TotalFree calculators and unit converters
TotalCalc is a collection of free tools for everyday maths: finance and statistics calculators, hundreds of unit converters covering length, weight, volume, temperature, pressure and more, plus live time zone tools. Nothing to install and no sign-up.
Every converter shows the formula it uses, a worked example and a reference table, so you can check the result rather than just trust it. The whole site is available in seven languages.
Most Used
Browse by category
Unit Converters
Convert between millimetres and miles, grams and stones, litres and gallons, Celsius and Fahrenheit, pascals and psi — with a reference table on every page.
Go to Unit ConversionsFinance Calculators
Work out compound interest, loan repayments, return on investment, inflation and the break-even point for a business.
Go to FinanceMath Calculators
Solve quadratic equations, find the area of a circle or triangle, work with fractions, primes, vectors and the Pythagorean theorem.
Go to MathStatistics Calculators
Calculate mean, median and mode, standard deviation, z-scores and the t-statistic for a set of numbers.
Go to StatisticsHealth & Weight
BMI, TDEE and BMR, body fat percentage and ideal weight — with the formula behind each number.
Go to Weight LossOther Calculators
Age and date tools, GPA calculators, tip and discount maths, Roman numerals, ciphers and text encoders.
Go to OtherMath Worksheets
Generate a printable arithmetic worksheet for practice or homework, with an optional answer key.
Go to WorksheetsTime Zone Tools
World Clock
The current local time in major cities on every continent, updated every second.
Go to World ClockTime Zone Converter
Convert a time from one zone to another and see how far apart the two are.
Go to Time Zone ConverterUTC Offset Reference
Every major time zone with its current UTC offset, abbreviation and daylight saving status.
Go to UTC OffsetsMeeting Planner
Pick the zones your team is in and see one moment in all of them, with working hours flagged.
Go to Meeting PlannerOther Great Tools / Apps
Free Bin Checker - Wondering how to enhance the security of your checkout system? FreeBINChecker has it all in the store for you: BIN Lookup, APIs, Latest Update, and more.
9 Builders - Planning a build or remodel? 9 Builders has free construction calculators for the numbers that decide a project: ADU cost and feasibility, room addition and timeline estimates, permit fees, remodel ROI, home value, monthly payments, ADU rental income, square footage, energy savings, and a contractor license lookup. Worth running before you call a contractor, so you walk into the quote knowing what the work should cost.
Drafting Tools - A set of free drafting and permitting tools aimed at the questions that stall a project before drawings even start. You can check whether California requires a Title 24 CF1R for your job, look up your climate zone, test whether an ADU or garage conversion is actually allowed on your lot, and work out setbacks, lot coverage and window-to-wall ratio. There are also estimators for permit fees, drafting fees, sheet counts and timelines, so you can size up the paperwork side of a remodel before committing to it.
NIST Weights and Measures - The U.S. National Institute of Standards and Technology maintains the official definitions behind the units these converters use, if you want the authoritative source rather than just our numbers.