Tennis Court Size Calculator
Tennis court dims, area, and net heights, ITF regulation.
What it does
Tennis courts run to exact feet. Doubles spans 78 by 36 with singles sidelines 4.5 ft inside each side, service lines 21 ft from the net, and a net sagging from 3.5 ft at the posts to 3 ft at the center strap. Every line has a number.
The tool above prints regulation dims, area, and net heights for either game in feet or meters. Doubles gives 78 x 36 ft over 2,808 sq ft; singles gives 78 x 27 ft over 2,106. Metric mirrors read 23.77 x 10.97 m and 23.77 x 8.23 m.
The ITF writes these numbers into the Rules of Tennis with USTA printing identical text: 78 ft long, 27 singles and 36 doubles wide, posts 3 ft outside at 3.5 ft high, center strap at 3 ft, service lines 21 ft from net. Runoff and surface guidance fills facility manuals beyond the lines.
Alleys change doubles geometry. The 702 sq ft of tramline rewards angled volleys that singles sidelines erase, while service boxes stay fixed at 21 by 13.5 ft per side. Build to the lines first; fences and runoff follow facility guides.
How to use
- Pick doubles or singles.
- Pick imperial (ft) or metric (m).
- Read dims first, then area.
- Read net heights for posts and strap.
- Mark service lines 21 ft from net.
- Allow runoff space beyond lines.
Formula
- type
- Doubles or singles court selector.
- length
- 78 ft (23.77 m) baseline to baseline.
- width
- 36 ft doubles, 27 ft singles.
ITF Rules of Tennis Rule 1 with USTA identical text; metric equivalents 23.77/10.97/8.23 m.
Worked example
Example: doubles court
Defaults: doubles, imperial. Metric mirrors at 23.77 x 10.97 m.
- Inputs: doubles court, imperial.
- Dims: 78 ft long x 36 ft wide.
- Area: 78 x 36 = 2,808 sq ft.
- Net: 3 ft center strap, 3.5 ft posts.
- Tool shows 78 x 36 ft, 2,808 sq ft, 3 ft center, 3.5 ft posts.
Reference table
| Item | Imperial | Metric |
|---|---|---|
| Length | 78 ft | 23.77 m |
| Doubles width | 36 ft | 10.97 m |
| Singles width | 27 ft | 8.23 m |
| Service line | 21 ft from net | 6.40 m |
| Net center / posts | 3.0 / 3.5 ft | 0.914 / 1.07 m |
Limits
- Line dims only. Runoff and fences excluded.
- ITF regulation; park builds vary.
- Surface pace and bounce unmanaged.
- Drainage slopes need facility guides.
Common mistakes
- Building singles width for doubles play.
- Skipping the 4.5 ft alley math.
- Hanging nets without the center strap.
- Marking service lines off the baseline.
- Forgetting runoff beyond baselines.
Try it yourself
Quick checks. Answers sit tucked under each question.
Singles court area?
78 x 27 = 2,106 sq ft. Alleys 2,808 minus 2,106 = 702 sq ft.
Singles in metric?
23.77 x 8.23 = 195.65 m2. Net 0.914 m center, 1.07 m posts.
Questions
How big is a tennis court?
78 ft long; 36 ft wide doubles, 27 ft wide singles (ITF). Areas 2,808 and 2,106 sq ft.
How far inside are singles lines?
4.5 ft inside doubles lines each side: (36-27)/2. Alleys total 702 sq ft.
How high is the net?
3 ft (0.914 m) at center strap, 3.5 ft (1.07 m) at posts 3 ft outside doubles lines.
Where is the service line?
21 ft (6.40 m) from the net each side, between the singles sidelines.
How deep is the service box?
18 ft from service line to baseline (39 minus 21). Service boxes run 21 x 13.5 ft singles.
What are metric dims?
23.77 x 10.97 m doubles (260.87 m2); 23.77 x 8.23 m singles (195.65 m2).