Calculator
Evaluate bounded arithmetic with parentheses and standard operator precedence.
Open calculatorUseful, instant, private
Tools for everyday questions
Supported commands run in your browser and do not call an AI model.
Percentage
Calculate an explicit percentage of a number, with bounded inputs and results.
Open percentage tool Open percentage calculatorTip calculator
Calculate a chosen tip and the bill total locally. No payment or currency conversion is involved.
Calculate in chat Open tip calculatorUnit price comparison
Compare two products per 100 g, 100 ml, or item. Use prices in the same currency; everything is calculated locally.
Compare in chat Open price comparisonDiscount price
Calculate a sale price after one or two successive discounts. The result stays in the currency you choose; everything runs locally.
Open discount calculatorVideo file size
Estimate decimal and binary file sizes from video duration and bitrate. The estimate runs locally and covers the video stream only.
Open video size estimatorRunning pace
Calculate pace per kilometre and average speed from distance and finish time. Everything runs locally.
Calculate in chat Open running pace calculatorPythagorean calculator
Calculate the hypotenuse from two positive side lengths. The result is computed in your browser.
Calculate in chat Open standalone calculatorPercentage change
Compare a positive starting value with a non-negative ending value. The calculation stays in your browser.
Open percentage-change calculatorUnit converter
Convert supported length, mass, temperature, decimal data-storage and fixed time units using clear conversion factors.
Open unit converter Open standalone converterDownload time
Estimate a transfer time from file size in decimal GB and connection speed in Mbps.
Open download-time estimator Open standalone estimatorTravel time
Estimate trip duration from distance and average speed. Stops and traffic are not included.
Calculate in chat Open travel-time calculatorFuel cost
Estimate trip fuel use and cost from distance, consumption and your chosen currency. No exchange rate is applied.
Open fuel-cost calculatorCompound growth
Estimate compounding from a user-entered rate and frequency. Fees, taxes, inflation and risk are not included.
Open compound-growth calculatorLoan payoff estimate
Estimate monthly payoff time, total interest and the adjusted final payment. Uses your fixed rate and payment; no lender fees or rules are included.
Open loan-payoff calculatorHourly rate
Estimate gross and illustrative after-cost hourly rates from monthly income and working assumptions. The calculation stays in your browser.
Open hourly-rate calculatorRecipe scaler
Scale numeric ingredient amounts to a different number of servings. Your recipe stays in this browser.
Open recipe scalerPizza dough calculator
Calculate flour, water, salt and yeast for a target number and weight of dough balls. Everything stays in your browser.
Open pizza dough calculatorConcrete volume
Estimate the volume of a rectangular slab or footing, with an optional waste reserve. The result is only a rough estimate.
Open concrete calculatorAquarium volume
Estimate gross volume from rectangular tank dimensions and see an approximate 90% water volume. This is not stocking or treatment advice.
Open aquarium volume calculatorKinetic energy
Calculate classical kinetic energy from mass and velocity. The result stays in your browser and is not sent to chat.
Open kinetic-energy calculatorAttendance
Calculate attendance percentage from attended and total classes. The result stays in your browser.
Open attendance calculatorTile calculator
Estimate the number of tiles for a surface with a cut and breakage reserve. The result stays in your browser.
Open tile calculatorPassword generator
Generate a random password locally with a cryptographic browser API. The password never enters chat.
Open password generatorText statistics
Count words, characters and lines locally. Your text is never sent to EasyChat.
Open text statisticsJSON formatter
Validate, format or minify JSON locally. Your data is never sent to EasyChat.
Open JSON formatterZ-score calculator
Compare a value with a mean in standard-deviation units. Inputs stay in your browser.
Open Z-score calculatorConfidence interval
Estimate a 95% interval for a mean using a known population deviation. Inputs stay in your browser.
Open confidence-interval calculatorTest grade
Calculate a score percentage and compare it with a pass threshold in your browser.
Open test-grade calculatorWeighted grade average
Calculate a weighted average with editable grade and weight rows. Zero grades count; all values stay in your browser.
Open weighted-grade calculatorDate difference
Count full days between two valid dates in YYYY-MM-DD format.
Open date-difference calculator Open standalone date calculatorThese listed calculations run locally. You can ask other questions in chat; beta AI availability can vary and answers may be wrong.