Calculators

Here you'll find calculators that calculate one thing and do it properly. Each one shows not only the result, but also the formula it uses and explains what that number actually means. Nothing to install, no account needed.

Number game calculators

Keno Odds Calculator

Probability of every number of matches in Keno (20 of 70) or any game drawn without replacement — a full table, no payouts.

Lottery Odds Calculator

Exact odds of matching any number of balls in Lotto, Eurojackpot, Keno or your own lottery — as 1 in X and as a percentage.

Lottery System Calculator

Lottery combinations calculator: how many bets a full system covers and what it costs — Polish games or any custom pool.

Multiple Tickets Lottery Odds

How your total chance of the top prize changes with more tickets or more draws — and why the odds of each ticket stay the same.

Other calculators — maths

Arithmetic Mean

Enter numbers separated by commas and calculate the arithmetic mean online. The calculator will give you the s

Combinations, variations and permutations

Calculate the number of combinations, variations and permutations of n elements taken k at a time. Combinatori

Geometric mean

Calculate the geometric mean of any number of values. The n-th root of the product. Useful for rates of return

Hypergeometric Distribution Calculator

Probability of k successes when drawing without replacement: P(X = k), P(X ≤ k), P(X ≥ k), the full table, mean and variance — with urn, card and lottery examples.

Nth Root Calculator

Compute the square root, cube root or a root of any degree. The calculator handles negative numbers for odd de

Percentage Calculator

Online percentage calculator: percentage of a number, share and percentage change, plus increasing or decreasi

Weighted Average

Calculate a weighted average: enter values and weights, one pair per line. The calculator will give the sum of

Other calculators — costs

Average Fuel Price Calculator

Calculate the average fuel price from three fill-ups. Enter your own price per litre and see the result and ca

Commute Costs to Work

Calculate how much your car commute to work costs. Enter the one-way distance, fuel consumption, fuel price an

Fuel Consumption Calculator

Calculate your car's average fuel consumption: enter the distance driven and litres filled. The calculator wil

Other calculators — health

BMI Calculator

Calculate your BMI based on body weight and height. See which range you fall into, learn the WHO scale, and fi

Broca Formula Ideal Weight Calculator

Calculate your ideal body weight using the Broca formula based on height and sex. Learn the history of this 18

Harris-Benedict BMR Calculator

Calculate your basal metabolic rate using the Harris-Benedict equation. Enter weight, height, age and gender t

Lorentz Ideal Body Weight Calculator

Calculate ideal body weight using the Lorentz formula based on height and sex. See how it differs from the Bro

Mifflin-St Jeor Calculator

Calculate your basal metabolic rate using the Mifflin-St Jeor formula. Enter your weight, height, age and sex

Potton Ideal Weight Calculator

Calculate ideal body weight with the Potton formula from height and sex. A historical formula with two version

WHR Calculator — waist to hip ratio

Calculate WHR, the ratio of waist circumference to hip circumference. Check whether your body shape is apple o

WHtR Calculator — waist to height

Calculate WHtR, the ratio of waist circumference to height. Learn the „waist below half your height” rule, che

Other calculators — time

Age calculator

Calculate your exact age from your date of birth: full years, months and days. Also check how many days have p

Date Calculator — add or subtract days, weeks, months and years

Add days, weeks, months and years to a date or subtract them. The calculator respects leap years and month len

Days Between Dates Calculator

Count the days, weeks, months and years between two dates. Exclusive and inclusive variants, correct leap-year

25 calculators in total.