Free Online Calculators for Everyday Decisions

Home Energy →

Electricity Cost Calculator

Estimate how much an appliance costs to run from its power rating, daily usage, and your electricity rate.

Small Business →

Profit Margin Calculator

Calculate profit, profit margin, and markup from cost and selling price.

Pet →

Dog Calorie Calculator

Estimate daily calories for a healthy adult dog from body weight and adult status.

Home Improvement →

Paint Calculator

Estimate wall area, multi-coat coverage, exact gallons, and a rounded-up paint purchase quantity.

Home Energy →

AC Running Cost Calculator

Estimate the daily, monthly, and annual electricity cost of running an air conditioner.

Pet →

Puppy Calorie Calculator

Estimate daily energy needs for a healthy growing puppy using weight and age group.

Home Improvement →

Concrete Calculator

Calculate concrete volume in cubic feet and cubic yards, with an optional ordering allowance.

Small Business →

Break-even Calculator

Estimate unit sales and revenue needed to cover fixed and variable costs.

Pet →

Cat Calorie Calculator

Estimate daily calories for a healthy adult cat from weight and adult status.

Home Energy →

EV Charging Cost Calculator

Estimate electricity drawn from the grid and the cost of charging an EV between two battery levels.

Home Energy →

Solar Payback Calculator

Estimate simple solar payback and net savings over 10 and 20 years using transparent assumptions.

Home Improvement →

Flooring Calculator

Estimate base room area, a selected waste allowance, and total flooring square footage.

Home Improvement →

Roofing Shingle Calculator

Estimate roofing squares, waste-adjusted area, and product-specific bundles.