Calculators
Everyday math made simple — finance, health, school and more, with instant answers.
35 free toolsTip Calculator
Split bills and calculate tips the American way.
Bill Split Calculator
Split the check fairly with tax and tip
Thanksgiving Turkey Calculator
Turkey size, thaw time, and cook time in seconds
HDHP vs PPO Calculator
Compare health plans and find your break-even point
Cat Age Calculator
Your cat’s age in human years
Emergency Fund Calculator
Your 3, 6, and 12-month targets
Recipe Scaling Calculator
Double or halve any recipe exactly
FSA Contribution Calculator
Pick your open-enrollment FSA amount
Gift Wrap Calculator
How much wrapping paper to buy
Party Drink Calculator
Exactly how much to buy for your party
Christmas Light Calculator
Light counts for trees and rooflines
Halloween Candy Calculator
Never run out of candy on Halloween night
Salary to Hourly Calculator
Convert annual salary to an hourly wage.
Percentage Calculator
X% of Y, discounts, tips and percent change.
Compound Interest Calculator
Watch your savings grow over the years.
Age Calculator
Your exact age in years, months and days.
Mortgage Calculator
Estimate your monthly payment.
BMI Calculator
Calculate your BMI.
GPA Calculator
Semester & cumulative GPA, 4.0 scale.
Pregnancy Due Date Calculator
Estimate your baby’s due date.
Sales Tax Calculator
Calculate US sales tax by state — forward and reverse tax modes included.
Ovulation Calculator
Find your fertile window and ovulation day in seconds.
Time Card Calculator
Total your work hours, breaks, overtime and gross pay — free, no signup.
TDEE Calculator
Find your daily calorie needs for cutting, maintaining or bulking — free, no signup.
Sleep Cycle Calculator
Best bedtime or wake-up time based on 90-min sleep cycles.
Auto Loan Calculator
Monthly car payment, total interest & cost with term comparison.
401(k) Calculator
Project your 401(k) with employer match, year by year.
Online Stopwatch
Millisecond-precision stopwatch with unlimited lap times.
Debt Payoff Calculator
Debt-free date + interest for snowball vs avalanche strategies.
Dog Age Calculator
Dog years to human years with size-adjusted vet formulas.
Paycheck Calculator
Estimate your take-home pay after US taxes.
Final Grade Calculator
Find the final exam score you need.
Bra Size Calculator
Find your true US bra size in 2 steps
Christmas Budget Planner
Plan gifts & holiday spending in USD
Profit Margin Calculator
Margin, markup & profit in one place