Free Online Calculators
Fast, accurate, and ad-free calculators for math, finance, health, and everyday life. Real-time results, shareable URLs, and dark mode built in.
Math Calculators
View all →Finance Calculators
View all →Compound Interest Calculator
Calculate compound interest on savings and investments. See how your money grows over time with monthly or annual compounding.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and view amortization schedules for home loans.
Salary Calculator
Convert between annual salary, monthly pay, and hourly wage. Compare pay across different periods.
Debt Payoff Calculator
Compare avalanche vs snowball debt payoff strategies. Calculate time and interest to become debt-free.
Loan Calculator
Calculate monthly loan payments, total interest, and view payment schedules for any loan type.
Tax Bracket Calculator
Calculate federal income tax, marginal rate, and effective tax rate for 2024 tax brackets.
Sales Tax Calculator
Calculate sales tax for any purchase. Includes US state tax rates or enter custom rate.
Credit Card Payoff Calculator
See how long to pay off credit card debt. Compare minimum payments vs fixed payments.
Rent vs Buy Calculator
Compare the true cost of renting vs buying a home. See break-even analysis and yearly comparison.
Health Calculators
View all →BMI Calculator
Calculate your Body Mass Index (BMI) to check if your weight is healthy. Supports both metric and imperial units.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Enter your measurements for an accurate assessment.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) based on your BMR and activity level. Plan your calorie intake for weight goals.
Calorie Calculator
Calculate daily calorie needs using the Mifflin-St Jeor equation. Find calories for weight loss, maintenance, and gain.
Sleep Calculator
Calculate optimal bedtimes and wake times based on 90-minute sleep cycles. Wake up feeling refreshed.
Running Pace Calculator
Calculate running pace per km or mile. Get splits for 5K, 10K, half marathon, and marathon.
Macro Calculator
Calculate daily macros for protein, carbs, and fat based on calories and fitness goals.
BAC Calculator
Estimate blood alcohol content based on drinks, weight, gender, and time elapsed.
Period Calculator
Track menstrual cycle and predict next period. Calculate fertile window and ovulation dates.
Pregnancy Calculator
Calculate pregnancy due date from LMP or conception. Track gestational age and milestones.
1RM Calculator
Calculate one rep max from weight and reps. Get percentage-based training recommendations.
Everyday Calculators
View all →Age Calculator
Calculate your exact age in years, months, and days. Find the time between any two dates.
Tip Calculator
Calculate the right tip amount and split the bill between friends. Supports custom tip percentages.
GPA Calculator
Calculate your GPA on a 4.0 scale. Add courses with grades and credit hours for an accurate cumulative GPA.
Date Calculator
Calculate the number of days between two dates or add/subtract days from a date. Includes business days option.
Discount Calculator
Calculate sale prices, percent off savings, and reverse-calculate original prices from discounted amounts.
Hours Calculator
Calculate work hours, overtime, and pay from your time card. Track regular and OT hours.
Cooking Calculators
View all →Home Calculators
View all →Education Calculators
View all →Business Calculators
View all →Profit Margin Calculator
Calculate profit margin, markup, and profit from revenue and cost. Compare margin vs markup.
Break-Even Calculator
Calculate break-even point in units and revenue. Understand contribution margin and fixed costs.
YouTube Revenue Calculator
Estimate YouTube AdSense earnings based on views and niche. Understand CPM and RPM.
Why Use Our Calculators?
Our calculators are built for speed, accuracy, and ease of use. Every tool calculates results in real time as you type — no submit buttons, no page reloads. Each calculator shows the formula and step-by-step breakdown so you understand the math behind the answer.
Unlike other calculator sites, we don't clutter the page with ads or require signups. Share any calculation via URL — the link pre-fills your inputs and shows the result instantly. Works on desktop, tablet, and mobile with full keyboard accessibility and dark mode support.
All calculators are free, open, and built with modern web standards for sub-second page loads. Whether you need a quick percentage calculation, want to check your BMI, or are planning compound interest on your savings, we have the right tool.