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From feet to meters to your next birthday.
Simple calculators for the things you do every day.
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Showing 190 tools
Feet to Meter
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
Meter to Feet
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
Inch to CM
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
CM to Inch
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
MM to Inch
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
Inch to MM
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
Yard to Meter
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
Kilometre to Mile
Convert a length using your chosen input and output units, including feet, meters, inches, centimeters, millimeters and yards.
Square Feet to Square Meter
Convert ft² to m² instantly using a fixed conversion factor.
Square Meter to Square Feet
Convert m² to ft² instantly using a fixed conversion factor.
Acre to Square Feet
Convert acre to ft² instantly using a fixed conversion factor.
Hectare to Acre
Convert ha to acre instantly using a fixed conversion factor.
Gaj to Square Feet
Convert gaj to ft² instantly using a fixed conversion factor.
KG to Pounds
Convert kg to lb instantly using a fixed conversion factor.
Pounds to KG
Convert lb to kg instantly using a fixed conversion factor.
Gram to Ounce
Convert g to oz instantly using a fixed conversion factor.
Ton to KG
Convert metric tonnes to kg instantly using a fixed conversion factor.
ML to Liter
Convert mL to L instantly using a fixed conversion factor.
Cubic Feet to Liter
Convert ft³ to L instantly using a fixed conversion factor.
Mbps to MB/s
Convert Mbps to MB/s instantly using a fixed conversion factor.
Bigha to Square Feet
Calculate bigha to square feet with clear inputs, instant results and a step-by-step explanation.
Liter to Gallon
Calculate liter to gallon with clear inputs, instant results and a step-by-step explanation.
Gallon to Liter
Calculate gallon to liter with clear inputs, instant results and a step-by-step explanation.
Celsius to Fahrenheit
Calculate celsius to fahrenheit with clear inputs, instant results and a step-by-step explanation.
Fahrenheit to Celsius
Calculate fahrenheit to celsius with clear inputs, instant results and a step-by-step explanation.
Celsius to Kelvin
Calculate celsius to kelvin with clear inputs, instant results and a step-by-step explanation.
KB to MB
Calculate kb to mb with clear inputs, instant results and a step-by-step explanation.
MB to GB
Calculate mb to gb with clear inputs, instant results and a step-by-step explanation.
GB to TB
Calculate gb to tb with clear inputs, instant results and a step-by-step explanation.
Speed Converter
Calculate speed converter with clear inputs, instant results and a step-by-step explanation.
Pressure Converter
Calculate pressure converter with clear inputs, instant results and a step-by-step explanation.
Energy Converter
Calculate energy converter with clear inputs, instant results and a step-by-step explanation.
Power Converter
Calculate power converter with clear inputs, instant results and a step-by-step explanation.
Cooking Measurement Converter
Calculate cooking measurement converter with clear inputs, instant results and a step-by-step explanation.
Cooking Converter
Calculate cooking converter with clear inputs, instant results and a step-by-step explanation.
Fuel Economy Converter
Calculate fuel economy converter with clear inputs, instant results and a step-by-step explanation.
Age Calculator
Calculate age with clear inputs, instant results and a step-by-step explanation.
Birthday Calculator
Calculate birthday with clear inputs, instant results and a step-by-step explanation.
Date Difference Calculator
Calculate date difference with clear inputs, instant results and a step-by-step explanation.
Working Days Calculator
Calculate working days with clear inputs, instant results and a step-by-step explanation.
Add Days to Date
Calculate add days to date with clear inputs, instant results and a step-by-step explanation.
Subtract Days
Calculate subtract days with clear inputs, instant results and a step-by-step explanation.
Countdown Calculator
Calculate countdown with clear inputs, instant results and a step-by-step explanation.
Time Duration Calculator
Calculate time duration with clear inputs, instant results and a step-by-step explanation.
Discount Calculator
Calculate discount with clear inputs, instant results and a step-by-step explanation.
Sale Price Calculator
Calculate sale price with clear inputs, instant results and a step-by-step explanation.
Tip Calculator
Calculate tip with clear inputs, instant results and a step-by-step explanation.
Split Bill Calculator
Calculate split bill with clear inputs, instant results and a step-by-step explanation.
Price Per Unit Calculator
Calculate price per unit with clear inputs, instant results and a step-by-step explanation.
Cashback Calculator
Calculate cashback with clear inputs, instant results and a step-by-step explanation.
Fuel Cost Calculator
Calculate fuel cost with clear inputs, instant results and a step-by-step explanation.
Mileage Calculator
Calculate mileage with clear inputs, instant results and a step-by-step explanation.
Trip Cost Calculator
Calculate trip cost with clear inputs, instant results and a step-by-step explanation.
