Everyday Life calculators (20)

Dates, ages, countdowns, trip fuel cost, electricity cost, tips, unit prices, grades, reading time, sleep.

Markdown version: /everyday.md · JSON: /api/v1/calculators?category=everyday

• Age Calculator — Computes the exact age on a given date as years, months and days by Gregorian calendar arithmetic, plus total days and weeks, the weekday of birth, and the date of and days until the next birthday. (md · api)
• Date Difference Calculator — Counts the days between two ISO dates and expresses the gap as weeks and days, as a calendar breakdown in years, months and days, and as business days (Monday–Friday, public holidays not excluded). (md · api)
• Add or Subtract Days Calculator — Adds a signed number of days to an ISO date and returns the resulting date and its weekday, using Gregorian calendar arithmetic in UTC. (md · api)
• Days Until Calculator — Counts the days from a reference date (default today) to a target date and reports the countdown as weeks and days, approximate months, a calendar breakdown and the target's weekday. (md · api)
• Day of the Week Calculator — Returns the weekday of any Gregorian date together with its day-of-year number, the ISO 8601 week number and week-based year, and whether it falls on a weekend. (md · api)
• Time Duration Calculator — Computes the elapsed time between a start and an end clock time (24-hour HH:MM), optionally minus a break, handling intervals that cross midnight, and reports it as hours and minutes and as decimal hours. (md · api)
• Fuel Cost Calculator — Estimates the fuel needed for a trip and its cost from distance, fuel consumption in litres per 100 km and the price per litre, with the cost per person when it is shared. (md · api)
• Electricity Cost Calculator — Converts an appliance's power draw and daily usage into kilowatt-hours and the running cost per day, over a chosen number of days, per 30-day month and per 365-day year, using the US DOE energy-use formula. (md · api)
• Bill Split Calculator — Adds an optional tip percentage to a bill and divides the total equally among a number of people, reporting the tip, the total and each person's share. (md · api)
• Unit Price Comparison Calculator — Divides each price by its quantity to get the price per unit, tells which of two options is cheaper per unit and by what percentage. (md · api)
• Reading Time Calculator — Estimates how long a text takes to read silently from its word count and a reading speed, defaulting to 238 words per minute, the adult mean for non-fiction found in Brysbaert's 2019 meta-analysis; also gives the read-aloud time at 183 wpm. (md · api)
• Typing Speed Calculator — Computes gross words per minute from characters typed (one word = 5 characters) or from a word count, then net WPM after penalising uncorrected errors, plus accuracy and characters per minute. (md · api)
• GPA Calculator — Computes a grade point average as the credit-weighted mean of course grade points (quality points divided by total credits), with an unweighted average when credits are omitted, and the nearest US letter grade on the 4.0 scale. (md · api)
• Final Grade Calculator — Solves the weighted-average grade equation for the final exam score required to reach a desired overall grade, given the current grade and the final's weight, and reports whether that score is achievable. (md · api)
• Sleep Cycle Calculator — Suggests bedtimes for a given wake-up time, or wake-up times for a given bedtime, so that sleep ends at the boundary of a full sleep cycle (default 90 minutes) after a typical time to fall asleep (default 14 minutes). (md · api)
• Aspect Ratio Calculator — Reduces a width and height to their simplest ratio and decimal value, identifies the closest common ratio (16:9, 4:3, 3:2, 21:9 …) and scales the dimensions to a new width or height while keeping the ratio. (md · api)
• Download Time Calculator — Computes how long a file transfer takes from the file size (MB, GB, TB) and the connection speed (Mbit/s, MB/s or Gbit/s), converting bytes to bits at 8 bits per byte with decimal (SI) prefixes. (md · api)
• Leap Year Calculator — Applies the Gregorian leap-year rule (divisible by 4, except centuries not divisible by 400) to a year and reports the reason, the number of days in the year and in February, and the next and previous leap years. (md · api)
• Roman Numeral Converter — Converts an integer from 1 to 3999 into standard (subtractive-notation) Roman numerals, or parses a Roman numeral back into a number, and shows the value of each symbol group. (md · api)
• Work Hours Calculator — Derives paid hours per day from shift start and end times minus unpaid breaks, scales them to a week (working days), an average month (52/12 weeks) and a year (52 weeks), and multiplies by an optional hourly rate for pay. (md · api)