Answers that add up.
Free, straightforward calculators for projects, money, business, travel, and everything in between. Enter your numbers, see the math, make your next decision.
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Useful places to start
Gravel Calculator
Estimate gravel volume, weight, bags, and bulk-versus-bag cost.
Open calculator ↗Loan Payment Calculator
Estimate monthly principal-and-interest payments on a fixed-rate loan.
Open calculator ↗Compound Interest Calculator
Explore hypothetical account growth with monthly deposits and compounding.
Open calculator ↗Ad Revenue RPM Calculator
Estimate advertising revenue from pageviews and page RPM.
Open calculator ↗Wall Paint Calculator
Estimate gallons and purchase cost for painting four rectangular room walls.
Open calculator ↗Road Trip Fuel Cost Calculator
Estimate driving fuel, cost, and price per traveler.
Open calculator ↗Explore all calculators
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Gravel Calculator
Estimate gravel volume, weight, bags, and bulk-versus-bag cost.
Open calculator ↗Concrete Calculator
Estimate slab concrete in cubic yards and bags from your dimensions.
Open calculator ↗Mulch Calculator
Find cubic yards, bags, and compare bagged mulch to bulk delivery.
Open calculator ↗Topsoil Calculator
Calculate the soil volume and approximate weight for a new garden bed.
Open calculator ↗Paver Calculator
Estimate paving stones and costs using your patio dimensions.
Open calculator ↗Wall Paint Calculator
Estimate gallons and purchase cost for painting four rectangular room walls.
Open calculator ↗Fence Materials Calculator
Estimate panels, posts, and material costs for a straight fence run.
Open calculator ↗Floor Tile Calculator
Calculate how many tile boxes to buy and estimate material cost.
Open calculator ↗Sod Calculator
Estimate sod rolls, area, and cost for a rectangular lawn.
Open calculator ↗Profit Margin Calculator
Calculate profit per unit, total profit, and net contribution margin.
Open calculator ↗Break-even Calculator
Find minimum unit sales needed to cover monthly fixed expenses.
Open calculator ↗Equipment Rental ROI Calculator
Estimate booking revenue, operating profit, and simple equipment payback.
Open calculator ↗Percentage Calculator
Quickly find a percentage of any number and add or subtract it.
Open calculator ↗Tip & Split Bill Calculator
Calculate a tip, the final total, and what each person pays.
Open calculator ↗Unit Price Comparison Calculator
See which package really costs less per unit.
Open calculator ↗Loan Payment Calculator
Estimate monthly principal-and-interest payments on a fixed-rate loan.
Open calculator ↗Compound Interest Calculator
Explore hypothetical account growth with monthly deposits and compounding.
Open calculator ↗Savings Goal Calculator
Find how much to save each month to reach a target amount.
Open calculator ↗Debt Payoff Calculator
Estimate how long a fixed monthly payment could take to repay a balance.
Open calculator ↗Inflation Impact Calculator
Compare the future price of an item under an assumed inflation rate.
Open calculator ↗Markup & Margin Calculator
Compare markup versus profit margin when pricing products.
Open calculator ↗Ad Revenue RPM Calculator
Estimate advertising revenue from pageviews and page RPM.
Open calculator ↗Circle Calculator
Calculate circle area, circumference, and diameter from radius.
Open calculator ↗Triangle Area Calculator
Find triangle area from base and perpendicular height.
Open calculator ↗Pythagorean Theorem Calculator
Find the hypotenuse and angles of a right triangle.
Open calculator ↗Average Calculator
Calculate mean, total, and range from up to five numbers.
Open calculator ↗Aspect Ratio Calculator
Scale a design or image without stretching its proportions.
Open calculator ↗Discount Calculator
Calculate a sale price and the amount you save.
Open calculator ↗Sales Tax Calculator
Add or back out sales tax from a price.
Open calculator ↗Recipe Scaling Calculator
Scale ingredient amounts when cooking for different portions.
Open calculator ↗Time Duration Calculator
Find elapsed minutes and hours between two times on a 24-hour clock.
Open calculator ↗Digital Storage Converter
Convert gigabytes and gibibytes to megabytes and mebibytes.
Open calculator ↗Road Trip Fuel Cost Calculator
Estimate driving fuel, cost, and price per traveler.
Open calculator ↗Travel Time Calculator
Estimate travel duration from distance and average speed.
Open calculator ↗Fuel Economy Converter
Convert MPG to liters per 100 km and compare two vehicles.
Open calculator ↗Running Pace Calculator
Convert a run time and distance into pace and average speed.
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Numbers you can follow.
Each tool shows its basic method and assumptions. Sample prices and rates are examples, not live quotes. For high-stakes decisions, double-check your inputs and verify requirements with a qualified source.