Distance Calculator
Calculate distance with clear inputs, instant results and a step-by-step explanation.
BMI Calculator
Calculate bmi with clear inputs, instant results and a step-by-step explanation.
BMR Calculator
Calculate bmr with clear inputs, instant results and a step-by-step explanation.
Calorie Calculator
Calculate calorie with clear inputs, instant results and a step-by-step explanation.
Ideal Weight Calculator
Calculate ideal weight with clear inputs, instant results and a step-by-step explanation.
Water Intake Calculator
Calculate water intake with clear inputs, instant results and a step-by-step explanation.
Body Fat Calculator
Calculate body fat with clear inputs, instant results and a step-by-step explanation.
Electricity Bill Calculator
Calculate electricity bill with clear inputs, instant results and a step-by-step explanation.
Appliance Electricity Calculator
Calculate appliance electricity with clear inputs, instant results and a step-by-step explanation.
AC Electricity Calculator
Calculate ac electricity with clear inputs, instant results and a step-by-step explanation.
Water Consumption Calculator
Calculate water consumption with clear inputs, instant results and a step-by-step explanation.
Recipe Serving Calculator
Calculate recipe serving with clear inputs, instant results and a step-by-step explanation.
TV Size Calculator
Calculate tv size with clear inputs, instant results and a step-by-step explanation.
Screen Size Calculator
Calculate screen size with clear inputs, instant results and a step-by-step explanation.
Battery Charging Time Calculator
Calculate battery charging time with clear inputs, instant results and a step-by-step explanation.
Internet Download Time Calculator
Calculate internet download time with clear inputs, instant results and a step-by-step explanation.
Data Usage Calculator
Calculate data usage with clear inputs, instant results and a step-by-step explanation.
Mobile Recharge Comparison Calculator
Calculate mobile recharge comparison with clear inputs, instant results and a step-by-step explanation.
Clothing Size Converter
Calculate clothing size converter with clear inputs, instant results and a step-by-step explanation.
Basic Calculator
Basic Calculator: Arithmetic expressions with parentheses, powers, sqrt, sin, cos, tan, log, ln and abs.
Scientific Calculator
Scientific Calculator: Arithmetic expressions with parentheses, powers, sqrt, sin, cos, tan, log, ln and abs.
Fraction Calculator
Fraction Calculator: Exact fraction arithmetic.
Percentage Calculator
Percentage Calculator: Percentage × value ÷ 100.
Percent Error Calculator
Percent Error Calculator: Absolute(measured − accepted) ÷ absolute(accepted) × 100.
Exponent Calculator
Exponent Calculator: Base raised to exponent.
Root Calculator
Root Calculator: Nth root of a value.
Log Calculator
Log Calculator: Logarithm of value with selected base.
Quadratic Formula Calculator
Quadratic Formula Calculator: Roots = (−b ± √(b² − 4ac)) ÷ 2a.
Ratio Calculator
Ratio Calculator: Reduce an integer ratio by the greatest common factor.
Least Common Multiple Calculator
Least Common Multiple Calculator: Find shared divisors using the Euclidean algorithm.
Greatest Common Factor Calculator
Greatest Common Factor Calculator: Find shared divisors using the Euclidean algorithm.
Common Factor Calculator
Common Factor Calculator: Find shared divisors using the Euclidean algorithm.
Factor Calculator
Factor Calculator: Factor a positive integer.
Prime Factorization Calculator
Prime Factorization Calculator: Factor a positive integer.
Rounding Calculator
Rounding Calculator: Round to the chosen number of decimal places.
Scientific Notation Calculator
Scientific Notation Calculator: Write a number as a coefficient times a power of ten.
Big Number Calculator
Big Number Calculator: Exact integer arithmetic with BigInt.
Long Division Calculator
Long Division Calculator: Integer quotient and remainder.
Number Sequence Calculator
Number Sequence Calculator: Generate arithmetic or geometric terms.
Random Number Generator
Random Number Generator: Uniform random integers using browser cryptography.
Dice Roller
Dice Roller: Roll independent uniform dice.
Triangle Calculator
Triangle Calculator: Heron area = √[s(s−a)(s−b)(s−c)].
Pythagorean Theorem Calculator
Pythagorean Theorem Calculator: Hypotenuse = √(a² + b²).
Right Triangle Calculator
Right Triangle Calculator: Hypotenuse = √(a² + b²).
Circle Calculator
Circle Calculator: Area = πr².
Slope Calculator
Slope Calculator: Slope = (y₂ − y₁) ÷ (x₂ − x₁).
Area Calculator
Area Calculator: Area of a rectangle, triangle or circle.
Volume Calculator
Volume Calculator: Calculate cuboid, cylinder or sphere measurements.
