Useful by design
The right tool.
Right when you need it.
A tidy collection of fast, focused utilities. Find the answer, finish the job, and get on with your day.
Browse toolsNetwork essentials
IT & Networking
Dependable tools for networks, data, and troubleshooting.
What's My IP
See your public IP address and copy it in one click.
Open toolDNS Lookup
Look up common DNS record types with TTL and DNSSEC status.
Open toolCommon Port Reference & Search
Search common TCP and UDP ports by number, service, or use.
Open toolIPv4 Address Converter
Convert IPv4 addresses between decimal, integer, hexadecimal, and binary.
Open toolSubnet Calculator
Calculate IPv4 networks, masks, ranges, and usable hosts.
Open toolIPv6 Subnet Calculator
Calculate IPv6 network boundaries, host bits, and address counts.
Open toolMAC Address Formatter & Analyzer
Normalize MAC address formats and inspect address-type bits.
Open toolSubnet Mask / CIDR Converter
Convert CIDR prefixes, subnet masks, and wildcard masks.
Open toolCIDR Calculator & IP Range Converter
Convert between CIDR blocks and exact IPv4 address ranges.
Open toolDownload Time Calculator
Estimate transfer time from file size and connection speed.
Open toolBandwidth Converter
Convert common network and data-rate units without guesswork.
Open toolEveryday math
Calculators
Clear, practical calculations for everyday questions.
Percentage Calculator
Calculate percentages, proportions, and percentage change.
Open toolTip Calculator
Calculate a tip, split the bill, and optionally round up.
Open toolDiscount Calculator
Find savings and final price for percentage or fixed discounts.
Open toolAverage Calculator
Find mean, median, sum, count, minimum, maximum, and range.
Open toolDate Difference Calculator
Calculate elapsed days, complete weeks, and inclusive days between dates.
Open toolAge Calculator
Find exact age in completed years, months, and days on any date.
Open toolSales Tax Calculator
Calculate sales tax, subtotal, final total, and per-item cost.
Open toolUnit Price Calculator
Compare two package prices and find the lower cost per unit.
Open toolFuel Cost Calculator
Estimate trip fuel use, total cost, and cost per distance.
Open toolLoan Payment Calculator
Estimate monthly principal-and-interest payments and loan totals.
Open toolCompound Interest Calculator
Project compound growth, regular contributions, and interest earned.
Open toolMeasurements made easy
Converters
Move between familiar units and formats without doing the math by hand.
Length Converter
Convert metric, US, imperial, and nautical length units.
Open toolWeight Converter
Convert metric and US/imperial weight units, including distinct tons.
Open toolTemperature Converter
Convert Celsius, Fahrenheit, Kelvin, and Rankine temperatures.
Open toolVolume Converter
Convert metric, cubic, US liquid, and imperial volume units.
Open toolArea Converter
Convert square metric and imperial units, acres, and hectares.
Open toolSpeed Converter
Convert mph, km/h, m/s, ft/s, and knots.
Open toolTime Duration Converter
Convert milliseconds, seconds, minutes, hours, days, and weeks.
Open toolData Storage Converter
Convert bits, bytes, decimal storage units, and binary storage units.
Open toolFuel Economy Converter
Convert US and Imperial mpg, L/100 km, and km/L.
Open toolPressure Converter
Convert Pa, kPa, MPa, bar, psi, atm, and mmHg.
Open toolEnergy Converter
Convert joules, watt-hours, calories, BTU, and foot-pounds.
Open toolPower Converter
Convert watts, horsepower, BTU per hour, and foot-pounds per second.
Open toolForce Converter
Convert newtons, pound-force, kilogram-force, dynes, and poundals.
Open toolTorque Converter
Convert newton-meters, pound-feet, pound-inches, and kilogram-force torque.
Open toolAcceleration Converter
Convert metric, imperial, velocity-change, standard gravity, and Gal units.
Open toolDensity Converter
Convert metric and US customary mass-per-volume density units.
Open toolAngle Converter
Convert degrees, radians, gradians, turns, arcminutes, and arcseconds.
Open toolFrequency Converter
Convert hertz, SI frequency units, cycles per minute, RPM, and radians per second.
Open toolFlow Rate Converter
Convert metric, US gallon, and cubic-feet-per-minute volume flow rates.
Open toolCook by measure
Kitchen
Ingredient-aware conversions for cooking, baking, metric measures, and US kitchen units.
Cups to Grams & Ingredient Converter
Convert common ingredients between kitchen volume and weight units.
Open toolRecipe Scaling Calculator
Resize every ingredient for a different number of servings.
Open toolOven Temperature Converter
Convert conventional, fan, Fahrenheit, Celsius, and gas-mark oven settings.
Open toolBaking Pan Size Converter
Compare pan capacity and calculate a recipe multiplier for a different pan size.
Open toolDough Hydration Calculator
Calculate dough hydration and baker's percentages from ingredient weights.
Open toolSourdough Starter Feeding Calculator
Calculate starter, flour, and water for any sourdough feeding ratio.
Open toolPizza Dough Calculator
Calculate exact ingredient weights for any number of pizza dough balls.
Open toolCoffee-to-Water Ratio Calculator
Calculate coffee and water amounts for any brew ratio.
Open toolEgg Size Converter
Convert egg counts between USDA shell-egg size classes.
Open toolYeast Conversion Calculator
Convert weights between active dry, instant, and fresh cake yeast.
Open toolBaker's Percentage Calculator
Convert baker's percentages to weights or analyze a formula by weight.
Open toolRecipe Cost Calculator
Calculate ingredient, recipe, and per-serving costs from package prices.
Open toolRice-to-Water Ratio Calculator
Calculate cooking liquid and estimated yield for common rice types.
Open toolWater Temperature Mixing Calculator
Mix hot and cold water amounts to reach a target temperature.
Open toolSimple on purpose
Built to load quickly, respect your attention, and give you a useful answer without getting in the way.