Calcora / working numbers / 196 tools
What do you need to work out?
Find the calculator, enter what you know, and get a number you can use. Nothing is sent off your device.
- 196
- calculators indexed
- Local
- math stays on device
- $0
- account not required
Browse the index
Useful now
Today's quick pick
Home & ConstructionFlooring Calculator
Square footage, waste factor, and boxes of flooring to buy.
Most used
Concrete Calculator
Cubic yards and 60/80 lb bag counts for slabs, footings, and posts.
Mortgage Calculator
Estimate your monthly mortgage payment and total interest.
BMI Calculator
Body Mass Index from your height and weight.
Percentage Calculator
What is X percent of a number.
Paint Calculator
Gallons of paint a room needs by size, coats, doors and windows.
Tip Calculator
Tip amount and total, split across any number of people.
Length Converter
Convert between meters, feet, inches, miles, and more.
Fuel Cost Calculator
The fuel cost of a trip from distance, MPG, and gas price.
All calculators
Home & Construction
42 entriesConcrete Calculator
Cubic yards and 60/80 lb bag counts for slabs, footings, and posts.
Paint Calculator
Gallons of paint a room needs by size, coats, doors and windows.
Flooring Calculator
Square footage, waste factor, and boxes of flooring to buy.
Mulch Calculator
Cubic yards of mulch and the number of 2 cu ft bags for any bed.
Gravel & Driveway Calculator
Cubic yards and tons of gravel for a driveway, path, or base.
Drywall Sheet Calculator
How many 4×8 drywall sheets a room needs, walls plus ceiling.
Tile Calculator
How many tiles and boxes you need for a floor or wall.
Roofing Squares Calculator
Roofing squares and shingle bundles from footprint and pitch.
Deck Board Calculator
How many deck boards and rows you need for a deck of any size.
Fence Calculator
Posts, rails, and pickets for a fence run of any length.
Sod Calculator
Square yards, pallets, and rolls of sod for a lawn area.
Grass Seed Calculator
Pounds of grass seed for a new lawn or overseeding.
BTU / AC Sizing Calculator
BTUs of cooling a room needs to size an AC unit.
Insulation / R-Value Calculator
Batt or roll square footage and the R-value you need.
Stair Calculator
Number of steps, rise, and run for a staircase to a given height.
Brick Calculator
How many bricks a wall needs, including mortar joints.
Plywood / Sheet Goods Calculator
How many 4x8 sheets of plywood or OSB an area needs.
Wallpaper Calculator
Rolls of wallpaper a room needs by wall size and roll coverage.
Baseboard & Trim Calculator
Linear feet of baseboard or trim for a room, with waste.
Excavation / Dirt Calculator
Cubic yards and truckloads of dirt to excavate or fill.
Asphalt Calculator
Tons of asphalt for a driveway or lot at a given thickness.
French Drain Gravel Calculator
Cubic yards and tons of gravel to fill a French drain trench.
Square Footage Calculator
Square footage of a room and its cost at a price per square foot.
Board Foot Calculator
Board feet of lumber from thickness, width, and length.
Wall Framing Calculator
Studs and plate lumber for framing a wall at 16 or 24 inch spacing.
Retaining Wall Calculator
Wall blocks, courses, and cap blocks for a segmental retaining wall.
Topsoil Calculator
Cubic yards, tons, and bags of topsoil for beds, lawns, and fill.
Siding Calculator
Squares and boxes of vinyl siding from your home's wall area.
Paver Calculator
Pavers and gravel base for a patio or walkway of any size.
Sand Calculator
Cubic yards, tons, and bags of sand for bedding, boxes, and fill.
Rebar Calculator
Rebar pieces and linear feet for a slab grid at your spacing.
Carpet Calculator
Square yards of carpet for a room, with waste for seams and trim.
Deck Stain Calculator
Gallons of stain or sealer for a deck, by coats and coverage.
Concrete Block Calculator
CMU blocks and mortar bags for a block wall of any size.
Stair Stringer Calculator
Stringer count and board length for a set of deck or porch stairs.
Gutter Calculator
Gutter sections, downspouts, and hangers for your roofline.
Baluster Calculator
Balusters for a railing run with the code-max 4 inch gap.
