Esta p谩gina tamb茅m existe em portugu锚s: Portugu锚s (Brasil) 路 Espa帽ol
HELLO, WORLD_
Calculators and data that answer instantly.
Finance
- Compound interest calculatorCalculate compound interest growth with monthly deposits. Formula, worked example and growth table by time horizon.
- Loan payment calculatorCalculate your monthly loan or mortgage payment with a full amortization schedule, total interest and payoff insights.
Dates
- Age calculatorCalculate exact age in years, months and days from a date of birth, including total months and days lived.
- Days between datesCount calendar days, weekdays and weeks between two dates. Instant tool with a table of common spans.
Everyday Math
- Percentage calculatorCalculate X% of a value, what percentage one number is of another, and the percent change between two values.
- Rule of threeSolve simple proportions: if A is to B, then C is to D. With practical examples and the difference between direct and inverse proportion.
- Discount calculatorCalculate the final discounted price and how much you save. Table by discount tier and the traps of stacked discounts.
- Tip calculatorCalculate the tip, the total bill and each person's share. With tipping conventions for the US and abroad.
Business
- Margin and markupCalculate profit, margin and markup from cost and selling price, and understand the difference that trips up even experienced sellers.
- Dimensional weight calculatorCalculate volume, dimensional weight (167 kg/m鲁 air standard) and the chargeable weight of your freight, and see why light cargo pays as heavy.
World
- Korean age calculatorCalculate your Korean age in all 3 systems (international, traditional and year age) and understand the 2023 law that unified legal age in Korea.
- Japanese era converterConvert western years to Japanese eras (Reiwa, Heisei, Showa, Taisho, Meiji), with a landmark year table and the mental math shortcut.
- Tipping around the worldTable of tipping customs in 40 countries: where it is required, where it offends and where it is already on the bill.
- Calendars of the worldThe 12 calendars in use around the world today, with type, where they apply and what year 2026 is in each. In Ethiopia, it is still 2018.
- US ZIP codes by stateEvery US state ranked by number of ZIP codes, with ranges and links to full state profiles. 40,977 codes mapped from open data.
- Alaska ZIP codesAlaska has 273 ZIP codes, from 99501 to 99950. See the cities with the most codes and how the numbering works.
- Alabama ZIP codesAlabama has 811 ZIP codes, from 35004 to 36925. See the cities with the most codes and how the numbering works.
- Arkansas ZIP codesArkansas has 706 ZIP codes, from 71601 to 72959. See the cities with the most codes and how the numbering works.
- Arizona ZIP codesArizona has 530 ZIP codes, from 85001 to 86556. See the cities with the most codes and how the numbering works.
- California ZIP codesCalifornia has 2,593 ZIP codes, from 90001 to 96162. See the cities with the most codes and how the numbering works.
- Colorado ZIP codesColorado has 645 ZIP codes, from 80001 to 81658. See the cities with the most codes and how the numbering works.
- Connecticut ZIP codesConnecticut has 429 ZIP codes, from 06001 to 06927. See the cities with the most codes and how the numbering works.
- District of Columbia ZIP codesDistrict of Columbia has 277 ZIP codes, from 20001 to 56972. See the cities with the most codes and how the numbering works.
- Delaware ZIP codesDelaware has 96 ZIP codes, from 19701 to 19980. See the cities with the most codes and how the numbering works.
- Florida ZIP codesFlorida has 1,473 ZIP codes, from 32003 to 34997. See the cities with the most codes and how the numbering works.
- Georgia ZIP codesGeorgia has 952 ZIP codes, from 30002 to 39901. See the cities with the most codes and how the numbering works.
- Hawaii ZIP codesHawaii has 137 ZIP codes, from 96701 to 96898. See the cities with the most codes and how the numbering works.
- Iowa ZIP codesIowa has 1,055 ZIP codes, from 50001 to 52809. See the cities with the most codes and how the numbering works.
- Idaho ZIP codesIdaho has 320 ZIP codes, from 83201 to 83877. See the cities with the most codes and how the numbering works.
- Illinois ZIP codesIllinois has 1,575 ZIP codes, from 60001 to 62999. See the cities with the most codes and how the numbering works.
- Indiana ZIP codesIndiana has 968 ZIP codes, from 46001 to 47997. See the cities with the most codes and how the numbering works.
- Kansas ZIP codesKansas has 748 ZIP codes, from 66002 to 67954. See the cities with the most codes and how the numbering works.
- Kentucky ZIP codesKentucky has 946 ZIP codes, from 40003 to 42788. See the cities with the most codes and how the numbering works.
- Louisiana ZIP codesLouisiana has 719 ZIP codes, from 70001 to 71497. See the cities with the most codes and how the numbering works.
Codes & Ciphers
- Roman numerals converterConvert numbers to Roman numerals and back, with the full reference table and the subtraction rules explained.
- Number base converterConvert between binary, decimal, hexadecimal and octal in any direction, with a reference table and why each base exists.
- Morse code translatorTranslate text to Morse code and back, with the full alphabet and the story of the code that refuses to die.
- Chess opening statisticsWhite wins, draws and Black wins for the 27 main chess openings, measured across 2,658,585 real games on Lichess.
