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Engine RPM from MPH CalculatorCalculate engine RPM at any speed from your gear ratio, final drive ratio, and tire diameter. Free RPM-from-MPH calculator with worked example.
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Air-Fuel Ratio (AFR) CalculatorConvert lambda (λ) to air-fuel ratio (AFR) for gasoline, ethanol, diesel and more. Find rich, lean or stoichiometric mixtures instantly.
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Total Square Footage Calculator (Multiple Rooms)Add up the square footage of multiple rooms at once. Enter each room's length and width to get total square feet, square yards, and square meters.
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Laminate Flooring CalculatorCalculate how many boxes of laminate flooring you need. Enter room size, waste allowance and coverage per box to get exact boxes and total area.
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Square Feet to Yards of Concrete CalculatorConvert square feet and slab thickness into cubic yards of concrete needed for your pour. Free, fast estimator with a 10% waste allowance.
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Flooring Cost per Square Foot CalculatorEstimate your total flooring material cost. Enter room dimensions, price per square foot, and a waste factor to budget your project accurately.
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Gallons of Water in Pool CalculatorCalculate how many gallons of water fill your swimming pool. Enter length, width, and average depth in feet for an instant US gallon estimate.
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Square Footage Cost CalculatorCalculate total project cost from square footage. Enter length, width, and price per square foot to estimate flooring, paint, tile, or material costs fast.
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Square Feet to Cubic Feet CalculatorConvert square feet to cubic feet instantly. Enter floor area and depth/height to get volume in ft³ (and cubic yards) for concrete, mulch, soil and more.
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EV Cost Per Mile CalculatorCalculate the energy cost per mile of your electric vehicle from its efficiency (miles/kWh) and your electricity rate. See cost per 100 miles and trip cost.
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Floor Area CalculatorCalculate floor area and square footage instantly. Enter length and width to get area in square feet, square meters, and square yards.
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Swimming Pool Surface Area CalculatorCalculate the water surface area of a rectangular swimming pool from its length and width. Get results in square feet and square meters instantly.
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Feet and Inches Fraction CalculatorConvert feet, inches and a fraction into total inches and total feet, then back into a clean feet-inches-fraction reading rounded to 1/2 to 1/32.
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Roof Pitch Area Multiplier CalculatorCalculate actual roof surface area from footprint and pitch. Find the slope multiplier factor for any rise/run pitch like 6/12 or 12/12 instantly.
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Room Perimeter Calculator for Baseboard & TrimCalculate the perimeter of a rectangular room and the linear feet of baseboard or trim you need, minus doorways and plus a waste allowance.
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Gravel Coverage Area CalculatorCalculate how much gravel you need for a project. Enter area, depth, and density to get volume in cubic feet, cubic yards, and tons.
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Ceiling Area CalculatorCalculate ceiling area in square feet from length and width. Get square footage plus square meters and square yards for paint or tile estimates.
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Company Car Benefit-in-Kind (BIK) Tax Calculator (UK)UK company car tax calculator. Enter P11D price, CO₂ BIK percentage and your income tax band to find your annual and monthly benefit-in-kind tax.
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EV vs Gas Cost Comparison CalculatorCompare the cost of charging an electric vehicle against fueling a gas car. Estimate your savings per trip, month, or year by driving electric.
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MPG to L/100km ConverterConvert miles per gallon (US or Imperial) to liters per 100 km instantly. Free MPG to L/100km fuel economy calculator with formula and examples.
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Rational Method Stormwater Runoff CalculatorCalculate peak stormwater runoff with the Rational Method Q=CiA. Enter runoff coefficient, rainfall intensity and drainage area for US (cfs) or SI (m³/s).
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Number of Tiles to Cover a Rectangle CalculatorCalculate how many rectangular tiles you need to cover a rectangular floor or wall, including a waste allowance for cuts and breakage.
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Rectangle Fence Cost CalculatorEstimate the cost to fence a rectangular yard. Enter length, width, and price per foot to get the perimeter and total fencing material cost instantly.
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Rectangle Square Footage Cost CalculatorCalculate the total cost of a rectangular area by multiplying its square footage (length × width) by your price per square foot. Fast and free.
