Percentage calculator
Find a percentage of any number, without the mental math.
Numbers & calculationsTools Hubby Digital Shift
Always free to useDigital Shift
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Numbers & calculations
Convert measurement units, calculate percentages and work through everyday arithmetic. Explore geometry, number sequences, proportions and simple estimates.
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A thoughtfully organised collection. Ready when you are.
Numbers & calculations32
32 tools ready to use
Unit converter
Convert 246 units across everyday, scientific and engineering measurements.
Numbers & calculationsRandom number generator
Generate random whole numbers within your chosen range.
Numbers & calculationsGCD & LCM
Find the greatest common divisor and least common multiple of positive whole numbers.
Numbers & calculationsPrime number checker
Check a number or list, find primes in a range, and explore factors and nearby primes.
Numbers & calculationsFibonacci sequence
Generate the first terms of the Fibonacci sequence as exact integers.
Numbers & calculationsScientific notation
Express a number in scientific notation with a coefficient and power of ten.
Numbers & calculationsRoman numeral converter
Convert whole numbers from 1 to 3,999 to Roman numerals, or Roman numerals back to numbers.
Numbers & calculationsModulo calculator
Calculate a nonnegative modulo result with a positive divisor.
Numbers & calculationsTriangle calculator
Calculate perimeter and area from three valid triangle side lengths.
Numbers & calculationsCircle calculator
Calculate a circle's diameter, circumference and area from its radius.
Numbers & calculationsRectangle calculator
Find a rectangle's area, perimeter and diagonal from its width and height.
Numbers & calculationsCompound growth calculator
Estimate mathematical growth from an initial amount, constant annual rate and number of years.
Numbers & calculationsBreak-even calculator
Estimate break-even units from fixed costs, selling price and cost per unit.
Numbers & calculationsRunning pace calculator
Calculate running pace per kilometre and speed from distance and elapsed minutes.
Numbers & calculationsTravel time calculator
Estimate travel duration from distance in kilometres and a constant speed in km/h.
Numbers & calculationsDownload time estimator
Estimate download duration from a file size in MB and connection speed in Mbps.
Numbers & calculationsOpen a tool. Get it done.
Always free to useOn your device. Under your control.
Every calculation, conversion and image edit happens in your browser. Your files and text never leave this device.
Made for everyday work
- Free to use, with no account required.
- Your files and entered values are processed in your browser and are not uploaded for processing. The website and any required processing engines still download from the site.
- Use a current browser with JavaScript enabled. Available formats and speed depend on your browser, device and input size.
Questions & answers
Are the tools free and do I need an account?
All listed tools are free to use without an account. Open a tool, try its example, then enter your own values or select a local file.
Where do my files and entered data go?
Your files and entered values are processed in your browser and are not uploaded for processing. The website and any required processing engines still download from the site.
Do I need to install an application?
No application installation is required. Use a current browser with JavaScript enabled. Some media, PDF and background-removal tools download processing engines when first opened; processing speed depends on your device.