Surface Area Calculator
Surface Area Calculator: Calculate cuboid, cylinder or sphere measurements.
Standard Deviation Calculator
Standard Deviation Calculator: Mean, median, modes, range and standard deviation.
Statistics Calculator
Statistics Calculator: Mean, median, modes, range and standard deviation.
Mean, Median, Mode, Range Calculator
Mean, Median, Mode, Range Calculator: Mean, median, modes, range and standard deviation.
Average Calculator
Average Calculator: Mean, median, modes, range and standard deviation.
Z-score Calculator
Z-score Calculator: Z = (value − mean) ÷ standard deviation.
P-value Calculator
P-value Calculator: Standard normal tail probability from a Z statistic.
Confidence Interval Calculator
Confidence Interval Calculator: Z confidence interval = mean ± z × σ ÷ √n.
Sample Size Calculator
Sample Size Calculator: n = z² × p(1−p) ÷ margin².
Probability Calculator
Probability Calculator: Independent events: intersection = P(A)P(B).
Permutation and Combination Calculator
Permutation and Combination Calculator: nPr = n!/(n−r)!.
Matrix Calculator
Matrix Calculator: Matrix operations for rectangular matrices up to 8 × 8.
Half-Life Calculator
Half-Life Calculator: Remaining = initial × 0.5^(elapsed ÷ half-life).
Density Calculator
Density Calculator: Density = mass ÷ volume.
Mass Calculator
Mass Calculator: Mass = density × volume.
Weight Calculator
Weight Calculator: Weight force = mass × gravitational acceleration.
Speed Calculator
Speed Calculator: Speed = distance ÷ time.
Molarity Calculator
Molarity Calculator: Molarity = solute mass ÷ molar mass ÷ solution liters.
Ohms Law Calculator
Ohms Law Calculator: Voltage = current × resistance.
Horsepower Calculator
Horsepower Calculator: Mechanical hp = torque (N·m) × RPM ÷ 7120.909.
Engine Horsepower Calculator
Engine Horsepower Calculator: Quarter-mile estimate hp = weight (lb) ÷ (elapsed / 5.825)^3.
Molecular Weight Calculator
Molecular Weight Calculator: Sum standard atomic weights multiplied by atom counts.
Voltage Drop Calculator
Voltage Drop Calculator: Single-phase/DC round-trip voltage drop = 2 × length × current × resistivity ÷ area.
Resistor Calculator
Resistor Calculator: Series: sum R.
GDP Calculator
GDP Calculator: GDP = consumption + investment + government + exports − imports.
Concrete Calculator
Concrete Calculator: Material volume = length × width × depth × (1 + waste percentage).
Gravel Calculator
Gravel Calculator: Material volume = length × width × depth × (1 + waste percentage).
Mulch Calculator
Mulch Calculator: Material volume = length × width × depth × (1 + waste percentage).
Square Footage Calculator
Square Footage Calculator: Rectangular area = length × width.
Roofing Calculator
Roofing Calculator: Sloped area = footprint × √(1 + (pitch/12)²) × waste factor.
Tile Calculator
Tile Calculator: Tile count = ceiling(area ÷ tile area × waste factor).
Stair Calculator
Stair Calculator: Riser count = ceiling(total rise ÷ target riser).
BTU Calculator
BTU Calculator: Preliminary cooling load = area × user-selected allowance.
Tire Size Calculator
Tire Size Calculator: Diameter = rim × 25.4 + 2 × width × aspect ratio ÷ 100.
Binary Calculator
Binary Calculator: Exact base 2 integer arithmetic.
Hex Calculator
Hex Calculator: Exact base 16 integer arithmetic.
IP Subnet Calculator
IP Subnet Calculator: IPv4 network, mask, broadcast and conventional usable host range.
Password Generator
Password Generator: Cryptographically random password generated locally.
Base64 Encode / Decode
Base64 Encode / Decode: UTF-8 Base64 conversion.
URL Encode / Decode
URL Encode / Decode: Encode or decode a URL component.
Bandwidth Calculator
Bandwidth Calculator: Bandwidth = gigabytes × 8000 ÷ seconds.
Roman Numeral Converter
Roman Numeral Converter: Convert between canonical Roman numerals and integers 1–3999.
Conversion Calculator
Conversion Calculator: Convert between length units.
Date Calculator
Calculate add days to date with clear inputs, instant results and a step-by-step explanation.
Day Counter
Calculate date difference with clear inputs, instant results and a step-by-step explanation.
Time Calculator
Calculate time duration with clear inputs, instant results and a step-by-step explanation.
Hours Calculator
Calculate time duration with clear inputs, instant results and a step-by-step explanation.
