Calcometry
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Everyday calculators
Daily math made fast: tips, bill splits, percentages, discounts, sales tax, fuel cost, loans, age, dates, and time zones.
10 tools in this section
Tip
Calculate tip amount, total bill, and per-person split. Free instant gratuity calculator.
Split Bill
Split a restaurant bill and tip evenly among friends. Free bill splitter.
Percentage
Calculate percentages: what is X% of Y, percent change, increase or decrease. Free online tool.
Discount
Calculate sale price and savings from a discount percentage. Free discount tool.
Sales Tax
Estimate sales tax and total price from subtotal and tax rate. Free quick estimate.
Fuel Cost
Estimate gas cost for a trip from distance, MPG, and fuel price. Free fuel calculator.
Loan Payment
Estimate monthly loan payment from principal, interest rate, and term. Not a mortgage offer.
Age
Calculate exact age in years, months, and days from a birth date. Free age calculator.
Date Difference
Calculate days, weeks, and months between two dates. Free date calculator.
Time Zone
Convert time between UTC offsets for travel and remote meetings. Does not adjust for DST.