Calculator Tools

Free online calculators for health, finance, and everyday math.

51 tools available

BMI Calculator

Calculate Body Mass Index with metric or imperial units

Age Calculator

Calculate exact age in years, months, days, hours, and minutes

Percentage Calculator

Calculate percentages, percentage change, and more

Tip Calculator

Calculate tip amount and split the bill between people

Loan Calculator

Calculate monthly payments and view amortization schedule

Compound Interest

Calculate investment growth with compound interest

BMR Calculator

Calculate Basal Metabolic Rate using Mifflin-St Jeor equation

TDEE Calculator

Calculate Total Daily Energy Expenditure and calorie targets

Water Intake Calculator

Calculate daily water needs based on weight, activity, and climate

Heart Rate Zones

Calculate 5 heart rate training zones based on age or max HR

Due Date Calculator

Calculate pregnancy due date from last menstrual period

Sleep Calculator

Find optimal bedtime or wake-up time based on sleep cycles

GPA Calculator

Calculate Grade Point Average from course grades and credit hours

Body Fat Calculator

Estimate body fat percentage using the US Navy method

Ideal Weight Calculator

Find ideal body weight using 4 popular medical formulas

Macro Calculator

Calculate daily protein, carb, and fat targets for your fitness goal

Calories Burned Calculator

Calculate calories burned during exercise using MET values

Mortgage Calculator

Calculate monthly mortgage payment and amortization schedule

Savings Goal Calculator

Calculate how long to reach your savings goal with compound interest

Credit Card Payoff Calculator

Calculate credit card debt payoff timeline and total interest paid

Retirement Calculator

Estimate retirement savings with compound interest and inflation adjustment

Running Pace Calculator

Calculate running pace, finish time, or distance with race projections

Discount Calculator

Calculate sale price, discount percentage, or original price with savings

Grade Calculator

Calculate weighted average grade, letter grade, and GPA from assignments

Salary Calculator

Convert salary between annual, monthly, biweekly, weekly, and hourly pay

Date Difference Calculator

Calculate exact days, weeks, months, and years between two dates

Tax Calculator

Estimate U.S. federal income tax using 2024 brackets and deductions

ROI Calculator

Calculate return on investment, CAGR, and net profit for any investment

Break-Even Calculator

Find break-even units and revenue from fixed costs, variable cost, and price

Fuel Cost Calculator

Estimate trip fuel cost by distance, MPG or L/100km, and gas price

Flooring Calculator

Calculate flooring tiles, planks, or boxes needed with waste factor and cost

Statistics Calculator

Calculate mean, median, mode, standard deviation, variance, and quartiles

Scientific Calculator

Advanced calculator with trig, log, exponents, factorial, and constants π and e

Timezone Converter

Compare time across multiple timezones with live clock and custom date/time input

Speed Calculator

Calculate speed, distance, or time from any two known values across multiple units

Electrical Calculator

Solve Ohm's Law for voltage, current, resistance, and power. Enter any two values to calculate the rest

Paint Calculator

Calculate how much paint you need for any room. Enter wall dimensions, coats, and coverage rate

Aspect Ratio Calculator

Calculate aspect ratios and scale dimensions proportionally. Supports 16:9, 4:3, 1:1, 3:2, and more.

Amortization Calculator

Generate a full loan amortization schedule with monthly principal, interest, and balance breakdown.

VAT Calculator

Add or remove VAT, GST, or sales tax from any price. Supports UK, EU, AU, CA, IN, and US rates.

NPV Calculator

Calculate Net Present Value (NPV) and Internal Rate of Return (IRR) for investment cash flows.

Permutation & Combination

Calculate permutations P(n,r) and combinations C(n,r). Find ordered arrangements and unordered selections for any n and r.

Standard Deviation Calculator

Calculate mean, variance, and standard deviation for any dataset. Supports population (σ) and sample (s) statistics.

Inflation Calculator

Calculate how inflation affects purchasing power over time. See the real value of money across any time period.

Ohm's Law Calculator

Calculate voltage, current, resistance, and power. Enter any two known values to solve for the remaining two instantly.

Unit Price Calculator

Compare multiple products by price per unit. Find the best value when shopping by comparing cost per oz, kg, or item.

Time Zone Meeting Planner

Plan meetings across multiple time zones. Find the best overlap window for your global team with a 24-hour grid.

CAGR Calculator

Calculate Compound Annual Growth Rate or project future value. Year-by-year growth table included.

Debt-to-Income Calculator

Calculate your DTI ratio to see if you qualify for a mortgage or loan. Front-end and back-end DTI with lender thresholds.

Hours Calculator

Calculate total hours worked between start and end times. Supports breaks, overnight shifts, and multiple entries.

Tip & Bill Splitter

Split a restaurant bill with tip among any number of people. Even split or custom amounts per person.

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