Free, no-nonsense calculators
Fast, focused tools for everyday math — no sign-up, no clutter. Pick a category below to get started.
Everyday
Percentage Calculator
Find a percentage of a number, what percent one number is of another, or percent change.
Age Calculator
Calculate exact age in years, months, and days, plus days until your next birthday.
Discount Calculator
Find the final price and total savings on a sale, including stacked discounts and tax.
Finance
Tip Calculator
Work out the tip and split the bill between any number of people.
Mortgage Calculator
Estimate your monthly mortgage payment based on loan amount, rate, and term.
Savings Goal Calculator
Find out how long it'll take to hit a savings target with regular contributions.
Compound Interest Calculator
See how a lump sum grows over time with compound interest.
Should I Refinance Calculator
See your new payment, monthly savings, and break-even point on a refinance.
Debt Payoff Calculator
Plan your debt-free date with the snowball method across as many debts as you have.
Take-Home Pay Calculator
Estimate your net pay per paycheck after federal taxes.
Retirement Savings Calculator
Project your retirement account balance based on contributions and expected return.
Net Worth Calculator
Add up your assets and liabilities to see your net worth, updating live.
Rent Affordability Calculator
Find your recommended max rent using the 30% (or 25%) rule.
Negotiation Leverage Calculator
Score your negotiating position and get guidance on how hard to push.
Salary Negotiation Calculator
Get a recommended counter-offer target and a simple negotiation script.
Home Improvement
Concrete Calculator
Calculate how much concrete you need for a slab, footing, or column.
Paint Coverage Calculator
Figure out how many gallons of paint you need for a room.
Flooring Cost Calculator
Estimate the total cost of new flooring, including a waste buffer.
Mulch and Soil Calculator
Calculate how much mulch or soil you need for a garden bed.
Square Footage Calculator
Calculate total square footage for a rectangular or L-shaped room.
Roofing Cost Calculator
Estimate a total cost range for a new roof based on area, pitch, and material.
Home Offer Negotiation Calculator
Get a suggested initial offer range based on market conditions and days on market.
Health
BMI Calculator
Calculate your Body Mass Index from your height and weight.
Calorie Needs Calculator
Estimate your daily maintenance calories based on your activity level.
Body Fat Percentage Calculator
Estimate your body fat percentage using the U.S. Navy method.
Water Intake Calculator
Find your recommended daily water intake based on weight and activity.
Pregnancy Due Date Calculator
Estimate your due date and current week of pregnancy from your last period.
TDEE Calculator
Calculate your Total Daily Energy Expenditure based on activity level.
Ideal Weight Calculator
See your ideal weight range using the Hamwi and Devine formulas side by side.
Healthy Weight Range Calculator
Find your healthy weight range from BMI, adjusted for activity level.
Auto
Gas Mileage Calculator
Figure out your vehicle's fuel efficiency and estimated fuel costs.
Lease vs. Buy Calculator
Compare the total cost of leasing versus buying a vehicle.
Auto Loan Payment Calculator
Calculate your monthly car payment and total interest paid.
Car Affordability Calculator
Find the maximum vehicle price that fits your monthly budget.
Car Price Negotiation Calculator
Get a target offer price and an opening script for negotiating a car deal.