Other Calculators

Calculate your exact age in years, months, weeks, days, hours, and minutes from your date of birth to any target date, plus days until your next birthday.

Calculate the number of days, weeks, months, and years between two dates, including or excluding the end date — great for contracts, projects, and anniversaries.

Add or subtract hours, minutes, and seconds across multiple durations, or split a total time into equal segments — with support for HH:MM:SS style inputs.

Compute grade point average on the 4.0 scale, weighted by credit hours, from letter or numeric grades across any number of courses in a semester or year.

Compute your final class grade from assignment weights and scores, plus the minimum score needed on remaining work to reach a target letter grade or percent.

Generate strong random passwords with configurable length, uppercase, lowercase, numbers, symbols, and excluded ambiguous characters — generated locally in-browser.

Convert between Arabic numbers (1-3999) and Roman numerals (I, V, X, L, C, D, M) with correct subtractive notation — useful for dates, chapters, and outlines.

Estimate total fuel cost for any trip from distance, vehicle fuel economy in MPG or L/100km, and gas or diesel price per gallon or liter at the pump.

Compute the optimal bedtime or wake time based on 90-minute sleep cycles so you wake between cycles feeling refreshed — enter target wake or bed time.

Estimate cubic yards and 60/80 lb bags of concrete needed for a slab, footing, wall, column, or stairs from length, width, and thickness measurements.