Category · 71 tools
Other
calculators
Unit converters, date & time tools, everyday math, home improvement, and programmer utilities. All calculations run locally in your browser.
- 01
Tip
Calculate the exact tip and total for any bill. Choose 10%, 15%, 18%, 20%, or enter a custom percentage — instant results with no guessing.
Calculate → - 02
Split Bill
Split any restaurant bill evenly — with tip — and never be $0.01 short. Uses carry-remainder allocation so every cent is accounted for.
Calculate → - 03
Fuel Cost
Calculate trip fuel cost in seconds. Works in US units (miles/mpg/$/gal) and metric (km/L per 100km/$/L). See total cost, fuel used, and cost per mile or km.
Calculate →
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- 01 Angle Converter Convert between degrees, radians, gradians (gon), arcminutes, arcseconds, and turns using exact ISO 31-1 mathematical relationships. Other
- 02 Area Converter Convert between square millimetres, centimetres, metres, kilometres, inches, feet, yards, acres, hectares, and square miles. Exact NIST-derived factors. Other
- 03 Clothing Size Converter Convert clothing sizes between US, UK, EU, and International (XS/S/M/L/XL) for women's and men's tops and bottoms. Other
- 04 Cooking Unit Converter Convert between cups, tablespoons, teaspoons, fluid ounces, pints, quarts, gallons, and millilitres. Also converts grams, ounces, and pounds for baking. Other
- 05 Data Size Converter Convert between bytes, kilobytes, megabytes, gigabytes and more. Switch between SI (1000-based, kB/MB/GB) and IEC (1024-based, KiB/MiB/GiB) with explicit labeling. Other
- 06 Energy Converter Convert between joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, and foot-pounds using exact NIST-defined conversion factors. Other
- 07 Fuel Economy Converter Convert fuel economy between MPG (US), MPG (UK/Imperial), L/100km, and km/L. Handles the inverted L/100km relationship correctly using exact NIST factors. Other
- 08 Length Converter Convert between millimetres, centimetres, metres, kilometres, inches, feet, yards, miles, and nautical miles. Uses exact NIST-defined conversion factors. Other
- 09 Shoe Size Converter Convert shoe sizes between US, UK, EU, and Mondopoint (cm foot length) for women and men. Find your size in any system. Other
- 10 Speed Converter Convert between metres per second, kilometres per hour, miles per hour, feet per second, and knots. Uses exact NIST-defined conversion factors. Other
- 11 Temperature Converter Convert between Celsius, Fahrenheit, and Kelvin instantly. Enter one temperature and see all three scales simultaneously. Uses exact affine transforms — not ratios. Other
- 12 Time Duration Convert between HH:MM:SS and decimal hours for timesheets and payroll. Handles minute and second overflow automatically (75 minutes → 1h 15m). Other
- 13 Volume Converter Convert between US and imperial (UK) volume units. Includes gallons, pints, quarts, fluid ounces, cups, and litres. US and imperial units are clearly separated to prevent errors. Other
- 14 Weight Converter Convert between milligrams, grams, kilograms, metric tonnes, ounces, pounds, stone, and US/UK tons. Uses exact NIST-defined conversion factors. Other
- 01 Add/Subtract Days Add or subtract any number of days from a date. Enter a negative number of days to subtract. Handles month and year boundaries automatically. Other
- 02 Age Calculate your exact age in years, months, and days from your date of birth. Handles Feb-29 birthdays and shows your next birthday. Other
- 03 Age in Days Calculate your exact age in total days, weeks, months, and years from your date of birth. Enter a custom reference date to calculate between any two dates. Other
- 04 Business Days Count the working days between two dates, excluding weekends and US federal holidays. Uses the OPM 2026 federal holiday calendar with observed-weekday shifting. Other
- 05 Countdown Count down the days, hours, minutes, and seconds to any future date — or see how much time has passed since a past date. Updates live every second. Other
- 06 Date Difference Calculate the number of calendar days, months, and years between two dates. Uses UTC calendar arithmetic — accurate across daylight saving time transitions. Other
- 07 Day of the Week Find out what day of the week any date falls on — past, present, or future. Works correctly for leap years, century years, and dates as far back as the Gregorian calendar. Other
- 08 Retirement Age Calculate how many years, months, and days remain until your target retirement age or a specific retirement date. Includes your Social Security Full Retirement Age for reference. Other
