What Font grade is B1 at Block'Out Nantes?

B1 at Block'Out Nantes is 4+, about V0–V0+ in V-scale.

What Font grade is B2 at Block'Out Nantes?

B2 at Block'Out Nantes is 5A, about V1 in V-scale.

What Font grade is B3 at Block'Out Nantes?

B3 at Block'Out Nantes is 5B–5C, about V1–V2 in V-scale.

What Font grade is B4 at Block'Out Nantes?

B4 at Block'Out Nantes is 6A, about V3 in V-scale.

What Font grade is B5 at Block'Out Nantes?

B5 at Block'Out Nantes is 6A+, about V3–V4 in V-scale.

What Font grade is B6 at Block'Out Nantes?

B6 at Block'Out Nantes is 6B, about V4 in V-scale.

Climbing gym · Nantes, France

Block'Out Nantes grades, explained

Opened in July 2018. It has 2,000 m² with 800 m² of climbing surface: about 200 boulders on 28 wall profiles, reset every three to four weeks, plus an outdoor bouldering area with five sectors that opens in summer. It also has a restaurant, fitness room, hammam, sauna and an osteopath. Buses 81 and C20 stop at Janvraie, a minute away; tram 1 (Lauriers) is 15 minutes on foot.

Day passes Gym website Directions Day pass €17 · hours and prices below

Bouldering grades

Block'Out uses its own numbered scale, B1 (easiest) to B14, instead of grading by hold colour. Block'Out does not publish Font equivalents. Third-party sources agree that, above about 5C, each B step is roughly one Font step, but they differ on where the scale starts. The levels below follow Kaskad Coaching's table (2026); each level's note gives an older forum mapping (2016).

Level	Font	≈ V-scale
B1An older (2016) forum mapping: 4.	4+	V0–V0+
B2An older (2016) forum mapping: 4+.	5A	V1
B3An older (2016) forum mapping: 5.	5B–5C	V1–V2
B4An older (2016) forum mapping: 5+.	6A	V3
B5An older (2016) forum mapping: 6A.	6A+	V3–V4
B6An older (2016) forum mapping: 6B.	6B	V4
B7An older (2016) forum mapping: 6C.	6B+	V4
B8An older (2016) forum mapping: 7A.	6C	V5
B9An older (2016) forum mapping: 7A+.	6C+	V5–V6
B10An older (2016) forum mapping: 7B.	7A	V6
B11An older (2016) forum mapping: 7B+.	7A+	V7
B12An older (2016) forum mapping: 7C.	7B	V7–V8
B13An older (2016) forum mapping: 7C+.	7B+	V8
B14An older (2016) forum mapping: 8A.	7C	V9

Block'Out grades the same way at all 13 of its gyms. All Block'Out gyms and grades

From climbers' descriptions and photos of the gym's grade boards. Gyms reset and regrade often, and grades vary between setters, so treat this as a guide and check the boards when you visit.

Visiting Block'Out Nantes

Address: 27 boulevard Bâtonnier Cholet, 44100 Nantes, FranceGoogle Maps Apple Maps OpenStreetMap
Booking: Walk in: no booking neededNo booking needed: open climbing is unlimited in time during opening hours. Single sessions and multi-visit books can also be bought online.Day passes
Prices: Day pass · adult €17
Day pass · concessionclimbing-club licence holders, school and university students, jobseekers, CEZAM and Carte Blanche holders €15
Day pass · childunder 10 €11
Off-peak entry · adultHappy hour: weekdays before 16:00 or after 21:30; weekends and holidays after 19:00 €15
10-visit pass · adultvalid at Block'Out Nantes only; mandatory lifetime card +€6; reduced rate €120 €140
10-visit pass · adultHappy hour only (weekdays before 16:00 or after 21:30; weekends and holidays after 19:00); mandatory lifetime card +€6 €120
Monthly · adultPass France, valid at all Block'Out gyms; 12-month commitment (then rolling), set-up fee waived; reduced rate €44. Without commitment: €54/month plus a one-off set-up fee (the page gives €40–50) and notice period. €49
Monthly · adultHappy-hour-only pass (weekdays before 16:00 or after 21:30; weekends and holidays after 19:00); same 12-month commitment terms €36
Shoe hire €5
Reduced and under-10 rates shown on the page's price table; the mandatory lifetime card applies to 10-visit cards.All prices on the gym's site
Opening hours: Mon–Fri 11:00–23:00
Sat–Sun 09:00–21:00
Public holidays 09:00–21:00
The page also lists shorter weekend hours (09:00–19:00) valid only until 23 August; regular hours shown.Hours on the gym's site
First visit: What to know before your first visit
Phone: +33 2 40 92 88 62
Photos: Instagram Photos on Google Maps

Day pass · adult	€17
Day pass · concessionclimbing-club licence holders, school and university students, jobseekers, CEZAM and Carte Blanche holders	€15
Day pass · childunder 10	€11
Off-peak entry · adultHappy hour: weekdays before 16:00 or after 21:30; weekends and holidays after 19:00	€15
10-visit pass · adultvalid at Block'Out Nantes only; mandatory lifetime card +€6; reduced rate €120	€140
10-visit pass · adultHappy hour only (weekdays before 16:00 or after 21:30; weekends and holidays after 19:00); mandatory lifetime card +€6	€120
Monthly · adultPass France, valid at all Block'Out gyms; 12-month commitment (then rolling), set-up fee waived; reduced rate €44. Without commitment: €54/month plus a one-off set-up fee (the page gives €40–50) and notice period.	€49
Monthly · adultHappy-hour-only pass (weekdays before 16:00 or after 21:30; weekends and holidays after 19:00); same 12-month commitment terms	€36
Shoe hire	€5

Mon–Fri	11:00–23:00
Sat–Sun	09:00–21:00
Public holidays	09:00–21:00

Instagram

Hours and prices from the gym's own website, checked 3 October 2026. They change, so check before you go.

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Questions

What Font grade is B1 at Block'Out Nantes?: B1 at Block'Out Nantes is 4+, about V0–V0+ in V-scale.
What Font grade is B2 at Block'Out Nantes?: B2 at Block'Out Nantes is 5A, about V1 in V-scale.
What Font grade is B3 at Block'Out Nantes?: B3 at Block'Out Nantes is 5B–5C, about V1–V2 in V-scale.
What Font grade is B4 at Block'Out Nantes?: B4 at Block'Out Nantes is 6A, about V3 in V-scale.
What Font grade is B5 at Block'Out Nantes?: B5 at Block'Out Nantes is 6A+, about V3–V4 in V-scale.
What Font grade is B6 at Block'Out Nantes?: B6 at Block'Out Nantes is 6B, about V4 in V-scale.

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Other Block'Out gyms

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Sources

Checked 3 October 2026. Gear Loop isn't affiliated with Block'Out Nantes.