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Exposure Calculator (EV)

Science & Engineering

EV value, equivalent combos, ND stops

Quick Answer

Exposure Calculator (EV): EV value, equivalent combos, ND stops. Exposure Calculator (EV) uses standard science & engineering formulas to compute accurate results instantly.

Aperture (f/)

Shutter

EV 11.9
Closest scene：Overcast daylight（EV 12）

Calculation steps

  1. 1EV = log₂(N²/t) = log₂(5.6²/1/125) = log₂(3920) = 11.9
  2. 2Closest scene: Overcast daylight (EV 12)

EV reference (ISO 100)

EVScene
16Bright sun, snow/beach
15Sunny 16 rule daylight
12Overcast daylight
8Bright indoor / shade
5Home lighting
2Night street
-3Full moon landscape
Sunny 16 rule: in bright daylight, set f/16 and shutter = 1/ISO (ISO 100 → 1/100s) for a correct exposure. Reciprocity: opening one aperture stop = doubling the shutter speed. ND1000 (10 stops) turns 1/30s into ~30s — the classic silky-water daylight setup.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Exposure Calculator (EV).
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Exposure Calculator (EV) is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: EV value, equivalent combos, ND stops.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Exposure Calculator (EV) formula

Exposure Calculator (EV) uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Exposure Calculator (EV)?
Open the page and fill in the input fields — results update automatically. EV value, equivalent combos, ND stops.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

Maintained and periodically reviewed by the YiJianSuan editorial team — review process in ourEditorial Policy.

Cite this page: YiJianSuan. Exposure Calculator (EV)[EB/OL]. https://www.yijiansuan.com/en/c/science/exposure

Results provided by this tool are for reference only and do not constitute professional advice.