Free Online Calculators & Converters — Fast, Accurate, Private
Free online calculators for finance, math, health, dates, and everyday needs. No sign-up, instant results, privacy-focused.
🔥 Popular Calculators
Browse all →Loan Calculator
See your monthly payment, total interest, and full cost of borrowing before you sign anyt…
Open calculator →Percentage Calculator
Three percentage jobs in one tool: find a percent of a number, find what percent one numb…
Open calculator →BMI Calculator
Check your Body Mass Index in metric or imperial units and see which weight category you …
Open calculator →Age Calculator
Find your exact age in years, months, and days — or calculate how old you'll be on any fu…
Open calculator →Unit Converter
Convert between units of length, weight, temperature, area, volume, speed, time, and data…
Open calculator →Permutation Calculator
Count the number of ways to arrange r items chosen from n items, where order matters.
Open calculator →Browse by Category
Finance Calculators
View all (10) →Loan Calculator
See your monthly payment, total interest, and full cost of borrowing before you sign anyt…
Open calculator →Mortgage Calculator
Estimate your full monthly housing cost — principal, interest, property tax, and insuranc…
Open calculator →VAT Calculator
Add VAT to a price, remove it from a gross total, or extract how much VAT you paid — thre…
Open calculator →Discount Calculator
Find the final price after one discount, or two stacked discounts — and see exactly how m…
Open calculator →Compound Interest Calculator
Watch your money grow with interest on interest. Include monthly contributions and choose…
Open calculator →Simple Interest Calculator
Calculate interest that grows in a straight line — principal × rate × time, nothing more.
Open calculator →Math Calculators
View all (39) →Percentage Calculator
Three percentage jobs in one tool: find a percent of a number, find what percent one numb…
Open calculator →Scientific Calculator
A full-featured scientific calculator with trig, logs, exponents, roots, constants, and p…
Open calculator →Fraction Calculator
Add, subtract, multiply, or divide two fractions and get the result simplified.
Open calculator →Ratio Calculator
Simplify a ratio A:B to its lowest terms and find equivalent ratios.
Open calculator →Proportion Calculator
Solve a:b = c:d — find the missing value when three of the four are known.
Open calculator →Average Calculator
Paste a list of numbers and get the mean (arithmetic average) instantly.
Open calculator →Health & Fitness Calculators
View all (8) →BMI Calculator
Check your Body Mass Index in metric or imperial units and see which weight category you …
Open calculator →Calorie Calculator
Estimate how many calories you burn each day, then adjust for weight loss, maintenance, o…
Open calculator →BMR Calculator
Find your basal metabolic rate — the calories your body burns at complete rest, before an…
Open calculator →Body Fat Calculator
Estimate your body fat percentage from a few simple tape measurements — no calipers or la…
Open calculator →Ideal Weight Calculator
Estimate a healthy weight range for your height and sex using the most common formulas.
Open calculator →Macro Calculator
Split your daily calorie target into protein, carbs, and fat grams based on your goal and…
Open calculator →Date & Time Calculators
View all (6) →Age Calculator
Find your exact age in years, months, and days — or calculate how old you'll be on any fu…
Open calculator →Date Difference Calculator
Count exactly how many days, weeks, months, or years lie between any two dates.
Open calculator →Date Add/Subtract Calculator
Add or subtract years, months, and days from any date to find the exact resulting date.
Open calculator →Time Duration Calculator
Find how many hours and minutes pass between two times of day.
Open calculator →Work Hours Calculator
Calculate hours worked between a start and end time, minus a break — ready for timesheets…
Open calculator →Business Days Calculator
Add working days to a date, skipping weekends, to find the exact business-day deadline.
Open calculator →Everyday Life Calculators
View all (7) →Unit Converter
Convert between units of length, weight, temperature, area, volume, speed, time, and data…
Open calculator →Tip Calculator
Work out the tip, the total bill, and the per-person share in seconds — no mental math at…
Open calculator →Split Bill Calculator
Divide a total bill evenly, with optional tip and tax, and see exactly what each person p…
Open calculator →Cooking Measurement Converter
Convert recipe measurements between cups, spoons, milliliters, grams, ounces, and more — …
Open calculator →Sleep Calculator
Find what time to go to bed or wake up to complete full 90-minute sleep cycles and wake r…
Open calculator →Countdown Calculator
Count down the days, hours, minutes, and seconds remaining until any target date.
Open calculator →Statistics Calculators
View all (7) →Permutation Calculator
Count the number of ways to arrange r items chosen from n items, where order matters.
Open calculator →Combination Calculator
Count the number of ways to choose r items from n items, where order does not matter.
Open calculator →Descriptive Statistics Calculator
Paste a list of numbers and get mean, median, mode, range, variance, standard deviation, …
Open calculator →Z-Score Calculator
Convert a raw value into a z-score — how many standard deviations it sits from the mean.
Open calculator →Probability Calculator
Find the probability of an event from favorable outcomes and total possible outcomes.
Open calculator →Confidence Interval Calculator
Compute the confidence interval for a mean from sample mean, standard deviation, sample s…
Open calculator →Student Calculators
View all (6) →GPA Calculator
Convert your letter grades (A, B+, C-) into a grade point average on the 4.0 scale.
Open calculator →Grade Calculator
Turn your earned points and total points into a percentage grade instantly.
Open calculator →Final Grade Calculator
Find out what score you need on the final exam to hit your target course grade.
Open calculator →Weighted Grade Calculator
Calculate your course grade when assignments, exams, and participation each count for dif…
Open calculator →Marks Percentage Calculator
Convert exam marks (obtained out of total) into a percentage, for one subject or all subj…
Open calculator →Test Score Calculator
Calculate your test grade percentage from correct, total, and wrong answers — with wrong-…
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