Quick guide
How to use this calculator
- Enter observations in chronological order and choose the visible period or convention.
- Use prices and volumes with consistent units and equally spaced periods where required.
- Read the formula and seeding convention before comparing results with another platform.
Calculation method
Calculation method
EMAₜ = αPriceₜ + (1−α)EMAₜ₋₁, where α = 2 ÷ (n+1).
Technical indicators are deterministic transformations of entered historical data. Approximate floating results are explicitly formatted as estimates.
Worked example
Worked example
Prices 10, 12, 14 with period 3 end at EMA 12.5 under the stated first-price seed.
EMAₜ = αPriceₜ + (1−α)EMAₜ₋₁, where α = 2 ÷ (n+1).
Supported inputs
Precision and limits
Visible input limits
Lists accept up to 2,000 fixed-decimal rows. Period fields disclose their whole-number limits. Approximate indicators reject observations whose significant differences cannot be represented reliably at their entered scale.
No live market data
The page does not fetch prices, volumes, corporate actions, exchange calendars, or benchmark data. Enter adjusted or unadjusted observations deliberately.
Decision boundary
Indicators describe entered history. They do not predict price direction, identify a suitable trade, measure every risk, or recommend an investment.
Calculator-specific assumptions
The first entered price seeds the EMA; other charting platforms may seed differently.