Home and Kitchen100% Free14 tools

Free Home, Kitchen and Electronics Calculators

Scale recipes, convert cups to grams, plan a mortgage, cost an appliance, price a trip, size tires, order flooring and gravel, plan stairs and work out simple circuits. Everything runs in your browser.

Cooking

Cups to Grams ConverterConvert cups and spoons to grams for 23 ingredients. Recipe ScalerScale a pasted ingredient list for new servings. Baker’s Percentage CalculatorBaker’s percentages, hydration and scaling for dough.

Money

Mortgage CalculatorMonthly mortgage payment with tax, insurance and HOA.

Energy

Electricity Cost CalculatorEnergy use and cost of running an appliance.

Auto

Fuel Trip Cost CalculatorFuel needed and cost for a trip, round trip and per person. Tire Size CalculatorDecode tire sizes and compare two sizes.

Home projects

Flooring CalculatorBoxes of flooring needed for a room, with waste allowance. Gravel, Mulch and Topsoil CalculatorVolume, weight and bags of gravel, mulch, soil or sand. Staircase CalculatorSteps, riser, tread, run, angle and stringer for a staircase.

Electronics

AWG Wire Gauge CalculatorAWG to diameter, area and resistance, or diameter to AWG. Resistor Color Code CalculatorRead resistor value and tolerance from the color bands. Ohm’s Law CalculatorFind voltage, current, resistance and power from any two. LED Resistor CalculatorResistor value, power and nearest E12 value for an LED.

How These Calculators Work

Every calculator on this site runs in your browser with JavaScript. The numbers you enter are processed on your own device and are not uploaded or stored. No outside service is used. Each tool shows the answer with its working, and results are estimates to check before you buy materials or rely on safety figures.

Which Calculator Should I Use?

Kitchen: the cups to grams converter, the recipe scaler and the baker’s percentage calculator.
Money and energy: the mortgage calculator and the electricity cost calculator.
Cars: the fuel trip cost calculator and the tire size calculator.
Home projects: the flooring calculator, the gravel and mulch calculator and the staircase calculator.
Electronics: Ohm’s law, the LED resistor calculator, the resistor color code calculator and the AWG wire gauge calculator.

More free tools: finance and health calculators, unit converters and math calculators. For the science behind cooking weights, see the Wikipedia article on cooking measures.