All Calculators

Calculate instructional days, class meeting days, and contact hours for any academic semester.

Calculate a future or past date by adding or subtracting business days. Skips weekends and public holidays automatically.

Calculate your exact age in years, months, and days from your date of birth. Find your total days lived and days until your next birthday.

Count working days between dates or add business days to a start date with U.S. and German holiday calendar options.

Calculate the exact number of days between two dates with standard, inclusive, and business day modes.

Calculate how many days in a month. See the length of each month, the average days per month, and convert between days, months, and weeks.

Calculate total days, working days, and weekend days for any year. Includes leap year detection.

Calculate days remaining until a target date, with weeks, months, and hours breakdown.

Convert hours and minutes into decimal hours for timesheets and payroll, with the total minute count shown alongside.

Calculate your statutory teaching load, track actual hours, and instantly determine your weekly overtime or underload balance.

Work out your dog's due date and whelping window from the breeding date — canine gestation averages 63 days, with a normal range of 58 to 68 days.

Calculate the exact morning and evening golden hour start and end times for any location and date to perfectly plan your photography or outdoor event.

Convert weeks to hours or hours to weeks instantly.

Calculate exact grading time and visualize how weekend exam marking pushes your weekly teacher workload past the legal 41-hour limit.

Calculate your remaining weeks of life based on the 4,000 Weeks philosophy and actuarial data.

Convert months to minutes using the average month length.

Convert months into nanoseconds, seconds, minutes, days, weeks, and years using the mean Gregorian month.

Calculate exact legal maternity leave dates (Mutterschutz) in Germany, including post-birth extensions and school holiday overlaps for teachers.

Find which calendar quarter (Q1–Q4) a date falls in, how many days into the quarter you are, and how many days remain in the quarter.

Calculate exactly how long until you turn 18. Enter your birth date for a precise countdown in days, hours, and weeks.

Convert seconds, minutes, hours, days, weeks, months and years. Free and instant — and it tells you which year length the answer assumes.

Find the ISO 8601 week number (Kalenderwoche / KW) for any date, plus the day of the year and the days remaining.

Calculate weekend days, full weekends, and working days for any month and year.

Convert your cat's age in years to human years using the standard AAHA feline life-stage conversion, with a worked breakdown of how the figure is reached.

Calculate the probability of flipping the same result on a streak of fair-coin flips, P(n) = (1/2)ⁿ, shown as a probability and as 1-in-X odds.

Convert your dog's age into human years with a size-aware calculator based on the AKC method.

Calculate a pitcher's Earned Run Average (ERA = earned runs × 9 / innings pitched) — the earned runs allowed per nine innings.

Score a fantasy football stat line under standard, half-PPR, or full-PPR rules, with a breakdown of passing, rushing, and receiving points.

Calculate your overthinking level and second date probability based on post-date anxiety indicators

Work out how many pizzas to order for a group: pizzas = round-up of (people × slices per person) ÷ slices per pizza, so nobody at your party goes hungry.

Calculate baseball slugging percentage (SLG) from at-bats and each kind of hit, weighting singles, doubles, triples, and home runs — plus total bases and batting average.

See what smoking really costs per day, month, year, and decade from how many cigarettes you smoke a day, the pack size, and the price per pack.

Convert a step count into distance in kilometres and miles using your average stride length — see how far 10,000 steps really is.

Calculate your typing speed in words per minute (WPM) and words per hour from the words you typed and the time it took.

Calculate win percentage from a win-loss-tie record, with ties counted as half a win, ignored, or counted as games — plus total games and win-loss ratio.

Calculate the average damage per hit when critical hits are factored in, from your base damage, crit chance, and crit multiplier.

Convert sensitivity settings between Counter-Strike 2 and Valorant for perfect muscle memory transfer.

Calculate the point-buy cost of your six D&D 5e ability scores against the 27-point budget, with points spent and remaining and instant validity checking.

Calculate damage per second (DPS = damage per hit × attacks per second) for any game weapon, ability, or build from its damage per hit and attack speed.

Calculate effective health (EHP = health / (1 − reduction)) from a character's health pool and damage-reduction percentage to see how much armor really protects you.

Calculate trading fees based on your Broker Relations and Accounting skill levels.

Calculate the average number of attempts to get a drop from a per-attempt chance — expected attempts equal one divided by the drop rate.

Convert a horizontal field of view to the vertical FOV for any aspect ratio with Vfov = 2 × arctan(tan(Hfov/2) / aspect ratio).

Calculate the probability of pulling at least one rare item in N gacha pulls with P(at least one) = 1 − (1 − p)ⁿ from a per-pull drop rate.

Calculate your kill/death ratio (K/D = kills ÷ deaths) from your kills and deaths, with a worked example and how to read the result.

Calculate the minimum Strength stat required to wield any weapon effectively in Kenshi. Avoid the Combat Speed penalty by knowing exactly how much Strength you need.

Calculate precise portal coordinates between the Overworld and Nether dimensions. Link portals correctly for fast travel via Nether Highways.

Estimate the per-throw chance of catching a wild Pokémon from its catch rate, HP, Poké Ball, and status condition using the Gen III/IV capture formula.

Calculate your XP gain multiplier and estimate actions needed to level up in Project Zomboid. Optimize your skill training with Fast Learner and skill books.

Interactive Stardew Valley crop profit chart - find the best crops for maximum gold per day with fertilizer and processing options.