Everyday

Tips and quick practical math.

Money

Tip CalculatorTip amount, total and per-person split.Percent Off CalculatorSale price after a percentage discount.

Tax

Sales Tax CalculatorAdd or remove sales tax.VAT CalculatorAdd or remove value-added tax.

Fuel & auto

Gas Mileage CalculatorFuel economy from distance and fuel used.Fuel Cost CalculatorTrip fuel cost and per-mile cost.

Energy

Electricity Cost CalculatorRunning cost of any appliance.

Heating & cooling

BTU CalculatorHeating/cooling capacity for a room.

Weather

Wind Chill CalculatorFeels-like temperature in wind.Heat Index CalculatorFeels-like temperature in heat.Dew Point CalculatorDew point from temperature and humidity.

Home & construction

Square Footage CalculatorArea of a room or property.Concrete CalculatorSlab, wall, column, round-slab and stair concrete estimates.Roofing CalculatorRoof area and material in squares.Tile CalculatorHow many tiles do you need?

Outdoor

Mulch and Gravel CalculatorBulk mulch or gravel volume and weight.Cubic Yards CalculatorHow much material do you need to fill an area?

School

GPA CalculatorTerm GPA, cumulative GPA and planning with credits.Grade CalculatorWeighted grade and what you need on the final.