🪧 About Calcopedia

The goal of the Calcopedia project is to create convenient and functional calculators and trainers.

My name is Evgeny Buyanov, and I am the founder of the project. In addition to that, I am also:

• A lecturer at the Department of Innovation Economics at Lomonosov Moscow State University.
• CEO and co-founder of 4brain.ru (one of the top 100 edTech projects in the CIS since 2020 according to HolonIQ).
• A nominee for the Google Award for the Best Educational Project at GoTech 2017.
• Received investments from FRIV (one of the leading venture investors in Europe in terms of the number of deals) and underwent acceleration with the 4brain project in 2016.
• Author of video blogs on YouTube and TikTok focusing on the development of soft skills.

📰 News

📅 September 18, 2026. Three new calculators tackle the point where a number needs to become a decision. The break-even calculator turns price and costs into a sales target; loan comparison checks two offers by payment and total cost; credit card payoff shows what a steady extra payment does to time and interest. They are planning models, so real fees and new card purchases still count.

📅 September 15, 2026. Estimate what an appliance costs to run before the bill arrives. The new electricity cost calculator works from power and operating time or measured kWh, with one, two or three tariff zones. Rates stay yours, so the result uses the same currency and does not pretend to reproduce every fee on a bill.

📅 August 25, 2026. Four new bidirectional time converters now connect milliseconds, seconds, minutes and hours. Start with milliseconds and seconds, or turn seconds into decimal hours; every pair accepts input on either side and keeps the calculation in its URL. Handy when 1:30 and 1.5 hours are not the same notation.

📅 August 23, 2026. Eleven new tools cover time, number theory, statistics and unit conversion. The online timer keeps its chosen duration in a shareable link; the maths shelf now includes digital root, GCD, LCM, next prime and Z-score calculators. Five bidirectional converters handle oil barrels and litres, joules and kilowatt-hours, kilojoules and kilocalories, microfarads and nanofarads, plus mph and km/h.

📅 August 22, 2026. Food labels use a neat 100 g or 100 mL basis; plates rarely do. The new calories per serving calculator scales the label value to what you actually measured, or works backwards from target calories to grams or millilitres. That reverse result is a proportion, not a recommended serving.

📅 August 21, 2026. Two familiar problems now have their own tools. The loan calculator compares fixed and declining repayments, interest and the total paid, while the combinations calculator counts unordered selections exactly. One plans a repayment schedule; the other confirms that choosing 3 people from 8 gives 56 groups.

📅 August 19, 2026. Planning wall, floor or ceiling insulation now starts with the insulation calculator. Enter the area, chosen thickness and package volume to see whole packs, purchase volume and the estimated remainder. Metric and imperial units are supported; thermal thickness still belongs to the building design.

📅 August 17, 2026. Calcopedia can make some noise now. The new online drums puts nine sounds under your fingers or the QWE, ASD and ZXC keys, with both a drum-kit view and a tidy pad grid. Set the tempo, hold a key for repeated hits, and let your speakers decide how quiet the practice really is.

📅 August 16, 2026. Eight new bidirectional converters cover area, mass, length, speed, pressure and angles. Compare land or room sizes with the area converter, turn ounces into grams, or switch from degrees to radians. Feet, yards, knots and psi are ready in the same two-field format too.

📅 August 16, 2026. Two new date tools are live. Use the day-of-week calculator to check a birthday, deadline or historical date. The week-number calculator turns the same date into its ISO 8601 week, useful when a schedule simply says “week 34”.

📅 August 13, 2026. The home-page search box now keeps count: Calcopedia has 180 calculators, and the number updates with the catalogue. The new miles to kilometres converter helps with routes, while pounds to kilograms covers parcels and scales. Both work in either direction and include related units.

📅 August 12, 2026. I added temperature converters for Celsius, Fahrenheit and kelvin. Use the Celsius to Fahrenheit converter for weather or ovens, or turn kelvin into Celsius; either field can drive the calculation. Réaumur is in the scale menu too, in case three thermometers arguing was not enough.

📅 August 11, 2026. I added a Poker Odds Calculator for Texas Hold’em. Pick your two hole cards, the board so far and 2 to 10 players; it estimates your share of the pot from 2,000 simulated deals against random hands. Useful before blaming the river, although the calculator still refuses to fold for you.

📅 December 20, 2023. Exciting News! Soon, our website will feature over 50 different converters, allowing you to convert various units of length, weight, volume, area, and more!

📅 December 15, 2023. Website now available in 16 languages: diversity for all users!

