Math & Finance
Percentages, conversions, and financial estimates.
Salary Calculator
Convert your salary between hourly, weekly, bi-weekly, monthly, and annual pay. See your gross income breakdown.
Income Tax Calculator
Estimate your 2024 Federal Income Tax. Calculate effective tax rate, tax brackets, and take-home pay based on filing status.
Currency Calculator
Convert between major world currencies (USD, EUR, GBP, JPY, etc.). Instant exchange rate estimates for travelers and shoppers.
Zakat Calculator
Calculate your annual Zakat (2.5%) based on your assets, gold, savings, and liabilities. Supports custom Nisab thresholds.
Dice Roller
Roll virtual dice instantly. Supports D6, D20, D100 and custom sides. Perfect for board games, D&D, and math.
Random Number Generator
Generate random numbers and lists.
Weight Calculator
Convert between weight units like Kilograms (kg), Pounds (lbs), Stones (st), and Ounces. Instant conversion for health and cooking.
Tip Calculator
Calculate gratuity and split the bill between any number of people. Fast and easy tipping.
Fuel Cost Calculator
Calculate the total cost of gas or diesel for a trip. Estimate fuel needed based on distance and MPG.
Grade Calculator
Calculate your current class grade and what you need on the final exam. Supports weighted percentages and point-based grading.
Bandwidth Calculator
Calculate download time for files or data transfer speed. Convert between Mbps, MB/s, and GB instantly.
Mileage Calculator
Calculate gas mileage (MPG) and estimate fuel costs for trips.
Basic Calculator
Simple online calculator.
Conversion Calculator
Convert length, weight, volume, temperature, and more.
GPA Calculator
Calculate college or high school GPA.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Average Calculator
Calculate the mean, median, and sum of a data set.
Standard Deviation
Calculate sample and population SD.
Tile Calculator
Calculate how many tiles you need for floors and walls. Estimate boxes required including waste allowance.
Ohms Law Calculator
Calculate voltage, current, resistance, and power. Find any two variables given the others using Ohm's Law.
Resistor Calculator
Identify resistor values by color bands. Supports 4-band and 5-band resistors with tolerance calculation.
Stair Calculator
Calculate rise, run, and stringer length for building stairs. Optimize step height and tread depth.
Horsepower Calculator
Calculate car horsepower from Torque/RPM or 1/4 mile drag racing times.
Engine Horsepower Calculator
Calculate engine horsepower output from torque and RPM. Useful for engine tuning and performance estimation.
Square Footage Calculator
Calculate sq ft for flooring, painting, and construction. Add multiple rooms and estimate costs.
Voltage Drop Calculator
Calculate voltage drop, percentage loss, and wire size requirements.
Roman Numeral Converter
Convert numbers to Roman numerals and back. Learn the symbols (I, V, X, L, C, D, M) and rules.
Molarity Calculator
Calculate molarity, mass, or volume. Useful for preparing chemical solutions in the lab.
Molecular Weight Calculator
Calculate the molar mass of chemical compounds. Supports complex formulas with parentheses.
Speed Calculator
Calculate Speed, Distance, or Time. Convert between mph, kph, m/s, and knots.
Mass Calculator
Calculate mass, density, or volume. Includes presets for common materials like steel, gold, and water.
Density Calculator
Calculate density, mass, and volume. Convert between kg/mยณ, g/cmยณ, and lb/ftยณ.
GDP Calculator
Calculate Gross Domestic Product using Expenditure and Income methods.
Big Number Calculator
Arithmetic with arbitrarily large integers.
Long Division Calculator
Perform long division with step-by-step tableau.
Matrix Calculator
Perform matrix addition, subtraction, and multiplication.
Common Factor Calculator
Find all common factors of two or more numbers.
Factor Calculator
Find all factors and factor pairs of a number.
LCM Calculator
Calculate Least Common Multiple.
Right Triangle Calculator
Calculate sides and angles of a right triangle.
Surface Area Calculator
Calculate surface area of 3D shapes.
Distance Calculator
Calculate distance between two points (2D & 3D).
Confidence Interval
Calculate CI for sample mean with Z-score.
Permutation & Combination
Calculate nPr and nCr. Order matters vs Order does not matter.
Statistics Calculator
Compute mean, median, mode, SD, and variance.
Sample Size Calculator
Calculate the number of respondents needed for a survey.
Quadratic Formula Calculator
Solve quadratic equations (axยฒ + bx + c = 0) for x.
Log Calculator
Calculate logarithms for any base, including ln and log10.
Hex Calculator
Add, subtract, multiply, and divide hexadecimal numbers.
Exponent Calculator
Calculate powers and exponents ($x^n$).
Number Sequence
Find next terms for Arithmetic, Geometric, and Fibonacci sequences.
Triangle Calculator
Solve for area, angles, and sides of any triangle.
Prime Factorization
Decompose integers into prime factors.
Scientific Notation
Convert decimals to scientific notation and vice versa.
Rounding Calculator
Round numbers to decimal places, nearest multiples, or sig figs.
Greatest Common Factor
Calculate GCF (GCD) of numbers.
Root Calculator
Calculate square roots, cube roots, and nth roots.
Pythagorean Theorem Calculator
Solve for the hypotenuse or missing leg of a right triangle.
Circle Calculator
Calculate radius, diameter, area, and circumference.
Ratio Calculator
Simplify ratios and solve proportions (A:B = C:D).
Z-Score Calculator
Calculate Z-score and probability (percentile).
P-Value Calculator
Calculate P-values from Z, T, Chi-Square, and F statistics.
Mean, Median, Mode, Range
Calculate statistical average, middle, most frequent value, and range.
Probability Calculator
Calculate probability of single or multiple events.
Area Calculator
Calculate area of circles, rectangles, triangles, and more.
Slope Calculator
Calculate slope, distance, and equation of a line.
Half-Life Calculator
Calculate radioactive or drug half-life decay.
Binary Calculator
Add, subtract, multiply, and divide binary numbers.
IP Subnet Calculator
Calculate network, broadcast, and host ranges.
Percent Error Calculator
Calculate percentage error.
Percentage Change
Calculate increase/decrease.