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Koydo Calculator · Free Tool
Smarter math, zero cost
A full-featured educational calculator with scientific, graphing, unit conversion, and statistics modes. Built for students — completely free, no subscription ever.
- Scientific
- Graphing
- Unit Converter
- Statistics
Explore by topic
High School · College
Scientific
Trig, logarithms, exponents, and all standard scientific functions -- ready for exams.
Middle School · High School · College
Graphing
Plot equations, visualise functions, and explore curves interactively on a clean canvas.
Ages 3+
Unit Converter
Length, mass, volume, temperature, speed, data -- every unit you need in one place.
High School · College
Number Bases
Binary, octal, hex -- convert and compute in any number base instantly.
High School · College
Statistics
Mean, median, standard deviation, and simple regression tools for data analysis.
What makes Koydo Calculator different
- No Account Needed — Open and use the calculator instantly -- no sign-in, no subscription, no barriers.
- Works Offline — Full functionality without an internet connection -- ideal for exams and classrooms.
- Clean Design — Distraction-free layout with large, touchable buttons designed for focused problem-solving.
- Integrated Learning — Jump from any calculation straight to the related Koydo lesson to deepen your understanding.
See Koydo in action
Simple pricing
Always Free
FREE
Every feature, no subscription required.
- Scientific calculator
- Graphing & visualisation
- Unit converter
- Calculation history
- Works offline
Ready to start learning?
Every major subject, covered. Koydo learning apps are ad-free. Start with free access — no card required.