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From mortgage payments to BMI, compound interest to unit conversions — beautifully simple tools that show their work.
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Financial
Mortgage, loans, investments, and compound interest
Financial
Mortgage, loans, investments, and compound interest
Mortgage
Calculate monthly mortgage payments, total interest, and see a full amortization schedule.
Loan
Find your monthly loan payment, total interest, and full repayment schedule for any loan.
Compound Interest
See how your savings grow with compound interest over time, including regular contributions.
Payment
Calculate fixed monthly payments for any loan amount, interest rate, and term.
Amortization
Generate a complete loan amortization schedule and see how extra payments save interest.
Finance
Solve for present value, future value, payment, or interest rate using time-value-of-money formulas.
Income Tax
Estimate your US federal income tax liability using 2024 tax brackets.
Auto Loan
Calculate monthly car payments including tax, down payment, and trade-in value.
Interest
Calculate simple or compound interest on any principal amount.
Retirement
See how much you will have saved by retirement with inflation adjustment.
Investment
Project investment growth with regular contributions and compound returns.
Inflation
See how inflation erodes purchasing power over time.
Salary
Convert your salary between hourly, daily, weekly, monthly, and annual rates.
Sales Tax
Quickly find the tax amount and final price for any purchase.
Health
BMI, calories, BMR, and body metrics
Health
BMI, calories, BMR, and body metrics
BMI
Calculate your Body Mass Index and see whether you are in a healthy weight range.
BMR
Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure.
Calories
Find your daily calorie and macro targets for weight loss, maintenance, or muscle gain.
Pace
Calculate running pace, speed, or total time for any distance.
Pregnancy
Find your due date, current pregnancy week, and trimester from your last menstrual period.
Conception
Work backwards from a desired due date to find your conception window and fertile period.
Body Fat
Estimate body fat percentage using the U.S. Navy tape-measure method.
Ideal Weight
Find your ideal weight range using multiple established formulas.
Due Date
Calculate your estimated due date and current week of pregnancy.
Math
Scientific, fractions, percentages, and more
Math
Scientific, fractions, percentages, and more
Scientific
A full-featured scientific calculator with trig, logarithms, powers, and more.
Percentage
Calculate percentages three ways: X% of Y, percentage change, or what percent X is of Y.
Fraction
Add, subtract, multiply, and divide fractions with automatic simplification.
Random Number
Generate random numbers within any range, with or without duplicates.
Triangle
Find all sides, angles, area, and perimeter of any triangle.
Std Deviation
Calculate mean, variance, and standard deviation for any data set.
TI-84
A faithful TI-84 Plus style calculator with trig, logarithms, inverses, and algebraic expressions.
Everyday
Age, tip, unit conversion, and daily tools
Everyday
Age, tip, unit conversion, and daily tools
Age
Calculate your exact age in years, months, and days, and find out when your next birthday is.
Tip
Calculate tip amount, total bill, and split evenly between any number of people.
Units
Convert between units of length, weight, temperature, volume, and speed instantly.
Time
Add or subtract time durations, or calculate elapsed time between two clock times.
Concrete
Estimate concrete volume in cubic yards and number of bags needed for slabs, footings, or columns.
Subnet
Calculate network address, broadcast address, usable hosts, and subnet mask from an IP and CIDR.
Date Diff
Find the exact difference between two dates in years, months, days, and business days.
Hours
Track work hours and calculate total time worked with optional earnings.
GPA
Calculate your weighted GPA from course grades and credit hours.
Grade
Calculate your weighted grade and letter grade across all assignments.
Password
Generate strong, random passwords with custom length and character sets.
All results update in real time
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