All calculators
Every CalcTen calculator, grouped by category. All tools support imperial and metric units.
Home & DIY
Concrete, paint, flooring, area and volume calculators for building and renovation projects.
Concrete Calculator
Cubic yards, m³ and premix bag counts for slabs, footings, post holes and steps.
Square Footage Calculator
Area of rooms and L-shapes in sq ft, m² and sq yd, with cut-outs and waste.
Paint Calculator
Gallons or litres of paint for walls and ceilings, with doors and windows subtracted.
Gravel Calculator
Cubic yards, tons, m³ and tonnes of gravel or crushed stone for any area.
Cubic Yard Calculator
Cubic yards, cubic feet and m³ for soil, mulch, fill and more.
Cubic Feet Calculator
Volume in ft³ with yd³, m³, litres and gallons.
Board Foot Calculator
Board feet, cubic metres and cost for lumber.
Stair Calculator
Risers, treads, run and stringer length, with code checks.
Tile Calculator
Tiles and boxes for floors and walls, with waste.
Flooring Calculator
Boxes of laminate, vinyl or hardwood for a room.
Drywall Calculator
Sheets of drywall or plasterboard for walls and ceilings.
Wallpaper Calculator
Drops and rolls of wallpaper, including pattern repeat.
Brick Calculator
Bricks per ft² or m² and the total for a wall.
Concrete Block Calculator
CMU, cinder or besser blocks for a wall.
Roofing Calculator
Roof area, squares, bundles and tiles from footprint and pitch.
Roof Pitch Calculator
Rise and run to x/12, degrees, percent and slope factor.
Decking Calculator
Deck boards, joists and screws for a deck.
Fence Calculator
Posts, panels, rails, pickets and post concrete.
Insulation Calculator
Layers and packs to reach a target R-value or RSI.
Voltage Drop Calculator
Volts and percent drop for AWG or mm² cable.
Grout Calculator
Grout volume, weight and bags, plus thinset.
Rebar Calculator
Bars, length, weight and ties for a slab grid.
Feet and Inches to mm Converter
Feet, inches and fractions to mm and back.
Dirt, Topsoil & Fill Dirt Calculator
Cubic yards, tons, bags and truckloads of dirt, topsoil or fill.
Sand Calculator
Cubic yards, tons and bags of sand for any area and depth.
Cubic Yards to Tons Calculator
Convert cubic yards to tons (and back) by material density.
Lumber Calculator
Board feet, pieces, studs, joists and cost for a lumber order.
Linear Feet Calculator
Add lengths, measure room trim and convert linear to square feet.
Epoxy Calculator
Gallons of epoxy for floor coatings and resin pours, with A:B split.
Mortar Calculator
Mortar volume, bags and site-mix quantities for brick, block and tile.
Sod Calculator
Square feet, slabs or rolls, and pallets of sod for a new lawn.
Asphalt Calculator
Tons of asphalt for a driveway, lot or road from area and thickness.
Inches to Decimal Converter
Fractional inches to decimal inches, decimal feet and mm, and back.
Paver Calculator
How many pavers, base stone and sand a patio or walkway needs.
Garden & Lawn
Mulch, compost, soil, grass seed, fertilizer, watering, ponds, pavers and more for garden and lawn projects.
Mulch Calculator
Cubic yards and bags of mulch for beds, borders and tree rings.
Compost Calculator
Cubic yards and bags of compost for lawns, beds and new planting areas.
Raised Bed Soil Calculator
Soil volume and blend amounts for raised garden beds.
Grass Seed Calculator
Pounds of grass seed for a new lawn or overseeding, by grass type.
Lawn Fertilizer Calculator
Pounds of fertilizer and bags needed for your lawn from the N rate and bag analysis.
Lawn Watering Calculator
Gallons per week and sprinkler run time for your lawn.
Pond Volume Calculator
Gallons or litres in a pond, with pump flow and liner size.
Plant Spacing Calculator
How many plants you need for a bed, border or hedge at a given spacing.
Lawn Area Calculator
Square feet and acres of an irregular lawn, with quick seed and fertilizer amounts.
Garden Path Calculator
Gravel, base stone, pavers and sand for a garden path or walkway.
Artificial Grass Calculator
Turf to order, seams, base rock and infill for an artificial lawn.
Rainwater Harvesting Calculator
Gallons or litres a roof collects from rain, and barrels needed.
Potting Soil Calculator
How much soil or potting mix fills a pot, planter or window box.
Firewood Cord Calculator
Cords, face cords and the real price per cord of a firewood stack.
Conversions
Length, area, volume, weight, temperature and speed converters with exact factors, tables and worked examples.
Centimetres to Inches Converter
Centimetres to inches (and back) with a table and exact formula.
Inches to mm Converter
Inches to millimetres and back, with nearest-fraction output.
Feet to Inches Converter
Feet to inches (and back) with yards, metres and a table.
Feet to Metres Converter
Feet to metres (and back), using the exact 0.3048 factor.
