ProReckoner's teacher calculators are built for classroom teachers, tutors, CRT relief teachers and school administrators. Tools cover grading and assessment (mark percentages, GPA, weighted grades, grade boundaries), literacy assessment (reading age, Flesch-Kincaid readability, Lexile conversion, reading speed), classroom planning (student-teacher ratio, lesson time planning, group divider) and teacher business tools (CRT casual pay, report writing word count). Designed for Australian schools with US/international options where relevant.
Grading & Assessment
4 toolsGrade / Mark Percentage Calculator
Convert raw marks to percentages and letter grades instantly. Enter marks achieved and total available for any test, assignment or exam.
Percentage = (Marks ÷ Total) × 100
Australian university standard bands:HD (High Distinction): 85–100% · D (Distinction): 75–84% · C (Credit): 65–74% · P (Pass): 50–64% · F (Fail): 0–49%
School bands vary by state. NSW uses A–E; VIC uses A–F with numerical descriptors.
GPA Calculator (Australian + US)
Calculate GPA from subject grades. Supports Australian 7-point GPA scale and US 4.0 scale. Add up to 8 subjects with individual credit points / units.
GPA = Σ(Grade × Credit Points) ÷ Σ(Credit Points)
Australian 7-point scale: HD=7, D=6, C=5, P=4, P-=3, F=1. A GPA of 5.0 is Credit average; 6.0 is Distinction average.US 4.0 scale: A=4.0, B=3.0, C=2.0, D=1.0, F=0. Most US scholarships require a 3.0 minimum.
Weighted Grade Calculator
Calculate your final grade when assessments have different weightings. Enter up to 6 assessment components, marks and their percentage weights.
Final = Σ(Mark × Weight) ÷ Σ(Weights)
Weights must sum to 100% for a standard final grade. If weights don't sum to 100%, the result is proportionally adjusted.Example: Essay 72% (40%) + Exam 68% (60%) = (72×0.4)+(68×0.6) = 28.8 + 40.8 = 69.6% final.
Grade Boundary Setter
Set custom grade boundaries for any assessment. Enter the total marks and define where each grade starts. Instantly see the mark range for each band.
Criterion-referenced: Boundaries set in advance based on learning outcomes.
Norm-referenced: Boundaries set after assessment based on class performance distribution.
Literacy & Reading
3 toolsReading Age Estimator
Estimate the reading age of any text using the Flesch-Kincaid Grade Level formula. Paste a passage to check if it's appropriate for your students.
FK Grade = 0.39×(words/sentences) + 11.8×(syllables/words) − 15.59
The Flesch-Kincaid Grade Level corresponds to a US school grade. Add 5 to approximate Australian reading age in years (e.g., Grade 5 ≈ Age 10).Flesch Reading Ease (0–100): 90–100 = Very easy; 60–70 = Standard; 0–30 = Very difficult.
Lexile Level Converter
Convert between Lexile measures and approximate Australian year levels and reading ages. Find out what Lexile range suits your students.
Typical Australian Year Level ranges: Year 1: 200–400L · Year 4: 600–800L · Year 7: 900–1050L · Year 10: 1050–1200L.
Words Per Minute (Reading Speed)
Calculate a student's reading speed in words per minute and benchmark against expected WPM for their year level. Use for oral reading fluency assessments.
WPM = (Words ÷ Seconds) × 60
Oral reading fluency benchmarks (words per minute):Year 1: 60–80 WPM · Year 2: 85–100 · Year 3: 100–120 · Year 4: 110–130 · Year 5–6: 120–140 · Year 7+: 130–150
Average adult silent reading: 200–250 WPM.
Classroom & Planning
3 toolsStudent–Teacher Ratio Calculator
Calculate the student-to-teacher ratio for a class, year group or whole school. Compare against Australian national benchmarks.
Ratio = Students ÷ Teacher FTEs
Australian national averages (ACARA 2023):Government primary: ~15:1 · Government secondary: ~12:1 · Catholic schools: ~12:1 · Independent: ~10:1
OECD average: 15:1 (primary) · 13:1 (secondary). Lower ratios generally correlate with better student outcomes.
Lesson Time Planner
Break a lesson into timed segments. Enter your total lesson length and up to 6 activities to get exact start/end times and ensure you stay on track.
Build in 5-minute buffer for transitions. Research suggests students' attention peaks in the first 10 minutes and dips after 20 minutes of passive listening.
Class Size & Group Divider
Divide a class into equal groups as evenly as possible. See exact group sizes and how to handle any remainder students. Works for any class size.
Pairs (2): Think-pair-share, peer reading, peer feedback.
Small (3–4): Collaborative tasks, problem solving, investigation. Most effective for cooperative learning.
Medium (5–6): Projects, debates, role plays.
Larger groups (7+) often have reduced individual accountability.
Teacher Business
2 toolsCasual Relief Teacher (CRT) Pay Calculator
Estimate your CRT daily rate and weekly/monthly earnings by state. Includes standard casual loading and superannuation (11.5%). Select your state and classification.
Note: Rates are estimates based on publicly available award rates. Actual pay may vary by EBA, school, and individual negotiation. Always check your state's current enterprise agreement.
Key EBAs: Victorian VGSA · NSW Crown Employees · Qld State School Teachers EB.
Report Writing Word Count Tracker
Plan your report writing workload. Enter your class size, target words per student report, and average typing speed to see how long reports will take.
• Write across 2–3 weeks rather than a single marathon session
• Use comment banks for common observations, customised per student
• Aim for 5–8 reports per sitting to maintain quality and avoid fatigue
• Allocate 5–10 minutes per report including review time
• Schools typically allow 3–4 minutes per student in total report time during paid hours.