Free Online Calculators

Estimate cubic yards for patios, slabs, footings, driveways

Calculate board feet for decks, framing, and woodworking

Calculate gallons for walls, ceilings, trim, and exteriors

Plan tile for bathrooms, kitchens, floors with waste factor

Calculate drywall sheets, mud, and tape for any room

Plan mulch coverage for garden beds and landscaping

Estimate gravel for driveways, pathways, and drainage

Calculate roofing squares for shingles, tiles, or metal

Calculate decking boards, joists, screws, and posts for your deck

Plan posts, rails, and pickets for wood or vinyl fencing

Calculate insulation for walls, attics, and energy savings

Calculate gallons for pools and hot tubs

Estimate time, salt, and cost for snow clearing

Calculate seed, bags, and cost for new lawns or overseeding

Calculate payments, interest, and payoff timeline

Compare 15 vs 30-year terms with full amortization

See how savings grow with compound interest over time

Convert salary to hourly, weekly, or monthly pay

Calculate tips and split bills evenly or by item

Calculate ROI for investments, projects, or campaigns

See payment schedule and extra payment impact

See how inflation affects your money over time

Calculate take-home pay after taxes and deductions

Plan debt payoff with snowball or avalanche method

Plan 401k, IRA, and retirement income needs

Calculate monthly car payments and total loan cost

Track fuel costs, MPG, and trip expenses

Calculate tax on purchases in any state

Estimate federal taxes based on income and filing status

Calculate gross and net profit margins for pricing

Set prices with your target markup percentage

See PayPal fees and net received for any payment

Find sales needed to cover costs and make profit

Convert margin to markup and understand the difference

Plan and save for your home down payment

Find out how much house you can afford

See your 2026 federal tax brackets and effective rate

Find out when you will pay off your credit card

Compare the total cost of renting versus buying a home

Project portfolio growth with contributions and dividends

Plan monthly savings to reach your financial goal

Compare lease vs buy with monthly payment breakdown

Track wealth by listing all assets and debts

Check BMI and see where you fall on the health scale

Find daily calories for weight loss, gain, or maintenance

Estimate body fat percentage with simple measurements

Calculate due date and track pregnancy week by week

Get custom protein, carb, and fat goals for your diet

Find optimal bedtime based on sleep cycles

Track fertile window and best days to conceive

Find your daily water needs based on weight and activity

Find your training zones for optimal cardio workouts

Estimate your one rep max from submaximal lifts

Track healthy weight gain during pregnancy

Estimate BAC based on drinks, weight, and time

Calculate pace, speed, and race finish times

Find your Total Daily Energy Expenditure for any activity level

Calculate daily protein needs based on weight, activity, and goals

Find your ideal body weight using multiple medical formulas

Solve equations with trig, logs, and advanced functions

Find exact age in years, months, days, hours, minutes

Calculate final grade and what you need on the exam

Solve any percentage problem: of, increase, decrease

Calculate square footage for rooms, lots, and shapes

Count days between dates or add/subtract time

Calculate final price after discount and total savings

Add work hours for timesheets and invoicing

Solve fraction math and simplify to lowest terms

Calculate semester and cumulative GPA from grades

Convert between metric, imperial, and any units

Convert meeting times across world time zones

Pick random numbers for games, raffles, decisions

Calculate odds, chances, and combinatorics

Count sig figs and round for chemistry and physics

Convert large or small numbers to standard form

Find percent change between two values

Find slope, y-intercept, and graph any line

Find missing side of a right triangle

Calculate any number raised to any power

Find square roots, cube roots, and nth roots

Solve log problems with base 10, e, or custom base

Find LCM for fractions and math problems

Find GCF to simplify fractions and factor numbers

Find mean, median, mode, and range of any data

Analyze data spread with standard deviation

Test statistical significance from z or t scores

Find margin of error for surveys and research

Convert your dog's age to human years by size

Convert shoe sizes between US, UK, EU, and CM

Generate secure passwords with strength analysis

Convert colors between HEX, RGB, and HSL formats

Count words, characters, sentences, and reading time

Estimate gas cost for any trip based on distance and MPG

Calculate how much an appliance costs to run