Speed Calculator - Calculate Speed, Distance, and Time Online | AnyCalOnline
Page Title: Speed Calculator - Calculate Speed, Distance, and Time Online | AnyCalOnline
Meta Description: Use our free Speed Calculator to easily calculate speed, distance, or time. Supports multiple units including mph, km/h, meters, miles, seconds, and hours.
Welcome to the online Speed Calculator. Use this tool to compute speed, distance, or duration using standard kinematic formulas with real-time audio feedback and multiple unit selectors.
Speed . Distance . Time Calculator
Result Speed
50.00 km/h (31.07 mph)
About the Speed Calculator
In physics and everyday travel, motion is governed by three core variables: speed ($s$), distance ($d$), and time ($t$). Knowing any two of these values allows you to determine the third using fundamental algebraic formulas.
This online calculator eliminates manual unit conversion friction by letting you mix and match metrics such as miles per hour (mph), kilometers per hour (km/h), meters, and hours seamlessly.
Kinematic Formulas Reference
The calculations performed by this tool rely on the foundational formulas of linear motion:
Speed Formula: Speed is equal to distance divided by time.
$$Speed = \frac{Distance}{Time}$$
Distance Formula: Distance is equal to speed multiplied by time.
$$Distance = Speed \times Time$$
Time Formula: Time is equal to distance divided by speed.
$$Time = \frac{Distance}{Speed}$$
Reference: Common Speed Conversions
Miles Per Hour (mph)
Kilometers Per Hour (km/h)
Meters Per Second (m/s)
1 mph
1.609 km/h
0.447 m/s
30 mph
48.28 km/h
13.41 m/s
60 mph
96.56 km/h
26.82 m/s
100 mph
160.93 km/h
44.70 m/s
Frequently Asked Questions (FAQ)
1. How do I calculate speed if I have miles and hours?
Simply enter your total distance in miles and the duration in hours into the speed mode, and the calculator will output your speed in miles per hour (mph).
2. Can I use meters and seconds?
Yes, the unit dropdown selections allow you to choose meters for distance and seconds for time to calculate speed in meters per second (m/s).
3. What is the difference between speed and velocity?
Speed is a scalar quantity indicating how fast an object is moving, whereas velocity is a vector quantity that includes both speed and direction.
Use these free fraction calculators to add, subtract, multiply, and divide fractions and mixed numbers, simplify fractions to their lowest terms, and convert between fractions and decimals - including a version built for very large numbers. No sign-up required.
Fraction Calculator
Add, subtract, multiply, or divide two fractions.
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Mixed number:-
Decimal:-
Mixed Numbers Calculator
Add, subtract, multiply, or divide mixed numbers, e.g. -2 3/4.
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Mixed number:-
Decimal:-
Simplify Fractions Calculator
Reduce a fraction to its lowest terms.
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Decimal:-
Decimal to Fraction Calculator
Convert a decimal number into a simplified fraction.
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Mixed number:-
Fraction to Decimal Calculator
Convert a fraction into its decimal equivalent.
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Big Number Fraction Calculator
For fractions with very large integer numerators or denominators.
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Numerator:-
Denominator:-
All calculators here work with the fraction already reduced to its simplest form in the result. For everyday use, the first five calculators are plenty - the Big Number calculator only matters if your numerator or denominator has more digits than a normal calculator can handle accurately (typically more than 15-16 digits).
What is a fraction and how these calculators work
A fraction represents part of a whole, written as a numerator (the top number) over a denominator (the bottom number). If you split a pizza into 8 equal slices and eat 3 of them, you've eaten 3/8 of the pizza - 3 is the numerator, 8 is the denominator. A fraction's denominator can never be zero, since dividing by zero is undefined.
These calculators handle the standard operations performed on fractions - addition, subtraction, multiplication, division, simplification, and conversion to and from decimals - and automatically reduce every result to its simplest form.
Addition and subtraction
Adding or subtracting fractions requires a common denominator first, since you can only combine parts that are measured in the same-sized pieces. The standard approach multiplies each fraction's numerator and denominator by the other fraction's denominator, giving both fractions the same denominator before combining the numerators.
Multiplying fractions is more direct - no common denominator is needed. Multiply the numerators together, multiply the denominators together, then simplify the result.
Example: 3/4 × 1/6 = 3/24 = 1/8
Division
Dividing by a fraction is the same as multiplying by its reciprocal (flip the numerator and denominator of the fraction you're dividing by, then multiply).
Example: 3/4 ÷ 1/6 = 3/4 × 6/1 = 18/4 = 9/2
Simplifying fractions
A fraction is in its simplest form when the numerator and denominator share no common factor other than 1. To simplify, divide both the numerator and denominator by their greatest common factor (GCF).
