Free online calculators for health, finance, and everyday math.
51 tools available
Calculate Body Mass Index with metric or imperial units
Calculate exact age in years, months, days, hours, and minutes
Calculate percentages, percentage change, and more
Calculate tip amount and split the bill between people
Calculate monthly payments and view amortization schedule
Calculate investment growth with compound interest
Calculate Basal Metabolic Rate using Mifflin-St Jeor equation
Calculate Total Daily Energy Expenditure and calorie targets
Calculate daily water needs based on weight, activity, and climate
Calculate 5 heart rate training zones based on age or max HR
Calculate pregnancy due date from last menstrual period
Find optimal bedtime or wake-up time based on sleep cycles
Calculate Grade Point Average from course grades and credit hours
Estimate body fat percentage using the US Navy method
Find ideal body weight using 4 popular medical formulas
Calculate daily protein, carb, and fat targets for your fitness goal
Calculate calories burned during exercise using MET values
Calculate monthly mortgage payment and amortization schedule
Calculate how long to reach your savings goal with compound interest
Calculate credit card debt payoff timeline and total interest paid
Estimate retirement savings with compound interest and inflation adjustment
Calculate running pace, finish time, or distance with race projections
Calculate sale price, discount percentage, or original price with savings
Calculate weighted average grade, letter grade, and GPA from assignments
Convert salary between annual, monthly, biweekly, weekly, and hourly pay
Calculate exact days, weeks, months, and years between two dates
Estimate U.S. federal income tax using 2024 brackets and deductions
Calculate return on investment, CAGR, and net profit for any investment
Find break-even units and revenue from fixed costs, variable cost, and price
Estimate trip fuel cost by distance, MPG or L/100km, and gas price
Calculate flooring tiles, planks, or boxes needed with waste factor and cost
Calculate mean, median, mode, standard deviation, variance, and quartiles
Advanced calculator with trig, log, exponents, factorial, and constants π and e
Compare time across multiple timezones with live clock and custom date/time input
Calculate speed, distance, or time from any two known values across multiple units
Solve Ohm's Law for voltage, current, resistance, and power. Enter any two values to calculate the rest
Calculate how much paint you need for any room. Enter wall dimensions, coats, and coverage rate
Calculate aspect ratios and scale dimensions proportionally. Supports 16:9, 4:3, 1:1, 3:2, and more.
Generate a full loan amortization schedule with monthly principal, interest, and balance breakdown.
Add or remove VAT, GST, or sales tax from any price. Supports UK, EU, AU, CA, IN, and US rates.
Calculate Net Present Value (NPV) and Internal Rate of Return (IRR) for investment cash flows.
Calculate permutations P(n,r) and combinations C(n,r). Find ordered arrangements and unordered selections for any n and r.
Calculate mean, variance, and standard deviation for any dataset. Supports population (σ) and sample (s) statistics.
Calculate how inflation affects purchasing power over time. See the real value of money across any time period.
Calculate voltage, current, resistance, and power. Enter any two known values to solve for the remaining two instantly.
Compare multiple products by price per unit. Find the best value when shopping by comparing cost per oz, kg, or item.
Plan meetings across multiple time zones. Find the best overlap window for your global team with a 24-hour grid.
Calculate Compound Annual Growth Rate or project future value. Year-by-year growth table included.
Calculate your DTI ratio to see if you qualify for a mortgage or loan. Front-end and back-end DTI with lender thresholds.
Calculate total hours worked between start and end times. Supports breaks, overnight shifts, and multiple entries.
Split a restaurant bill with tip among any number of people. Even split or custom amounts per person.