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🎓 EducationFree
Multiple choice exam score
18 right, 4 wrong and 3 blank with a quarter-mark penalty give 17 out of 25, or 68%. Enter the three tallies, the marks per question and any guessing penalty…
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🎓 EducationFree
Next spaced repetition interval calculator
A card reviewed after a 6-day gap with an ease factor of 2.5 is due again in 15 days. Enter the previous gap and the factor, and get the next interval, rounded…
B
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🎓 EducationFree
Participation Weighted Grade Calculator
Assignments at 84, exams at 78 and participation at 95, weighted 40, 45 and 15 percent, give a course grade of 82.95.
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🎓 EducationFree
Score Above Mean Calculator
A score of 86 in a class averaging 74 with a standard deviation of 8 sits 12 points above the mean, or 1.5 standard deviations.
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🎓 EducationFree
School percentage change calculator
Average reading minutes that move from 40 to 50 rose by 25%, while going back from 50 to 40 is a 20% fall, because the starting point changes.
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🎓 EducationFree
Percentage to fraction for school
35% becomes 35/100, and dividing both terms by their greatest common divisor, 5, gives 7/20. Every step of the school method is shown, decimals such as 12.5%…
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🎓 EducationFree
Percentile band classifier
A student at the 72nd percentile is in the average band, which runs from the 25th to the 75th. Enter any percentile from 0 to 100 and get one of five fixed…
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🎓 EducationFree
Plus and minus GPA converter
An A minus is worth 3.7 and a B plus 3.3, not the 4.0 and 3.0 of the plain letters. Paste one grade or a whole list and see each grade's points from a fixed…
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🎓 EducationFree
Points Lost to Target Grade Calculator
In a 500-point course with a 90 percent goal you can lose 50 points in total, so with 35 already gone, 15 remain.
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🎓 EducationFree
Points needed for letter grade
With 650 of 1,000 points, an A needs 900, so you are 250 points short. Enter your points, the course total and the letter you want to see the gap and whether it…
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🎓 EducationFree
Pomodoro Finish Time Estimator
Starting at 09:00, eight Pomodoros end at 13:05: 200 minutes of focus plus 45 minutes of breaks, with no break tacked on after the last session.
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🎓 EducationFree
Prime Factorization for School
360 becomes 2³ × 3² × 5, and you see each rung of the division ladder: 360, 180, 90, 45, 15, 5 and finally 1.
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🎓 EducationFree
Q&A questions in time calculator
Twenty minutes of Q&A at 3 minutes per exchange fits 6 complete questions, uses 18 minutes and leaves 2 spare.
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🎓 EducationFree
Range of grades calculator
With five grades whose highest is 91 and lowest is 68, the range is 23: the highest minus the lowest.
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🎓 EducationFree
Text grade level from length
Three short sentences with 16 words and 17 syllables score below first grade, at an early elementary level.
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🎓 EducationFree
Reading speed needed for a deadline
With 40 pages of 250 words each and 100 spare minutes, you need to read 100 words per minute to finish on time.
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🎓 EducationFree
Round to decimal places
Round 3.14159 to two decimal places and you get 3.14; to four, 3.1416. Choose from zero to fifteen places and see the number before and after, rounded half away…
A
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🎓 EducationFree
Rubric Weighted Score Calculator
Research at level 4 with a weight of 0.40, reasoning at 3 with 0.35 and writing at 5 with 0.25 add up to 3.9 on the same level scale.
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🎓 EducationFree
SAT total score combiner
A Reading and Writing score of 640 plus a Math score of 700 gives an SAT total of 1340. Enter both section scores, each from 200 to 800 in steps of ten, and an…
S
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🎓 EducationFree
Scale grade to new maximum
42 out of 50 becomes 84 out of 100, or 8.4 out of 10: the same 84% stretched onto the new maximum.
A
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🎓 EducationFree
Scale raw test score calculator
A raw score of 42 on a range from 10 to 50 becomes 80 on a 0 to 100 scale, because it sits 80% of the way along.