Pool Volume Calculator
Gallons in a rectangular or round pool from its dimensions.
Firewood Calculator
Cords of firewood in a stack — check you got what you paid for.
Driveway Sealer Calculator
Pails of asphalt sealer for a driveway, by coats and coverage.
Fertilizer Calculator
Pounds of fertilizer product from your lawn size and nitrogen rate.
Dumpster Size Calculator
The dumpster size to rent from your debris pile's dimensions.
Finance
37 entriesTip with Tax Calculator
Tip on the pre-tax bill, then total it with sales tax.
Salary to Hourly Calculator
Convert an annual salary into an equivalent hourly wage.
Simple Interest Calculator
Interest and total on a principal at a flat (non-compounding) rate.
Rule of 72 Calculator
Estimate how many years it takes an investment to double.
Mortgage Calculator
Estimate your monthly mortgage payment and total interest.
Auto Loan Calculator
Monthly car payment from price, down payment, rate, and term.
Compound Interest Calculator
See what a lump sum grows to with compound interest.
Savings Calculator
Future value of a regular monthly deposit.
Tip Calculator
Tip amount and total, split across any number of people.
Sales Tax Calculator
Add sales tax to a price and see the total.
Mortgage Refinance Calculator
Monthly savings and break-even point of refinancing your mortgage.
Loan Payoff (Extra Payment) Calculator
How much faster you pay off a loan with extra monthly payments.
Credit Card Payoff Calculator
Months to clear a credit card balance at a fixed monthly payment.
Debt Snowball Calculator
Months to pay off your smallest debt first with the snowball method.
Rent vs Buy Calculator
Compare monthly renting against the cost of owning a home.
Down Payment Calculator
Your down payment and loan amount from price and percent down.
ROI Calculator
Return on investment from what you put in and got back.
CAGR Calculator
Compound annual growth rate between a start and end value.
Retirement (4% Rule) Calculator
The nest egg you need to retire on a target yearly spend.
Net Worth Calculator
Your net worth from total assets minus total liabilities.
Take-Home Paycheck Calculator
Estimated take-home pay after a simplified tax rate.
Hourly to Salary Calculator
Convert an hourly wage to an annual salary and back.
Overtime Pay Calculator
Total pay for a week including time-and-a-half overtime.
APR Calculator
Effective APR on a loan once upfront fees are included.
Break-Even Calculator
Units you must sell to cover fixed and variable costs.
Loan Payment Calculator
Monthly payment, total interest, and total cost for any fixed loan.
Future Value Calculator
Grow a starting balance plus regular monthly contributions over time.
CD Calculator
Maturity value and interest earned on a certificate of deposit.
Debt-to-Income Calculator
Your DTI ratio — what lenders use to size your mortgage approval.
Inflation Calculator
What a sum of money will be worth after years of inflation.
Pay Raise Calculator
New salary and the dollar amount of a percentage raise.
Emergency Fund Calculator
How big your safety net should be and how long until you reach it.
FIRE Number Calculator
The nest egg you need to retire on the 4% safe-withdrawal rule.
401(k) Calculator
Your 401(k) balance at retirement, with employer match included.
Property Tax Calculator
Annual and monthly property tax from your home value and local rate.
Closing Cost Calculator
Closing costs and total cash to close on a home purchase.
Cap Rate Calculator
Capitalization rate and cash flow for a rental property.
Health & Fitness
21 entriesCalorie Deficit Calculator
How long a daily calorie deficit takes to hit a weight-loss goal.
Lean Body Mass Calculator
Estimate lean body mass and body-fat weight (Boer formula).
BMI Calculator
Body Mass Index from your height and weight.
BMR / Calorie Calculator
Daily calories burned at rest (Mifflin-St Jeor).
Body Fat Calculator
Estimate body-fat percentage (U.S. Navy method).
Ideal Weight Calculator
A healthy target weight for your height (Devine formula).
Water Intake Calculator
How much water to drink per day by weight and activity.
Calories Burned Calculator
Calories burned for an activity by weight and duration.
TDEE / Macro Calculator
Daily calories and a protein/carb/fat split for your goal.
