Financial
View all →Mortgage Calculator
Monthly payment with full amortization schedule
Loan Calculator
Personal, auto & student loan payments
Auto Loan Calculator
Car payment with trade-in & down payment
Compound Interest
Future value with regular contributions
Savings Calculator
Project savings growth or reach a goal
ROI Calculator
Return on investment & CAGR
Income Tax Calculator
2024 US federal & state tax estimate
Retirement Calculator
401(k) & retirement savings projection
Credit Card Payoff
Time & interest to pay off balance
Amortization Schedule
Full payment breakdown over loan life
Investment Calculator
Long-term portfolio growth projection
Inflation Calculator
Purchasing power & real value over time
Budget Calculator
50/30/20 rule budget planner
CD Calculator
Certificate of deposit earnings
Debt Payoff
Avalanche vs snowball strategy
Simple Interest
Basic interest calculation
Home Affordability
How much house can you really afford?
Net Worth Calculator
Total assets minus liabilities
Salary Calculator
Convert hourly, weekly & annual pay
Paycheck Calculator
Take-home pay after all taxes
Roth vs Traditional IRA
Which retirement account wins for you?
FIRE Calculator
Your financial independence number & date
Stock Profit & Loss
Returns, tax & annualized gain on trades
Rental Property ROI
Cash flow, cap rate & 10-year returns
Break-Even Calculator
Units & revenue needed to profit
Currency Converter
Convert between 30+ world currencies
Fitness & Health
View all →BMI Calculator
Body Mass Index from height & weight
Calorie Calculator
Daily calorie needs (TDEE)
Body Fat Calculator
Body fat % via US Navy method
Heart Rate Zones
Target training zones from max HR
Ideal Weight
Healthy weight using 5 medical formulas
Water Intake
Daily hydration recommendation
Macro Calculator
Protein, carbs & fat targets by goal
Protein Calculator
Daily protein target by goal & activity
Running Pace Calculator
Pace, speed, time & race predictor
One Rep Max (1RM)
Max lift estimate from sub-max effort
Calories Burned
Energy burned by 50+ activities
Steps to Miles
Convert steps to distance & calories
Sleep Calculator
Optimal bedtime for full sleep cycles
Body Surface Area
BSA for medical dosing calculations
Waist-to-Hip Ratio
Cardiovascular disease risk indicator
Pregnancy Due Date
EDD from LMP, conception, or ultrasound
Ovulation Calculator
Fertile window & ovulation date
Child Height Predictor
Predict adult height from parent heights
Math
View all →Percentage Calculator
4 modes: X% of Y, change, reverse %
Scientific Calculator
Full-featured with trig, log & memory
Fraction Calculator
Add, subtract, multiply, divide fractions
Statistics Calculator
Mean, median, mode, std deviation
Quadratic Equation
Solve ax²+bx+c=0, real & complex roots
Triangle Calculator
Sides, angles & area — all types
GCF & LCM Calculator
Greatest factor & least multiple
Prime Factorization
Factor any number & check if prime
Binary / Hex Converter
Convert between number bases
Ratio Calculator
Simplify ratios & find missing values
Circle Calculator
Area, circumference, arc & sector
Combinations & Permutations
C(n,r) and P(n,r) for probability
Matrix Calculator
Add, multiply, determinant & inverse
Exponent Calculator
Powers, roots & scientific notation
Logarithm Calculator
log₁₀, ln, log₂ & any custom base
Number Sequence
Arithmetic, geometric & Fibonacci
Others
View all →Age Calculator
Exact age with zodiac & day of week
Date Difference
Days between dates + date math
Time Calculator
Add & subtract time, convert units
Tip Calculator
Tip amount & bill splitting
Discount Calculator
Sale price, % off, stacked discounts
Fuel Cost Calculator
Trip cost & vehicle comparison
Electricity Cost
Appliance running cost estimator
Unit Converter
Length, weight, temp, volume & more
GPA Calculator
Semester & cumulative GPA on 4.0
Grade Calculator
Weighted grades & final score needed
Password Generator
Secure passwords with strength checker
Roman Numeral Converter
Convert Arabic ↔ Roman numerals
Concrete Calculator
Cubic yards for slabs, footings & columns
Paint Calculator
Gallons needed for any room or wall
Calories Burned
50+ activities with MET method
Child Height Predictor
Adult height from parent heights
Work Time
View all →Time Card Calculator
Weekly clock-in/out with overtime & pay
Work Hours Calculator
Start/end time to net hours worked
Lunch Break Calculator
Hours worked minus break deductions
Overtime Calculator
Regular vs OT hours & total pay
Biweekly Timesheet
14-day pay period hours tracker
Business Days Calculator
Weekdays between dates, US holidays
PTO Calculator
Accrual rate, balance & usage tracker
Holiday Pay Calculator
Pay at 1×, 1.5× or 2× holiday rates
Salary to Hourly
Annual salary → effective hourly rate
Hourly to Salary
Hourly wage → annual & monthly salary