tables, and multiplication table—the best hex calculator in the world.
Half-Life Calculator
Calculate half-life, remaining quantity, mean lifetime, and decay constant with formula references.
Slope Calculator
Find slope from two points or from slope/angle/distance with triangle diagrams and derivations.
Right Triangle Calculator
Calculate all properties of a right triangle from any 2 given values. Includes visual diagram, special right triangles (30-60-90 and 45-45-90), formulas, and comprehensive educational content—the best right triangle calculator in the world.
Root Calculator
Square, cube, and n-th root solver with radical diagrams, estimation walkthroughs, and precision controls inspired by calculator.net.
Mean, Median, Mode, Range Calculator
Analyze datasets with automatic mean, median, mode, range, geometric mean, column charts, and calculator.net reference text.
Ratio Calculator
Solve A:B = C:D proportions, scale ratios up or down, and view aspect-ratio reference tables with calculator.net level detail.
Password Generator
Generate secure, strong, random passwords completely on your device. Never sent across the Internet. Includes password strength indicator, entropy calculator, multiple generation options, password history, and comprehensive security guide. The world's most secure and comprehensive password generator.
Height Calculator
Predict children's adult height using the Khamis-Roche method, parent-based calculations, and growth chart analysis. Includes multiple prediction methods, height converter (US/Metric), and comprehensive educational content. The world's most accurate and comprehensive height prediction calculator.
Age Calculator
Calculate exact age in years, months, weeks, days, hours, minutes, and seconds from birth date to current or specified date. The world's most comprehensive age calculator with PDF export.
Date Calculator
Find the number of years, months, weeks, and days between dates. Add or subtract from a date. Calculate business days, weekend days, and holidays. The world's most comprehensive date calculator with calendar visualizations.
GPA Calculator
Calculate grade point average (GPA) with comprehensive features including GPA planning calculator, settings for different grading scales, AP/IB classes, semester grouping, and past GPA inclusion. Includes detailed grade point equivalents, examples, and guidelines for raising GPA—the world's best GPA calculator.
Conversion Calculator
Convert between commonly used units of length, temperature, area, volume, weight, time, speed, energy, and pressure. Real-time conversions with all units displayed simultaneously. Includes comprehensive educational content about measurement systems. The world's most comprehensive and user-friendly unit conversion calculator.
Voltage Drop Calculator
Calculate voltage drop in electrical circuits using NEC data, estimated resistance, or custom impedance values. Includes comprehensive AWG wire sizes table, educational content about voltage drop causes and consequences, and real-time calculations. The world's most comprehensive and accurate voltage drop calculator.
Square Footage Calculator
Calculate square footage for 9 different shapes including rectangles, circles, triangles, trapezoids, and more. Features multi-national currency support, quantity calculations, unit conversions, and comprehensive educational content about cost per square foot, painting, flooring, and home building. The world's most comprehensive square footage calculator.
The calculator software trusted by millions of users
Professional-grade calculators for all your needs. All tools are 100% free, client-side, and secure. Your data never leaves your device.