The calculator
that just answers the question.
Final grades. Tip splits. Concrete volumes. Word counts. Fifty calculators, seven categories — each one does its job and shows its work.
- Calculators
- 50
- Categories
- 7
- Ads
- 0
Current grade
86.4%
Final weight
30%
Final score
92.0%
Final course grade
88.08%
Pre-final
86.4%
Delta
+1.68 pts
Letter
B+
We show the math
Every calculator has a How it works section with the actual formula. No black boxes.
Live as you type
Numbers update the moment your inputs change. No Calculate button, no spinner.
Privacy-minded
No ads. No account required. We use lightweight analytics to see what's useful — never to follow you around the web.
Featured
Start with these
The calculators most people open first.
Bible
Gematria Calculator
Compute English, Hebrew, and Greek gematria for any word or phrase across six ciphers, with a letter-by-letter breakdown.
Education
Final Grade Calculator
Calculate your final course grade from your current grade and your final exam score.
Writing
Word Counter
Count words, characters, sentences, and paragraphs in real time, with reading and speaking time estimates.
Pets
Dog Age Calculator
Convert your dog's age to human years using the modern logarithmic formula, with breed-size adjustments.
Home
Cubic Yard Calculator
Find the cubic yards you need for concrete, gravel, mulch, or soil from length, width, and depth — with weight estimates.
Money
Discount Calculator
Apply a percentage discount to any price and see savings, sale price, and total — with optional sales tax.
By category
Browse by what you’re solving
Education
12Grade math for students and parents — final grades, weighted averages, and the score you need on the final.
- Final Grade
- Weighted Grade
- Final Exam
- College GPA
- Pythagorean Theorem
- +7 more
Home
06Project calculators for around the house — concrete and gravel by volume, with bag and tonnage estimates.
- Concrete
- Gravel
- Cubic Feet
- Cubic Yard
- Mulch
- +1 more
Money
08Quick money math you reach for at the table or the register — tips, splits, and sales tax.
- Tip
- Sales Tax
- Dividend
- Discount
- Credit Card Payoff
- +3 more
Writing
07Real-time word and character counts with platform presets, reading times, and limit tracking.
- Word
- Character
- Syllable
- Sentence
- Readability
- +2 more
Pets
08Modern dog- and cat-age conversions to human years, grounded in current veterinary research.
- Dog Age
- Cat Age
- Puppy Weight
- Dog Food
- Cat Food
- +3 more
Bible
03Gematria and biblical numerology — letter-to-number ciphers with clear, side-by-side breakdowns.
- Gematria
- Hebrew Gematria
- Greek Gematria
Health
06Body-baseline calculators — daily energy expenditure and other estimates grounded in the standard formulas.
- TDEE
- BMI
- BMR
- Body Fat
- Ideal Weight
- +1 more
How we work
Every calculator shows its work.
The formula, the assumptions, and any caveats live on the same page as the result. Read the methodology if you want to see exactly how we build them.