- 09 Roman Numeral Date Convert any Gregorian date to Roman numerals (day · month · year) for wedding invitations, engravings, or monuments — or decode a Roman numeral date back to a calendar date. Other
- 10 Time Between Dates Calculate how much time is between two dates — in days, weeks, hours, and a years/months/days breakdown. Perfect for payroll, project timelines, and scheduling. Other
- 11 Time Card Enter clock-in and clock-out times to calculate total hours worked, with optional unpaid break deduction. Returns results in both decimal hours and HH:MM format. Other
- 12 Timezone Converter Convert times between timezones — Eastern, Pacific, GMT, Tokyo, Sydney, and 20+ more — with correct DST handling for any date. Other
- 13 Week Number Find the ISO 8601 week number for any date. Handles year-boundary traps where December dates fall in week 1 of the next year, or January dates belong to the previous year's week 53. Other
- 14 Work Hours Calculate total weekly hours worked from daily clock-in and clock-out times. Supports up to 7 days, overnight shifts, and a configurable overtime threshold. Other
- 01 Aspect Ratio Calculate the aspect ratio of any image, video, or screen, and scale dimensions proportionally. Simplifies ratios like 1920×1080 to 16:9 and computes missing width or height. Other
- 02 Carbon Footprint Calculator — Estimate Your Annual CO₂ Emissions Estimate your annual personal carbon footprint in metric tons CO₂e. Enter your driving, home energy use, diet, and flights to see your total and how it compares to the US average. Other
- 03 Currency Converter Convert any amount between two currencies using your own exchange rate. Enter today's rate from your bank — no live data, no fees, no surprises. Other
- 04 Discount Calculate the sale price after one or more stacked discounts. Works correctly for stacked percentage-off deals — avoiding the common 30%-vs-28% error. Other
- 05 Electricity Cost Calculate how much a device costs to run per day, month, and year. Enter wattage, daily hours, and your electricity rate — defaults to the US average of $0.16/kWh. Other
- 06 Fuel Cost Calculate trip fuel cost in seconds. Works in US units (miles/mpg/$/gal) and metric (km/L per 100km/$/L). See total cost, fuel used, and cost per mile or km. Other
- 07 GPA Calculate your GPA on a 4.0 unweighted, weighted 5.0 (AP/honors), or 100-point scale. Add any number of courses and credit hours for an accurate weighted average. Other
- 08 Grade Find out what score you need on your final exam to reach your target grade. Handles any exam weight percentage — instantly shows if your goal is achievable. Other
- 09 Grade Needed Calculator — What Grade Do I Need on My Final? Find out exactly what score you need on your final exam to achieve your target course grade. Enter your current grade, the weight of work done so far, and your desired overall grade. Other
- 10 Number Words Convert any integer to its written English form. Enter a number and instantly see it spelled out in words — useful for checks, legal documents, and programming. Other
- 11 Reading Time Calculator — How Long Will It Take to Read? Find out exactly how long it takes to read any piece of text. Enter the word count and your reading speed to get an estimated reading time in minutes and seconds. Other
- 12 Recipe Scaling Scale any recipe up or down instantly. Enter original and desired servings, then add ingredients with quantities to see original and scaled amounts side-by-side. Other
- 13 Ring Size Convert finger circumference or diameter to US, UK, EU, and Japan ring sizes. Or look up circumference and diameter from a US size. Other
- 14 Split Bill Split any restaurant bill evenly — with tip — and never be $0.01 short. Uses carry-remainder allocation so every cent is accounted for. Other
- 15 Tip by Item Calculator — Split the Bill Fairly by What You Ordered Split a restaurant bill fairly when everyone ordered different amounts. Assign each item to a diner and set the tip — each person pays for their items plus a proportional share of the tip. Other
- 16 Tip Calculate the exact tip and total for any bill. Choose 10%, 15%, 18%, 20%, or enter a custom percentage — instant results with no guessing. Other
- 17 Unit Price Compare the true cost per unit of two products — even in different package sizes or units. Instantly see which size or brand is the better value. Other
- 18 Words to Pages Calculator — How Many Pages Is My Word Count? Convert word count to an approximate page count for academic and professional documents. Choose font size (10/11/12pt) and line spacing (single/double) to match your format. Other
