Search calculators

• Mortgage CalculatorFinance · Monthly payment & amortization
• Loan CalculatorFinance · Repayment schedule & total interest
• Compound Interest CalculatorFinance · Growth of savings over time
• Savings CalculatorFinance · Reach a savings goal
• Sales Tax CalculatorTax & Pay · Tax and total for any price
• Mileage Reimbursement CalculatorTax & Pay · 2026 IRS mileage rates for business and more
• Salary to Hourly CalculatorTax & Pay · Convert pay between periods
• Gravel CalculatorConstruction & Home · Tons & cubic yards for driveways
• Concrete CalculatorConstruction & Home · Cubic yards, bags & cost estimate
• Mulch CalculatorConstruction & Home · Cubic yards for garden beds
• Asphalt CalculatorConstruction & Home · Tons for paving
• Paver Base CalculatorConstruction & Home · Sand & stone base
• Tile CalculatorConstruction & Home · Tiles and boxes for floors and walls
• Roof Pitch CalculatorConstruction & Home · Pitch, angle and slope
• Cubic Yard CalculatorConstruction & Home · Volume in cubic yards
• Baseboard CalculatorConstruction & Home · Trim length and pieces
• Watt-Hour CalculatorConstruction & Home · Battery energy and runtime
• Plant Spacing CalculatorConstruction & Home · Plants per bed
• Mortar CalculatorConstruction & Home · Bags for blocks and bricks
• AC Size CalculatorConstruction & Home · BTU for a room air conditioner
• Pool Salt CalculatorConstruction & Home · Salt to add to a pool
• Coefficient of Variation CalculatorMath & Statistics · CV as a percentage of the mean
• Expected Value CalculatorMath & Statistics · Mean of a discrete distribution
• Fat Intake CalculatorHealth & Fitness · Daily fat range in grams
• Fiber Intake CalculatorHealth & Fitness · Daily fiber goal
• Board Foot CalculatorConstruction & Home · Lumber volume in board feet
• Brick CalculatorConstruction & Home · Bricks for a wall
• T-Test CalculatorMath & Statistics · One, two-sample and paired
• IQR CalculatorMath & Statistics · Quartiles and outliers
• Adjusted Age CalculatorHealth & Fitness · Corrected age for preemies
• Weight Loss Percentage CalculatorHealth & Fitness · Percent of body weight lost
• 50/30/20 Budget CalculatorFinance · Needs, wants and savings
• Plywood CalculatorConstruction & Home · Sheets of plywood needed
• Roofing CalculatorConstruction & Home · Squares and shingle bundles
• Watts to Amps CalculatorConstruction & Home · Convert watts and amps
• Standard Error CalculatorMath & Statistics · SE of the mean and confidence interval
• Max Heart Rate CalculatorHealth & Fitness · Maximum heart rate by age
• LED Resistor CalculatorConstruction & Home · Series resistor for an LED
• Pool Volume CalculatorConstruction & Home · Gallons and liters in a pool
• Rainwater Harvesting CalculatorConstruction & Home · Rainwater collected from a roof
• Potting Soil CalculatorConstruction & Home · Potting mix for pots
• Cat Age CalculatorPets · Cat years to human years
• Dog Age CalculatorPets · Dog years to human years
• Dog Pregnancy CalculatorPets · Due date and gestation range
• Percent Error CalculatorMath & Statistics · Error against an accepted value
• Cohen's d CalculatorMath & Statistics · Effect size for two groups
• Cubic Inch CalculatorConstruction & Home · Volume and conversions
• CFM CalculatorConstruction & Home · Airflow for a room or duct
• Exterior Paint CalculatorConstruction & Home · Gallons for a house
• Hours Worked CalculatorEveryday & Auto · Timesheet totals
• GPA CalculatorSchool & Grades · Weighted and unweighted GPA
• Time to Decimal CalculatorEveryday & Auto · Convert hours and minutes to decimal hours and back
• Projectile Motion CalculatorScience & Physics · Range, flight time and maximum height of a projectile
• Engine Displacement CalculatorEveryday & Auto · Swept volume of an engine from bore, stroke and cylinders
• Electricity Cost CalculatorEveryday & Auto · Cost of running an appliance from watts, hours and rate
• Days Between Dates CalculatorEveryday & Auto · Days, weeks and weekdays between two dates