📅 October 5, 2023. Fractions got you fractured? 🥴 Bring harmony back with our Fraction Calculator. Peace out, math struggles! ✌️🔢 #FractionAction

📅 October 4, 2023. Tired of playing the 'guess that root' game? 🌱 Our Roots Calculator is your magic wand!✨ Now, you can square and cube like a pro. #RootForTheWin

📅 October 3, 2023. Distracted? Goldfish memory? 🐟 Dive into our Schulte Tables Calculator and train your brain to be sharper than a tack! 🧠⚡ #BrainGains

📅 October 2, 2023. Ever tried on the wrong size and done the dance of discomfort? 😂 Our NEW Clothing Size Calculator is here to rescue your groove! 🕺💃 #PerfectFit

📅 October 1, 2023. Decision paralysis? 🪙 Let fate decide! Try our Toss a Coin feature. Heads or tails, you can't lose! #FlipForFate

📅 September 30, 2023. Tired of simple math? 🧠 Dive deep with our Scientific Calculator! Einstein would've been proud. #BrainyTools

📅 September 29, 2023. Dreaming of the beach? 🌞 Our Countdown to Summer will have you in flip-flops before you know it! #SummerVibesSoon

📅 September 28, 2023. Too eager for 2024? 🎉 Our New Year's Timer is counting down with you! Watch those seconds tick away! #WaitingForJan1st

📅 September 27, 2023. Trying to decode your grades? 🧮 Our new GPA Calculator is here to give 'A+' clarity! No more guesswork! #GradeMysteries

📅 September 3, 2023. Calcopedia now boasts 89 calculators available in 6 languages. We'll soon hit over 100, and by year's end, we're aiming for more than 300 in 12 languages.

📅 August 21, 2023. Today we launched language versions of our calculators. A total of 6 languages - English, German, Russian, French, Spanish, Portuguese. 🇺🇸🇩🇪🇷🇺🇫🇷🇪🇸🇵🇹

📅 June 14, 2023. In a roundabout way, the new Circumference Calculator is taking math full circle! Say goodbye to π-ful calculations based on diameter, radius, or area! 🧮🔄🎉

📅 June 13, 2023. Babies, get ready! The Ovulation Calculator is here, optimizing conception dates & revealing fertile days! Fertility has never been this calculable! 👶📅💕

📅 June 12, 2023. Meat lovers, rejoice! No more guessing with the Barbecue Calculator! It calculates the amount of meat per person. A well-fed BBQ is now just a click away! 🥩🔥🎊

📅 June 4, 2023. Calories Burned Cycling is here: Want to know how many ice cream cones you've earned on that cycling adventure? This calculator has got your back! Just pedal your way through the numbers, and you'll discover the secret to guilt-free indulgence.

📅 June 3, 2023. Say hello to BMR Calculator: The ultimate tool to calculate your Basal Metabolic Rate (BMR). Find out how many calories you burn while sleeping, daydreaming, or plotting world domination. Get ready to redefine your relationship with pizza!

📅 June 2, 2023. Introducing Circle Diameter: Now you can finally put an end to circular mysteries! Just enter the circumference, and this calculator will reveal the diameter.

📅 June 1, 2023. Estimated Due Date: Exciting news for parents-to-be! Our calculator predicts the magical moment of childbirth. Count down the days until you meet your bundle of joy!

📅 May 31, 2023. Circle Area Calculator: Leave no circle uncalculated! With this nifty tool, you can effortlessly find the area, whether you know the diameter, radius, or circumference.

📅 May 30, 2023. BMI Calculator: Wondering if those extra fries are worth it? Find out with our BMI Calculator! Get quick insights into your weight status and conquer those pesky weight problems.

📅 May 29, 2023. HTML Editor: The ultimate tool for aspiring web designers! Edit code visually, so you can create stunning websites without getting tangled up in complicated syntax.

📅 May 28, 2023. VAT Calculator is here: No more headaches when it comes to calculating taxes! Easily determine the VAT amount and impress your accountant with your newfound precision.

📅 May 27, 2023. Introducing Simple Calculator: Say goodbye to mental math! Now you can calculate equations effortlessly, ensuring you never strain your brain cells again.

📅 May 26, 2023. 📢 Exciting News! Introducing Calcopedia.com, a new website revolutionizing calculators! We've launched with six sleek, user-friendly, and minimalist calculators. We value your feedback!

📅 May 25, 2023. The Calcopedia has launched with new calculators for calculating the area of a circle, body mass index, and VAT.