🧮 Free Online Calculators
Every MakeToolz calculator in one place: construction and material, home and garden, math, dates, health, school, finance and fun. Free, no signup, all in your browser.
✔ 45 free tools✔ No signup✔ No watermark✔ In your browser
This is the full library of free MakeToolz calculators. Work out concrete, gravel and mulch by the cubic yard, sheets of drywall or plywood, paint and wallpaper, the square footage of any shape, ages and date gaps, grades, loan payments and more. Every calculator runs entirely in your browser, shows the working behind the answer, and is completely free with no signup or limits.
Landscaping & Bulk Material Calculators (12)
How much concrete, gravel, soil, mulch, sand or asphalt to order, by the cubic yard, ton or bag.
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Concrete CalculatorFree concrete calculator: get cubic yards, meters, and bag counts for slabs, footings, and round columns.
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Gravel CalculatorGet gravel volume in cubic yards, tons, cubic feet and cost.
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Sand CalculatorFree sand calculator: cubic yards, tons, cubic feet, and cost for any area.
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Topsoil CalculatorFind cubic yards, tons and bags of topsoil for any bed or lawn.
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Mulch CalculatorFree mulch calculator: cubic yards, bags, and cost for any bed with waste percent.
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Asphalt CalculatorFree asphalt calculator: tons, cubic yards, and cost from any dimensions.
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Bitumen CalculatorFree bitumen calculator for asphalt mix tonnes or binder spray quantity.
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Sod CalculatorEstimate sod rolls, pallets, and square yards for your lawn in any unit.
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Paver CalculatorCount pavers for any patio or walkway, plus base sand in cubic yards.
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Square Footage CalculatorFree square footage calculator for any room shape, with cost and waste built in.
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Cubic Yard CalculatorFree cubic yard calculator for soil, gravel, concrete, and mulch with waste allowance.
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Cubic Feet CalculatorFind cubic feet from length, width, and height in any unit, free.
Building & Renovation Calculators (14)
Count the sheets, squares, bundles and pieces for a build, roof, floor or remodel.
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Board Foot CalculatorFree board foot calculator: get total board feet and lumber cost fast.
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Plywood CalculatorFind how many plywood or OSB sheets you need for any area, with waste and cost.
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Drywall CalculatorFree drywall calculator: sheets, joint compound, tape, and screws for any room or wall area.
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Paint CalculatorFree paint calculator: gallons and quarts needed for any room, with coats and openings.
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Wallpaper CalculatorFree wallpaper calculator: single and double rolls for any room with waste.
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Tile CalculatorFind how many tiles and boxes you need for any room, with waste and cost.
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Siding CalculatorFind how many squares of siding you need from wall area or perimeter, with waste.
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Roofing CalculatorFree roofing calculator for squares, shingle bundles, and pitch-adjusted roof area.
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Roof Pitch CalculatorFree roof pitch calculator: x:12 ratio, angle in degrees, slope %, and slope factor.
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Stair CalculatorFree stair calculator: steps, riser height, tread run, and stringer length from total rise.
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Fence CalculatorFree fence calculator for posts, rails, sections, pickets, gates, waste, and cost.
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Brick CalculatorFind bricks and mortar bags for any wall size, brick type, and waste percent.
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Rebar CalculatorEstimate slab rebar: total bars, linear feet, and 20 ft sticks to buy.
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Pool Volume CalculatorFree pool volume calculator: gallons and liters for any pool shape and depth.
Date & Time Calculators (5)
Ages, countdowns and the exact days between two dates.
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Age CalculatorFind your exact age in years, months, days and more.
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Age Difference CalculatorFind the exact age gap between two people in years, months, days and weeks.
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Days Between Dates CalculatorCount the exact days between any two dates.
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Birthday CountdownLive countdown to your next birthday in days, hours, minutes, and seconds
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Half Birthday CalculatorFind your exact half birthday date, weekday, and countdown from any birth date.
Math & Everyday Calculators (5)
Percentages, averages, tips, discounts and ratios in a click.
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Percentage CalculatorSolve the three most common percentage questions.
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Average CalculatorGet the mean, median, mode, sum and range of a list.
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Tip CalculatorCalculate the tip, total and per-person split of a bill.
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Discount CalculatorWork out a sale price and how much you save.
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Aspect Ratio CalculatorResize dimensions while keeping the same aspect ratio.
Health, School & Finance Calculators (4)
BMI, GPA, the grade you need on a final, and loan payments.
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BMI CalculatorWork out your body mass index in metric or imperial units.
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GPA CalculatorCalculate your weighted GPA on the 4.0 scale.
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Final Grade CalculatorFind the exact final exam score you need to hit your target course grade.
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Loan CalculatorEstimate a monthly loan payment, total and interest.
Text & Content Calculators (2)
Reading time and on-screen text size from your own content.
Fun & Novelty Calculators (3)
Just for fun, no lab coat required.
Frequently Asked Questions
Are these online calculators free?
Yes. Every calculator is completely free with no signup, no limits and no watermark, and each one runs right in your browser.
Do the calculators work on a phone?
Yes. All calculators are mobile friendly and run on any device, so you can work them out on a phone, tablet or desktop.
Are my numbers kept private?
Yes. Every calculation happens locally in your browser, so the values you enter are never uploaded or stored.
Which calculator should I use?
Browse by section above. There are calculators for construction and materials, home and garden, dates and time, math, health, school and finance.
More Free Tool Collections
Explore the rest of the MakeToolz toolbox, every tool free and running in your browser.