Grandmother vs grandfather vs granddaughter clocks

All three are longcase (floor) clocks; the difference is size. Antique dealer Westland London gives typical heights of 6 to 8 ft (1.8 to 2.4 m) for a grandfather clock, 5 to 6 ft (1.5 to 1.8 m) for a grandmother clock and 3 to 5 ft (0.9 to 1.5 m) for a granddaughter clock. These are informal names, not a standard, and other sources draw the lines differently.

Key facts

"Grandmother clock" sounds like a different kind of clock, but it's a family name. A grandfather clock, a grandmother clock and a granddaughter clock are all longcase clocks: free-standing floor clocks with a tall case that holds a pendulum and, usually, weights. What changes is the height, the width and sometimes the movement.

Grandfather vs grandmother vs granddaughter: heights compared

Sources don't agree exactly, so here is what each one says. Use these as rough guides, not rules.

Because the names are informal, a 6-foot clock could be sold as either a grandfather or a grandmother clock. Proportions matter as much as height: grandmother clocks are usually slimmer and lighter-looking, as well as shorter.

Longcase, tall-case, floor clock: what's the difference?

None, really. Longcase clock is the traditional British term and the one collectors and museums use. Americans often say tall-case clock. Floor clock and hall clock are general names that include all sizes, and modern retailers often use "floor clock" for both mechanical and quartz models. "Grandfather clock" is the popular name. The Oxford English Dictionary credits Henry Clay Work's 1876 song "My Grandfather's Clock" for it, as do Britannica and most histories; "grandmother" and "granddaughter" followed as playful names for the smaller sizes.

Grandmother clocks

A grandmother clock is a scaled-down longcase clock. Westland London explains that the smaller size developed as people wanted traditional floor clocks that would fit into smaller homes. A true grandmother clock still has a pendulum and weights, but with a more compact case, often a shorter pendulum, and sometimes a spring-driven or quartz movement. Many have the same chime choices as full-size clocks (see clock chimes).

Granddaughter clocks

A granddaughter clock is smaller again: Westland gives 3 to 5 feet. At that size some stand on the floor and some on a low table or chest. Westland notes that some granddaughter clocks use a quartz movement instead of a pendulum. Very small longcase-style clocks are sometimes called "grandchild" or "miniature" longcase clocks.

A short history of the longcase clock

The longcase clock exists because of two inventions: the pendulum clock (Christiaan Huygens, 1656) and the anchor escapement, which let a long pendulum swing through a small arc and keep excellent time. A long pendulum and heavy weights needed protecting, so English clockmakers built a tall wooden case around them. London clockmaker William Clement is usually credited with developing the form around 1670 to 1680. The Science Museum in London holds a month-going longcase clock made in London around 1680. Britannica adds that the floor-standing case may have developed partly to support heavier mechanisms that had been hung on walls. For more, see who invented the grandfather clock and the invention of the mechanical clock.

How to tell which clock you have

1. Measure the height from the floor to the top of the case, excluding finials if you want a like-for-like comparison with listings.
2. Look inside. Count the weights: one weight usually means time-only (or a 30-hour clock), two means time and strike, three means time, strike and chime.
3. Check the pendulum length. A full-size grandfather clock usually has a pendulum of about a metre that takes a second per swing; smaller clocks have shorter, faster pendulums.
4. Look for a battery compartment. Some modern floor clocks are quartz, sometimes with a decorative pendulum.
5. Find the maker. Names appear on the dial, the movement's back plate or a label inside the case. See clock brands explained.

Choosing a floor clock for your home

• Ceiling and doorways: measure both, including the crown or finials, and the route the clock must take into the room.
• Floor: a floor clock needs a solid, level floor. Thick carpet makes them rock; the levelling feet help.
• Space in front: you need room to open the door to wind it and reach the weights.
• Movement: mechanical clocks need weekly winding and periodic servicing; quartz floor clocks need batteries. See battery clocks and clock repair.
• Sound: a full-size chiming clock is loud in a small room. Look for a volume control, chime selector and night shut-off.

Sources

• Westland London: grandmother vs grandfather clocks
• Britannica: Grandfather clock
• Wikipedia: Grandfather clock
• Science Museum Group: month-going longcase clock, London, c. 1680

Last updated November 6, 2026. Found an error? Tell us.

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• Clock chimes
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