Experimental Design Diagram Maker

Figran

Use an experimental design diagram to map variables, levels, trials and constants, or groups and treatments on a timeline.

  • Variables or groups and timeline
  • Editable examples
  • Free SVG and 300 DPI PNG
Diagram
Independent variable

Levels

Dependent variables
Constants
Options
Preview
Plant growthPlant growth. Hypothesis: Fertilizer affects plant height. Independent variable: Fertilizer (g). 0 (Control); n = 5. 5; n = 5. 10; n = 5. 15; n = 5. Dependent variables: Plant height after 21 days (cm); Measured as: Height from soil to the tallest leaf tip, measured with a ruler on day 21. Constants: Light; Water; Soil; Pot size; Plant varietyPlant growthHypothesis: Fertilizer affects plant heightFertilizer (g)Levels of IV0Control51015Number oftrials5555DEPENDENT VARIABLESPlant height after 21 days (cm)MEASURED AS: Height from soil to the tallest leaf tip, measured witha ruler on day 21CONSTANTSLightWaterSoilPot sizePlant variety

Experimental design diagram examples

Explore experimental design diagram examples for variables, factorial designs, group timelines and crossover trials.

Hypothesis: Fertilizer affects plant height. Independent variable: Fertilizer (g). 0 (Control); n = 5. 5; n = 5. 10; n = 5. 15; n = 5. Dependent variables: Plant height after 21 days (cm); Measured as: Height from soil to the tallest leaf tip, measured with a ruler on day 21. Constants: Light; Water; Soil; Pot size; Plant variety

Experimental design diagram template: plant growth

A classroom design comparing fertilizer levels.

4 levels · 5 trials per level

Hypothesis: Vitamin C dose and delivery method affect tooth growth in guinea pigs. Independent variable: Supplement. Second independent variable: Dose (mg/day). Supplement: OJ; Dose (mg/day): 0.5; n = 10. Supplement: OJ; Dose (mg/day): 1; n = 10. Supplement: OJ; Dose (mg/day): 2; n = 10. Supplement: VC; Dose (mg/day): 0.5; n = 10. Supplement: VC; Dose (mg/day): 1; n = 10. Supplement: VC; Dose (mg/day): 2; n = 10. Dependent variables: Odontoblast length. Constants: 60 guinea pigs

2×3 factorial design: vitamin C and tooth growth

Compare two delivery methods and three doses.

Source: R ToothGrowth

Mouse dosing timeline

A mouse experiment timeline with daily dosing and tumor measurements.

40 mice · 4 groups · 21 days

Cell treatment groups

Compare transfection and drug treatment in cultured cells.

4 groups · 48 hours

Research design diagram: pretest–posttest control group

Compare changes across an intervention and control group.

Source: Campbell & Stanley, 1963 (design)

Crossover trial timeline

Two sequences receive treatments in opposite orders.

Source: Senn, 2002 (design)

How to make an experimental design diagram

Build an experimental design diagram step by step and see the preview update as you edit.

  1. 1Choose a diagram

    Choose a variables diagram or a groups timeline.

  2. 2Groups or levels

    Name your groups or variable levels.

  3. 3Events or constants

    Set event times or list constants.

  4. 4Download or edit

    Save PNG or SVG, or keep editing in canvas.

Parts of an experimental design

An experimental design diagram can show independent and dependent variables in biology and other fields.

  1. 1Independent variable: the factor you change.
  2. 2Levels: the values or categories being compared.
  3. 3Control: a reference for comparison.
  4. 4Trials: repeated observations at each level.
  5. 5Dependent variable: the outcome you measure.
  6. 6Constants: conditions kept the same.

What a design figure should show

ARRIVE 2.0 itemHow to show itTool field
Study designLabel groups and controlsGroups
Sample sizeShow the number in each groupSample size (n)
RandomizationState allocation when usedAllocation
BlindingDescribe it in the figure legendNot assessed by this tool
Experimental proceduresShow treatment and measurement timingEvents

This page draws what you enter; it does not check the design. ARRIVE 2.0 · NC3Rs Experimental Design Assistant

Experimental design diagram FAQ

What is an experimental design diagram?

An experimental design diagram shows variables, levels, trials, operational definitions and constants, or research groups and treatments on a timeline.

What is the difference between a control group and an experimental group?

A control is a comparison reference, receiving no treatment or a standard treatment. An experimental group receives the treatment being tested.

What are constants in an experiment?

Constants are conditions kept the same across groups; list them in Variables.

How do I draw a 2×2 factorial design?

Enable a second independent variable and enter two levels for each. Each cell represents a combination.

How do I diagram a pretest–posttest control group design?

Create two groups, add pretest and posttest measurements, and add the intervention to the experimental group.

How do I show a timeline of treatments and measurements?

In Groups and timeline, add treatments and measurements as timed events for each group. Use the figure in a paper, Methods section or animal ethics application.

Can I edit the diagram in PowerPoint?

Edit in canvas to continue editing and export PPTX, or insert the downloaded SVG.

Does this tool check whether my design is sound?

No. It draws your inputs; consult ARRIVE 2.0 or the NC3Rs Experimental Design Assistant for design guidance.

Is my design uploaded?

The draft stays in this browser tab. Canvas handoff uses a local token.

Make your experimental design diagram

Turn your study design into an editable figure.