Protein Intake Calculator
Daily protein target by body weight and training goal.
One-Rep Max Calculator
Estimate your 1-rep max from a weight and reps performed.
Running Pace Calculator
Your pace per mile and per kilometer from time and distance.
Heart Rate Zone Calculator
Your max heart rate and training zones by age.
Pregnancy Due Date Calculator
Estimated due date from your last menstrual period (Naegele).
Ovulation Calculator
Your estimated ovulation day and fertile window.
Blood Alcohol (BAC) Calculator
Estimated blood alcohol content from drinks, weight, and time.
Macro Calculator
Split your daily calories into protein, carbs, and fat grams.
Waist-to-Hip Ratio Calculator
A quick body-shape health marker from two tape measurements.
Smoking Cost Calculator
What a cigarette habit costs you per day, year, and decade.
Blood Pressure Category Calculator
Classify a reading using the standard AHA blood-pressure stages.
Daily Habit Savings Calculator
Turn a daily spend (coffee, snack, soda) into yearly and 5-year totals.
Math
28 entriesPercentage Calculator
What is X percent of a number.
Percent Change Calculator
The percentage increase or decrease between two numbers.
Average (Mean) Calculator
The mean, sum, and count of a list of numbers.
Ratio Calculator
Simplify a ratio to its lowest terms.
Exponent Calculator
Raise a number to any power.
Square Root Calculator
The square root and cube root of a number.
Logarithm Calculator
Log of a number in any base, plus natural log.
GCD & LCM Calculator
Greatest common divisor and least common multiple of two numbers.
Triangle Area Calculator
Area of a triangle from its base and height.
Circle Area Calculator
Area and circumference of a circle from its radius.
Cylinder Volume Calculator
Volume of a cylinder from its radius and height.
Sphere Volume Calculator
Volume and surface area of a sphere from its radius.
Box Volume Calculator
Volume of a rectangular box from length, width, and height.
Pythagorean Theorem Calculator
The hypotenuse of a right triangle from its two legs.
Slope Calculator
The slope of a line between two points.
Quadratic Equation Calculator
Real roots of ax^2 + bx + c = 0.
Permutation & Combination Calculator
Permutations (nPr) and combinations (nCr) of n items taken r.
Factorial Calculator
The factorial (n!) of a whole number.
Standard Deviation Calculator
Mean, variance, and standard deviation of a list of numbers.
Fraction Calculator
Add two fractions and simplify the result.
Scientific Notation Converter
Convert a number to and from scientific notation.
Rounding Calculator
Round a number to a chosen number of decimal places.
Midpoint Calculator
The midpoint of a line segment between two (x, y) points.
Distance Between Points Calculator
Straight-line distance between two points using the distance formula.
Percent of Total Calculator
What percent one number is of another — and the difference.
Mean Median Mode Calculator
Mean, median, mode, and range from a list of numbers.
Trapezoid Area Calculator
Area of a trapezoid from its two parallel sides and height.
Modulo Calculator
The remainder and quotient when dividing one integer by another.
Conversions
20 entriesLength Converter
Convert between meters, feet, inches, miles, and more.
Weight Converter
Convert kilograms, pounds, ounces, grams, and stone.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin.
Volume Converter
Convert liters, gallons, cups, milliliters, and more.
Speed Converter
Convert mph, km/h, m/s, and knots.
Area Converter
Convert square feet, square meters, acres, hectares, and more.
Data Storage Converter
Convert bytes, kilobytes, megabytes, gigabytes, and terabytes.
Energy Converter
Convert joules, calories, kilowatt-hours, and BTU.
Power Converter
Convert watts, kilowatts, horsepower, and BTU per hour.
Pressure Converter
Convert PSI, bar, kPa, atmospheres, and mmHg.
Time Converter
Convert seconds, minutes, hours, days, and weeks.
Angle Converter
Convert degrees, radians, gradians, and turns.
Frequency Converter
Convert hertz, kilohertz, megahertz, and gigahertz.
Fuel Economy Converter
Convert between MPG (US) and liters per 100 km.
Shoe Size Converter
Convert US, UK, and EU shoe sizes for men.
Force Converter
Convert newtons, pound-force, kilogram-force, and dynes.
