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
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