• Elapsed Time CalculatorEveryday & Auto · Time between a start and an end
• Timecode CalculatorEveryday & Auto · Add or subtract video timecodes, with drop-frame
• Dog Heat Cycle CalculatorPets · Estimate when your dog's next heat may start
• Unit Price CalculatorEveryday & Auto · Compare price per ounce, pound or liter
• EV Charging Cost CalculatorEveryday & Auto · Cost to charge an electric car and cost per mile
• Test Score CalculatorSchool & Grades · Percent score and letter grade from questions wrong
• Hours From Now CalculatorEveryday & Auto · Date and time a number of hours from now
• Force CalculatorScience & Physics · Force, mass or acceleration from F = m × a
• Acceleration CalculatorScience & Physics · Acceleration from speed change, force or distance
• Kinematics CalculatorScience & Physics · Solve constant-acceleration motion problems
• Speed Distance Time CalculatorScience & Physics · Speed, distance or time from the other two
• Ideal Gas Law CalculatorScience & Physics · Solve PV = nRT for pressure, volume, moles or temperature
• Semester Grade CalculatorSchool & Grades · Weighted semester grade from periods and an exam
• Cumulative GPA CalculatorSchool & Grades · New cumulative GPA after this term
• Compression Ratio CalculatorEveryday & Auto · Static engine compression ratio from its dimensions
• Grams to Cups CalculatorEveryday & Auto · Convert grams to cups for baking ingredients
• Average Time CalculatorEveryday & Auto · Average of a list of times, laps or splits
• Dog Food CalculatorPets · Daily calories and cups of food for a dog
• Final Grade CalculatorSchool & Grades · Score needed on the final to reach a target grade
• Pizza Dough CalculatorEveryday & Auto · Flour, water, salt and yeast for pizza dough balls
• Inflation CalculatorFinance · What an amount is worth in another month, by CPI
• ROI CalculatorFinance · Return on investment and annualized return
• Overtime CalculatorTax & Pay · Weekly pay with time-and-a-half overtime
• Bonus Tax CalculatorTax & Pay · Tax withheld from a bonus and the net amount
• 403(b) CalculatorFinance · Project your 403(b) balance with IRS limits
• TSP CalculatorFinance · Project your Thrift Savings Plan balance
• Retirement Withdrawal CalculatorFinance · How long your savings last with yearly withdrawals
• Markup CalculatorFinance · Markup and margin from cost and price
• CD CalculatorFinance · Interest and balance of a certificate of deposit
• Dividend CalculatorFinance · Dividend income and reinvestment projection
• Dollar Cost Averaging CalculatorFinance · Average cost per share when investing regularly
• 457(b) CalculatorFinance · Project your 457(b) balance with IRS limits
• 401(k) Match CalculatorFinance · Employer match and money left on the table
• Effective Tax Rate CalculatorTax & Pay · 2026 federal tax, effective and marginal rate
• Cost Basis CalculatorFinance · Average cost per share and gain or loss on a sale
• 529 College Savings CalculatorFinance · Project a 529 balance against future college costs
• Car Payment CalculatorFinance · Monthly car payment with tax, down payment and trade-in
• Refinance CalculatorFinance · Monthly saving and break-even of a refinance
• Home Sale Proceeds CalculatorFinance · Net proceeds from selling a house
• Multiplying Polynomials CalculatorMath & Statistics · Expand the product of two polynomials
• Zeros of a Function CalculatorMath & Statistics · Real and complex zeros of a polynomial
• Slope CalculatorMath & Statistics · Slope, equation and distance between two points
• Square Root CalculatorMath & Statistics · Square and nth roots, with simplified radicals
• Decimal CalculatorMath & Statistics · Exact decimal addition, subtraction, multiplication and division
• Cylinder Volume CalculatorMath & Statistics · Volume and surface area of a cylinder
• Interval Notation CalculatorMath & Statistics · Convert inequalities and interval notation
• APR CalculatorFinance · Annual percentage rate with fees counted
• Loan Recast CalculatorFinance · New payment after a lump-sum recast
