Free online calculators — mortgage, BMI, GPA, retirement, scientific, and 70+ more calculators for finance, health, math, and everyday life. 100% browser-based.
Calculate A/B test significance between two variants. Compare conversion rates with visitor and conversion data for each variant.
Computes exact age in years, months, days, hours, minutes, and seconds from a given birth date relative to any target date.
Calculate Annual Recurring Revenue from subscription revenue, expansion revenue, and churn. Essential for SaaS businesses tracking growth.
Calculate the aspect ratio from width and height dimensions. Find the simplified W:H ratio for images, videos, and screens.
Calculate daily baby formula amount based on weight and age. Get recommended ounces and milliliters per feeding.
Estimate baby growth percentiles from weight, height, and age. Monitor your childs growth compared to population averages.
Get recommended sleep schedules for babies by age. Learn total sleep hours, nap count, and nighttime sleep duration.
Computes Body Mass Index from metric or imperial height and weight inputs, categorizing the result into underweight, normal, overweight.
Calculate BMI for children with age and gender considerations. Track childhood growth and weight status.
Calculates Basal Metabolic Rate using the Mifflin-St Jeor equation with age, sex, height, and weight. Nutritionists use it for diet planning.
Calculate body fat percentage using the US Navy circumference method. Enter waist, neck, height, and hip measurements.
Calculate Body Surface Area using the Mosteller formula. Enter height and weight for medical and fitness BSA measurements.
Determines the exact unit volume or revenue required to cover fixed and variable costs, with a built-in sensitivity slider for price changes. Essential for startup pricing strategy, product launch planning, and manufacturing cost analysis where knowing your break-even point is critical before committing to production.
Calculate calories burned through breastfeeding. Enter babys age and feedings per day to estimate daily energy expenditure.
Calculates gross burn, net burn, and runway (in months) from monthly revenue, operating expenses, and current cash balance.
Count the number of business days between two dates, excluding weekends. Plan projects and track working days accurately.
Divides total sales-and-marketing spend by the number of new customers acquired in the same period to produce a blended acquisition cost. Startups and growth teams use CAC to evaluate marketing channel efficiency, optimize ad spend, and benchmark against LTV.
Calculate BMR and TDEE using the Mifflin-St Jeor equation. Get daily calorie needs based on age, gender, weight, height, and activity level.
Calculate monthly lease payments using capitalized cost, residual value, term, and money factor. Compare lease vs buy for your next vehicle.
Calculate monthly car loan payments, total interest, and total cost. Enter loan amount, rate, and term for a complete auto financing picture.
Predict a childs adult height based on parents heights using the mid-parental method. Estimate future height for boys and girls.
Calculate customer churn rate by dividing customers lost by total customers. Monitor retention health for your subscription business.
Calculate circle area and circumference from radius. Quick geometry calculations for circles of any size.
Calculate semester and cumulative GPA. Enter current grades, credits, and previous GPA to track your academic performance.
Calculate compound interest with regular contributions. See how your money grows over time with different compounding frequencies.
Calculate CAC by dividing total sales and marketing spend by new customers acquired. Understand your cost to acquire each customer.
Calculate Customer Lifetime Value using ARPU and churn rate. Understand how much revenue each customer generates over their relationship.
Calculate calories burned during cycling based on weight, duration, and speed. Track your cycling workout calorie expenditure.
Find out what day of the week any date falls on. Look up birthdays, holidays, historical events, and future dates.
Calculate the day number of the year for any date. Find out which day of 365 (or 366) a specific date represents.
Calculate the exact number of days between any two dates. Simple and accurate date difference calculator.
Calculate how many days remain until a target date. Countdown to events, deadlines, holidays, and special occasions.
Calculate how long it will take to pay off debt with monthly payments. See total interest paid and create a payoff plan.
Calculate savings and final price after a percentage discount. Perfect for shopping, sales, and budget planning.
Calculate dots per inch from pixel dimensions and physical size. Determine display and print resolution quality.
Splits a loan principal into equal monthly installments using the standard reducing-balance formula with configurable annual interest and tenure.
Calculate employee turnover rate
Calculate base raised to an exponent power. Compute large exponential values quickly with this simple math tool.
Calculate your final grade using weighted assignment scores. Enter grades and their weights to compute your overall percentage.
Generate CSS clamp() values for fluid responsive typography. Calculate viewport-based font sizes that scale smoothly.
Add, subtract, multiply, and divide fractions. Get simplified results for all common fraction arithmetic operations.
Calculate fuel economy in MPG (miles per gallon) from distance driven and fuel consumed.
Calculate your Grade Point Average from letter grades and credit hours. Supports standard 4.0 grading scale.
Convert percentage scores to letter grades. Enter your percentage to see the corresponding letter grade on standard scale.
Computes GST-inclusive and GST-exclusive amounts for Indian tax slabs (5%, 12%, 18%, 28%) with automatic HSN/SAC code hints.
Calculate heart rate training zones by age. Find your target heart rate ranges for different exercise intensity levels.
Convert hourly wage to annual salary. Enter hourly rate and hours per week to see your projected yearly income.
Calculate your ideal weight range based on height and gender. Get a healthy weight target using the Devine formula.
Calculate the future value of money adjusted for inflation. See how purchasing power changes over time with different inflation rates.
