One Go Calc

Every calculator in this section

Everyday

Days Between Dates Calculator: Count Days, Weeks & Business Days

Count the number of days between two dates , with the result also shown in weeks and months and as business days (Monday to Friday). Option...

Everyday

Age Calculator: Exact Age in Years, Months & Days

Enter a date of birth to get your exact age in years, months and days , plus your age in total months, weeks and days, the weekday you were ...

Everyday

Percentage Calculator: Percent of, Percent Change & More

Three common percentage questions in one place: what is X% of Y , X is what percent of Y , and the percent change from one number to anothe...

Health

Due Date Calculator: Estimate Your Baby's Due Date & Week

Estimate your baby’s due date from the first day of your last period, the conception date or an IVF transfer date, and see how far along yo...

Health

Calorie Calculator (TDEE): How Many Calories You Need per Day

Estimate your daily calorie needs from age, sex, height, weight and activity level. You get your basal metabolic rate (BMR), maintenance ca...

Health

BMI Calculator for Adults: Pounds & Feet or Metric

Find your body mass index in US units (feet, inches, pounds) or metric, see which CDC category it falls in and the healthy weight range for...

Taxes

Tip Calculator: How Much to Tip and Split the Bill

Choose a tip percentage, enter the bill and how many people are paying, and get the tip, total and each person’s share — with an option to ...

Taxes

Sales Tax Calculator 2026: Add or Remove Sales Tax by State

Add sales tax to a price, or work backward from a total to the pre-tax price. Pick a state to load its 2026 base rate, then add your local ...

Taxes

Hourly to Salary Calculator: Convert Wage to Annual Pay

Convert an hourly wage to a yearly salary — or a salary back to an hourly rate — and see the pay for every interval: daily, weekly, biweekl...

Taxes

Paycheck Calculator 2026: Take-Home Pay After Federal Tax & FICA

Turn your salary or hourly wage into take-home pay per paycheck . The calculator uses the 2026 federal tax brackets and standard deduction, ...

Savings

401(k) Calculator 2026: Retirement Savings with Employer Match

Project your 401(k) balance at retirement from your salary, contribution rate and employer match. The calculator applies the 2026 IRS limit...

Savings

Compound Interest Calculator with Monthly Contributions

See how an initial deposit and regular monthly contributions grow over time with compound interest . Choose daily, monthly, quarterly or ann...

Loans

Loan Payment Calculator: Monthly Payment & Total Interest

For personal loans, student loans or any fixed-rate installment loan: enter the amount, APR and term to see the monthly payment, total inter...

Loans

Auto Loan Calculator: Car Payment with Sales Tax, Trade-in & Fees

Work out your monthly car payment before you visit the dealer. Add the price, down payment, trade-in, APR and term, and the calculator incl...

Loans

Mortgage Calculator 2026: Monthly Payment with Taxes, Insurance & PMI

Enter a home price, down payment and rate to see your full monthly mortgage payment — principal and interest plus property tax, homeowners ...