Cooking Volume Converter
Convert between cups, tablespoons, teaspoons, ounces, and milliliters.
Torque Converter
Convert torque between newton-meters, foot-pounds, and inch-pounds.
Flow Rate Converter
Convert volumetric flow between L/min, GPM, m³/h, and L/s.
Density Converter
Convert density between kg/m³, g/cm³, and lb/ft³.
Everyday
18 entriesUnit Price Calculator
Cost per unit so you can compare which package is the better deal.
Dog Age Calculator
Convert a dog's age into human-equivalent years.
Age Calculator
Your exact age in years, months, and days.
Date Difference Calculator
The number of days between two dates.
Fuel Cost Calculator
The fuel cost of a trip from distance, MPG, and gas price.
Discount Calculator
The sale price and savings after a percent-off discount.
GPA Calculator
Your grade point average from letter grades and credit hours.
Sleep Cycle Calculator
Bedtimes that let you wake at the end of a sleep cycle.
Electricity Cost Calculator
What an appliance costs to run per day, month, and year.
Generator Wattage Calculator
Generator size you need from your running and starting loads.
Water Bill Calculator
Estimated water cost from daily usage and your rate.
Roman Numeral Converter
Convert a number (1-3999) to Roman numerals.
Password Strength Calculator
Estimate a password's entropy and crack time.
Random Number / Dice Roller
Roll dice or generate a random number in a range.
Reading Time Calculator
How long a piece of text takes to read at your pace.
Coin Flip Probability Calculator
Odds of getting at least one heads across a number of fair coin flips.
Tank Volume Calculator
Gallons in a rectangular or cylindrical tank from inside dimensions.
Download Time Calculator
How long a file takes to download at your connection speed.
Auto
8 entriesGas Savings Calculator
Yearly fuel savings from switching to a more efficient car.
Lease vs Buy (Car) Calculator
Compare leasing a car against financing the same vehicle.
MPG Calculator
Your real gas mileage from miles driven and gallons used.
Tire Size Calculator
Overall diameter and circumference of a tire from its size code.
0-60 mph Estimator
Rough 0-60 mph time from horsepower and vehicle weight.
Towing Payload Calculator
Remaining payload after passengers, cargo, and tongue weight.
Road Trip Cost Calculator
Total fuel cost of a road trip, split between travelers.
Car Depreciation Calculator
What a car will be worth after years of typical depreciation.
Cooking & Kitchen
7 entriesRecipe Scaler
Scale an ingredient amount up or down for new servings.
Baking Conversion Calculator
Convert cups of a common baking ingredient to grams.
Oven Temperature Converter
Convert oven temperatures between Fahrenheit, Celsius, and gas mark.
Roast Cooking Time Calculator
Roasting time for meat by weight and doneness.
Pizza Dough Calculator
Flour, water, salt, and yeast for a batch of pizza dough.
Coffee Ratio Calculator
Grams of coffee and water for your brew ratio.
Turkey Thaw & Cook Calculator
Fridge thaw time and roast time for a whole turkey.
Business & Tax
8 entriesMargin vs Markup Calculator
Profit margin and markup from cost and selling price.
Profit Margin Calculator
Gross profit and margin from revenue and costs.
Stacked Discount Calculator
The real price after two discounts applied one after another.
VAT Calculator
Add or remove VAT from a price.
Freelance Hourly Rate Calculator
The hourly rate you need to hit an income target.
Invoice Total Calculator
Invoice total from hours, rate, tax, and a discount.
Freelancer Take-Home Calculator
Estimated take-home after self-employment tax and income tax.
Stock Cost Basis Calculator
Average share price and total cost across multiple buys.
Time & Date
7 entriesAdd or Subtract Days Calculator
The date a number of days before or after a start date.
Business Days Calculator
Count the weekdays (Mon-Fri) between two dates.
Time Duration Calculator
Hours and minutes between a start and end time.
Time Zone Offset Calculator
Convert a time from one UTC offset to another.
Week Number Calculator
The ISO week number for any date.
Countdown to Date Calculator
Days, weeks, and months until a future date.
Hours Worked Calculator
Daily hours worked and gross pay from clock-in and clock-out.