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Basic
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Percentage
% of, % change, difference
Fraction Calculator
Add, subtract, multiply fractions
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Tip Calculator
Split bills with tip
Discount Calculator
Sale price and savings
Tax Calculator
Pre/post tax amounts
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Average Calculator
Mean, median, mode
Square / Nth Root
Roots and radicals
Exponent Calculator
Base raised to a power
Modulo Calculator
Remainder after division
Ratio Simplifier
Simplify and compare ratios
Rounding Calculator
Round to any decimal place
Proportion Solver
Solve a/b = c/d
Long Division
Step-by-step division
Absolute Value
Distance from zero
Factor Calculator
All factor pairs of a number
LCM & GCD
Least common multiple & GCD
Scientific
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Trigonometry
sin, cos, tan + inverse
Logarithm
log₁₀, ln, log₂ of any number
Quadratic Solver
Roots via quadratic formula
Significant Figures
Round to sig figs
Probability
Permutations & combinations
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Statistics
Variance, std dev, Z-score
Complex Numbers
Operations in a+bi form
Scientific Notation
Convert to/from sci notation
Linear Equation
Solve ax + b = c
Hyperbolic Functions
sinh, cosh, tanh
Vector Calculator
Dot product, cross product, angle
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Matrix Determinant
2×2 and 3×3 determinant
Combinations nCr
Choose r items from n
Binomial Theorem
Expand (a+b)ⁿ
Newton's Method
Numerical root finding
Permutation nPr
Ordered arrangements
Financial
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Compound Interest
Future value with compounding
Simple Interest
Principal × rate × time
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Mortgage
Monthly payment + amortization
Loan Calculator
Any loan, any term
ROI Calculator
Return on investment %
Inflation
Purchasing power over time
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Salary Converter
Hourly ↔ annual conversion
Break-Even Point
Fixed vs variable costs
CAGR
Compound annual growth rate
Credit Card Payoff
Time to pay down balance
Savings Goal
How long to reach a target
NPV
Net present value
Bill Splitter
Split a bill among people
Currency Rates
Major exchange rate conversion
Stock Return
Total return incl. dividends
Payback Period
Investment recovery time
Debt-to-Income
DTI ratio for loans
Retirement Savings
Long-term savings projection
Health
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BMI Calculator
Body mass index
BMR Calculator
Basal metabolic rate
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TDEE Calculator
Total daily energy expenditure
Calorie Deficit
Weight loss target calories
Macro Calculator
Protein, carbs, fat split
Body Fat %
Navy method body fat estimate
Ideal Weight
Hamwi & Devine formulas
Water Intake
Daily hydration needs
Heart Rate Zones
Training zones by age
Running Pace
Pace, speed, finish time
One Rep Max
Epley & Brzycki formulas
Pregnancy Due Date
EDD from last period
Sleep Calculator
Optimal wake-up bedtimes
Steps to Calories
Daily steps energy burn
Protein Intake
Daily protein target
VO2 Max
Aerobic fitness estimate
Unit Converter
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Length
m, ft, in, miles, km…
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Weight / Mass
kg, lbs, oz, stones…
Temperature
°C, °F, Kelvin
Volume
L, gal, fl oz, cups…
Area
m², ft², acres, hectares
Speed
km/h, mph, knots, m/s
Pressure
Pa, bar, PSI, atm
Energy
J, cal, BTU, kWh
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Data Storage
bits, bytes, MB, GB, TB
Fuel Efficiency
MPG ↔ L/100km
Angle
Degrees, radians, gradians
Force
Newtons, lbf, kgf, dyne
Cooking
Cups, tbsp, tsp, ml
Time
sec, min, hr, days, years
Power
W, kW, horsepower, BTU/hr
Frequency
Hz, kHz, MHz, GHz
Date & Time
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Date Difference
Days between two dates
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Age Calculator
Exact age in years, months, days
Add / Subtract Days
Find a future or past date
Day of the Week
What day is any date?
Business Days
Working days between two dates
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Unix Timestamp
Epoch ↔ human date
Week Number
ISO week of the year
Countdown
Days until an event
Time Calculator
Add and subtract time values
Timezone Converter
Convert across UTC offsets
Leap Year Checker
Is a year a leap year?
Quarter of Year
What quarter is a date in?
Workday Estimator
Add N business days to a date
Duration Calculator
HH:MM:SS arithmetic
Math Tools
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Prime Checker
Is a number prime?
Prime Factorization
Factor tree decomposition
Fibonacci Sequence
Generate the Fibonacci sequence
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Base Converter
Binary, octal, decimal, hex
Modular Arithmetic
(a op b) mod m operations
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Truth Table
AND, OR, NOT, XOR logic
Pythagorean Theorem
Missing side of a right triangle
Triangle Solver
SSS — sides, angles, area
Circle Calculator
Area, circumference, diameter
Polygon
Regular polygon area and perimeter
3D Volume
Sphere, cube, cylinder, cone, box
Normal Distribution
PDF, CDF and Z-score
Pascal's Triangle
Generate rows of Pascal's triangle
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Set Operations
Union, intersection, difference
GCD / LCM
Greatest common divisor and LCM
Arithmetic Sequence
nth term and sum of sequence
Programming
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Color Converter
HEX, RGB, HSL, CMYK
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Base64
Encode & decode strings
URL Encoder
Percent-encode / decode URLs
Hash Generator
MD5, SHA-1, SHA-256, SHA-512
UUID Generator
Generate v4 UUIDs
Password Generator
Secure random passwords
Bitwise Calculator
AND, OR, XOR, NOT, shifts
px ↔ rem
CSS unit conversion
Lorem Ipsum
Generate placeholder text
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Regex Tester
Live regex match and highlight
ASCII / Unicode
Character ↔ code lookup
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IP Subnet
CIDR, mask, broadcast, hosts
JSON Formatter
Beautify and minify JSON
Binary ↔ Text
Convert text to binary and back
Character Counter
Word, char, line, sentence count
Timestamp Format
Format date/time strings