B
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🎓 EducationFree
Scientific notation for school
45,000 becomes 4.5 × 10^4 and 0.0032 becomes 3.2 × 10^-3, with steps that show the coefficient, the exponent and which way the decimal point moved.
K
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🎓 EducationFree
Script reading time by WPM
A 900-word script takes 6 minutes to deliver aloud at 150 words per minute, but only 3:47 to read silently at 238.
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🎓 EducationFree
How Many Slides Do You Need for a Presentation?
A 30-minute talk at 2 minutes per slide needs 15 slides. Enter the speaking time and your average pace per slide; the count is rounded to whole slides and you…
B
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🎓 EducationFree
Words per slide budget
A 1,200-word script on 12 slides puts 100 words on each one, 60 over the usual 40-word ceiling. Enter the words and the slide count to see the density and how…
A
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🎓 EducationFree
Speech length vs time limit checker
A 26-word opening read at 130 words per minute takes 12 seconds, leaving 48 seconds of a one-minute limit.
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🎓 EducationFree
Speech time from syllables
600 syllables at 4 syllables per second take 150 seconds, or 2 minutes 30 seconds, to say aloud. Enter the syllable total from your script and a realistic…
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🎓 EducationFree
Stanine from percentile calculator
A percentile rank of 72 is stanine 6, the band covering percentiles 60 to 76, read as average. Enter any rank from 1 to 99, decimals included, and get the…
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🎓 EducationFree
Study hours per credit calculator
Fifteen credits at two study hours per credit mean 30 hours of study a week outside class; at three hours per credit, 45.
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🎓 EducationFree
Thesis length estimator
Plan a thesis chapter by chapter: six chapters totalling 29,500 words, double-spaced, come to 121 pages, or 148 with 9 front matter and 18 reference pages.
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🎓 EducationFree
Exam time per question calculator
A 90-minute exam with 60 questions gives 90 seconds per question, or 1.5 minutes each, and a pace of 40 questions per hour.
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🎓 EducationFree
Unique words count calculator
In “The quick brown fox jumps over the lazy dog. The fox is quick!” 9 of the 13 words are distinct and 4 are repeats.
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🎓 EducationFree
Vocabulary words to goal
If you know 2,500 words and aim for 5,000, you still have 2,500 to learn and you are 50 % of the way there.
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🎓 EducationFree
Weighted course grade calculator
Homework 92 at 20%, quizzes 85 at 15%, midterm 78 at 25% and final 88 at 40% give a course grade of 85.85%.
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🎓 EducationFree
Weighted GPA with honors calculator
An AP A counts as 5.0 and an honors B+ as 3.8: with two regular courses at A- and B, the weighted GPA is 3.88 against 3.5 unweighted.
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🎓 EducationFree
Weighted grade average by category calculator
Homework 88 at weight 20, projects 94 at 35 and exams 81 at 45 average to 86.95. The weights can total 100, 1 or any positive number, and the breakdown shows…
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🎓 EducationFree
Weighted score out of total
Homework 85/100, a midterm 16/20 and a final 42/50, weighted 30, 30 and 40, give a mark of 16.62 out of 20.
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🎓 EducationFree
What Percent Is X of Y? Percentage Calculator
18 out of 24 is 75%, and 30 compared with 24 is 125%: enter the part and the whole to see what percentage one is of the other, along with the decimal ratio and…
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🎓 EducationFree
Average words per sentence
Two sentences with 11 words in total average 5.5 words per sentence, a very simple pace. Paste any text to get its word count, sentence count and mean sentence…
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🎓 EducationFree
Words to pages estimator
2,500 words in 12-point text, double-spaced with one-inch margins on Letter paper, come to just over 9 pages, so 10 sheets: 270 words fit on each page.
