Everyday Calculators

MPG Calculator — Miles Per Gallon

Enter miles driven and gallons used to calculate MPG and fuel efficiency in all units.

Speed, Distance and Time Calculator

Enter any two of speed, distance, or time to calculate the third.

Download Speed Calculator — Time to Download

Enter file size (MB) and internet speed (Mbps) to calculate download time.

Aspect Ratio Calculator

Enter width and height to get the aspect ratio, decimal ratio, and scaled dimensions.

Electricity Cost Calculator

Enter appliance wattage, hours per day, and kWh rate to calculate daily and monthly electricity cost.

Reading Time Calculator

Enter word count (or word-count estimate) and reading speed to get reading time.

EV vs Gas Total Cost of Ownership Calculator

Enter both vehicles' purchase prices, your annual miles, and local fuel prices. The calculator returns total cost over your chosen ownership period and the breakeven year.

Cost Per Wear Calculator — Is It Actually Worth It?

Enter item cost, estimated wears per year, and how long you'll own it. Get cost per wear and a quality category.

Sourdough Starter Feeding Ratio Calculator

Enter ratio (e.g. 1:5:5) and total grams of fed starter you want. Get exact amounts of starter, flour, and water.

Coffee Brew Ratio Calculator — By Method

Pick your method, set servings and cup size. Get exact coffee grams and water amounts.

Tattoo Cost Calculator — Estimated Price Range

Enter approximate size in inches, pick complexity, enter the artist's hourly rate. Get total with tip.

Carbon Footprint Per Flight Calculator

Enter distance, passengers, and class. See total CO2, per-passenger amount, and offset trees needed.