Example: 21/98 → greatest common factor is 7 → 21÷7 = 3, 98÷7 = 14 → simplified to 3/14
Converting between fractions and decimals
To convert a decimal to a fraction, use each digit after the decimal point as part of a fraction over a power of 10, then simplify. To convert a fraction to a decimal, simply divide the numerator by the denominator - some fractions convert to a terminating decimal, while others repeat indefinitely.
How do I add or subtract fractions with different denominators?
How do I simplify a fraction to its lowest terms?
How do I convert a decimal to a fraction?
How do I convert a fraction to a decimal?
How do I add or subtract mixed numbers?
How do I work with fractions that have very large numbers?
How to use these calculators
Fraction Calculator: enter both fractions' numerators and denominators, choose an operation, and click Calculate.
Mixed Numbers Calculator: enter two mixed numbers (e.g. "-2 3/4"), choose an operation, and click Calculate.
Simplify Fractions Calculator: enter a numerator and denominator and click Calculate to reduce it to lowest terms.
Decimal to Fraction Calculator: enter a decimal number and click Calculate to see it as a simplified fraction.
Fraction to Decimal Calculator: enter a numerator and denominator and click Calculate to see the decimal value.
Big Number Fraction Calculator: enter very large whole-number numerators and denominators as text and click Calculate for an exact result.
Tips
Every result is automatically reduced to its simplest form - if you were expecting an unsimplified answer for homework, remember to check your teacher's requirements on showing intermediate steps.
For repeating decimals, the Fraction to Decimal calculator shows a rounded value rather than the infinite repeating digits - the repeating pattern itself is noted where relevant.
Negative mixed numbers should have the minus sign before the whole number, like "-2 3/4", which applies to the whole value.
Use the Big Number calculator only when your numbers exceed about 15 digits - for anything smaller, the regular Fraction Calculator is simpler and works identically.
Frequently asked questions
Are these fraction calculators free to use?
Yes. They are completely free, work in your browser, and do not require any sign-up or download.
Why is my answer shown as a fraction instead of a decimal?
Fractions are kept in exact fraction form because converting to a decimal can lose precision for repeating decimals. Each result also shows the decimal equivalent alongside the fraction so you have both.
What does it mean to simplify a fraction?
Simplifying means reducing a fraction so the numerator and denominator have no common factor left other than 1, which makes the fraction easier to read and work with without changing its value.
Can I enter negative fractions?
Yes. Enter a negative sign on the numerator for a basic fraction, or before the whole number for a mixed number (e.g. "-2 3/4").
When would I need the Big Number Fraction Calculator?
Regular calculators, including this one's standard fraction calculator, lose precision on whole numbers larger than about 15-16 digits due to how computers store numbers. The Big Number calculator is built specifically to handle those very large numerators and denominators exactly.
Related searches
fraction calculatormixed number calculatorsimplify fractions calculatordecimal to fraction calculatorfraction to decimal calculatoradding fractions calculatorbig number fraction calculator
Use this free converter to turn a fraction into a decimal, or a decimal into a simplified
fraction, instantly — supports mixed numbers, negative values, and repeating decimals. No
sign-up required.
Fraction → Decimal
Decimal → Fraction
Decimal value
0
As a fraction—
As a percentage—
Simplified fraction
0/1
Mixed number—
As a percentage—
Common fractions to decimals chart
Fraction
Decimal
Fraction
Decimal
1/2
0.5
1/8
0.125
1/3
0.333...
3/8
0.375
2/3
0.667...
5/8
0.625
1/4
0.25
7/8
0.875
3/4
0.75
1/16
0.0625
1/5
0.2
1/10
0.1
2/5
0.4
1/6
0.1667...
3/5
0.6
5/6
0.8333...
4/5
0.8
1/9
0.111...
What is a fraction-to-decimal converter and why it matters
Fractions and decimals represent the exact same values, but each format is easier to work
with in different situations — fractions are natural for cooking measurements and
construction, while decimals are what calculators, spreadsheets, and most math problems
expect. Converting between the two by hand means dividing (or finding a common denominator
and simplifying), which is easy to get wrong under time pressure. This tool does both
directions instantly: turn a fraction into its decimal equivalent, or turn a decimal into
its simplest fraction form, including proper handling of mixed numbers and repeating
decimals like 1/3 = 0.333...
How this tool works
For fraction to decimal, the calculator divides the numerator by the denominator and adds
any whole number you enter, then also shows the equivalent percentage. For decimal to
fraction, it converts your decimal into a fraction over a power of 10 based on its number of
decimal places, then simplifies it by dividing both the numerator and denominator by their
greatest common divisor (GCD), so you always get the fraction in lowest terms. If the result
is greater than 1, it's also shown as a mixed number for convenience.
