Category · 66 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 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
- 03 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
- 04 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 $0.16/kWh. Other
- 05 Fuel Cost Calculate trip fuel cost in seconds. Works in US units (miles/mpg/$/gal) and metric (km/L per 100km/$/L). See total cost, fuel used, and cost per mile or km. Other
- 06 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
- 07 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
- 08 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
- 09 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
- 10 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
- 11 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
- 12 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
- 13 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
- 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