Calculate keto diet macros including protein, fat, and carbs. Get your personalized macronutrient targets for the ketogenic diet.
Calculate lean body mass from total weight and body fat percentage. Understand your muscle mass versus fat mass.
Check if any year is a leap year. Enter a year to find out if it has 366 days with February 29.
Projects customer lifetime value using average order value, purchase frequency, gross margin, and estimated customer lifespan in months. SaaS founders and e-commerce operators use LTV to determine acquisition budgets, segment high-value customers, and forecast recurring revenue.
Calculate daily macronutrient targets based on your goals. Get personalized protein, fat, and carb recommendations for weight loss or muscle gain.
Calculates gross margin percentage, markup percentage, cost, and selling price from any two known variables — perfect for retail pricing, wholesale negotiations, and e-commerce product listing optimization where you need to work backwards from a target margin.
Calculate mean, median, and mode from a list of numbers. Statistical analysis for any dataset with instant results.
Calculate monthly mortgage payments with amortization schedule. Enter loan amount, interest rate, and term to see total interest paid.
Calculate Monthly Recurring Revenue by multiplying customers by average revenue per customer. Track your SaaS revenue growth.
Calculate your net worth by subtracting total liabilities from total assets. Get a snapshot of your financial health.
Calculate Net Promoter Score from promoter, passive, and detractor responses. Measure customer loyalty and satisfaction.
Calculate your fertile window and ovulation date. Enter your last period date and cycle length for family planning.
Computes percentage values, percentage increases and decreases, and what-percent-of-what relationships with precise decimal arithmetic. Essential for everyday math — tips, discounts, tax rates, grade scores, and statistical comparisons where quick percentage answers are needed.
Calculate pixels per inch from diagonal resolution and screen size. Determine screen sharpness and pixel density.
Calculate your estimated due date from the first day of your last period. Get trimester dates and important pregnancy milestones.
Calculate probability of an event occurring. Enter favorable outcomes and total outcomes to get probability percentage and odds.
Computes gross profit, net profit, and margin percentages from revenue and cost inputs. Small-business owners use it to price products, evaluate supplier deals, and ensure healthy margins across their product lines.
Solve proportions with three known values. Find the missing value in a:b = c:d ratio equations.
Calculate daily protein requirements based on weight and activity level. Get tailored protein recommendations for your fitness goals.
Calculate the hypotenuse of a right triangle using the Pythagorean theorem. Enter sides a and b to find side c.
Solve quadratic equations of the form ax² + bx + c = 0. Get real and complex roots with step-by-step solutions.
Simplify ratios to their lowest terms. Enter two numbers to find the simplest whole-number ratio between them.
Calculate the area and perimeter of a rectangle from length and width. Simple geometry for construction, design, and planning.
Compare the total cost of renting versus buying a home over time. Factor in mortgage payments, rent, and equity growth.
Project your retirement savings based on current age, savings, monthly contributions, and expected returns. Plan for a comfortable retirement.
Calculate revenue growth rate by comparing current period revenue to previous period. Track your business growth over time.
Measures return on investment by comparing net gain or loss against the original cost, expressed as both a percentage and a dollar amount. Essential for marketing campaign evaluation, equipment purchase decisions, real estate investment analysis, and comparing investment opportunities.
Calculate running pace from distance and time. Enter your run details to find pace per kilometer and speed in km/h.
Calculate how many months your cash balance will last given your monthly burn rate. Essential for startup financial planning.
Models subscription revenue across tiers (free, monthly, annual) with inputs for conversion rate, churn, customer count, and average revenue.
Calculate net salary after taxes
Calculate the future value of monthly savings with compound interest. Plan your savings goals and see your money grow over time.
Evaluate mathematical expressions with sin, cos, tan, log, and sqrt functions. A versatile scientific calculator in your browser.
Calculate total cost of software licenses by seats, price per seat, and duration. Budget and plan your SaaS subscription costs.
Compare semantic version numbers. Check if one version is greater than, less than, or equal to another using semver rules.
Calculate simple interest using principal, rate, and time. Find total interest earned and final amount for basic interest calculations.
Projects the future value of recurring mutual-fund investments using compounded monthly returns based on historical or assumed growth rates.
Calculate optimal bedtime based on wake time and sleep cycles. Find the best time to go to bed for refreshed mornings.
Calculate the square root of any number. Get precise square root values for mathematical and scientific calculations.
Calculate standard deviation, variance, and mean from a list of numbers. Statistical analysis for data science and mathematics.
Convert steps to calories burned. Enter your step count and weight to estimate calories and distance walked.
Estimate your income tax with progressive tax brackets. Enter income and deductions to calculate estimated tax liability and effective rate.
Calculate TDS for Indian salaried employees under the new tax regime. Estimate monthly TDS deduction and net take-home salary.
Calculate trial-to-paid conversion rate. Enter total trials and paid conversions to understand your freemium or trial funnel performance.
Calculate the area of a triangle given base and height using the formula 0.5 × base × height.
Computes VAT-inclusive and VAT-exclusive amounts for EU member-state rates (standard and reduced) with country-specific rules for digital services.
Calculate daily water intake recommendations based on weight and exercise. Stay hydrated with personalized water goals.