Common searches this tool answers
Convert fraction to decimal
Convert decimal to fraction
What is 3/4 as a decimal?
What is 0.75 as a fraction?
Mixed number to decimal converter
Fraction to percent calculator
How to use it
Choose "Fraction → Decimal" or "Decimal → Fraction" depending on your starting point.
For fractions: enter the numerator and denominator, plus a whole number if you have a mixed number.
For decimals: enter the decimal value directly (negative numbers work too).
Click the convert button to see your result, plus the equivalent percentage and (for decimals) the mixed number form.
Use the reference chart below for the most commonly needed conversions without typing anything.
Frequently asked questions
How do you convert a fraction to a decimal?
Divide the numerator by the denominator. For example, 3/4 becomes 3 divided by 4, which equals 0.75. For a mixed number like 2 1/4, convert the fractional part and add it to the whole number, giving 2.25.
How do you convert a decimal to a fraction?
Write the decimal as a fraction over a power of 10 matching its decimal places (0.75 becomes 75/100), then simplify by dividing both the numerator and denominator by their greatest common divisor, giving 3/4.
What is a repeating decimal?
A repeating decimal is one where a digit or group of digits repeats forever, like 1/3 = 0.333... This calculator rounds repeating decimals to a set number of digits and marks them so you know the true value continues.
Can this tool handle negative numbers?
Yes, both the fraction-to-decimal and decimal-to-fraction converters accept negative values and will show the correct sign in the result.
Why is my fraction not fully simplified?
This shouldn't happen — the calculator always reduces fractions to lowest terms by dividing both numbers by their greatest common divisor. If a result looks unsimplified, double check the numerator and denominator you entered.
Keywords
fraction to decimal converter, decimal to fraction converter, fraction to decimal calculator,
mixed number to decimal, decimal to fraction calculator, simplify fraction calculator,
fraction to percent converter, convert fraction online free, repeating decimal calculator
Use this free grade calculator to find your overall course grade when different categories - like homework, quizzes, exams, and participation - count for different percentages of your final mark. Add each category with its weight and your score, and this tool works out your weighted average instantly - no sign-up required.
Step 1: Enter your grade categories
Category name
Weight (%)
Your score (%)
Total weight: 0%
Overall grade
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Letter grade
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Total weight used
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Step 2 (optional): What do I need on the rest?
If part of your grade isn't finished yet, find the average score you need on the remaining weight to hit a target grade.
What is a weighted grade calculator and why it matters
A weighted grade calculator combines scores from different categories - such as homework, quizzes, exams, and participation - according to how much each one counts toward the final grade. This matters because a simple average of all your scores can be misleading when categories are weighted unevenly; a 95% on a 5%-weight quiz affects your grade far less than an 80% on a 40%-weight final exam, and averaging them equally would give a wrong picture of where you actually stand.
How this calculator works
Each category's score is multiplied by its weight to get a weighted contribution, all the weighted contributions are added together, and the total is divided by the sum of the weights entered. If your weights add up to less than 100%, the calculator still works correctly by normalizing against the total weight you've entered, so you can calculate a grade even with only some categories filled in.
Common searches this calculator answers
How do I calculate my grade with different category weights?
What is my overall grade if homework is 20% and exams are 50%?
What score do I need on the final to get a certain grade?
How do weighted averages work for school grades?
What letter grade corresponds to my percentage?
How to use it
Enter each grading category name, its weight as a percentage, and your score in that category.
Click "+ Add category" for as many categories as your course has.
Click Calculate grade to see your overall percentage and letter grade.
If part of the course isn't graded yet, use Step 2: enter your current grade, the weight already completed, and your target grade to see what average you need on the rest.
Grading scale used for letter grade
Percentage
Letter grade
Percentage
Letter grade
93-100
A
73-76
C
90-92
A-
70-72
C-
87-89
B+
67-69
D+
83-86
B
63-66
D
80-82
B-
60-62
D-
77-79
C+
below 60
F
Tips
Double check your course syllabus for exact category weights - they're usually listed there and can vary a lot between classes.
Use Step 2 early in the semester to understand how much the remaining work can realistically move your grade.
If the needed score in Step 2 comes back above 100%, it means your target isn't mathematically reachable with the remaining weight - you'd need to make up ground elsewhere, like extra credit if it's offered.
Recalculate after each new grade is posted to keep an up-to-date picture of where you stand.
Frequently asked questions
Is this grade calculator free to use?
Yes. It is completely free, works in your browser, and does not require any sign-up or download.
What if my category weights don't add up to 100%?
