Math tools

Calculators, percentages, and number crunchers.

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Perform AND, OR, XOR, NOT, and shift operations across binary, decimal, and hex with a bit-by-bit view.

See how much an investment grows over time with compounding and optional regular contributions.

Convert lat/lon between decimal degrees and DMS, or compute the great-circle distance between two points.

Find the sale price after one or more stacked discounts, with optional tax.

Calculate monthly payments, total interest, and a full amortization schedule for any loan.

Validate any number with the Luhn algorithm and detect common card brands by IIN range.

Estimate your monthly PITI — principal, interest, property tax, insurance, and PMI.

Six modes of percent: X% of Y, what % is X of Y, % change, markup, margin, and ratio simplifier.

Find out how much to save each month to hit a target — or what your savings will be worth.

A calculator that understands expressions, percentages, and unit conversions like '12ft to cm' or '15% of 240'.

Add tip, tax, and split the bill between any number of people.