Know the cost before you spend.
Estimate energy bills, travel costs, loan payments, salary changes, advertising performance and business profitability with transparent formulas.
Find the calculation you need
Every tool includes an explanation, formula, example and practical limitations.
Energy & Home
Electricity Cost
Appliance electricity cost by hour, day, month and year.
Calculate →Electricity Bill
Estimate a household bill from kWh, rates and charges.
Calculate →Appliance Cost
Monthly and yearly cost of any appliance.
Calculate →AC Running Cost
Estimate air-conditioner running cost.
Calculate →Solar Savings
Annual solar savings and simple payback.
Calculate →Cars & Travel
Fuel Trip Cost
Fuel required and total trip cost.
Calculate →EV Charging Cost
Home EV charging cost including losses.
Calculate →Commute Cost
Monthly and yearly work commute cost.
Calculate →Cost Per Mile
Vehicle variable operating cost per mile.
Calculate →Business
Profit Margin
Profit, margin and markup.
Calculate →Markup
Selling price from cost and target markup.
Calculate →Break-even
Units needed to cover fixed costs.
Calculate →E-commerce Profit
Profit after product, shipping, fees and ads.
Calculate →ROAS
Return on ad spend and break-even ROAS.
Calculate →CPA
Cost per customer or acquisition.
Calculate →Money & Salary
Salary → Hourly
Convert annual salary to hourly pay.
Calculate →Savings Goal
Required monthly and weekly savings.
Calculate →Loan Payment
Monthly payment and total interest.
Calculate →Pay Raise
New salary after a percentage raise.
Calculate →Rent Affordability
Planning range for rent from income.
Calculate →Everyday Math
More than a number.
Each calculator explains its formula, gives a worked example and highlights assumptions that can change the result.
Understand the numbers behind the calculator
Useful explanations for energy, solar, e-commerce and borrowing decisions.
How to Calculate Electricity Cost From Watts and kWh
Understand watts, kWh and electricity rates with a practical appliance-cost formula.
Read guide →How to Estimate Solar Savings and Payback
Understand solar generation, electricity savings and simple payback.
Read guide →How to Calculate E-commerce Profit Per Order
Understand product cost, fulfillment, fees, CPA, ROAS and order-level profitability.
Read guide →How to Compare Loan Payments and Total Interest
Learn how loan amount, interest rate and term affect monthly payment and total repayment.
Read guide →