Measure the inside of an empty grid cell in your ceiling. If you get about 60 centimeters, you need a 60x60 panel. If you get 62 or 62.5, a 62x62. A 60x60 panel in the wider grid drops in loose and sags crooked.
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Why there are two sizes
A suspended ceiling is a grid of T-profiles with tiles lying in it. That grid comes in two common sizes: 600 by 600 millimeters, and 625 by 625. The first is the current standard; the second you mainly find in offices and schools built in the 1980s and 1990s.
The panels are slightly smaller than the cell: a 60x60 panel measures about 595 by 595 millimeters, so it drops in and rests on the profiles. A 62x62 does the same in the wider grid.
How to measure
Lift one ceiling tile and measure the inside of the cell, from profile to profile. Do not measure the tile itself: its edges are often rounded or damaged, which puts you a few millimeters out.
Also measure two cells in different places in the room. In buildings that have been renovated, part of the ceiling sometimes sits in a different grid from the rest.
What we carry in both sizes
In 60x60 there is a choice. The Vesta gives 4050 lumens from 30 watts and comes dimmable and non-dimmable. The Pura is the most efficient at 4250 lumens from 25 watts, or 170 lumens per watt, and is IP44 as well. The Quadra is the louvre panel with a UGR below 16, for places where people sit underneath for hours.
In 62x62 there are two: the Vesta 62x62 with 4200 lumens from 30 watts and IP44, and the Mira 62x62 with 4000 lumens from 40 watts, the budget version without a switch.
When in doubt: what not to do
Filling out a panel that is too small with strips or tape does not work. The panel then rests not on the profiles but on the filler, and sags crooked over time anyway. And you can see the seam.
Cutting down a panel that is too big is out of the question: the housing is the structure and the LEDs run right to the edge.
If you are torn between the two, measure again and go by the inside dimension of the cell, not by what is stamped on the old fixture.
Also mind the weight and the load capacity
A mineral wool ceiling tile weighs little; a 60 by 60 centimeter LED panel weighs a few kilos. For a sound grid that is no problem, but in an old ceiling with sagging or rusted profiles it is.
So before you order, walk past the cells where the panels will go and gently push a profile up. If it springs back, it is fine. If it feels slack or you see rust at the hanger wires, you are better off hanging the panel separately from the structure above rather than letting it rest in the grid.
Panels with a 3-core cable are wired permanently to the ceiling point by an electrician. With the Euro plug version you need a socket above the ceiling. When replacing, that is often the reason to choose the same variant as what was there.
And if your ceiling has no grid
Then you do not lay the panel in, but hang or mount it. That is what a surface-mounting frame is for: the panel clicks into it so it sits against the ceiling as a neat block. Which situation calls for which solution is in How do you mount an LED panel?
If you are unsure about the format rather than the grid, Which size LED panel: 60x60 or 120x30? helps. The full range is in LED panels.
How do I know whether I need a 60x60 or a 62x62 panel?
Lift a ceiling tile and measure the inside of the cell from profile to profile. About 60 centimeters means a 60x60 panel; 62 or 62.5 centimeters means a 62x62.
Does a 60x60 panel fit a 62x62 suspended ceiling?
No. It drops in loose, does not rest properly on the profiles and sags crooked. Filling with strips does not solve that, because then the filler carries it instead of the profile.
Where do you find the 62x62 grid?
Mainly in offices and schools from the 1980s and 1990s. New builds almost always use 60x60. In renovated buildings both grids can occur in one building, so measure in two places.