Free Online Calculators
Free online calculators for finance, health, education, and everyday math. No sign-up required, instant results in your browser.
16 tools available, all free, no sign-up required.
Calorie Calculator
Calculate your TDEE and daily calorie needs. Get personalized targets for weight loss, maintenance, or gain. Uses Mifflin-St Jeor and Harris-Benedict formulas.
Paycheck Calculator
Calculate take-home pay after federal and state taxes, Social Security, Medicare, and pre-tax deductions. Supports hourly and salary with 2026 tax brackets.
Compound Interest Calculator
Calculate compound interest growth with optional monthly contributions. Choose compounding frequency from daily to annually.
Pregnancy Calculator
Calculate due date from last period or conception date. Track fetal development week by week with milestones.
Macro Calculator
Calculate daily macros (protein, carbs, fat) based on TDEE and fitness goal. Supports cutting, bulking, maintenance with keto and low-carb presets.
BMI Calculator
Calculate BMI in metric or imperial units. Get ideal weight range and health risk assessment based on BMI categories.
Grade Calculator
Calculate weighted grade average from assignments. Find out what score you need on your final exam. Customizable grading scale.
GPA Calculator
Calculate GPA on 4.0, 5.0, or percentage scale. Add multiple courses with credit hours. Instant GPA calculation.
Dividend Calculator
Calculate dividend income, yield, and total return. Track quarterly and annual dividend payments.
Loan Calculator
Calculate monthly payments for personal, auto, and student loans. View amortization schedule and see how extra payments save interest.
Mortgage Calculator
Calculate monthly mortgage payment, total interest, and full amortization schedule. Enter loan amount, rate, and term.
Tip Calculator
Calculate tip amount, total bill, and per-person share. Tip presets (10–25%), custom percentage, split between any number of people, and round-up-to-dollar toggle.
Ovulation Calculator
Calculate ovulation date and fertile window from last period. Track best days to conceive for pregnancy.
Retirement Calculator
Plan your financial future. Calculate retirement savings growth and monthly withdrawal amounts using the 4% rule.
Percentage Calculator
Calculate percentages instantly, percent of a number, percentage change, discounts, and more.
Age Calculator
Calculate your exact age in years, months, and days, plus total days lived and next birthday countdown.