S
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🎓 EducationFree
Words to paragraphs estimator
1,500 words at 100 words per paragraph make 15 paragraphs with nothing left over. Enter your target word count and a typical paragraph length to get the exact…
A
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🏗️ Engineering & constructionFree
Standby power cost calculator
A 5 W charger plugged in all day, every day, uses 43.8 kWh a year. Enter the idle watts and your price per kWh to see what that standby draw costs per day…
S
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🏗️ Engineering & constructionFree
Area by coordinates calculator
The corners (0,0), (4,0), (4,3) and (0,3) enclose an area of 12, listed counterclockwise. Paste a lot’s corner coordinates in boundary order, closed or open…
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🏗️ Engineering & constructionFree
Azimuth and distance from coordinates calculator for survey stations
From a station at 5000 E, 10000 N to one at 5125.5 E, 10175.25 N, the target lies 125.5 east and 175.25 north, at a grid azimuth just over thirty-five and a…
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🏗️ Engineering & constructionFree
Band brake torque calculator
A tight-side tension of 1200 N and a slack side of 400 N on a drum of radius 0.25 m give a braking torque of 200 N·m.
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🏗️ Engineering & constructionFree
Metal bar weight by material
A 20 mm steel rod 1 m long weighs about 2.466 kg at 7850 kg/m³; the same size in aluminum, at 2700 kg/m³, is far lighter.
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🏗️ Engineering & constructionFree
Simply supported center-load deflection calculator
A center load of 48 on a span of 2, with a modulus of 200 and a second moment of area of 4, gives a midspan deflection of 0.01 in coherent units.
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🏗️ Engineering & constructionFree
Bearing life hours calculator
An L10 rating of 50 million revolutions at 1200 RPM equals 694.444444 operating hours, about 28.935185 days of continuous running.
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🏗️ Engineering & constructionFree
Belt Wrap Angle Calculator for Open Belt Drives
Pulleys of 100 and 250 with their centers 600 apart leave the belt wrapped 165.638488° around the small pulley, or 2.890936991 radians.
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🏗️ Engineering & constructionFree
Bolt group eccentric shear calculator
Four bolts on a 3 by 3 square with 1000 pushing down 3 units from the centroid: the worst bolt takes 500 downward plus 250 sideways, while the direct share is…
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🏗️ Engineering & constructionFree
Overhead conductor tension calculator
A 100 m span carrying 1 N per metre with 2 m of midspan sag needs 625 N of horizontal tension under the parabolic rule for level spans.
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🏗️ Engineering & constructionFree
Conductor Resistance Calculator
A 25 m conductor with a 2.5 mm² cross-section and a resistivity of 1.68 × 10⁻⁸ ohm-metres has a resistance of 0.168 ohms.
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🏗️ Engineering & constructionFree
Pipe continuity velocity calculator
When the inlet area is twice the outlet area, a liquid entering at 2.5 m/s leaves at 5 m/s. Give the inlet velocity and the area ratio to check contractions and…
K
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🏗️ Engineering & constructionFree
Convective Heat Transfer Calculator
A 2 m² surface at 80 °C in a fluid at 20 °C, with a film coefficient of 25 W/m²·K, gives off 3000 W by convection.
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🏗️ Engineering & constructionFree
Crank mechanism torque calculator
At 90 degrees the whole piston force turns the crank, while at 0 degrees even a large force gives zero torque.
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🏗️ Engineering & constructionFree
Critical Crack Length Calculator
With a toughness of 50 MPa√m, a stress of 250 MPa and the default geometry factor of 1.12, the critical crack is about 10 mm.
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🏗️ Engineering & constructionFree
Electrical demand load calculator
A connected load of 125 kVA with an 80 percent demand factor gives a diversified demand of 100 kVA, a reduction of 25 kVA.
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🏗️ Engineering & constructionFree
Direct Shear Stress Calculator for Pins, Bolts, and Rivets
A 12000 N force on a pin in double shear, with 0.0002 m² per plane, gives an average shear stress of 30 MPa.
B
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🏗️ Engineering & constructionFree
Duct air velocity calculator
An airflow of 1.2 m³/s through a duct with 0.3 m² of internal area moves at 4 m/s on average, or 14.4 km/h.
K
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🏗️ Engineering & constructionFree
Engineering Stress from Load Calculator
A 12500 N load on a tensile specimen with 50 mm² of original area gives an engineering stress of 250 MPa.
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