- 01 BTU Estimate the air conditioner or heater size needed for any room. Based on ACCA rule-of-thumb sizing — adjust for sunlight and occupancy. Results are ballpark estimates only. Other
- 02 Concrete Calculate cubic yards and how many bags of concrete to buy for any slab or footing. Bags are always rounded up; bag yield is flagged as manufacturer-specific. Other
- 03 Concrete Steps Calculate concrete volume and bags needed for steps from riser height, tread depth, step count, and width. Includes IRC 2021 riser and tread code compliance check. Other
- 04 Deck Calculate lumber board count, joist and beam estimates, and material cost for your deck project. Enter your deck dimensions and get an instant material estimate. Other
- 05 Drywall Calculate sheets of drywall needed from room dimensions and door/window cutouts. Choose 4×8 or 4×12 sheet size. Includes joint compound estimate. Other
- 06 Fence Post Calculate how many fence posts, rails, and panels you need for a single run or enclosed yard. Includes post hole depth, concrete bags to buy, and optional cost estimate. Other
- 07 Fencing Calculate linear feet of fencing, post count, and panel count for any yard. Supports rectangle mode and custom side lengths. Add cost per linear foot for a total estimate. Other
- 08 Flooring Calculate square footage of flooring needed with waste factor, number of boxes from coverage per box, and total cost estimate for any room. Other
- 09 Gravel Calculate cubic yards and tons of gravel or crushed stone needed from area and depth. Choose rock type for accurate weight, plus bags-vs-bulk toggle and cost estimate. Other
- 10 Insulation Calculate insulation R-value, thickness, and material quantity (bags or batts) by US climate zone per IECC 2021 Table R402.1.2. Covers attic, wall, floor, and crawlspace. Other
- 11 Lumber Calculate board feet and pieces of lumber needed for any project. Enter board dimensions and piece count — includes a 15% waste allowance and optional cost estimate. Other
- 12 Mulch Calculate cubic yards of bulk mulch (or number of 2 cu ft bags) needed to cover any garden bed or landscaped area. Always rounded up. Other
- 13 Paint Calculate how many gallons of paint to buy for any room. Enter wall area, number of coats, and deduct doors and windows — results are rounded up so you never run short. Other
- 14 Pool Volume Calculate swimming pool water volume in gallons and cubic feet for rectangular, oval, and round pools. Includes fill time estimate based on your hose flow rate. Other
- 15 Roofing Calculate squares of shingles, underlayment rolls, and ridge cap bundles needed for any roof from footprint area and pitch. Includes optional cost estimate. Other
- 16 Sand Calculate cubic yards and tons of sand needed from area and depth. Choose sand type for accurate weight estimates, plus bags-vs-bulk toggle and cost estimate. Other
- 17 Square Footage Calculate the exact square footage (or square metres) of a rectangular room or area by entering length and width. Instant, accurate, and unit-aware. Other
- 18 Square Yards Convert room dimensions from square feet to square yards for carpet and flooring orders. Includes waste factor and linear yards estimate for standard 12 ft carpet rolls. Other
- 19 Stair Calculate the number of risers, tread depth, total rise and run, and stringer length for any staircase from floor-to-floor height. Includes IRC 2021 code compliance check. Other
- 20 Tile Calculate how many tiles you need for any room — with automatic waste factor for straight or diagonal layouts. Results are rounded up so you're never short. Other
- 21 Topsoil Calculate cubic yards and bags of topsoil needed for a lawn, garden bed, or raised bed. Instant bulk order quantity, weight estimate, and optional cost estimate. Other
- 22 Wallpaper Calculate how many wallpaper rolls you need from room perimeter, wall height, doors, windows, and pattern repeat. Includes waste for pattern matching. Other
- 23 Window Replacement Estimate window replacement cost, total glass area, and material quantities for your home window replacement project. Enter window count, size, and type for an instant rough estimate. Other
- 01 Base Converter Convert numbers between binary, octal, decimal, and hexadecimal — instantly. Handles 64-bit integers correctly using BigInt (no precision loss above 2^53). Other
- 02 Bitwise Perform AND, OR, XOR, NOT, left-shift, and right-shift on any integers at 8/16/32/64-bit widths — with correct two's-complement signed interpretation. Other