• PMI CalculatorFinance · Private mortgage insurance cost and removal
• Line of Credit Interest CalculatorFinance · Interest and payoff time on a line of credit
• Pythagorean Theorem CalculatorMath & Statistics · Hypotenuse or missing leg of a right triangle
• Inverse Tangent CalculatorMath & Statistics · Arctan and atan2 in degrees and radians
• Golden Ratio CalculatorMath & Statistics · Split a length in the golden proportion
• Sector Area CalculatorMath & Statistics · Area of a circular sector
• Arc Length CalculatorMath & Statistics · Length of a circular arc
• Vertex Form CalculatorMath & Statistics · Convert a quadratic to vertex form
• Parabola CalculatorMath & Statistics · Vertex, focus and intercepts of a parabola
• Exponential Growth CalculatorMath & Statistics · Growth or decay at a steady rate
• Geometric Sequence CalculatorMath & Statistics · nth term and sum of a geometric sequence
• Two-Step Equation CalculatorMath & Statistics · Solve ax + b = c step by step
• Integer CalculatorMath & Statistics · Signed whole-number arithmetic
• Order of Operations CalculatorMath & Statistics · Evaluate an expression step by step
• Sigma Notation CalculatorMath & Statistics · Sum an expression over a range
• Battery Runtime CalculatorConstruction & Home · How long a battery bank runs a load.
• Solar Panel Angle CalculatorConstruction & Home · Best tilt and direction for fixed solar panels.
• Solar Panel Output CalculatorConstruction & Home · kWh per day, month and year from your panels.
• Battery Charge Time CalculatorConstruction & Home · Hours to charge a battery from a charger or solar.
• UPS Runtime CalculatorConstruction & Home · Backup minutes and the VA size to buy.
• Solar Battery Bank CalculatorConstruction & Home · Size a battery bank in Ah and battery count.
• Inverter Size CalculatorConstruction & Home · Continuous and surge watts for your loads.
• Solar System Size CalculatorConstruction & Home · Array size in kW and panels for your usage.
• Solar Panel Cost CalculatorConstruction & Home · Cost range from system size and price per watt.
• Solar Payback CalculatorConstruction & Home · Years for solar savings to repay the cost.
• Off-Grid Solar CalculatorConstruction & Home · Size panels, batteries and inverter from your loads.
• Solar Loan CalculatorFinance · Monthly payment and interest on a solar loan.
• Sand CalculatorConstruction & Home · Cubic yards and tons of sand
• Stone CalculatorConstruction & Home · Landscape rock by weight
• Square Footage CalculatorConstruction & Home · Area of rooms and lots
• Flooring CalculatorConstruction & Home · Square feet, boxes and cost for a room
• Linear Feet CalculatorConstruction & Home · Total length of boards, trim or fencing
• Acreage CalculatorConstruction & Home · Acres and hectares of a lot or field
• Rafter Length CalculatorConstruction & Home · Common rafter length from span and pitch
• Wall Studs CalculatorConstruction & Home · Studs and plates for a framed wall
• BMI CalculatorHealth & Fitness · Body mass index with health ranges
• Calorie CalculatorHealth & Fitness · Daily energy needs
• Body Fat CalculatorHealth & Fitness · Estimate body fat percentage
• FFMI CalculatorHealth & Fitness · Fat-free mass index from height and body fat
• Steps to Calories CalculatorHealth & Fitness · Calories burned walking from your steps
• Percentage CalculatorMath & Statistics · Percentage of, change & difference
• Fraction CalculatorMath & Statistics · Add, subtract and simplify
• Standard Deviation CalculatorMath & Statistics · Spread of a data set
• Binomial Distribution CalculatorMath & Statistics · Exact and cumulative probabilities
• Tip CalculatorEveryday & Auto · Tip and split the bill
• Macro CalculatorHealth & Fitness · Protein, carbs and fat in grams
• Breastfeeding Calories CalculatorHealth & Fitness · Daily calories while nursing
• Pace CalculatorHealth & Fitness · Running pace, time and distance
• Gas Mileage CalculatorEveryday & Auto · MPG and fuel cost
• Age CalculatorEveryday & Auto · Exact age in years, months and days