Rifle Scope Calculators
Free tools for UK rifle scope buyers. All calculations use standard optical physics formulae. No sign-up required.
Essential for deer stalking
Exit Pupil Calculator
Calculate exit pupil diameter for any scope — and find out if it matches low-light shooting conditions.
Open calculator →Useful for target & PRSField of View Calculator
Convert angular field of view to linear FOV at any distance. Compare scopes side-by-side.
Open calculator →Useful for dawn & dusk stalkingTwilight Factor Calculator
Calculate a scope's twilight factor and relative brightness. Useful for comparing low-light optics.
Open calculator →Looking for a specific scope? Try the AI Scope Wizard →