Calculators,
worked out.

Figure out the tip, split the bill, and round up — with preset and custom tip percentages.

Convert between 30 major currencies using live ECB reference rates, cached for fast repeat lookups.

Calculate monthly payments, total interest, and see an amortization table for any loan.

See how your money grows over time with compound interest and optional monthly contributions.

Work out the sale price after a percent off, or find the real discount between an original and sale price.

Add tax to a subtotal to get the total, or back out the pre-tax price from a tax-inclusive total.

Find your exact age in years, months, days, and hours — plus your next birthday countdown.

Calculate your Body Mass Index with imperial or metric units and see your WHO category.

Find the difference between two dates or add/subtract days, weeks, months, and years.

Calculate pace, distance, or finish time for any run — with 5K, 10K, half, and full marathon presets.

Convert length, weight, volume, temperature, area, speed, and time units instantly.

Convert numbers between binary, octal, decimal, and hexadecimal — instantly and with strict validation.

Calculate percentages five ways — X% of Y, what percent, percentage change, and more.

Simplify a ratio to its lowest terms or solve a proportion A:B = C:D for any missing value.

Add, subtract, multiply, and divide fractions. See the reduced answer plus decimal and mixed-number forms.

Add your courses with letter grades and credits to compute your weighted GPA on the 4.0 scale.

Get mean, median, mode, range, variance, and standard deviation for any list of numbers.