Time/Temperature Conversion Chart
To use the chart below, find the recommended or normally used development time at 68F.
Follow the column, left or right, until it matches the new temperature column. For
example, if 8 minutes at 68F is recommended, the time at 75F will be 5.5. minutes.
Note: Development times below 5 minutes are not recommended due to the risk of uneven
development.
64F |
66F |
68F |
70F |
72F |
75F |
77F |
80F |
5.0 |
4.5 |
4.0 |
3.5 |
3.25 |
2.5 |
* |
* |
5.5 |
5.0 |
4.5 |
4.0 |
3.75 |
3.0 |
* |
* |
6.0 |
5.5 |
5.0 |
4.5 |
4.0 |
3.25 |
* |
* |
6.5 |
6.0 |
5.5 |
5.0 |
4.5 |
3.5 |
* |
* |
7.25 |
6.5 |
6.0 |
5.5 |
5.0 |
4.0 |
3.75 |
* |
8.0 |
7.25 |
6.5 |
6.0 |
5.25 |
4.5 |
4.0 |
3.5 |
8.75 |
7.75 |
7.0 |
6.5 |
5.75 |
5.0 |
4.5 |
3.75 |
9.25 |
8.25 |
7.5 |
6.75 |
6.0 |
5.25 |
4.75 |
4.0 |
9.75 |
8.75 |
8.0 |
7.25 |
6.5 |
5.5 |
5.0 |
4.25 |
10.5 |
9.5 |
8.5 |
7.75 |
7.0 |
6.0 |
5.5 |
4.75 |
11.25 |
10.0 |
9.0 |
8.0 |
7.25 |
6.25 |
5.75 |
5.0 |
11.75 |
10.5 |
9.5 |
8.5 |
7.75 |
6.5 |
6.0 |
5.25 |
12.5 |
11.25 |
10.0 |
9.0 |
8.0 |
7.0 |
6.25 |
5.5 |
13.0 |
11.75 |
10.5 |
9.5 |
8.5 |
7.25 |
6.5 |
5.75 |
13.75 |
12.25 |
11.0 |
10.0 |
9.0 |
7.5 |
6.75 |
6.0 |
14.25 |
12.75 |
11.5 |
10.5 |
9.25 |
8.0 |
7.25 |
6.25 |
14.75 |
13.25 |
12.0 |
10.75 |
9.75 |
8.25 |
7.5 |
6.5 |
15.25 |
13.75 |
12.5 |
11.25 |
10.0 |
8.75 |
8.0 |
7.0 |
16.0 |
14.5 |
13.0 |
11.75 |
10.5 |
9.0 |
8.25 |
7.0 |
16.75 |
15.0 |
13.5 |
12.0 |
11.0 |
9.25 |
8.5 |
7.25 |
17.25 |
15.5 |
14.0 |
12.5 |
11.25 |
9.75 |
9.0 |
7.75 |
17.75 |
16.0 |
14.5 |
13.0 |
11.75 |
10.0 |
9.0 |
7.75 |
18.5 |
16.75 |
15.0 |
13.5 |
12.25 |
10.5 |
9.5 |
8.0 |
19.25 |
17.25 |
15.5 |
14.0 |
12.75 |
10.75 |
9.75 |
8.25 |
19.75 |
17.75 |
16.0 |
14.5 |
13.0 |
11.0 |
10.0 |
8.5 |
20.5 |
18.5 |
16.5 |
14.75 |
13.5 |
11.5 |
10.25 |
8.75 |
21.0 |
19.0 |
17.0 |
15.25 |
13.75 |
11.75 |
10.5 |
9.0 |
21.75 |
19.5 |
17.5 |
15.75 |
14.25 |
12.0 |
10.75 |
9.25 |
22.25 |
20.0 |
18.0 |
16.25 |
14.5 |
12.5 |
11.25 |
9.75 |
22.75 |
20.5 |
18.5 |
16.75 |
15.0 |
12.75 |
11.5 |
9.75 |
23.5 |
21.0 |
19.0 |
17.25 |
15.5 |
13.25 |
12.0 |
10.25 |
24.25 |
21.75 |
19.5 |
17.5 |
16.0 |
13.5 |
12.25 |
10.5 |
24.75 |
22.25 |
20.0 |
18.0 |
16.25 |
13.75 |
12.5 |
10.75 |
25.25 |
22.75 |
20.5 |
18.5 |
16.75 |
14.25 |
12.75 |
11.0 |
26.0 |
23.5 |
21.0 |
19.0 |
17.0 |
14.5 |
13.0 |
11.25 |
26.5 |
23.75 |
21.5 |
19.5 |
17.5 |
15.0 |
13.5 |
11.5 |
27.25 |
24.5 |
22.0 |
19.75 |
17.75 |
15.25 |
13.75 |
11.75 |
27.75 |
25.0 |
22.5 |
20.25 |
18.25 |
15.5 |
14.0 |
12.0 |
28.25 |
25.5 |
23.0 |
20.75 |
18.75 |
16.0 |
14.5 |
12.5 |
28.75 |
26.0 |
23.5 |
21.0 |
19.0 |
16.25 |
14.75 |
12.75 |
29.75 |
26.75 |
24.0 |
21.75 |
19.5 |
16.75 |
15.0 |
13.0 |
30.25 |
27.25 |
24.5 |
22.0 |
19.75 |
17.0 |
15.25 |
13.0 |
30.75 |
27.75 |
25.0 |
22.5 |
20.25 |
17.25 |
15.5 |
13.25 |