Add movement while keeping Speed separate
With Speed 30 feet, taking the Dash action under the 2024 rules adds 30 feet of movement for the turn under those conditions. Up to 60 feet are available in total; you need not rewrite the character’s Speed as 60. If 20 feet of normal terrain have already been crossed, 40 remain from that total budget.
This example assumes one Dash action, unmodified Speed, normal terrain and no other rule limiting the path. It is not an observed automatic DMGrid calculation.
Resolve the turn before moving the piece
Imagine a scout crossing a courtyard. She moves 20 feet, chooses Dash as her action and wants to move another 35. The complete route would be 55 feet: within the available 60, leaving 5. She does not gain a fresh 60 after her initial movement.
A short note could read: “Speed 30; Dash +30; traveled 20+35; 5 remain.” It preserves both the action decision and movement already spent. Merely changing Speed hides the source of the extra movement.
Use the current conditions
The official D&D 2024 glossary says Dash’s extra movement equals Speed after modifiers. If Speed 30 is reduced to 15, one Dash allows up to 30 feet that turn, not 60.
Do not turn a drawn radius into permission to cross any obstacle. Our 55-foot calculation assumes normal terrain. Changes to terrain, conditions or route require resolving the cost again using the table’s rules before moving the piece.
Let the board support a manual decision
The DMGrid facts document a tactical board, distance ruler, turn order, notes and circular walking/running ranges. Represent the path and retain the arithmetic as a manual reference. This guide does not claim the software spends the action, applies modifiers or resolves obstacles automatically.
Before the next turn, check which action was used and where the piece ended. If someone corrects the distance, retain that correction in the count rather than pretending the initial segment never happened.
Check the fit for your table
DMGrid is a paid Windows beta for running an in-person game from one computer, without browser multiplayer. Review the product website and information before buying. The example teaches a 2024 rules decision, not a guarantee that every table uses that edition or the same variants.