The service

PhysRef provides physics formulas, constants, calculators, and unit conversion in your browser. The core reference is free to use. We may update, add, or remove features over time.

Premium subscriptions

PhysRef Premium is an optional auto-renewing subscription that unlocks additional features. Checkout and billing are handled by RevenueCat and Stripe under their own terms. Prices are shown before purchase, and your subscription renews until cancelled. You can cancel at any time via the billing management link in your receipt email; access continues until the end of the paid period.

Refunds

Not happy with a purchase? Email [email protected] within 14 days of a first purchase, or within 7 days of a renewal, and we will refund it. Send the message from the email address you used at checkout, and include:

the email address used at checkout (if you are writing from a different address)
your access code, shown on the Premium page while you are signed in on the browser you purchased from
roughly when you purchased, and which plan (weekly, yearly or lifetime)
the last 4 digits of the card, if you have the receipt handy

That is everything needed to find the purchase and process the refund. This policy does not limit any statutory rights you may have.

No warranty

The reference is provided "as is" for educational use. While we work to keep formulas, constants, and calculators accurate, always verify results before relying on them for exams, engineering, or professional work. To the maximum extent permitted by law, PhysRef is not liable for losses arising from use of the app.

Changes & contact

We may revise these terms; material changes will be reflected on this page. Questions about the terms, billing, or anything else: [email protected].