Calculator Directory

Appliance Wattage Calculator Household Estimate daily and yearly electricity use and operating cost for a household appliance from wattage, or from amps and volts when wattage is not listed. Board Foot Calculator Construction Calculate board-foot volume and optional cost for milled lumber, or compare three named log-rule estimates in a separate mode. Concrete Block Calculator Construction Estimate CMU block count, mortar bags, sand, grout fill, and vertical reinforcement from wall dimensions, openings, block size, and waste allowance. Concrete Calculator Construction Estimate net concrete volume, an order quantity with visible overage, and whole premix bags for common pour shapes. Concrete Mix Calculator Construction Scale a published 1:2:4 nominal-mix material schedule, or scale custom dry parts from a known cement volume. Cumulative GPA Calculator Education Combine term or school GPAs into one cumulative GPA weighted by the credits behind each number. Deck Board Spacing Calculator Construction Fit boards across a clear deck field, solve one even gap, or preserve the entered product gap with equal-width edge-board rips. Decking Calculator Construction Estimate whole deck boards, lineal decking, and fasteners for a straight rectangular deck with every gap and allowance shown. Final Grade Calculator Education Find the score you need on a final exam to reach a target course grade. Floor Joist Calculator Construction Estimate field-joist count, joists to buy, optional rim-board length, and total lineal feet without pretending to size the structure. Framing Calculator Construction Count wall studs and plate boards from wall length and chosen on-center spacing, with rough-opening and purchasing details kept optional. Freight Linear Feet Calculator Business Estimate trailer floor length from handling-unit count, footprint, and accepted stackability; mixed-size and density checks stay optional. GPA Calculator Education Calculate a credit-weighted GPA from course grades and credit hours on a 4.0 scale. GPA to Percentage Calculator Education Convert a reported GPA to one proportional percentage estimate using the reported scale maximum. Grade Calculator Education Calculate your current course grade from weighted categories or from points earned and possible. Gravel Calculator Landscaping Estimate cubic yards, short tons, and bags of crushed stone or gravel from the area and depth. High School GPA Calculator Education Calculate weighted and unweighted high-school GPA together from grades and course levels, with editable school-specific weights. Interquartile Range Calculator Math Calculate Q1, median, Q3, interquartile range, and 1.5 x IQR outlier fences from a pasted data set, with classroom and interpolated quartile methods. Linear Feet Calculator Construction Convert a surface area to the running length of fixed-width material, with raw length kept separate from an optional order allowance. Lumber Calculator Construction Turn a known same-size board count into whole boards to buy, board feet, lineal feet, and optional cost. Lumber Weight Calculator Construction Estimate solid-lumber weight from actual dimensions or board feet, species density, quantity, and moisture content. Mulch Calculator Landscaping Calculate cubic yards and whole bags of mulch from a bed's shape, dimensions, and depth. Paint Calculator Household Estimate the paint volume for one interior room's walls, a ceiling, a whole exterior, or a primer coat, then see a rounded container-size planning example. Confirm which sizes the coating you choose is actually sold in. Percentage Calculator Education Choose the percentage question you want to answer, then enter its two values. Percent change and percent difference remain separate choices. Plywood Calculator Construction Estimate whole plywood sheets for a measured surface, or reverse sheets on hand into usable coverage. Plywood Weight Calculator Construction Estimate per-sheet and stack weight from dimensions, thickness, and a named current industry-average density or custom density. Quiz Grade Calculator Education Turn correct or wrong answers into a quiz percentage, use points for partial credit, or find how many questions you can miss. Rebar Calculator Construction Turn engineer-specified dimensions, cover, spacing, and bar size into bar counts, total length, theoretical stock-length equivalents, and approximate weight. Semester Grade Calculator Education Combine two marking-period grades and a final exam with the exact weights your school uses, or find the final score needed for a target semester grade. Solar Panel Calculator Household Estimate a home solar system size, panel count, roof area, annual generation, annual savings, installed cost, and simple payback period — or forecast yearly output from an existing array. Speed Calculator Everyday Enter any two of distance, time, and speed to solve the third. Time Calculator Everyday Find elapsed time between two clock readings, or add and subtract a duration from a clock time. Time Duration Calculator Everyday Find the elapsed hours and minutes between two clock times, including an overnight span. Tip Calculator Everyday Calculate a tip, the bill total, and an even per-person split from the bill amount and tip percentage. Topsoil Calculator Landscaping Convert a measured lawn or garden area and soil depth into cubic yards, cubic feet, tons, and whole bags of topsoil. Water Hardness Calculator Household Enter any two of calcium, magnesium, and total hardness to solve the third. A total-hardness value by itself can also be converted and classified.