Utility & Math

Percentage Calculator

Use the Percentage Calculator to get a fast, readable percentage result with inputs, a clear answer, and the formula shown below.

Percentage Change Calculator

Use the Percentage Change Calculator to get a fast, readable percentage change result with inputs, a clear answer, and the formula shown below.

Fraction Calculator

Use the Fraction Calculator to get a fast, readable fraction result with inputs, a clear answer, and the formula shown below.

Ratio Calculator

Use the Ratio Calculator to get a fast, readable ratio result with inputs, a clear answer, and the formula shown below.

Average Calculator

Use the Average Calculator to get a fast, readable average result with inputs, a clear answer, and the formula shown below.

Median Calculator

Use the Median Calculator to get a fast, readable median result with inputs, a clear answer, and the formula shown below.

Random Number Generator

Use the Random Number Generator to get a fast, readable random number generator result with inputs, a clear answer, and the formula shown below.

Tip Split Calculator

Use the Tip Split Calculator to get a fast, readable tip split result with inputs, a clear answer, and the formula shown below.

Fuel Cost Calculator

Use the Fuel Cost Calculator to get a fast, readable fuel cost result with inputs, a clear answer, and the formula shown below.

MPG Calculator

Use the MPG Calculator to get a fast, readable mpg result with inputs, a clear answer, and the formula shown below.

Electricity Cost Calculator

Use the Electricity Cost Calculator to get a fast, readable electricity cost result with inputs, a clear answer, and the formula shown below.

Inflation Calculator

Use the Inflation Calculator to get a fast, readable inflation result with inputs, a clear answer, and the formula shown below. A local CPI table is included so the calculator works without live data.

Grilling Calculator

Estimate grill times by food, thickness, doneness, grill temperature, cooking style, and lid position. Save favorites and run multiple cook timers.

Battery Runtime Calculator

Estimate how long a battery, power bank, UPS, lantern, or medical-device battery can run a critical load.

Power Station Load Calculator

Add up critical device loads and estimate how long a portable power station can keep them running.

Generator Fuel Runtime Calculator

Estimate generator runtime from fuel on hand, fuel burn rate, reserve fuel, and planned daily run hours.

Fridge / Freezer Safety Timer

Track power-outage time against basic refrigerator and freezer food-safety planning windows.

Emergency Water Supply Calculator

Estimate how many days your stored water covers for people and pets.

Emergency Food Supply Calculator

Estimate how many days shelf-stable food covers based on household calories.

Evacuation Fuel Range Calculator

Estimate usable driving range from fuel on hand, MPG, traffic/load penalty, and reserve miles.

Trip Budget Calculator

Use the Trip Budget Calculator to get a fast, readable trip budget result with inputs, a clear answer, and the formula shown below.

Daily Travel Spend Calculator

Use the Daily Travel Spend Calculator to get a fast, readable daily travel spend result with inputs, a clear answer, and the formula shown below.

Baggage Weight / Fee Calculator

Use the Baggage Weight / Fee Calculator to get a fast, readable baggage weight / fee result with inputs, a clear answer, and the formula shown below.

Rental Car vs Rideshare Calculator

Use the Rental Car vs Rideshare Calculator to get a fast, readable rental car vs rideshare result with inputs, a clear answer, and the formula shown below.

Lodging Cost Split Calculator

Use the Lodging Cost Split Calculator to get a fast, readable lodging cost split result with inputs, a clear answer, and the formula shown below.