The calculator normalizes by the total weight you've entered, so it still produces an accurate grade even if you haven't entered every category yet.
Does this calculator save my grades?
No. Everything runs in your browser and nothing is stored or sent anywhere.
Can I use this for college and high school courses?
Yes. It works for any course that uses weighted categories, though the letter grade cutoffs shown are a common standard - your school may use slightly different cutoffs.
What does it mean if my needed score is above 100%?
It means your target grade is not achievable through the remaining graded work alone, since even a perfect score wouldn't be enough to reach it given the weight remaining.
Related searches
grade calculatorweighted grade calculatorfinal grade calculatorwhat do i need on my finalcourse grade calculator freepercentage to letter grade calculator
Use this free percentage change calculator to find the percent increase or decrease between two numbers, or to increase or decrease a value by a specific percentage. Switch between modes to match what you need - a percentage increase calculator, a percentage decrease calculator, or a straightforward percent difference calculator - all in one tool.
0%
Percentage change
0
Difference
-
Direction
0
New value
0
Amount added
0
New value
0
Amount subtracted
What is percentage increase and decrease, and why it matters
A percentage change describes how much a number has grown or shrunk relative to its starting value, expressed as a percentage rather than a raw difference. This matters because a raw difference alone can be misleading - going from 10 to 20 and going from 1,000 to 1,010 are both a difference of 10, but one is a 100% increase and the other is barely a 1% increase. Percentage change is used constantly in everyday and professional contexts: tracking a price increase, comparing sales growth between two periods, understanding a pay raise, or figuring out how much a discount actually saves you. Knowing the correct formula - and which number is the "starting" value - avoids a common mistake where people accidentally calculate the percentage relative to the wrong number. Getting this backwards is one of the most frequent small errors in everyday percentage math, and it produces a plausible-looking but incorrect answer rather than an obvious one.
How this calculator works
For percentage change between two numbers, this tool uses the formula ((new value - old value) / old value) x 100, which always measures the change relative to the original starting value, not the new one. A positive result is shown as an increase and a negative result as a decrease. For the increase and decrease modes, the calculator works in the opposite direction: it multiplies your starting value by (1 + percentage/100) to increase it, or by (1 - percentage/100) to decrease it, giving you the resulting new value directly. All three modes run instantly in your browser as you type, with no page reload and nothing sent to a server.
Common searches this calculator answers
What is the percentage increase or decrease between two numbers?
How do I calculate a percentage increase on a value?
How do I calculate a discount or percentage decrease?
What is the formula for percentage change?
How much did a price, salary, or sales figure change in percentage terms?
How do I find the percent difference between an old and new number?
How to use it
Choose the mode that matches your question - "Find % change," "Increase by %," or "Decrease by %."
For percentage change, enter the old value and the new value.
For increase or decrease mode, enter your starting value and the percentage to apply.
Read the result instantly - the tool updates as you type.
Switch modes at any time without losing your other entries.
Tips
Always use the original, earlier number as the "old value" - percentage change is measured relative to where you started, not where you ended up.
A percentage increase followed by the same percentage decrease does not return you to the original number - work out both steps separately rather than assuming they cancel out.
For discounts, use the decrease mode directly with the discount percentage rather than calculating the discount amount by hand first.
If your old value is zero, percentage change cannot be calculated, since you cannot divide by zero - use the raw difference instead in that case.
Negative percentages in the change mode simply mean a decrease - the size of the number still tells you the magnitude of the change.
Frequently asked questions
Is this percentage increase/decrease calculator free to use?
Yes. It is completely free, works in your browser, and does not require any sign-up or download.
What is the formula for percentage increase or decrease?
The formula is ((new value - old value) / old value) x 100. A positive result is a percentage increase, and a negative result is a percentage decrease.
What happens if the old value is zero?
Percentage change cannot be mathematically calculated when the old value is zero, since it would require dividing by zero. In that case, consider using the raw numeric difference instead of a percentage.
Does increasing a number by a percentage and then decreasing it by the same percentage return the original number?
No. Because each percentage is calculated relative to a different starting value, increasing then decreasing by the same percentage results in a slightly lower number than you started with. Use the increase and decrease modes separately to see this for yourself.
Can I use this to calculate a discount?
Yes. Use the "Decrease by %" mode, enter the original price as the starting value and the discount percentage, and the result will show the discounted price along with the amount saved.
Can I use this for a salary raise or price increase?
Yes. Use the "Increase by %" mode with your current salary or price as the starting value and the raise or increase percentage to see the new amount and how much was added.
Why does my result show a negative percentage?
A negative percentage in the "Find % change" mode simply indicates a decrease from the old value to the new value. The number itself shows the size of that decrease.