- Sicilian Defense (1.e4 c5)The Sicilian Defense in real numbers: 45.9% White wins across 388,917 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- French Defense (1.e4 e6)The French Defense in real numbers: 47.8% White wins across 202,192 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Caro-Kann Defense (1.e4 c6)The Caro-Kann Defense in real numbers: 45.4% White wins across 93,081 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Italian Game (1.e4 e5 2.Nf3 Nc6 3.Bc4)The Italian Game in real numbers: 50.6% White wins across 88,443 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Ruy Lopez (1.e4 e5 2.Nf3 Nc6 3.Bb5)The Ruy Lopez in real numbers: 52.1% White wins across 73,519 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Scandinavian Defense (1.e4 d5)The Scandinavian Defense in real numbers: 49.7% White wins across 111,932 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Pirc Defense (1.e4 d6)The Pirc Defense in real numbers: 47.8% White wins across 58,616 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Alekhine's Defense (1.e4 Nf6)The Alekhine's Defense in real numbers: 44.6% White wins across 30,110 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Scotch Game (1.e4 e5 2.Nf3 Nc6 3.d4)The Scotch Game in real numbers: 52.7% White wins across 40,877 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- King's Gambit (1.e4 e5 2.f4)The King's Gambit in real numbers: 55.0% White wins across 68,798 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Vienna Game (1.e4 e5 2.Nc3)The Vienna Game in real numbers: 54.1% White wins across 20,015 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Queen's Gambit (1.d4 d5 2.c4)The Queen's Gambit in real numbers: 54.6% White wins across 154,562 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Slav Defense (1.d4 d5 2.c4 c6)The Slav Defense in real numbers: 51.3% White wins across 41,842 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Queen's Gambit Declined (1.d4 d5 2.c4 e6)The Queen's Gambit Declined in real numbers: 52.1% White wins across 45,803 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- King's Indian Defense (1.d4 Nf6 2.c4 g6 3.Nc3 Bg7)The King's Indian Defense in real numbers: 47.5% White wins across 16,082 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Nimzo-Indian Defense (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4)The Nimzo-Indian Defense in real numbers: 46.0% White wins across 13,554 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- Gr眉nfeld Defense (1.d4 Nf6 2.c4 g6 3.Nc3 d5)The Gr眉nfeld Defense in real numbers: 44.6% White wins across 6,847 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- London System (1.d4 d5 2.Bf4)The London System in real numbers: 51.3% White wins across 18,987 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- English Opening (1.c4)The English Opening in real numbers: 51.2% White wins across 97,752 Lichess games, the 5 most common replies, the rating effect and the opening's history.
- R茅ti Opening (1.Nf3 d5 2.c4)The R茅ti Opening in real numbers: 56.5% White wins across 6,918 Lichess games, the 5 most common replies, the rating effect and the opening's history.
Health
- BMI calculatorCalculate your BMI (weight 梅 height虏) with the official WHO classification and the limitations everyone should know.
- Daily calorie calculatorCalculate your BMR and daily calories to maintain, lose or gain weight, using the Mifflin-St Jeor equation.
- Healthcare providers in Alaska: counts by specialtyHow many healthcare providers does Alaska have? 35,499 active NPIs in NPPES/CMS, led by Mental Health Counselor. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Alabama: counts by specialtyHow many healthcare providers does Alabama have? 93,591 active NPIs in NPPES/CMS, led by Student in an Organized Health Care Education/Training Program. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Arkansas: counts by specialtyHow many healthcare providers does Arkansas have? 84,764 active NPIs in NPPES/CMS, led by Case Manager/Care Coordinator. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Arizona: counts by specialtyHow many healthcare providers does Arizona have? 173,450 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in California: counts by specialtyHow many healthcare providers does California have? 1,160,431 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Colorado: counts by specialtyHow many healthcare providers does Colorado have? 193,196 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Connecticut: counts by specialtyHow many healthcare providers does Connecticut have? 104,095 active NPIs in NPPES/CMS, led by Clinical Social Worker. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in District of Columbia: counts by specialtyHow many healthcare providers does District of Columbia have? 52,132 active NPIs in NPPES/CMS, led by Home Health Aide. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Delaware: counts by specialtyHow many healthcare providers does Delaware have? 27,521 active NPIs in NPPES/CMS, led by Physical Therapist. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Florida: counts by specialtyHow many healthcare providers does Florida have? 641,861 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Georgia: counts by specialtyHow many healthcare providers does Georgia have? 226,473 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Hawaii: counts by specialtyHow many healthcare providers does Hawaii have? 40,347 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Iowa: counts by specialtyHow many healthcare providers does Iowa have? 64,606 active NPIs in NPPES/CMS, led by Chiropractor. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Idaho: counts by specialtyHow many healthcare providers does Idaho have? 45,108 active NPIs in NPPES/CMS, led by Physical Therapist. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Illinois: counts by specialtyHow many healthcare providers does Illinois have? 313,799 active NPIs in NPPES/CMS, led by Clinical Social Worker. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Indiana: counts by specialtyHow many healthcare providers does Indiana have? 152,655 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Kansas: counts by specialtyHow many healthcare providers does Kansas have? 71,165 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Kentucky: counts by specialtyHow many healthcare providers does Kentucky have? 111,563 active NPIs in NPPES/CMS, led by Family Nurse Practitioner. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Louisiana: counts by specialtyHow many healthcare providers does Louisiana have? 124,137 active NPIs in NPPES/CMS, led by Case Manager/Care Coordinator. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Massachusetts: counts by specialtyHow many healthcare providers does Massachusetts have? 255,238 active NPIs in NPPES/CMS, led by Mental Health Counselor. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Maryland: counts by specialtyHow many healthcare providers does Maryland have? 211,064 active NPIs in NPPES/CMS, led by Behavior Technician. Table with the 30 largest specialties, each one's share and the cities with the most records.
- Healthcare providers in Maine: counts by specialtyHow many healthcare providers does Maine have? 42,710 active NPIs in NPPES/CMS, led by Clinical Social Worker. Table with the 30 largest specialties, each one's share and the cities with the most records.