Kilometres to Miles Converter
Kilometres to miles and back, with race distances and a table.
CM to Feet and Inches Converter
Height in cm to feet and inches, with a height chart.
Metres to Yards Converter
Metres to yards and back, with sports distances.
Acres to Square Feet Converter
Acres to square feet, hectares and m², with a lot-size table.
Square Feet to Square Metres Converter
Square feet to square metres (and back), with room examples.
Gallons to Litres Converter
US and UK gallons to litres and back, with quarts and ounces.
ML to Ounces Converter
Millilitres to US or UK fluid ounces, with cups and litres.
Cubic Feet to Gallons Converter
Cubic feet to US gallons, litres, m³ and cubic yards.
Kilograms to Pounds Converter
Kilograms to pounds (and back), with ounces, grams and stone.
Grams to Ounces Converter
Grams to ounces (and back), with pounds and kilograms.
Tons to Pounds Converter
US, UK and metric tons to pounds and kilograms.
Stone to Pounds Converter
Stone to pounds and kg, or kg to stone and pounds.
Celsius to Fahrenheit Converter
Celsius to Fahrenheit (and back), with kelvin and a chart.
Km/h to MPH Converter
Km/h to mph and back, with m/s, knots and a speed-limit chart.
Knots to MPH Converter
Knots to mph, km/h and m/s, for boats, aircraft and wind.
PSI to Bar Converter
PSI to bar, kPa, atm and mmHg, with a tyre pressure chart.
Horsepower to Kilowatts Converter
Horsepower to kilowatts, watts and BTU/h, with metric PS.
Hours to Minutes Converter
Hours to minutes (and back), with decimal hours and h:mm:ss.
Degrees to Radians Converter
Degrees to radians (and back), with gradians, turns and π table.
Amps to Watts Calculator
Amps to watts (and watts to amps) for DC, AC and three-phase.
Unit Converter
One converter for length, area, volume, weight, temperature, speed and more.
Health & Fitness
BMI, calories, macros, protein, water, body fat, heart rate, pregnancy and fitness calculators based on CDC, NHS and WHO guidance.
BMI Calculator
BMI, category and healthy weight range for adults.
Calorie Calculator (BMR & TDEE)
BMR, TDEE and maintenance calories with the Mifflin-St Jeor equation.
Weight Loss Calculator (Calorie Deficit)
Daily calories, deficit and a realistic goal date for a weight goal.
Macro Calculator
Daily calories and grams of carbs, protein and fat for your goal.
Protein Calculator
Daily protein in grams from body weight and activity.
Water Intake Calculator
Daily water from drinks and food, plus workout replacement.
Body Fat Calculator (U.S. Navy Method)
Body fat % from height, neck, waist (and hip) using the Navy formula.
Ideal Weight Calculator
Four ideal-weight formulas beside the healthy BMI range.
Due Date Calculator
Estimated due date, weeks pregnant and key dates.
Pregnancy Weight Gain Calculator
Recommended total and weekly pregnancy weight gain.
Target Heart Rate Calculator
Max heart rate and exercise zones by age (Tanaka, 220−age, Karvonen).
Calories Burned Calculator
Calories burned for 45 activities from weight and minutes.
One-Rep Max (1RM) Calculator
Estimate your 1RM from weight and reps, with percentage table.
Running Pace Calculator
Pace, finish time or distance, with race predictions.
Sleep Calculator
Bedtimes and wake-up times from 90-minute sleep cycles.
Waist-to-Hip & Waist-to-Height Ratio Calculator
Waist-to-height and waist-to-hip ratios with NICE and WHO bands.
FFMI Calculator (Fat-Free Mass Index)
Fat-free mass, FFMI and normalised FFMI from body fat.
Steps to Miles Calculator
Convert steps to miles or km and back, using your height.
VO₂ Max Calculator
VO₂ max from the Cooper run, 1.5-mile run or Rockport walk.
Cooking & Kitchen
Cups to grams, ml and tablespoons, butter, oven temperatures, turkey times and safe cooking temperatures.
Cups to ml Converter
Cups to millilitres for US, metric and Australian cups.
Cups to Ounces Converter
Cups to US and imperial fluid ounces, with a chart.
Cups to Tablespoons Converter
Cups to tablespoons and teaspoons for US, metric and Australian spoons.
Tablespoons and Teaspoons to ml Converter
Tablespoons and teaspoons to ml for US, UK and Australian spoons.
Butter Converter – Sticks, Cups, Tablespoons & Grams
Butter in sticks, cups, tablespoons, grams, ounces and blocks.
Cups to Grams Calculator
Cups to grams for 55 ingredients, with King Arthur and USDA weights.
Grams to Cups Calculator
Grams or ounces to cups for flour, sugar, butter, milk and more.
Flour Cups to Grams Calculator
Cups to grams for 17 flours: wheat, nut, grain and gluten-free.
Sugar Cups to Grams Calculator
Cups to grams for 13 sugars, syrups and sweeteners.