Time Zone Calculator
Calculate time zone converter with clear inputs, instant results and a step-by-step explanation.
Day of the Week Calculator
Day of the Week Calculator: Find the weekday for a calendar date.
Time Card Calculator
Time Card Calculator: Paid time = shift duration − unpaid break.
GPA Calculator
GPA Calculator: GPA = sum(grade points × credits) ÷ total credits.
Grade Calculator
Grade Calculator: Weighted grade = sum(score × weight) ÷ sum(weights).
Height Calculator
Height Calculator: Convert centimeters to feet and inches.
Bra Size Calculator
Bra Size Calculator: Approximate US/UK band and cup from measurements.
Love Calculator
Love Calculator: A playful name-based score for entertainment.
Sleep Calculator
Sleep Calculator: Suggested bedtime = wake-up time − 90 minutes per cycle − sleep latency.
Golf Handicap Calculator
Golf Handicap Calculator: Baseline index = average of lowest 8 of 20 differentials.
Wind Chill Calculator
Wind Chill Calculator: Wind chill = 13.12 + 0.6215T − 11.37V^0.16 + 0.3965TV^0.16.
Dew Point Calculator
Dew Point Calculator: Magnus approximation with constants 17.625 and 243.04°C.
Heat Index Calculator
Heat Index Calculator: Rothfusz regression (warm, humid conditions).
Gas Mileage Calculator
Calculate mileage with clear inputs, instant results and a step-by-step explanation.
Electricity Calculator
Calculate appliance electricity with clear inputs, instant results and a step-by-step explanation.
Shoe Size Conversion
Calculate shoe size converter with clear inputs, instant results and a step-by-step explanation.
TDEE Calculator
Calculate calorie with clear inputs, instant results and a step-by-step explanation.
Healthy Weight Calculator
Calculate ideal weight with clear inputs, instant results and a step-by-step explanation.
Overweight Calculator
Calculate bmi with clear inputs, instant results and a step-by-step explanation.
Anorexic BMI Calculator
Anorexic BMI Calculator: Adult BMI = kg ÷ height in meters squared.
Carbohydrate Calculator
Carbohydrate Calculator: Adult reference intake = 45–65% of energy ÷ 4 kcal per gram.
Fat Intake Calculator
Fat Intake Calculator: Adult reference intake = 20–35% of energy ÷ 9 kcal per gram.
Protein Calculator
Protein Calculator: Protein = weight × selected grams per kilogram.
Macro Calculator
Macro Calculator: Protein and carbohydrate provide 4 kcal/g.
Lean Body Mass Calculator
Lean Body Mass Calculator: Lean mass = weight × (1 − body fat fraction).
Body Surface Area Calculator
Body Surface Area Calculator: Mosteller BSA = √(height × weight ÷ 3600).
Body Type Calculator
Body Type Calculator: Describe relative shoulder, waist and hip proportions.
Calories Burned Calculator
Calories Burned Calculator: Calories ≈ MET × 3.5 × weight ÷ 200 × minutes.
One Rep Max Calculator
One Rep Max Calculator: Epley estimate = weight × (1 + repetitions ÷ 30).
Target Heart Rate Calculator
Target Heart Rate Calculator: Karvonen target = resting + (220 − age − resting) × intensity.
Pace Calculator
Pace Calculator: Pace = elapsed minutes ÷ distance.
Army Body Fat Calculator
Army Body Fat Calculator: 2023 US Army single-site estimate: male −26.97 − 0.12W + 1.99A.
GFR Calculator
GFR Calculator: 2021 race-free CKD-EPI creatinine eGFR equation.
BAC Calculator
BAC Calculator: Widmark estimate: grams ÷ (kg × 1000 × factor) × 100 − 0.015 × hours.
Weight Watcher Points Calculator
Weight Watcher Points Calculator: Historical points estimate = calories/50 + fat/12 − min(fiber,4)/5.
Pregnancy Calculator
Pregnancy Calculator: Calendar estimate assuming ovulation about 14 days before the next period.
Due Date Calculator
Due Date Calculator: Calendar estimate assuming ovulation about 14 days before the next period.
Pregnancy Conception Calculator
Pregnancy Conception Calculator: Calendar estimate assuming ovulation about 14 days before the next period.
Conception Calculator
Conception Calculator: Calendar estimate assuming ovulation about 14 days before the next period.
Ovulation Calculator
Ovulation Calculator: Calendar estimate assuming ovulation about 14 days before the next period.
Period Calculator
Period Calculator: Calendar estimate assuming ovulation about 14 days before the next period.
Pregnancy Weight Gain Calculator
Pregnancy Weight Gain Calculator: Singleton pregnancy total gain range based on pre-pregnancy adult BMI.
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