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22 free calculators · No sign-up

Free online calculators for everyday decisions

Fast, accurate answers with the formula and a worked example on every page.

PopularCGPA to percentage Deck material Deck stain Fence material Post-hole concrete

Deck material calculatorLive example25stock boards12 × 10 ft deck · 12 ft boards · 10% waste

Deck surface120 ft²

Estimated cost$375.00

Try this calculator

Clear formulasEvery result shows the math behind it.
Worked examplesStep-by-step examples you can check.
Metric & imperialSwitch units without retyping.
Download & printKeep a copy of your result.

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Home & DIY

Decks, fences, concrete, roofing, lumber & drywall.

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Deck material calculatorDecking boards, waste and cost for a rectangular deck.Deck stain calculatorStain quantity from area, coats and coverage.Fence material calculatorPickets, posts and rails for a straight fence run.Post-hole concrete calculatorConcrete bags for round holes with square or round posts.Roof pitch calculatorPitch, angle and sloped length from rise and run.Board foot calculatorBoard feet and total cost for lumber.Paver patio calculatorEstimate pavers, base, bedding sand and material costs for a rectangular patio.Raised-bed soil calculatorCalculate soil volume, bags and bulk material cost for matching rectangular garden beds.Fence stain calculatorEstimate fence stain for one or both faces, with editable coverage and edge allowances.Gravel driveway calculatorEstimate gravel volume, metric tonnes, US short tons and delivered material cost.Concrete Figuring CalculatorUse this concrete figuring calculator to estimate rectangular slab volume in cubic yards, cubic feet and cubic meters, plus bags from your product’s mixed yield.Square footage calculatorFind rectangular area in square feet, square meters and square yards.Mulch calculatorMulch, topsoil and compost volume in cubic yards and bags.Drywall calculatorEstimate drywall sheets (4x8, 4x12), screws, tape and joint compound.Paint & primer calculatorEstimate paint gallons, quarts and primer for room walls and ceilings.Tile & flooring calculatorEstimate tiles, square footage, boxes and cutting waste.

Education

CGPA, grades and percentage conversions.

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CGPA to percentage calculatorConvert CGPA to percentage with CBSE, VTU, 10-point or any-scale formulas.SGPA calculatorCalculate semester GPA from course credits and grade points.CGPA from SGPA calculatorCombine semester SGPAs using applicable credits or confirmed equal credits.Target CGPA calculatorFind the future grade-point average needed to reach your cumulative CGPA goal.

Finance

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Transparent growth projections with explicit assumptions.

Compound interest calculatorInitial amount, monthly contributions, growth table and CSV download.CD calculatorEstimate certificate-of-deposit maturity value from an APY, deposit and term.How long will my money last calculatorCalculate how long your retirement savings will last with returns and withdrawals.How much house can I affordCalculate maximum home purchase price and mortgage borrowing capacity.Loan & amortization calculatorCalculate monthly payments, interest, and amortization.Salary to hourly calculatorConvert annual salary to hourly rate, weekly pay, and bi-weekly paycheck.

How it works

Three steps to a clear answer

Pick a calculatorSearch or browse by category to find the right tool.
Enter your numbersResults update as you type. Switch between metric and imperial any time.
Use the answerSee the formula and a worked example, then download or print your result.

Learn the method

Guides

5 min readHow to plan deck materialsStart with the layout, then count the boards.4 min readYour fence materials checklistPosts, rails and pickets, one straight run at a time.4 min readHow much concrete goes in a post hole?Hole volume, post displacement and bag yield.

Why Velour Trends

Calculators you can check

Most online calculators give you a number and nothing else. Every Velour Trends calculator shows the formula it used, a worked example you can follow by hand and the assumptions that could change the answer. If your board, university or product uses a different rule, you can see the difference and choose the right one.

The tools run in your browser, so nothing you type is stored, and you do not need an account. We started with home and DIY projects such as decks, fences, concrete and roofing, added education tools such as the CGPA to percentage calculator, and we keep adding calculators for everyday decisions.

Mathematics

Arithmetic, algebra and graphs with transparent methods.

Fraction calculatorAdd, subtract, multiply or divide two fractions and simplify the exact result.Quadratic factoring calculatorFind real roots and a real linear factorization of ax² + bx + c.Pythagorean theorem calculatorFind a missing side of a right triangle using a² + b² = c².