Free calculators for US taxes, finance, health, and more — all in one place.
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Calculate federal tax, FICA, state tax and take-home pay. Supports all 50 states and multiple pay frequencies.
Calculate monthly payments, total interest and PITI. Includes property tax and insurance estimates.
Calculate Body Mass Index in metric or imperial. Includes ideal weight range and BMI category.
Monthly payments and total interest for personal loans, auto loans, and student loans.
See how your savings and investments grow over time with regular contributions and compound returns.
Calculate weighted GPA using course names, credit hours, and letter grades on the 4.0 scale.
Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure to reach your health goals.
Calculate exact age in years, months and days. Find your next birthday and total days lived.
Estimate your 401(k) and savings balance at retirement age using compound growth and monthly contributions.
Add or remove state/local sales tax from any amount. Works with any custom tax rate.
Find out how many months to pay off your debt and how much interest you will save with extra payments.
Estimate API costs for GPT-4o, Claude, Gemini and other AI models based on input and output token counts.