CalcRef Premium
Stop re-deriving. Start remembering.
The reference stays free - every formula, every condition, a worked example on each page. Premium adds the two things a free reference can't give you: the printed page you revise from, and practice that knows which topics you keep missing.
- 14 printable sheets
- 365 rules typeset
- 141 step-by-step solutions
- 8 topics to quiz on
Choose a plan
Unlock everything
- Printable formula sheets - 14 print-ready pages covering 365 rules, identities and formulas, with headers that repeat on every printed page and breaks that fall between sections
- Step-by-step worked solutions - 141 of them, at least one on every single formula page, on top of the free worked example each page already shows
- Quizzes on the topics you pick - any combination of the 8 topics, instead of the mixed daily round
- A freshly randomised round whenever you want one - the free daily quiz can be replayed as often as you like, but it is the same 10 questions until tomorrow
- The full progress dashboard: per-topic accuracy bars, plus the list of your recent quizzes - this browser keeps your most recent 500 results
Weekly, yearly and lifetime plans. Live prices load below; the yearly plan shows its per-week equivalent so you can compare.
Good to know
Questions
What stays free?
Every formula page and topic page, all reference tables, the math constants, the 16-category unit converter, the expression evaluator, 136 worked examples (one per formula), a 10-question daily quiz round you can replay as often as you like, and a sample of every printable sheet - the real column layout and its first 6 rows - stay free forever, no account needed. The sheets sell the format, never the mathematics: every row on them is readable for nothing on the page it came from.
What exactly is behind the paywall?
Study depth and one artifact - never the reference itself. Every formula page shows its statement, conditions, variables and a full worked example for free; the remaining 141 step-by-step solutions, topic-chosen and freshly randomised quiz rounds, the per-topic progress breakdown and the complete printable sheets are Premium. The daily quiz round itself has no replay limit - Premium changes which questions you get, not how many rounds you may take.
If the formulas are free, what am I paying for on the sheets?
The format, not the facts. All 365 rows across the 14 sheets are readable for nothing on the formula and topic pages they come from. What Premium unlocks is the artifact those pages cannot be: one typeset page per sheet, column headers repeating at the top of every printed page, breaks falling between sections rather than mid-run, high-contrast black-on-white output, and the print button. The first 6 rows of every sheet render for everyone in the real column layout, so you can judge the page before paying for it.
How is my access stored?
Purchases are handled by RevenueCat and Stripe. An anonymous purchase id is kept in this browser so CalcRef recognises your Premium access on this device. Keep your receipt email for recovery.
I already subscribed on another device - how do I get access here?
Open the Premium page on the device where you subscribed, copy the access code shown there (or use your receipt), then restore it on this browser.
Can I cancel?
Yes. Subscriptions renew automatically and can be cancelled anytime from the link in your receipt email. Lifetime is a one-time payment.
I lost my access code - can you help?
Yes. Email [email protected] from the email address on your receipt, and we can look up your access code.
Not ready yet?
The free reference is the whole reference
Every formula page and topic page, all reference tables, the math constants, the 16-category unit converter, the expression evaluator, 136 worked examples (one per formula), a 10-question daily quiz round you can replay as often as you like, and a sample of every printable sheet - the real column layout and its first 6 rows - stay free forever, no account needed. The sheets sell the format, never the mathematics: every row on them is readable for nothing on the page it came from.