Oven Temperature Converter – °F, °C and Gas Mark
Oven °F, °C and gas mark, with a fan oven setting and chart.
Turkey Cooking Time Calculator
Turkey roasting time at 325°F, start time and thawing, from USDA data.
Safe Cooking Temperature Calculator
USDA safe minimum internal temperatures with a thermometer check.
Date & Time
Age, days between dates, date maths, countdowns, business days, week numbers, hours and time card calculators.
Age Calculator
Exact age in years, months, days and hours, with next birthday.
Days Between Dates Calculator
Days, weeks, months and weekdays between two dates.
Date Calculator – Add or Subtract Days, Weeks, Months, Years
Add or subtract days, weeks, months and years from a date.
Days Until Calculator – Countdown to Any Date
Countdown in days, weeks and weekdays to holidays or any date.
Business Days Calculator – Working Days Between Dates
Working days between dates, or add working days, skipping weekends and holidays.
Week Number Calculator – What Week Is It?
ISO and US week number, weekday, day of the year and quarter for any date.
Time Calculator – Add or Subtract Hours, Minutes & Seconds
Add or subtract durations in days, hours, minutes and seconds.
Hours Calculator – Hours Between Two Times
Hours and minutes between two times, with a break and overnight shifts.
Time Card Calculator – Weekly Hours
Weekly timesheet total from daily in and out times, with breaks.
Time to Decimal Calculator – Hours and Minutes to Decimal Hours
Hours and minutes to decimal hours and back, with a minutes chart.
Automotive
MPG and L/100 km, fuel and EV charging costs, tyre sizes, gear ratios, horsepower and journey times.
MPG Calculator
Miles per gallon (US and UK), L/100 km and km/L from distance and fuel.
MPG to L/100 km Converter
US mpg, UK mpg, L/100 km and km/L, converted in one step.
Fuel Cost Calculator – Trip and Gas Cost
Trip fuel cost from distance, economy and price, with cost per person.
EV Charging Cost Calculator
Cost per charge, per mile, MPGe and saving versus petrol.
Tire Size Calculator – Compare Tyre Sizes and Speedometer Error
Compare two tyre sizes: diameter, sidewall, circumference and speedometer error.
Gear Ratio Calculator – Ratio and Engine RPM at Speed
Gear ratio from teeth, and engine RPM at speed from gears and tyre size.
Horsepower Calculator – Torque, RPM, kW and PS
Horsepower from torque and RPM, torque from hp, and hp ↔ kW ↔ PS.
Speed, Distance and Time Calculator – Average Speed
Average speed, distance or journey time, in mph, km/h, knots and pace.
Math & School
Percentages, fractions, averages, ratios, standard deviation, scientific notation, grades and GPA.
Percentage Calculator – What Is X% of Y?
X% of Y, X is what % of Y, and X is Y% of what number.
Percentage Change Calculator – Increase, Decrease and Reverse
Percent increase or decrease, add or subtract a percent, and find the original value.
Decimal to Fraction Calculator – Exact and Closest Fractions
Decimal to exact fraction, mixed number and nearest 1/16, 1/32 or 1/64.
Fraction to Decimal Calculator – With Repeating Decimals
Fraction or mixed number to decimal and percent, with repeating decimals.
Fraction Calculator – Add, Subtract, Multiply and Divide Fractions
Add, subtract, multiply and divide fractions and mixed numbers, simplified.
Average Calculator – Mean, Median, Mode and Range
Mean, median, mode, range and more for any list of numbers.
Ratio Calculator – Simplify, Solve and Split by Ratio
Simplify ratios, solve proportions and split a total by a ratio.
Standard Deviation Calculator – Sample and Population
Sample and population standard deviation, variance, mean and standard error.
Scientific Notation Converter – Numbers to a × 10ⁿ and Back
Numbers to scientific, E and engineering notation, and back to decimals.
Grade Calculator – Final Exam Score Needed and Weighted Grade
Final exam score needed for a target grade, and weighted course grade.
GPA Calculator – Term and Cumulative Grade Point Average
Term and cumulative GPA from letter grades and credits on the 4.0 scale.
Everyday Finance
Tips, discounts, simple and compound interest, loan payments and savings goals.
Tip Calculator – Tip, Total and Split the Bill
Tip, total and cost per person, with rounding and a quick percent table.
Discount Calculator – Sale Price, Percent Off and Savings
Sale price and savings from a percent off, discount % and original price.
Simple Interest Calculator – Interest and Total Amount
Interest and total from principal, rate and time, in years, months or days.
Compound Interest Calculator – With Monthly Deposits
Ending balance with monthly deposits, any compounding, and the effective annual rate.
Loan Payment Calculator – Monthly Payment, Interest and Payoff
Monthly payment, total interest and the effect of extra payments.
Savings Goal Calculator – Monthly Deposit and Time to Reach a Goal
Monthly deposit needed for a goal, or time to reach it, with interest.